National Weather Service: Modernization Activities Affecting Northwestern Pennsylvania
Released: 1997-10-06T00:00:00

Letter

Scope and Methodology

To determine why the Erie WSO was spun down before completion of the Secretary of Commerce’s report on 32 areas of concern, we analyzed documents that described the spin-down and reviewed the Secretary’s report. We also discussed the timeline of these events with NWS officials.

To determine what weather services were provided before and after the Erie office was spun down, we reviewed NWS site implementation plans for the Cleveland, Pittsburgh, and Central Pennsylvania weather offices, and interviewed former employees of the Erie WSO and officials at each of the three WFOs. We also discussed the services provided and concerns raised about the quality and types of services with (1) members of Save Our Station, a group dedicated to saving the Erie WSO, (2) Erie television station meteorologists, (3) the National Air Traffic Controllers Association safety representative at Erie International Airport, (4) officials at Presque Isle State Park, Erie, (5) the officer in charge of the U.S. Coast Guard Station in Erie, and (6) emergency management officials and representatives of emergency volunteer organizations, such as Skywarn, in each of the nine counties that constituted the Erie WSO warning area. We reviewed NWS’ responses to concerns raised.

We identified safety concerns raised regarding the weather services provided at the Erie airport and obtained NWS’ responses to these concerns through interviews with the National Air Traffic Controllers Association safety representative at Erie International Airport, the manager of the Aviation Weather Requirements Division, the Federal Aviation Administration (FAA), and NWS officials. To identify concerns raised about small-craft advisories on Lake Erie, we interviewed (1) officials at Presque Isle State Park, (2) the officer in charge of the U.S. Coast Guard station in Erie, (3) the commander of the Greater Erie Boating Association, and (4) members of Save Our Station. We reviewed NWS documents relating to aviation weather and the small-craft advisories on Lake Erie and obtained NWS’ responses to safety concerns.

To determine if reliable statistical or other evidence existed that addressed degradation of service, we reviewed NWS verification statistics for severe weather events in the nine counties included in the Erie WSO county warning area prior to and after spin-down of the Erie office. We discussed the methodology and process used to develop these statistics, and their reliability, with NWS officials. In addition, we discussed NWS verification statistics and studies with a professor emeritus and an associate professor of meteorology at Pennsylvania State University and also with the chairperson of the Modernization Transition Committee. Further, we reviewed available NWS lake-effect snow study reports. We interviewed the NWS Eastern region team responsible for the lake-effect snow study and the director of the Office of Meteorology at NWS headquarters. In discussions with representatives of Save Our Station, county emergency management directors, and volunteer organizations, we obtained specific examples of weather events that these individuals believed demonstrated evidence of degradation of service.

In addition, we reviewed the National Research Council (NRC) report on NWS modernization and the Secretary’s report on 32 areas of concern, with specific reference to radar coverage. To understand the ability of NWS’ new radars and other data tools available to forecasters to provide adequate coverage for severe weather event warnings and lake-effect snow, we discussed this topic with NWS officials and the study director of NRC, the chairperson of the Modernization Transition Committee, a member of the Secretary’s report team who was the acknowledged expert on NWS radar, the former chairperson of NRC’s Modernization Committee (who is also a professor emeritus of meteorology), and an associate professor of meteorology at Pennsylvania State University.

We performed our work at NWS headquarters in Silver Spring, Maryland; at the NWS Eastern region in Bohemia, New York; at the Cleveland, Pittsburgh, and Central Pennsylvania WFOs; and at the Erie WSO. In addition, we conducted telephone interviews with emergency management officials and emergency volunteers in the Erie WSO county warning area.

We performed our work from April to August 1997, in accordance with generally accepted government auditing standards. As agreed with your offices, we did not assess the adequacy of the NWS responses to identified concerns, and we did not assess the adequacy of reports discussed in this report. The Secretary of Commerce provided written comments on a draft of this report. These comments are discussed at the end of this report and are reprinted in appendix II.

Background

NWS began a nationwide modernization program in the 1980s to upgrade observing systems, such as satellites and radars, and design and develop advanced forecaster computer workstations. The goals of the modernization are to achieve more uniform weather services across the nation, improve forecasts, provide better detection and prediction of severe weather and flooding, permit more cost-effective operations through staff and office reductions, and achieve higher productivity. As part of its modernization program, NWS plans to shift its field office structure from 52 Weather Service Forecast Offices and 204 WSOs, to one with 119 WFOs.

