TABLE D.2 Example of Format for Reporting Preliminary Flash Flood Warning Verification Statistics

Preliminary Verification Statistics

Flash floods

Number of warnings issued

 

Number of verified warnings

 

Number of unverified warnings

 

Number of events

 

Number of events with warnings

 

Number of events without warnings

 

Average lead time

 

Probability of detection

 

False alarm rate

 

Critical success index

 

  • one or more dates (select beginning and ending date);

  • one or more counties, WFOs, states, NWS regions, or the contiguous United States.

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. When the 14th of the month falls on a weekend or holiday, the statistics are due the last business day prior to the 14th. Present the statistics in the format given in Table D.2. The OCWWS Performance Branch subsequently collates the regional data into a national summary.



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