# Presentation: 190591

## Valuing Weather Forecasts

**Rodney F. Weiher**
**NOAA Chief Economist**
**International Workshop**
**American Meteorological Society**
**January 2005**
**San Diego, California**

## Overview of Presentation

- Why weather forecasts have value and how you can estimate value.
- Review of work done in U.S. to estimate the value of forecasts.
- Ideas for getting results quickly in other countries, e.g., Russia

## Weather Forecasts Have Value When They Affect Decisions

- Better information about the weather allows people to make better decisions...
- (1) when dangerous weather threatens life and property
- (2) in everyday planning (e.g., outdoor activities, take a raincoat)
- (3) in normal economic activities that have some degree of weather dependence.

## There Are Several Ways to Estimate the Value of Forecasts

- Modeling of decisions, with and without forecasts, and of the expected consequences of these decisions.
- Asking people for self-assessments -- i.e., surveys to obtain value estimates.
- Data from actual events -- i.e., observed effects of weather phenomena with and without forecasts or warnings.

## In the U.S., We Have Used All These Approaches, E.g..

- Decision modeling was used for agriculture, electricity generation, and fisheries.
- Information from surveys was used for the valuation of forecasts used by households.
- Observational data were used for valuing hurricane and heat wave warnings.

## Review of Forecast Valuation Work Done in U.S.

- Forecasts of life-threatening weather (e.g., hurricanes).
- Forecasts used by households for everyday planning.
- Forecasts that benefit economic activities affected by weather.

## Forecasts of Life-Threatening Weather Have High Value

- Weather forecasts, warnings, and emergency responses associated with hurricanes are valued at $3 billion per year (2/3 of this from reduced loss of life).
- Weather forecasts, warnings, and emergency responses associated with heat waves were valued at  $.5 billion over three years in a single U.S. city (Philadelphia).

## The Value of Forecasts used by U.S. Households is Very High 

- 105 million U.S. households obtain a weather forecast at least once a day.
- We valued household use with state-of-the-art survey techniques (contingent valuation and conjoint analysis).
- The aggregate annual value of forecasts used by U.S. households was estimated to be $11.4 billion.

## Much of U.S. Economic Activity is affected by Weather

- Nearly 30 percent of U.S.’s GDP ($3 trillion) is directly or indirectly affected by weather (sectors affected range from finance to retail trade).
- About 10 percent of U.S.’s GDP ($1 trillion) is directly affected (e.g., agriculture, energy, aviation, construction, outdoor recreation, and fisheries).

## We Have Completed a Limited Number of Forecast Valuations for Economic Activities

- We have focussed on the decision modeling approach to valuing weather forecasts.
- This is a demanding approach that has limited the number of activities we have been able to value so far.
- Key studies completed are for agriculture, fisheries, and electricity.

## Benefits of ENSO Forecasts for Agriculture and Fisheries

- U.S. Agriculture:  $200 - $300 million/year
- Mexican agriculture: $10 - $25 million/year
- World agriculture:  $450 to $550 million/year (minimum)
- U.S. corn storage: $200 million/year
- World rice stocks: $23 billion/year (prelim.)
- NW U.S. salmon fishery: $1 million/year

## Benefits of Weather Forecasts in Electricity Generation

- Cost savings were heavily concentrated in the southeastern U.S. where summers are hot and weather is relatively variable.
- Generation cost savings: $155 million/year.
- This is $.061/mega-watt-hour produced.
- This is about 70 percent of the cost savings attainable with a perfect forecast.

## Russia Needed Approaches to Produce Results Quickly

- Study by Bedritsky and Khandozko values selected Roshydromet services at 1.75 billion rubles ($59.6 million).
- Some data may exist to document life-saving benefits of weather forecasts.
- Surveys (which you are pursuing) offer a possible avenue to quick results.
- Scaling of U.S. results may be possible in some cases.

## You Might Look at Data on Lives Lost to Weather Events

- If weather forecast quality/distribution has deteriorated since 1991, more loss of life from weather events may have occurred.
- Correlating loss of life with state of weather forecasting might provide some direct data on the benefits of forecasts.
- You may need to “control for” intensity of weather events.

## Usefulness of Surveys Depends on How Questions are Posed

- One can ask, “What are forecasts worth to you?”
- Or one can ask a sequence of questions that leads the respondent to consider carefully the effects of differing weather, how often and in what way decisions would differ based on weather forecasts, and what might be the cost savings from better decisions.

## Suggested Questions for Industries Affected by Weather

- What weather makes a difference for your industry?  For this weather ...
- How would you operate with a perfect weather forecast?
- How would you operate with no weather forecast?
- How much cost is saved by having a perfect forecast?

## Suggested Survey Results Could be Used to Value Forecasts

- Cost savings from knowing weather for sure would be multiplied by probability of each of kind of weather and summed over kinds of weather.
- This produces the expected value of a perfect forecast.
- U.S. results could be used to infer the fraction of this value realized by an NWS forecast.

