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154 NOUS40 KWBC 131425 FOS/NOAAPORT NOTICE NO. 1742 JULY 13... 2000 ATTENTION FAMILY OF SERVICES SUBSCRIBERS/NOAAPORT USERS SUBJECT NOTICE OF INTENT TO CHANGE AVN MOS GUIDANCE EFFECTIVE WITH THE 1200 UTC FORECAST CYCLE ON JULY 18...2000... GUIDANCE FOR CEILING HEIGHT AND TOTAL SKY COVER WILL BE ADDED TO THE NEW AVN MOS MESSAGES. THESE MESSAGES ARE IDENTIFIED WITH WMO HEADERS FOPA20... FOUS21-FOUS26... AND FOAK37-FOAK39... AND ARE STORED AS MAV PRODUCTS IN THE AWIPS TEXT DATA BASE. THE CEILING HEIGHT AND TOTAL SKY COVER GUIDANCE PROVIDE FORECASTS OF CATEGORIES OF CEILING HEIGHT AND SKY COVER VALID EVERY 3 HOURS FROM 6 TO 60 HOURS AFTER 0000 OR 1200 UTC AND AT THE 66- AND 72-H PROJECTIONS. THE CATEGORICAL DEFINITIONS FOR CEILING HEIGHT ARE AS FOLLOWS 1 - LESS THAN 200 FT... 2 - 200 TO 400 FT... 3 - 500 TO 900 FT... 4 -1000 TO 3000 FT... 5 - 3100 TO 6500 FT... 6 - 6600 TO 12000 FT... AND 7 - GREATER THAN 12000 FT OR UNLIMITED. THE CATEGORICAL DEFINITIONS FOR TOTAL SKY COVER ARE AS FOLLOWS CL - CLEAR... SC - GREATER THAN 0 TO 4 OCTAS OF TOTAL SKY COVER... BK - GREATER THAN 4 TO LESS THAN 8 OCTAS OF TOTAL SKY COVER... AND OV - 8 OCTAS OF TOTAL SKY COVER. MORE DETAILS ON THE NEW GUIDANCE MAY BE FOUND AT THE FOLLOWING HTTP/COLON//WWW.NWS.NOAA.GOV/TDL/SYNOP/MOS2000.HTM AT THE SAME TIME... EQUATIONS TO PREDICT THE CONDITIONAL PROBABILITY OF PRECIPITATION TYPE /FREEZING... FROZEN... OR LIQUID/ WILL ALSO BE IMPLEMENTED. GUIDANCE FOR PRECIPITATION TYPE WILL NOT BE DISPLAYED ON THE MESSAGE UNTIL SEPTEMBER 1. PRIOR TO THAT DATE... ANOTHER NOTICE WILL BE ISSUED WITH APPROPRIATE DETAILS. END NNNN ---------- End Forwarded Message ----------
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