NWS field offices provide basic weather services such as forecasts, severe weather warnings, warning preparedness, and—where applicable—aviation and marine forecasts. Warnings include “short-fused”—events such as tornadoes, flash floods, and severe storms—and “long-fused”—events such as gales and heavy snow. NWS broadcasts forecasts and warnings over the National Oceanic and Atmospheric Administration’s (NOAA) Weather Radio. NWS offices transmit hourly weather updates and severe weather warnings as they are issued on hundreds of NOAA Weather Radio stations around the country. Warning preparedness includes coordinating with local emergency management, law enforcement agencies, and the media on notification of and response to severe weather events, and training volunteer weather observers to collect and report data under a program commonly called Skywarn. NWS relies heavily on supplemental data provided by Skywarn volunteers’ reports on severe weather events.

Under NWS’ restructuring plan, the Erie WSO is slated for closure and has been spun down operationally. When fully functioning, this office’s primary role was to provide severe weather warnings to nine counties in northwestern Pennsylvania, operate an on-site radar, and take surface-condition weather observations. Under the NWS field office restructuring, responsibility for Erie’s nine counties is divided among three WFOs: Erie and Crawford counties are served by the Cleveland WFO; Venango and Forest counties are served by the Pittsburgh WFO; and Cameron, Elk, McKean, Potter, and Warren counties are served by the Central Pennsylvania WFO (located at State College, Pennsylvania).Figures 1 and 2 present maps of the premodernized and modernized office structures for the northwestern Pennsylvania area.

Under the field office restructuring, the three offices assuming coverage responsibility for Erie’s nine counties have been in the process of installing new systems and equipment, such as new radars, and training staff in using the new technologies. In addition, each office taking on part of Erie’s former responsibilities communicated modernization and restructuring changes with the newly-assumed counties’ emergency response community, volunteer weather observers, the media, and the public. Once sufficient systems and staff were in place, the three WFOs—Cleveland, Pittsburgh, and Central Pennsylvania—began assuming responsibility for their respective counties. Erie gradually phased out its routine radar operation; it was responsible for augmenting ASOS until October 1996 when FAA took over responsibility for this function.

Two other NWS changes affected the Erie area, but were not part of the spin-down or required for consideration in making an office closure certification; these changes affected the number and type of forecasts issued and the area covered by the forecasts. First, in both the premodernized and modernized environments, the 2-day forecast is broken into four 12-hour periods. However, with access to improved, real-time data from new technology—primarily the new radars implemented as part of the modernization—NWS in 1994 added a short-term forecast, called the Nowcast, which is a 6-hour forecast.

The second change NWS implemented during modernization was a reduction in the area covered by its zone forecast. Before modernization, forecast zones (i.e., the areas for which a particular forecast was issued) could include several counties as well as specific localized forecasts for high-population areas. In October 1993, NWS reduced the size of its zones to single counties to allow forecasters to take advantage of improved data and make more specific forecasts and warnings. Because of this ability to be more specific, most NWS areas discontinued the localized forecasts for high-population areas.

The Weather Service Modernization Act requires that before any office may be closed, the Secretary of Commerce must certify to the Congress that closing the field office will not degrade service to the affected area. This certification must include (1) a description of local weather characteristics and weather-related concerns that affect the weather services provided within the service area, (2) a detailed comparison of the services provided within the service area and the services to be provided after such action, (3) a description of recent or expected modernization of NWS operations that will enhance services in the area, (4) identification of areas within a state that will not receive coverage (at an elevation of 10,000 feet or below) by the modernized radar network, (5) evidence, based upon a demonstration of modernized NWS operations, used to conclude that services will not be degraded from such action, and (6) any report of the Modernization Transition Committee that evaluates the proposed certification.

In response to concerns from members of the Congress, the Department of Commerce agreed to take several steps to identify community concerns regarding modernization changes, such as office closures, and study the potential for degradation of service. First, the Department published a notice in the Federal Register in November 1994, requesting comments on service areas where it was believed that premodernized weather services may be degraded with planned modernization changes. Next, the Department contracted with NRC to conduct an independent scientific assessment of proposed modernized radar coverage and consolidation of field offices in terms of the no degradation of service requirement. In addition, NRC established criteria for identifying service areas where the elimination of older radars could degrade services. Finally, the Secretary of Commerce applied the NRC criteria to identified areas of concern to determine whether a degradation of service is likely to occur. The resulting report, Secretary’s Report to Congress on Adequacy of NEXRAD Coverage and Degradation of Weather Services Under National Weather Service Modernization for 32 Areas of Concern, was issued in October 1995.

