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Radar rainfall estimates for the Pittsburgh Little Pine Creek flash flood of May 1986
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1988
[PDF-2.10 MB]
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Description:Over a span of three hours on the afternoon of May 20, 1986, several thunderstorms developed over the drainage basin of Little Pine Creek in the northern suburbs of Pittsburgh. These thunderstorms remained stationary during their life cycles, producing small hail and up to 8 inches of total rainfall. The heavy rainfall led to a flash flood down Little Pine Creek, Broadhead Rim, and Harts Run which took nine lives and caused extensive property damage. The affected area was covered by a National Weather Service (NWS) RADAP II (Radar Data Processor, version II) which computed real-time products from the Pittsburgh NWS network radar. This paper discusses the performance of the RADAP II rainfall accumulation algorithm, the use of these rainfall estimates within the context of the NWS Forecast Office responding to a potential flash flood, and some implications for the future NWS NEXRAD/AWIPS-90 environment. some of the material presented in the paper has been excerpted from the NWS Disaster Survey Report dealing with this event.
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Rights Information:Public domain
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