The following events were reported: Flash Flood, Flood. These occurred near station USW00013739, approximately 23.1722 km away, between 2011-09-06 14:07:00 and 2011-09-10 16:30:00. The flood was caused by Heavy Rain. The events resulted in 0 injuries and 1 fatalities. No significant property or crop damage was reported. Episode Narrative: The remnants of Tropical Storm Lee that interacted with a stalled frontal boundary produced several days with periods of heavy rain across Eastern Pennsylvania from the 5th into the 8th. Event precipitation totals averaged 4 to 9 inches, except in Berks County where 6 to 12 inches fell. One drowning occurred in Philadelphia. The heavy rain caused widespread poor drainage flooding as well as moderate flooding along the Delaware and Schuylkill Basins and minor to moderate flooding along the Lehigh River Basin. Crests in the upper Schuylkill, Lehigh and Delaware River Basins were higher than what occurred with Irene the previous month and the highest crests since late June of 2006 in most instances. The crests along the Delaware River were 2 to 4 feet higher than what occurred during Irene. Some of the smaller streams in southeastern Pennsylvania reached major flooding levels, but most of those crests were lower than what occurred with Irene. In addition to the freshwater flooding, moderate tidal flooding occurred along the lower Delaware River and its tributaries. ||In the most recent available flooding assessment for Eastern Pennsylvania, there were 22 homes and businesses that were destroyed, 201 that suffered major damage, 672 that had minor damage and 1217 others that were affected. The preliminary damage estimate for the state of Pennsylvania was five hundred million dollars. Please look for possible updates in future monthly issues of stormdata.| |The combination of fresh water runoff and a weak southerly flow produced moderate tidal flooding during the evening high tide cycles from the 7th through the 9th and minor tidal flooding with all of the other high tide cycles from the evening of the 6th through overnight on the 11th. The highest tides occurred during the evening high tide cycle on the 8th in Philadelphia and Delaware Counties and the evening high tide cycle on the 9th in Bucks County. The evening high tide on the 8th in Philadelphia reached 9.41 feet above mean lower low water. Moderate tidal flooding starts at 9.2 feet above mean lower low water. The high tide in Newbold Island (Bucks County) reached 12.11 feet above mean lower low water. There is no current categorical tide gage information for this site. ||Tropical Storm Lee made landfall in Louisiana during the morning of the 4th and moved slowly northeast. An approaching cold front from the Mississippi Valley reached Lee by the morning of the 5th and transformed it to an extratropical system on the 5th in Mississippi. The same cold front acted as a conduit for Lee's moisture farther to the northeast. Showers and thunderstorms from that approaching cold front arrived during the evening and overnight on the 5th  and set off the first round of flash flooding rains in Northeast Pennsylvania. The front then stalled just south of Delmarva on the 6th. A relative lull in the rain then occurred during the morning of the 6th. As the front started to back north as a warm front later in the day on the 6th, more bands of heavier rain returned that afternoon and particularly that evening. A blocking weather pattern then moved the frontal boundary little from the morning of the 7th into the morning of the 8th across southeast Pennsylvania. A couple of bands of flash flood producing rains started to form and move east into Eastern Pennsylvania during the late afternoon and evening of the 7th and continued through the night. The frontal boundary started to drift offshore later in the day on the 8th and most of the precipitation associated with Lee was done. The remnants of Tropical Storm Lee that interacted with a stalled frontal boundary produced several