Erie Spin-Down Began Prior to Initiation of Commerce Review

NWS started spinning down the Erie WSO by transferring warning responsibilities to the three assuming WFOs in August 1994 before the Department of Commerce began its review of areas of concern. However, Erie community members raised questions in June 1994, several months before Erie was identified as one of the areas of concern through the Federal Register process. NWS continued with its plans to spin down the office because officials believed they would be providing the best service to the area by relying on modernized radars in other offices. Erie continued surface observations and radar operations until October 1996 and March 1997, respectively.

The starting point for the Department of Commerce study of areas of concern was the November 1994 Federal Register announcement soliciting concerns about NWS modernization and restructuring plans. In February 1995, Erie was identified as 1 of 32 areas of concern. The Department of Commerce reviewed the 32 areas between June and August 1995, and issued its report in October 1995. The report concluded that with the exception of lake-effect snow, the assuming WFOs will be able to detect severe weather phenomena over northwestern Pennsylvania. In addition, the report recommended that NWS (1) compare the adequacy of the assuming WFOs’ new radars and other data sources with Erie’s old radar in identifying lake-effect snow over a 2-year period and (2) transmit data from Erie’s radar to nearby WFOs to support the lake-effect snow study and facilitate the continued spin-down of the Erie office.

Types of NWS Services Provided Before and After Spin-Down Are Generally the Same, but Concerns Exist Regarding NWS’ Ability to Serve Distant Areas

The three weather offices that assumed responsibility for the counties formerly served by the Erie WSO provide generally the same types of services that the Erie office had provided, with the exception of the general public’s local or toll-free telephone access to NWS personnel. The general public in the nine counties must now call long-distance to contact the Cleveland, Central Pennsylvania, and Pittsburgh WFOs.

Services for Erie and Crawford counties are now provided entirely by the Cleveland WFO. There are few changes to the services that were provided by the Erie WSO. The primary changes are the discontinuance of the localized forecast for the city of Erie and the addition of the Nowcast. As noted before, localized forecasts were discontinued because of changes in the size and detail of zone forecasts. Another significant change is the transfer of ASOS augmentation to FAA. This relieves NWS of maintaining staff on-site to take observations. Table 1 presents a detailed comparison of the services provided to Erie and Crawford counties before and after spin-down.

The Pittsburgh WFO now provides all services to Venango and Forest counties with the exception of issuing NOAA weather radio reports and updates. Changes in services to these counties are minimal as Pittsburgh was already providing many services to these areas. The only significant change is the addition of the short-term forecast—the Nowcast—which was not provided in premodernization. Table 2 presents a detailed comparison of services provided before and after spin-down.

Services for Cameron, Elk, McKean, Potter, and Warren counties are now provided mostly by the Central Pennsylvania WFO. Since this office is not yet fully staffed, forecasting and long-fused warning services are still provided by Pittsburgh. Again, with the exception of the Nowcast, no major changes have occurred for these counties. Since many of these counties are mountainous, NOAA Weather Radio service does not reach all areas. NWS believes service will be improved when additional transmitters are installed in fiscal year 1998. The Central Pennsylvania and Pittsburgh WFOs will program these transmitters. Table 3 presents a detailed comparison of services provided before and after spin-down.

Concerns Raised About Services to Erie and Crawford Counties and NWS Responses

Many concerns have been raised about the specific services being provided by NWS as well as the quality of the service provided. Most concerns had been brought to NWS’ attention and NWS provided responses to them. Other concerns brought to our attention either had not been reported to NWS or NWS had not officially responded. We discussed these concerns with NWS officials and received their responses. The most common concern—voiced by almost every individual we spoke with—was with the ability of distant radars to detect all types of weather phenomena. Table 4 presents concerns raised by users in Erie and Crawford counties and NWS’ responses.

