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Due to the current gap in continued funding from the U.S. National Science Foundation (NSF), the NSF Unidata Program Center has temporarily paused most operations. See NSF Unidata Pause in Most Operations for details.
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SERVICE CHANGE NOTICE 09-36
NATIONAL WEATHER SERVICE HEADQUARTERS WASHINGTON DC
330 PM EDT MON MAY 4 2009
TO: SUBSCRIBERS:
-FAMILY OF SERVICES
-NOAA WEATHER WIRE SERVICE
-EMERGENCY MANAGERS WEATHER INFORMATION NETWORK
OTHER NWS PARTNERS...AND NWS EMPLOYEES
FROM: CRAIG SCHMIDT
CHIEF...METEOROLOGICAL SERVICES DIVISION
WESTERN REGION HEADQUARTERS SALT LAKE CITY UT
SUBJECT: EXPERIMENTAL CRITERION CHANGE FOR HAIL SIZE IN SEVERE
THUNDERSTORM WARNING DETERMINATION AT ALL WESTERN
REGION WEATHER FORECAST OFFICES FROM THREE-QUARTER
/0.75/ INCH TO ONE /1/ INCH IN DIAMETER OR LARGER
EFFECTIVE JUNE 1 2009
ON JUNE 1 2009...ALL WESTERN REGION /WR/ WEATHER FORECAST
OFFICES /WFOS/ WILL BEGIN USING A NEW EXPERIMENTAL HAIL
CRITERION FOR DETERMINING WHEN TO ISSUE SEVERE THUNDERSTORM
WARNINGS /SVR/. IN AN EFFORT TO BETTER REPRESENT HAIL WHICH
PRODUCES DAMAGE AND TO REDUCE USER COMPLACENCY TO NUMEROUS
SEVERE THUNDERSTORM WARNINGS FOR THREE-QUARTER /0.75/ INCH
DIAMETER HAIL...THE WFOS IN WR WILL USE HAIL CRITERION OF ONE
/1/ INCH IN DIAMETER OR LARGER AS OPPOSED TO THE REFERENCED
/0.75/ INCH CRITERION. THERE IS NO CHANGE IN HAIL CRITERION FOR
AVIATION THUNDERSTORM WARNINGS /I.E. CONVECTIVE SIGMETS/ OR FOR
SPECIAL MARINE WARNINGS /SMW/.
A SERVICE CHANGE NOTICE /SCN/ ANNOUNCING THE NWS CENTRAL
REGION/S /CR/ SIMILAR EXPERIMENT IS AVAILABLE ONLINE AT /USE
LOWER CASE LETTERS/:
HTTP://WWW.WEATHER.GOV/OS/NOTIFICATION/SCN09-19HAIL_CHANGE.TXT
A PRODUCT DESCRIPTION DOCUMENT /PDD/ FOR THIS WR EXPERIMENT IS
AVAILABLE ONLINE AT /USE LOWER CASE LETTERS/:
HTTP://PRODUCTS.WEATHER.GOV/
THIS EXPERIMENT WILL BE IMPLEMENTED FOR ALL AREAS IN EIGHT
WESTERN STATES: ARIZONA...CALIFORNIA...IDAHO...MONTANA...
NEVADA...OREGON...UTAH AND WASHINGTON.
NO CHANGE WILL OCCUR WITH RESPECT TO WIND SPEED IN SEVERE
THUNDERSTORM WARNINGS. WINDS EQUAL TO OR IN EXCESS OF 50 KNOTS
/58 MPH/ WILL REMAIN THE CRITERION.
FOR THUNDERSTORMS EXPECTED TO PRODUCE AROUND 3/4 INCH TO 7/8
INCH DIAMETER HAIL BUT REMAIN BELOW SEVERE WIND LIMITS...WR WFOS
ARE EXPECTED TO USE THE SPECIAL WEATHER STATEMENT /SPS/...
HEADLINED AS A SIGNIFICANT WEATHER ADVISORY. WFOS WILL ALSO
CONTINUE TO COLLECT AND DISTRIBUTE HAIL REPORTS THAT ARE THREE-
QUARTERS /0.75/ INCH IN DIAMETER OR GREATER BY WAY OF THE LOCAL
STORM REPORT /LSR/ AS USUAL.
IF YOU HAVE QUESTIONS...PLEASE CONTACT:
CRAIG SCHMIDT
NATIONAL WEATHER SERVICE
WESTERN REGION HEADQUARTERS
125 SOUTH STATE STREET
ROOM 1311
SALT LAKE CITY UT 84138
801-524-4000
CRAIG.SCHMIDT@xxxxxxxx
NATIONAL SERVICE CHANGE NOTICES ARE ONLINE AT /USE LOWER CASE LETTERS/:
HTTP://WWW.WEATHER.GOV/OM/NOTIF.HTM
$$
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