days with periods of heavy rain across Eastern Pennsylvania from the 5th into the 8th. Event Narrative: The second round of heavier rain that started on the 7th in Chester County caused additional flooding along the Brandywine Creek. The Brandywine Creek at Chadds Ford had moderate flooding and was above its 9 foot flood stage from 1110 p.m. EDT on the 7th through 326 p.m. EDT on the 8th. It crested at 11.70 feet at 615 a.m. Entire event rainfall totals included 6.35 inches at the Philadelphia International Airport and 4.65 inches in Nether Providence Township. Heavy downpours caused flash flooding along a tributary of Cobbs Creek in Haverford Township. A state of emergency was declared in the township. Vehicles were stranded and schools were closed on the 8th. A shelter was opened at the Linwood Elementary School. The second round of heavier rain that started overnight on the 7th produced additional widespread poor drainage, creek and river flash flooding and flooding in Philadelphia that persisted into the evening of the 8th. Major flooding occurred along most of the smaller creeks within the city. Along the Schuylkill River, Main Street in Manayunk was flooded as was Kelly Drive. Kelly Drive was not re-opened until the 11th. Along the Wissahickon Creek, Lincoln Drive was closed.| |The Schuylkill River in Philadelphia was above its 11 foot flood stage from 203 a.m. EDT through 818 p.m. It crested at 12.53 feet at 5 a.m. EDT. The Wissahickon Creek at its mouth with the Schuylkill River had major flooding, its second highest crest on record and its highest crest since Hurricane Floyd on September 16, 1999. It was above its 5 foot flood stage from 226 a.m. EDT through 626 p.m. It crested at 10.89 feet at 10 a.m. The Pennypack Creek at the Rhawn Street Bridge had major flooding, its fourth highest crest on record and its highest crest since Hurricane Floyd on September 16, 1999. It was above its 7 foot flood stage from 352 a.m. EDT through 220 p.m. It crested at13.04 feet at 915 a.m. |The Frankford Creek at Castor Avenue had major flooding and its 5th highest crest on record. It was above its 7 foot flood stage from 237 a.m. EDT through 804 a.m. It crested at 11.39 feet at 415 a.m. EDT.|Entire event rainfall totals included 7.34 inches in Center City Philadelphia, 6.35 inches at the Philadelphia International Airport and 4.63 inches at the Northeast Philadelphia Airport. A band of showers and thunderstorms with heavy rain caused flash flooding of smaller streams and poor drainage areas in the southern part of Montgomery County. Flooding occurred along the Wissahickon Creek and continued along the Schuylkill River. In Whitpain Township, along the Wissahickon Creek, 40 residents were evacuated on West Maple Street. Two buildings collapsed in Ambler Borough. A band of showers and thunderstorms with heavy rain caused flash flooding of smaller streams as well as poor drainage flooding in lower Bucks County. Flooding occurred in the Neshaminy Basin and the heavy rain helped exacerbate the ongoing or starting of flooding along the Delaware River. Along the Neshaminy Creek, in Langhorne, creek flooding reached the Bridgetown Mill House. Just as the flooding from the first round of the heavier rain ended,  the second round of heavier rain  caused additional poor drainage flooding as well as flash flooding and flooding of creeks. This time the Delaware River flooded. Along the Delaware River, residents from fifteen homes in the River Mawr section of Yardley were evacuated. There were evacuations in Upper Makefield Township and a limited state of emergency was declared in New Hope. The New Hope-Lambertville Bridge was closed crossing the Delaware River.