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610 NOUS40 KWBC 251611 FOS/NOAAPORT NOTICE NO. 1751 JULY 25... 2000 ATTENTION FAMILY OF SERVICES SUBSCRIBERS/NOAAPORT USERS SUBJECT CHANGE MRF MOS GUIDANCE EFFECTIVE IMMEDIATELY... GUIDANCE FOR THE PROBABILITY OF PRECIPITATION AND FOR QUANTITATIVE PRECIPITATION AMOUNT WILL BE ADDED TO THE NEW MRF MOS MESSAGES. THESE MESSAGES ARE IDENTIFIED WITH WMO HEADERS FEPA20... FEUS21-FEUS36... AND FEAK37-FEAK39... AND ARE STORED AS MEX PRODUCTS IN THE AWIPS TEXT DATA BASE. THE PROBABILITY OF PRECIPITATION GUIDANCE PROVIDES FORECASTS OF THE PROBABILITY OF PRECIPITATION EQUALING OR EXCEEDING 0.01 INCHES OF LIQUID-EQUIVALENT AMOUNT IN A 12- OR 24-H PERIOD. EXCEPT FOR THE STATIONS IN THE FEPA20 MESSAGE... THE 12-H PROBABILITIES LABELED AS P12 ARE VALID FOR PERIODS OF 12-24... 24-36... 36-48... AND 180-192 HOURS AFTER 0000 UTC. FOR THE FEPA20 SITES... THE 12-H PROBABILITIES ARE VALID FOR PERIODS OF 18-30... 30-42... 42-54 AND 186-198 HOURS AFTER 0000 UTC. THE 24-H PROBABILITIES FOR ALL SITES ARE LABELED AS P24 AND ARE VALID 24-48... 48-72... 72-96... AND 168-192 HOURS AFTER 0000 UTC. THE QUANTITATIVE PRECIPITATION AMOUNT GUIDANCE LABELED AS Q12 AND Q24... RESPECTIVELY... FOR THE 12- AND 24-H PERIODS... PROVIDES CATEGORICAL FORECASTS OF PRECIPITATION AMOUNT CATEGORIES FOR THE SAME PROJECTIONS AS THE PRECIPITATION PROBABILITY... EXCEPT THAT THE LAST FORECAST PERIOD FOR PRECIPITATION AMOUNT ENDS AT 156 HOURS AFTER 0000 UTC. THE CATEGORICAL DEFINITIONS ARE AS FOLLOWS 0 - NO PRECIPITATION... 1- 0.01 TO 0.09 INCHES... 2 - 0.10 TO 0.24 INCHES.. 3 - 0.25 TO 0.49 4 - INCHES... 0.50 TO 0.99 INCHES... 5 - 1.00 TO 1.99 INCHES... AND 6 - 2.00 INCHES OR GREATER. MORE DETAILS ON THE NEW GUIDANCE MAY BE FOUND AT THE FOLLOWING ADDRESS HTTP//WWW.NWS.NOAA.GOV/TDL/SYNOP/MOS2000.HTM END NNNN ---------- End Forwarded Message ----------
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