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-------- Original Message --------858 NOUS41 KWBC 071242
PNSWSH
PUBLIC INFORMATION STATEMENT...COMMENT REQUEST
NATIONAL WEATHER SERVICE HEADQUARTERS WASHINGTON DC
842 AM EST MON MAY 7 2007
TO: FAMILY OF SERVICES /FOS/ SUBSCRIBERS...NOAA WEATHER
WIRE SERVICE /NWWS/ SUBSCRIBERS...EMERGENCY
MANAGERS WEATHER INFORMATION NETWORK /EMWIN/
SUBSCRIBERS...NOAAPORT SUBSCRIBERS...NATIONAL WEATHER
SERVICE /NWS/ PARTNERS AND OTHER USERS...AND NWS
EMPLOYEES
FROM: THOMAS GRAZIANO
ACTING CHIEF...HYDROLOGIC SERVICES DIVISION
SUBJECT: EXPERIMENTAL ENHANCEMENT OF GRIDDED EXCESSIVE
PRECIPITATION FORECAST PRODUCT TO INCLUDE GRIDDED DAY 2
AND DAY 3 FORECASTS
BEGINNING ON JUNE 5 2007 AT 1200 COORDINATED UNIVERSAL TIME /UTC/...ON AN EXPERIMENTAL BASIS...THE NWS HYDROMETEOROLOGICAL PREDICTION CENTER /HPC/ WILL BEGIN INCLUDING DAY 2 AND DAY 3 FORECASTS WITH THE CURRENT DAY 1 GRIDDED EXCESSIVE PRECIPITATION FORECAST PRODUCT AND WILL PROVIDE DRILL DOWN CAPABILITIES ON THE INTERNET GRAPHICS.
THE CURRENT DAY 1 GRIDDED EXCESSIVE PRECIPITATION FORECAST USES WORLD METEOROLOGICAL ORGANIZATION /WMO/ HEADER...MENC98 KWBC... AND AWIPS IDENTIFIER RBG94E AND IS PROVIDED ONLINE AT /USE LOWER CASE LETTERS/:
HTTP://WWW.HPC.NCEP.NOAA.GOV/QPF/EXCESS_RAIN.SHTML
THE EXCESSIVE PRECIPITATION FORECAST GRAPHIC FOR DAY 1 DISPLAYS
AREAS WHERE THE PROBABILITY OF PRECIPITATION EXCEEDING FLASH
FLOOD GUIDANCE ISSUED BY THE RIVER FORECAST CENTERS IS:
-SLIGHT /SLGT/: DEFINED AS THREAT IN THE RANGE 5 PERCENT TO LESS THAN 10 PERCENT -MODERATE /MDT/: DEFINED AS THREAT FROM 10 PERCENT TO LESS THAN 15 PERCENT
-HIGH: DEFINED AS THREAT 15 PERCENT OR GREATER. AREAS WHERE THEPRECIPITATION IS EXPECTED TO EXCEED 5 INCHES ARE ALSO INDICATED. THE HPC ROUTINELY DISSEMINATES A DAY 1 GRIDDED EXCESSIVE PRECIPITATION FORECAST PRODUCT FOUR TIMES DAILY. THE VALID TIME PERIOD IS 30 HOURS FOR THE PRIMARY ISSUANCES AT 0600 UTC AND 1800 UTC AND FOR THE REMAINDER OF THE INITIAL PERIOD ON THE UPDATE CYCLES AT 1500 UTC AND 0300 UTC. THE PRODUCT IS ISSUED ON AWIPS GRID 227 IN GRIDDED BINARY /GRIB2/ FORMAT AT 5 KILOMETER RESOLUTION. THE EXCESSIVE PRECIPITATION FORECAST GRAPHIC FOR DAYS 2 AND 3 DISPLAYS AREAS WHERE THE PROBABILITY OF PRECIPITATION AMOUNTS EXCEEDING THE FLASH FLOOD GUIDANCE AVAILABLE AT TIME OF PRODUCT ISSUANCE IS SLIGHT...MODERATE...AND HIGH AS DEFINED ABOVE. THE RIVER FORECAST CENTERS DO NOT CURRENTLY ISSUE FLASH FLOOD GUIDANCE FOR DAYS 2 AND 3...SO AT THIS TIME THE PRODUCT WILL BE BASED ON THE DAY 1 FLASH FLOOD GUIDANCE.
THE DAY 2 AND DAY 3 FORECASTS OF EXCESSIVE PRECIPITATION WILL BE DISSEMINATED TWO TIMES A DAY. THE VALID TIME PERIOD FOR THE DAY 2 AND DAY 3 PRODUCTS WILL BE 1200 UTC TO 1200 UTC FOR THE 0600 UTC ISSUANCE AND 000 UTC TO 000 UTC FOR THE 1800 UTC ISSUANCE. FOR THE DAY 2 PRODUCT...THE WORLD METEOROLOGICAL ORGANIZATION /WMO/ HEADER WILL BE MENS98 KWNH. FOR THE DAY 3 PRODUCT...THE WMO HEADER IS MENU98 KWNH.
THE DAY 2 AND DAY 3 EXCESSIVE PRECIPITATION FORECAST GRAPHICS WILL BE AVAILABLE ONLINE AT /USE LOWER CASE LETTERS/:
HTTP://WWW.HPC.NCEP.NOAA.GOV/QPF/EXCESS_RAIN.SHTML
THE INTERNET GRAPHICS WILL PROVIDE DRILL DOWN CAPABILITIES AND
LINKS TO LOCAL WATCHES AND WARNINGS.
USERS ARE ENCOURAGED TO PROVIDE FEEDBACK ON THESE EXPERIMENTAL PRODUCTS BY NOVEMBER 15 2007 USING THE BRIEF SURVEY AND COMMENT FORM AVAILABLE ONLINE AT THE HPC EXCESSIVE PRECIPITIATION WEB PAGE OR AT /USE LOWER CASE LETTERS/: HTTP://WWW.WEATHER.GOV/SURVEY/NWS-SURVEY.PHP?CODE=D2D3EPF
IF YOU HAVE ANY QUESTIONS OR COMMENTS...PLEASE CONTACT:MARY MULUSKY NATIONAL WEATHER SERVICE NATIONAL FLASH FLOOD PROGRAM COORDINATOR PHONE: 301-713-0006 EXT. 169 E-MAIL: MARY.MULUSKY@xxxxxxxx
THIS NOTICE AND OTHER CURRENT NATIONAL PUBLIC INFORMATION STATEMENTS ARE AVAILABLE ONLINE AT /USE LOWER CASE LETTERS/:
HTTP://WWW.NWS.NOAA.GOV/OM/NOTIF.HTMTHIS NOTICE IS LISTED AT THE TOP OF THE PAGE...ABOVE THE SERVICE CHANGE NOTICE AND TECHNICAL IMPLEMENTATION NOTICE BOX.
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