||The Delaware River at Reigelsville had moderate flooding, its 8th highest crest on record and highest crest since June 29, 2006. It was above its 22 foot flood stage from 820 p.m. EDT on the 7th through 540 a.m. EDT on the 10th. It crested at 28.06 feet at 515 a.m. EDT on the 9th. Farther downstream, the Delaware River at Frenchtown (Hunterdon County) had moderate flooding, its 8th highest crest on record and highest crest since June 29, 2006. It was above its 16 foot flood stage from 216 a.m. EDT on the 8th through 200 a.m. It crested at 19.02 feet at 545 a.m. Farther downstream, the Delaware River at Stockton (Hunterdon County) had moderate flooding, its 10th highest crest on record and highest crest since June 29, 2006. It was above its 18 foot flood stage from 240 a.m. EDT on the 8th through 337 a.m. It crested at 21.76 feet at 645 a.m. Farther downstream, the Delaware River at New Hope had major flooding,  its 11th highest crest on record and highest crest since June 29, 2006. It was above its 13 foot flood stage from 358 a.m. EDT on the 8th through 1215 a.m. It crested at 16.14 feet at 700 a.m. Farther downstream, the Delaware River at Washington's Crossing had moderate flooding, its 8th highest crest on record and highest crest since June 29, 2006. It was above its 16 foot flood stage from 358 a.m. EDT on the 8th through 306 a.m. It crested at 20.04 feet at 745 a.m. Farther downstream, the Delaware River at Trenton (Mercer County) had moderate flooding, its 10th highest crest on record and highest crest since June 29, 2006. It was above its 20 foot flood stage from 417 a.m. EDT on the 8th through 537 a.m. It crested at 23.11 feet at 915 a.m. EDT on the 8th.| |The East Branch of the Perkiomen Creek at Dublin had moderate flooding and was above its 5 foot flood stage from 313 a.m. EDT through 610 a.m. It crested at 7.67 feet at 430 a.m. The Little Neshaminy Creek at Neshaminy had its second highest crest on record and highest crest since June 16, 2001. The creek was above its 8 foot flood stage from 313 a.m. EDT through 1047 a.m. It crested at 12.95 feet at 645 a.m. The Neshaminy Creek at Langhorne had major flooding and its 5th highest crest on record. It was above its 9 foot flood stage from 353 a.m. EDT through 1043 p.m. It crested at 18.09 feet at 245 p.m. EDT.| |Entire event rainfall totals included 8.51 inches in Perkasie, 7.34 inches at the Doylestown Airport, 7.28 inches in Washington Crossing, 7.25 inches in Doylestown, 6.89 inches in Newtown, 6.21 inches in Sellersville, 6.17 inches in Penndel and 6.00 inches in Neshaminy Falls. Just after the flooding from the first round of heavier rain ended, the flooding and flash flooding associated with the second round of heavier rain began in Chester County. Flooding along the East Branch of the White Clay Creek in Avondale Borough forced the evacuation of 40 residents. Flooding along the East Branch of the Brandywine Creek and U.S. Route 30 divided Downingtown Borough in half. In North Coventry Township, River Road along the Schuylkill River was flooded and closed. One vehicle became stuck in the flood waters.||The Schuylkill River at Pottstown (Montgomery County) had moderate flooding, its 6th highest crest on record and highest crest since June 29, 2006. The river was above its 12.5 foot flood stage from 505 p.m. EDT on the 7th through 141 a.m. It crested at 18.27 feet at 630 a.m. The West Branch Brandywine Creek at Honey Brook had moderate flooding and its 7th highest crest on record. It was above its 7 foot flood stage from 528 p.m. EDT through 1156 p.m. EDT on the 7th. It crested at 10.36 feet at 700 p.m. EDT.|Farther downstream, the West Branch Brandywine at Coatesville was above its 7 foot flood stage from 1102 p.m. EDT on the 7th through 142 a.m. It crested at 7.34 feet at 1200 a.m. The East Branch Brandywine at Downingtown had major flooding and was above its 7 foot flood stage from 537 p.m. EDT on the 7th through 225 a.m. It crested at 11.70 feet at 930 p.m. The main stem of  the Brandywine Creek at Chadds Ford had moderate flooding and was above its 9 foot flood stage from 1110 p.m. The French Creek at Phoenixville was again above its 8 foot flood stage from 520 p.m. EDT on the 7th through 515 a.m. It crested at 9.83 feet at 8 p.m. ||Entire event rainfall totals included 7.07 