## Scaling U.S. Results to Russian Economy Might be Useful 

- Existing benefit estimates can be expressed as percentages of output or per household.
- These could multiply Russian sector outputs or number of households.
- This procedure provides value estimates quickly, and could also indicate where more intensive studies are needed for Russia.

## Some Existing Results Expressed Relative to Sectors ...

- Value of weather forecasts for Australia and U.S. agriculture is about $1/acre (or 2 to 3 percent of U.S. on-farm income).
- Long-range weather forecasts add up to 5% to value of U.S. Pacific NW salmon fishery.
- U.S. electricity generation costs savings from forecasts are $.061/mega-watt-hour.
- U.S. and Australian households value forecasts at $16-20/household per year.

## Summary

- Weather forecasts do save lives...
- And forecasts have substantial economic value across sectors and countries.
- Existing studies and on-going surveys can provide quick value estimates for Russia.
- In the longer term, economic methods could guide development of cost-effective and sustainable hydrometeorological services.

## References

- Adams, Richard M., Laurie L. Houston, Bruce A. McCarl, Mario Tiscareno L., Jaime Matus G., Rodney F. Weiher.  “The Benefits to Mexican agriculture of an El Nino Southern Oscillation (ENSO) Early Warning System.”  *Agricultural and Forest Meteorology* 115: 183-194.  2003.
- Adams, Richard M., Chi-Chung Chen, Bruce A. McCarl, and Rodney F. Weiher.  “The
- 	Economic Consequences of ENSO Events for Agriculture.” *Climate Research* 13: 165-172, 1999.
- Adams, Richard M. Chi-Chung Chen, Bruce A. McCarl, and Rodney Weiher.  “The Economic Consequences of ENSO Events: the 1997-98 El Nino and the 1998-99 La Nina.”  Faculty Paper Series.  Faculty Paper 99-2, December 1998.  Department of Agricultural Economics, Texas A&M University, College Station TX.
- Anaman, K. A., Lellyett, S. C., Drake, L., Leigh, R. J., Henderson-Sellers, A., Noar, P. F., Sullivan, P. J., & Thampapillai, D. J.  “Benefits of meteorological services: evidence from recent research in Australia.” *Meteorological Applications*, 5: 103-115, 1998.
- Bedritsky, A.I. and L.A. Khandozko. “The Economic benefits of hydrometeorological services.” *World Meteorological Organization Bulletin*, 50: 219-223, 2001.
- Chen, Chi-Chung, Bruce A. McCarl, and Richard M. Adams.  “Economic Implications of Potential ENSO Frequency and Strength Shifts.” *Climatic Change* 49: 147-159, 2001.
- Costello, Christopher J., Richard M. Adams, and Stephen Polasky. “The Value of El Nino Forecasts in the Management of Salmon:  A Stochastic Dynamic Assessment.” *American Journal of Agricultural Economics* 80 (November 1998): pp. 765-777, 1998.

## References

- Freebairn, J.W. and Zillman, J.W.  “Economic benefits of meteorological services.” *Meteorological Applications*, 9 (1): 33-44, 2002.
- Harrison, M.S. and N.E. Graham. “Forecast quality, forecast applications and forecast value: cases from southern African seasonal forecasts.” *World Meteorological Organization Bulletin* 50: 228-231, 2001.
- Lazo, Jeffrey K. “Economic Value of Current and Improved Weather Forecasts in the US Household Sector.” Report prepared for Rodney F. Weiher, Chief Economist, Program Planning and Integration, NOAA, by Stratus Consulting, Boulder CO, November 2002.
- Solow, Andrew R., Richard M Adams, Kelly J. Bryant, David M. Legler, James J. O’Brien, Bruce A. McCarl, William Nayda, and Rodney Weiher.  “The Value of Improved ENSO Prediction to U.S. Agriculture.”  *Climatic Change* 39: 44-60, 1998.
- Teisberg, Thomas J., Kristie L. Ebi, Laurence S. Kalkstein, Lawrence Robinson, and Rodney F. Weiher.  “Heat Watch/Warning Systems Save Lives: Estimated Costs and Benefits for Philadelphia 1995-1998.” Forthcoming in *Bulletin of the American Meteorological Society*.
- Teisberg, Thomas J. and Rodney F. Weiher. “The Value of National Weather Service Forecasts in Scheduling Electricity Generation.” Draft, forthcoming December 2003.
- Zillman, J. W.  “The National Meteorological Service.” *WMO Bulletin*, 48 (2), April, 129-159, 1999.
- Zillman, J. W. and Freebairn, J. W.  “Economic framework for the provision of meteorological services.” *WMO Bulletin*, 50 (3), May, 206-215, 2001.