Concerns Raised About Services to Cameron, Elk, Forest, McKean, Potter, Venango, and Warren Counties and NWS Responses

The primary concern voiced from five of the seven counties now served by the Central Pennsylvania and Pittsburgh WFOs was the ability of distant radars to provide adequate coverage for severe weather phenomena in order to issue accurate and timely forecasts and warnings. Some users in counties at the fringes of radar coverage questioned NWS’ ability to track approaching severe weather outside the range of an office’s radar. NWS’ responses to these concerns were to assure county officials and residents that the new radars and other components of the modernization, such as satellites and improved weather models, would enable NWS to provide better service to their areas. Furthermore, WFOs can access radar data from nearby WFOs. For example, if a severe storm was moving eastward into northwestern Pennsylvania, Central Pennsylvania and Pittsburgh staff would likely access data from Cleveland’s radar to help determine the path and intensity of the event.

One individual expressed concern that during severe weather events, there may not be sufficient staff to operate the amateur radio equipment, which is used to communicate with Skywarn volunteers. According to NWS, there are licensed amateur radio operators on staff. However, if licensed staff are not available during severe events, NWS can call on volunteers to help operate the equipment. These concerns seemed to have been allayed as most officials told us that service provided by the new offices is at least equal to the service provided before modernization.

Concerns About Services at the Erie Airport and Timeliness of Lake Erie Small-Craft Advisories

A few concerns have been raised regarding weather services provided at the Erie International Airport and the timeliness of small-craft advisories for Lake Erie. The most commonly cited concern was with ASOS, which has been the subject of much scrutiny since its nationwide deployment. We reported on several ASOS issues in 1995, such as specific sensor problems and the system’s difficulty reporting actual, prevailing conditions in rapidly changing or patchy weather conditions. NWS has implemented modifications to address sensor problems and, in some places, including Erie, added sensors to better report representative observations. In addition, since ASOS does not replace all human observations, human observers must continue to take manual observations at airports such as Erie to supplement the system (this process is called augmentation) and correct the system when it is not accurately reporting current conditions.

Under an NWS/FAA interagency agreement, FAA accepted augmentation responsibility for the Erie ASOS in October 1996. At that point, NWS weather observers were discontinued at Erie and air traffic controllers became responsible for augmenting ASOS observations and correcting the system when it reported inaccurate conditions. Concerns surround the issue of whether this ASOS augmentation responsibility is too much for air traffic controllers. FAA recognizes these concerns and has sponsored an independent study of the impact of ASOS augmentation. According to the manager of FAA’s Aviation Weather Requirements Division, a report is expected in the fall of 1997. Table 5 presents specific safety concerns raised and NWS responses.

No Evidence of Service Degradation, but Detection of Lake-Effect Snow Remains a Concern

There are several sources of evidence that address whether a degradation of service has occurred in the Erie area. NWS’ statistical verification program collects performance data on the issuance of forecasts and warnings and provides information necessary to compare “premodernized” and “modernized” performance. Overall, data for the former nine-county Erie WSO area show an improvement in service under the three WFOs.

Studies by NRC and the Department of Commerce analyzed the ability of the new radars and other components of the modernization to detect certain weather phenomena and assessed the potential for degradation of weather services in the Erie area. NRC concluded that the ability to detect three severe weather phenomena, including lake-effect snow, was questionable. The Department of Commerce’s study expanded on NRC’s work and concluded that lake-effect snow was the only phenomena that remained a concern. NWS is completing a 3-year study of its ability to detect and predict lake-effect snow in the Great Lakes area, which includes northwestern Pennsylvania.

Accuracy and Timeliness of Warnings and Forecasts Show Overall Improvement

Since the 1980s, NWS has assessed the accuracy and timeliness of its severe weather warnings and public and aviation forecasts through a statistical verification program. The verification process includes determining the accuracy of the forecast elements of maximum and minimum temperature and probability of precipitation. Several elements of the aviation forecasts are likewise verified. Severe weather warnings are verified by determining whether an event for which a warning was issued occurred. The elements calculated for warning verification are probability of detection (i.e., NWS’ ability to detect weather events—the higher the probability, the better the performance), false alarm rate, and lead time. If a warning was issued but a severe weather event did not occur, a higher false alarm rate results. If a severe weather event occurred without a warning, the probability of detection goes down.

