Technical Implementation Notice
NOUS41 KWBC 231211
PNSWSH
TECHNICAL IMPLEMENTATION NOTICE 06-71
NATIONAL WEATHER SERVICE HEADQUARTERS WASHINGTON DC
810 AM EDT MON OCT 23 2006
TO: FAMILY OF SERVICES /FOS/ SUBSCRIBERS...NOAA
WEATHER WIRE SERVICE /NWWS/ SUBSCRIBERS...
EMERGENCY MANAGERS WEATHER INFORMATION NETWORK
/EMWIN/ SUBSCRIBERS...NOAAPORT SUBSCRIBERS...
OTHER NATIONAL WEATHER SERVICE /NWS/ CUSTOMERS
AND PARTNERS... AND NWS EMPLOYEES
FROM: THERESE Z. PIERCE
CHIEF...MARINE AND COASTAL SERVICES BRANCH
SUBJECT: CHANGES TO TROPICAL CYCLONE PROBABILISTIC WIND SPEED
PRODUCTS: EFFECTIVE JANUARY 18 2007
EFFECTIVE JANUARY 18 2007 AT 0300 COORDINATED UNIVERSAL TIME
/UTC/...THE TEMPORAL RESOLUTION OF TROPICAL CYCLONE PROBABILISTIC
WIND SPEED FORECASTS WILL CHANGE FROM 12 HOURS TO 6 HOURS.
CURRENTLY NWS ROUTINELY DISSEMINATES TROPICAL CYCLONE
PROBABILISTIC WIND SPEED FORECASTS WHEN TROPICAL CYCLONES ARE
FORECAST FOR THE ATLANTIC...THE EASTERN PACIFIC...CENTRAL
PACIFIC...AND WESTERN PACIFIC HURRICANE BASINS. THESE PRODUCTS
ARE DISSEMINATED FOUR TIMES PER DAY WHEN TROPICAL CYCLONE
ADVISORIES ARE ISSUED: 0300...0900...1500...AND 2100 UTC...AND
IN CONJUNCTION WITH THE ISSUANCE OF SPECIAL TROPICAL CYCLONE
ADVISORIES. THESE PRODUCTS CURRENTLY PROVIDE THE PROBABILITIES OF
SUSTAINED WIND SPEED EXCEEDANCE FOR THREE THRESHOLDS: 34 KNOTS
...50 KNOTS...AND 64 KNOTS...AT 12 HOURLY FORECAST INTERVALS OUT
TO 120 HOURS. THE PRODUCTS ARE ISSUED ON AWIPS GRID 231 IN
GRIDDED BINARY /GRIB2/ FORMAT AT A 0.5 DEGREE KILOMETER
RESOLUTION.
THE WMO HEADERS AND ASSOCIATED FORECAST INTERVALS FOR THE
EXISTING PRODUCTS ARE AS FOLLOWS:
LDGA98 KNHC 0 HOUR
LDGC98 KNHC 12 HOUR
LDGE98 KNHC 24 HOUR
LDGG98 KNHC 36 HOUR
LDGI98 KNHC 48 HOUR
LDGJ98 KNHC 60 HOUR
LDGK98 KNHC 72 HOUR
LDGL98 KNHC 84 HOUR
LDGM98 KNHC 96 HOUR
LDGN98 KNHC 108 HOUR
LDGO98 KNHC 120 HOUR
ON JANUARY 18 2007 AT 0300 UTC...THE TEMPORAL RESOLUTION OF THESE
FORECAST PRODUCTS WILL CHANGE FROM 12 HOURS TO 6 HOURS. THE WMO
HEADERS AND THE ASSOCIATED FORECAST INTERVALS FOR THE NEW SIX
HOURLY PRODUCTS ARE LISTED BELOW. USERS WISHING TO RECEIVE THE
NEW SIX HOURLY FORECAST PRODUCTS MUST MAKE THE FOLLOWING CHANGES
TO THEIR DATABASES.
WMO HEADER FORECAST INTERVAL ACTION
LDGB98 KNHC 6 HOURS ADD
LDGD98 KNHC 18 HOURS ADD
LDGF98 KHHC 30 HOURS ADD
LDGH98 KNHC 42 HOURS ADD
MDGM98 KNHC 54 HOURS ADD
MDGN98 KNHC 66 HOURS ADD
MDGT98 KNHC 78 HOURS ADD
MDGU98 KNHC 90 HOURS ADD
MDGV98 KNHC 102 HOURS ADD
MDGW98 KNHC 116 HOURS ADD
IF YOU HAVE QUESTIONS REGARDING THIS NOTICE...PLEASE CONTACT:
TIMOTHY SCHOTT
NATIONAL WEATHER SERVICE
MARINE AND COASTAL SERVICES BRANCH
1325 EAST WEST HIGHWAY
SILVER SPRING MARYLAND 20910
EMAIL: TIMOTHY.SCHOTT@NOAA.GOV
THIS AND ALL OTHER NWS TECHNICAL IMPLEMENTATION NOTICES ARE
AVAILABLE AT /USE LOWER CASE LETTERS/:
HTTP://WWW.NWS.NOAA.GOV/OM/NOTIF.HTM
$$
NNNN