Thursday, December 10, 2009

National Change in Severe Hail Criterion

PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE HUNTSVILLE AL
900 AM CST THU DEC 10 2009

TO: SUBSCRIBERS: NWS PARTNERS...USERS AND EMPLOYEES

SUBJECT: NATIONAL CHANGE IN MINIMUM HAIL SIZE CRITERION
FOR ISSUING SEVERE THUNDERSTORM /SVR/ AND
SEVERE WEATHER STATEMENT /SVS/ PRODUCTS EFFECTIVE
JANUARY 5 2010

EFFECTIVE TUESDAY JANUARY 5 2010 AT 0001 COORDINATED UNIVERSAL TIME /UTC/...ALL NATIONAL WEATHER SERVICE /NWS/ WEATHER FORECAST OFFICES /WFO/ WILL OPERATIONALLY CHANGE THE MINIMUM HAIL SIZE CRITERION USED TO ISSUE SEVERE THUNDERSTORM WARNING /SVR/ AND SEVERE WEATHER STATEMENT /SVS/ PRODUCTS FROM 3/4 INCH /PENNY/ DIAMETER OR LARGER TO 1 INCH /QUARTER/ DIAMETER OR LARGER HAIL.

NO CHANGE IS BEING MADE TO THE SVR AND SVS PRODUCT WIND CRITERION OF WIND GUSTS EQUAL TO OR IN EXCESS OF 50 KNOTS /58 MPH/.

A PUBLIC INFORMATION STATEMENT /PNS/ SOLICITING COMMENTS REGARDING THIS CHANGE WAS ISSUED SEPTEMBER 23 2009 /PLEASE USE LOWERCASE/:

HTTP://WWW.WEATHER.GOV/OS/NOTIFICATION/PNS09_1_INCH_HAIL.TXT

THE NATIONAL WEATHER SERVICE /NWS/ RECEIVED 63 COMMENTS IN RESPONSE TO THE PNS...54 /86 PERCENT/ OF WHICH SUPPORTED THIS CHANGE. A WEB PAGE WILL BE CREATED TO ADDRESS ALL COMMENTS SINCE SOME COMMENTS INDICATED A NEED FOR ADDITIONAL OUTREACH. THIS WEB PAGE WILL BE AVAILABLE BY DECEMBER 15 2009 AND WILL BE PUBLICIZED VIA ANOTHER PNS.

THE NWS RECEIVED ALL COMMENTS BEFORE DECIDING TO CHANGE MINIMUM HAIL SIZE CRITERION FOR SVR AND SVS PRODUCTS.

CENTRAL AND WESTERN REGION WFO/S CURRENTLY ISSUE SVR AND SVS PRODUCTS EXPERIMENTALLY USING THE 1 INCH /QUARTER/ DIAMETER OR LARGER HAIL SIZE CRITERION /PLEASE USE LOWERCASE/:

HTTP://WWW.NWS.NOAA.GOV/OM/NOTIFICATION/SCN09-19HAIL_CHANGE.TXT

AND

HTTP://WWW.NWS.NOAA.GOV/OM/NOTIFICATION/SCN09-36WR_HAIL_EXP.TXT

THESE WFO/S WILL CONTINUE TO ISSUE 1 INCH /QUARTER/ HAIL SIZE CRITERION PRODUCTS EXPERIMENTALLY THROUGH JANUARY 4 2010. ALL NWS WFO/S WILL ADOPT THE NEW CRITERION OPERATIONALLY ON JANUARY 5 2010.

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