inches in West Chester, 6.81 inches in Avondale, 6.74 inches in Spring City, 6.68 inches in Unionville, 6.19 inches in Modena and 6.17 inches in Downingtown. The first round of heavier rain that started on the 6th produced widespread poor drainage, creek and river flooding in Philadelphia that persisted through the afternoon of the 7th. A mudslide forced the closure of the Schuylkill Expressway on the 7th between the Blue Route (Interstate 476) in Montgomery County and Girard Avenue in Philadelphia.The Schuylkill River in Philadelphia was above its 11 foot flood stage from 425 a.m. EDT through 6 p.m. It crested at 12.03 feet at 1230 p.m. The Wissahickon Creek at its mouth was above its 5 foot flood stage from 715 p.m. EDT on the 6th through 342 p.m. It crested at 6.22 feet at Noon EDT on the 7th. The Pennypack Creek at the Rhawn Street Bridge had moderate flooding and was above its 7 foot flood stage from 307 p.m. EDT on the 6th through 2 a.m. It crested at 9.46 feet at 1030 p.m. EDT on the 6th. The Pennypack Creek at the Rhawn Street Bridge was above its 7 foot flood stage again from 630 a.m. EDT through 1115 a.m. It crested at 8.34 feet at 930 a.m. The Frankford Creek at Castor Avenue was above its 7 foot flood stage from 711 p.m. EDT through 726 p.m. It crested at 7.21 feet at 715 p.m. Smaller rivers and streams flooded twice during successive periods of heavier rain in the county, once from the evening of the 6th into the early afternoon of the 7th and again from the late afternoon of the 7th into the afternoon of the 8th. The heavy rain saturated the soil and knocked over a couple of weak trees in Pottstown and Collegeville. Meanwhile flooding along the Schuylkill River started during the evening of the 6th and continued through the morning of the 10th. A mudslide forced the closure of the Schuylkill Expressway on the 7th between the Blue Route (Interstate 476) and Girard Avenue within Philadelphia. On the morning of the 7th, the Fort Washington Interchange of the Pennsylvania Turnpike was closed in both directions. There were road closures due to flooding in Pottstown, Lower Providence, Schwenksville and Collegeville. The Perkiomen Valley School District in Collegeville had two hour delayed openings as three bridges were closed.||The Schuylkill River at Pottstown had moderate flooding, its 6th highest crest on record and highest crest since June 29, 2006. Farther downstream the Schuylkill River at Norristown had moderate flooding and was above its 13 foot flood stage from 1056 p.m. EDT on the 6th through 530 a.m. It crested at 16.06 feet at 1015 a.m. EDT on the 7th.||During the first round of widespread flooding,  the West Branch Perkiomen Creek at Hillegass was above its 5 foot flood stage from 318 a.m. EDT through 407 a.m. It crested at 5.04 feet at 330 a.m. The East Branch of the Perkiomen Creek at Schwenksville was above its 7 foot flood stage from 919 p.m. EDT on the 6th through 220 p.m. It crested at 9.19 feet at 5 a.m. The main stem of the Perkiomen Creek at East Greenville was above its 4 foot flood stage from 603 p.m. EDT on the 6th through 1111 a.m. It crested at 5.73 feet at 745 a.m. Farther downstream, the Perkiomen Creek at Graterford had moderate flooding and was above its 11 foot flood stage from 1118 p.m. EDT on the 6th through 217 p.m. It crested at 13.93 feet at 545 a.m. The Wissahickon Creek at Fort Washington was above its 9 foot flood stage from 745 p.m. EDT on the 6th through 1205 a.m. It crested at 9.97 feet at 915 p.m. The Wissahickon Creek at Fort Washington then had moderate flooding and was above its 9 foot flood stage again from 509 a.m. EDT through 1056 a.m. It crested at 10.86 feet at 815 a.m. EDT.