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Flash Flood Forecasting Over Complex Terrain With an Assessment of the Sulphur Mountain NEXRAD in Southern California (2005) / Chapter Skim
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Appendix D: National Weather Service Flash Flood Verification Procedures
Pages 176-179

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From page 176...
... For verification purposes, multiple flash flood events in the same county separated by less than 30 minutes are considered duplicates; therefore, only the first entry is made to the event database. This rule has the following exceptions: 1This information is excerpted from the National Weather Service Operations and Services Performance manual 10-1601 entitled "Verification Procedures" (NWS, 2004d)
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From page 177...
... Quality Assurance Rules In an attempt to reduce the impact of erroneous short-fused warnings on customers and, at the same time, more accurately measure the quality of NWS warnings, the OCWWS Performance Branch has developed a set of rules stating how these short-fused warnings are archived. · Rule 1: How Warnings are Entered into the Database.
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From page 178...
... Display of Verification Statistics NWS employees access FFW verification statistics through the Stats on Demand feature of the NWS Verification Web Page. Stats on Demand accesses an interactive database that provides verification statistics custom ized to the user's request.
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From page 179...
... Backup Mode for Warnings When a WFO goes into backup mode, FFWs are still sorted by county, so all FFWs issued by the backup office are attributed to the primary WFO. Preliminary Flash Flood Warning Reports The regional headquarters will report to the OCWWS Performance Branch no later than the 14th of each month preliminary flash flood warning verification statistics for the previous month.
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Key Terms

  • lead time
  • verification statistics
  • flood warning
  • performance branch
  • assurance rules

  • preliminary flash
  • ocwws performance
  • storm data
  • data reports
  • verification web

  • verification procedures
  • national weather
  • warning verification
  • nws verification
  • event database

  • weather service
  • average lead
  • nws warnings
  • lead times
  • county separated

  • revised version
  • flood event
  • unwarned event
  • reports prepared
  • warning sample

  • verification purposes
  • events occur
  • multiple flash
  • month preliminary
  • interactive database


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