Warning and forecast verification statistics historically have been used to help weather office managers determine trends in performance and identify areas needing improvement. With modernization, the statistics are included in the certification package as support either for or against a determination of degradation of service. NWS officials stressed, however, that verification statistics are not the most important component of the no-degradation assessment. Rather, they said, they rely most heavily on feedback from users to determine satisfaction with the level of service being provided and whether degradation has occurred.

The verification statistics for the nine former Erie office counties show an overall improvement to the area in warning service. Appendix I presents the warning verification data for the nine-county area. The statistics also show slight improvement for public forecast service. The aviation forecast verification statistics show a negligible decline from .33 to .32, on a scale from 0 to 1 with 1 being the best performance.

NWS officials cautioned that there are limitations to the verification program and resulting data. For example, since the number and type of weather events vary from year to year, it is impossible to directly compare performance from one year to another. In addition, it is more difficult to verify events in sparsely populated areas. Finally, NWS officials acknowledged that severe weather warning verification procedures vary across offices.

NRC Concluded That New Radars May Miss Three Key Weather Phenomena

In August 1994, the Department of Commerce contracted with NRC to study NWS’ modernized radar network coverage and identify any gaps that could result in a degradation of weather service. In addition, NRC was to develop criteria for the Department to use in determining the potential for degradation of service in those areas of concern identified through the public comment process.

In June 1995, NRC issued its report, Toward a New National Weather Service: Assessment of NEXRAD Coverage and Associated Weather Services. Overall, NRC concluded that weather services on a national basis would be improved substantially under the new radar network. For example, compared with the old radar network, the modernized radar network will cover a much broader area of the contiguous United States and provide greater coverage for detecting specific severe weather phenomena, such as supercells, mini-supercells, and macrobursts. NRC also noted that the new radars are just one element in a composite weather system that includes satellites, automated surface observing equipment, wind profilers, improved numerical forecast models, and cooperative networks of human observers and spotters.

NRC cautioned, however, that at old radar sites where radar coverage is to be provided by a new radar some distance away, there is the potential for degradation in radar-detection coverage capability. In particular, northwestern Pennsylvania was one such area with degraded radar coverage for macrobursts, mini-supercells, and lake-effect snow. NRC recommended NWS study the area to determine whether the degraded radar coverage would result in a degradation of weather service. Figure 3 shows the approximate gap in radar coverage for lake-effect snow over northwestern Pennsylvania.

The Department of Commerce Concluded That New Radars May Miss Lake-Effect Snow

As agreed with concerned members of the Congress, the Department of Commerce used NRC’s criteria to evaluate the potential for degradation in the 32 areas identified via the Federal Register process and assessed the potential for degradation of service for the radar gaps identified in NRC’s report. The Secretary’s team conducted additional research into the capabilities of the new radars and found that the effective range of detection was greater than estimated by NRC. Specifically, the team concluded that the new radars serving the former Erie WSO area would be able to detect macrobursts and mini-supercells for northwestern Pennsylvania. It was still clear, however, that the radars could not adequately detect some lake-effect snow events in the Erie area. Therefore, the Secretary’s team recommended that NWS compare the adequacy of the assuming WFOs’ new radars and other data sources with Erie’s old radar in identifying lake-effect snow over a 2-year period to determine how well the composite weather system could help detect and predict lake-effect snow over the area in question. In addition, the report recommended that NWS keep the Erie radar (an older vintage) operational until the results of the study were compiled, which was done.

Degradation of Lake-Effect Snow Detection Not Evident, but Service Not as Good as Elsewhere Along the Great Lakes

NWS began a lake-effect snow study in November 1994, 1 year before the Secretary’s team recommended that a similar assessment be done. NWS initiated the study to improve its ability to detect and predict lake-effect snow, as well as in response to concerns raised by congressional staff and residents of northern Indiana and northwestern Pennsylvania; these areas were scheduled to lose old radars and, instead, receive coverage from more distant but modernized radars. The goal of the study was to find ways of improving the warning and forecast services associated with lake-effect snow events. In response to the Secretary’s team’s recommendation, however, another goal was added to this study—to determine whether lake-effect snow detection would be degraded over northwestern Pennsylvania, if the Erie radar and office were shut down.

Data on lake-effect snow were collected over the three winter seasons between 1994 and 1997. While the broad study area included all areas in New York, Pennsylvania, Ohio, and Indiana that experience lake-effect snow, a seven-county area was established surrounding Erie on which more specific analysis would be performed. After each winter season, a data report was issued by NWS.