||During the second round of widespread flooding, the East Branch of the Perkiomen Creek at Schwenksville had major flooding and its 7th highest crest on record. It was above its 7 foot flood stage from 544 a.m. EDT through 214 p.m. It crested at 10.82 feet at 1215 p.m. The Main Stem of the Perkiomen Creek at East Greenville was above its 4 foot flood stage from 620 p.m. EDT through 1113 p.m. It crested at 4.48 feet at 915 p.m. The Wissahickon Creek at Fort Washington had major flooding and its 2nd highest crest on record, 2nd only to the crest recorded during Hurricane Floyd on September 16, 1999. It was above its 9 foot flood stage from 250 a.m. EDT through 1242 p.m. It crested at 16.68 feet at 645 a.m. EDT.||Entire event rainfall totals included 7.99 inches in Conshohocken, 6.74 inches in Blue Bell, 5.80 inches in Norristown, 5.42 inches in Pottstown, 5.40 inches in Green Lane, 4.75 inches in Collegeville and 4.66 inches in Rockledge. A second band of showers and thunderstorms with heavy rain caused flash flooding of smaller streams and poor drainage areas in the eastern part of Chester County during the late afternoon and early evening of the 7th. This also helped initiate and exacerbate the flooding in the Brandywine Creek Basin as well as along the Schuylkill River. During the first round of widespread flooding in Chester County, the French Creek at Phoenixville was above its 8 foot flood stage from 245 a.m. EDT through 632 a.m. It crested at 8.97 feet at 4 a.m. The East Branch of the Brandywine Creek at Downingtown had moderate flooding and was above its 7 foot flood stage from 839 p.m. EDT on the 6th through 1006 a.m. It crested at 9.53 feet at 615 a.m. The main stem of the Brandywine Creek at Chadds Ford was above its 9 foot flood stage from 225 a.m. EDT through 448 p.m. It crested at 10.14 feet at 1230 p.m. The Valley Creek at Valley Forge was above its 7 foot flood stage from 809 p.m. It crested at 7.57 feet at 845 p.m. The Valley Creek at Valley Forge was again above its 7 foot flood stage from 328 a.m. EDT through 746 a.m. It crested at 7.48 feet at 645 a.m. The first round of heavier rain that started on the 6th and persisted overnight caused poor drainage and mostly smaller creek flooding in Bucks County. ||The East Branch of the Perkiomen Creek at Dublin was above its 5 foot flood stage from 831 p.m. EDT through 1015 p.m. It crested at 5.51 feet at 930 p.m. The East Branch of the Perkiomen Creek at Dublin was again above its 5 foot flood stage from 410 a.m. EDT through 615 a.m. It crested at 5.68 feet at 515 a.m. The Neshaminy Creek at Langhorne had moderate flooding and was above its 9 foot flood stage from 835 p.m. EDT on the 6th through 443 a.m. It crested at 10.27 feet at 11 p.m. The Neshaminy Creek at Langhorne again had moderate flooding and was above its 9 foot flood stage from 849 a.m. EDT through 735 p.m. It crested at 10.7 feet at 246 p.m. The first round of widespread heavier rain that started on the 6th caused creek flooding concentrated in the southwest half of Delaware County. The Brandywine Creek at Chadds Ford was above its 9 foot flood stage from 225 a.m. The Chester Creek at Chester was above its 8 foot flood stage from 828 p.m. EDT through 1115 p.m. It crested at 8.39 feet at 1015 p.m. The Chester Creek at Chester was above its 8 foot flood stage again from 328 a.m. EDT through 721 a.m. It crested at 9.43 feet at 530 a.m. The Crum Creek at Newtown Square was above its 6 foot flood stage from 325 a.m. EDT through 649 a.m. It crested at 7.07 feet at 430 a.m. A band of showers and thunderstorms with heavy rain caused flash flooding of smaller streams as well as poor drainage flooding in Philadelphia. It also caused the drowning death of a 27-year-old woman who was caught in flood waters in the East Germantown section of the city. She was discovered in the rear of her Sports Utility Vehicle at the intersection of Musgrave and Haines Streets on the morning of the 8th. The Wingohocking Creek, which is a creek that was buried underground during the 19th century had its waters back out of sewer grates and manhole covers in that section of the city. Godfrey Avenue and Wister Street also flooded in East Germantown. The wall of a church also collapsed. Most gaged creeks within Philadelphia flooded as well as the Schuylkill River.