These reports conclude that NWS has made significant progress in improving its ability to detect and forecast lake-effect snow, however, there are still questions about the level of this service being provided to northwestern Pennsylvania. For example, NWS’ Eastern Region reported that for about 35 percent of lake-effect snow events, the composite weather system will be insufficient to compensate for the degradation in radar coverage over northwestern Pennsylvania. In addition, this report stated that NWS is not able to provide detailed, short-term forecasts (Nowcasts) during lake-effect snow events like it can for other areas that have better radar coverage. The Eastern Region’s report and the director of NWS’ Office of Meteorology point out, however, that this problem does not constitute a degradation of service because the probability of detection for lake-effect snow in the seven-county study area has improved since 1993.

Even though degradation has not occurred, according to the Eastern Region report and the director, this level of service is still unacceptable because lake-effect snow is the Erie area’s most severe weather condition and the community does not receive the same level of service that other lake communities receive. As a result, the Eastern Region report recommended that a radar be installed to provide better coverage for this severe weather phenomenon in northwestern Pennsylvania. The director of the Office of Meteorology agrees with this recommendation, but points out that since data from this new radar would be transmitted to existing WFOs, an additional weather office is not needed in the Erie area.

NWS’ final report of the lake-effect snow study is expected this fall. Any conclusions and recommendations from the lake-effect snow study will be reviewed by the Secretary’s team, which will make recommendations to the Secretary regarding specific actions to be taken. Once the results of the lake-effect snow study are finalized and actions taken to address degradation concerns, if any, NWS officials told us they will pursue closure certification for the Erie office.

Agency Comments

In commenting on a draft of this report, the Department of Commerce took no exceptions to the information presented and acknowledged that we had conducted thorough work in researching the issues and preparing the report. The Department reiterated that, after NOAA presents the Secretary’s team with the results of the lake-effect snow study, it will review and evaluate the findings, conclusions, and recommendations and determine the need for a radar in northwestern Pennsylvania. The Department’s written response is reprinted in appendix II.

As agreed with your offices, unless you publicly announce the contents of this report earlier, we will not distribute it until 10 days from the date of this letter. At that time we will send copies to the Ranking Minority Member, House Committee on Science, and the Chairmen and Ranking Minority Members of the Senate Committee on Commerce, Science, and Transportation; House and Senate Committees on Appropriations; House Committee on Government Reform and Oversight; and Senate Committee on Governmental Affairs; and to the Director, Office of Management and Budget. We are also sending copies to Senators Arlen Specter and Rick Santorum; Congressman John Peterson; the Secretary of Commerce; the Administrator, National Oceanic and Atmospheric Administration; and the Acting Director of the National Weather Service. Copies will be made available to others upon request.

Please contact me at (202) 512-6408 if you or your staffs have any questions concerning this report. I can also be reached by e-mail at willemssenj.aimd@gao.gov. Major contributors to this report are listed in appendix III.

Warning Verification Data for Erie’s Nine-County Area

Lead-time (minutes)

Lead-time (minutes)

Lead-time (minutes)

Comments From the Department of Commerce

Major Contributors to This Report

Accounting and Information Management Division, Washington, D.C.

Keith A. Rhodes, Technical Director Mark E. Heatwole, Assistant Director Patricia J. Macauley, Information Systems Analyst-in-Charge J. Michael Resser, Business Process Analyst Michael P. Fruitman, Communications Analyst The first copy of each GAO report and testimony is free. Additional copies are $2 each. Orders should be sent to the following address, accompanied by a check or money order made out to the Superintendent of Documents, when necessary. VISA and MasterCard credit cards are accepted, also. Orders for 100 or more copies to be mailed to a single address are discounted 25 percent.

U.S. General Accounting Office P.O. Box 37050 Washington, DC 20013 Room 1100 700 4th St. NW (corner of 4th and G Sts. NW) U.S. General Accounting Office Washington, DC Orders may also be placed by calling (202) 512-6000 or by using fax number (202) 512-6061, or TDD (202) 512-2537.

Each day, GAO issues a list of newly available reports and testimony. To receive facsimile copies of the daily list or any list from the past 30 days, please call (202) 512-6000 using a touchtone phone. A recorded menu will provide information on how to obtain these lists.