[nws-changes] VTEC

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NSWSH

SERVICE CHANGE NOTICE 08-51
NATIONAL WEATHER SERVICE HEADQUARTERS WASHINGTON DC
308 PM EDT TUE AUG 12 2008

TO:        SUBSCRIBERS:
       -FAMILY OF SERVICES
       -NOAA WEATHER WIRE SERVICE
       -EMERGENCY MANAGERS WEATHER INFORMATION NETWORK
       OTHER NWS PARTNERS...USERS AND EMPLOYEES

FROM:        THERESE Z. PIERCE
       CHIEF...MARINE AND COASTAL SERVICES BRANCH

SUBJECT:    CHANGES TO THREE VALID TIME EVENT CODE /VTEC/
           PHENOMENA CODES. PHASE-IN BEGINS ON SEPTEMBER 29
           AND ENDS ON NOVEMBER 4 2008

BEGINNING ON SEPTEMBER 29 2008...NWS WEATHER FORECAST
OFFICES /WFOS/ SERVING THE COASTAL AND GREAT LAKES MARINE
AREAS WILL CHANGE THREE OF THE OPERATIONAL VALID TIME EVENT
CODE /VTEC/ PHENOMENA /PP/ CODES IN THE MARINE WEATHER
MESSAGE /MWW/ PRODUCT.

TABLE 1 SHOWS THE CURRENT PHENOMENA NAME...THE CURRENT
PHENOMENA CODE AND THE NEW PHENOMENA CODE FOR THE THREE
OPERATIONAL VTEC PHENOMENA IN THE MWW PRODUCT.
TABLE 1. 
PHENOMENA NAME    CURRENT VTEC CODE     NEW VTEC CODE
--------------    -----------------       -------------
DENSE FOG        FG              MF
DENSE SMOKE        SM              MS
ASHFALL                AF              MH

THERE WILL BE NO CHANGES TO ANY OF THE OTHER PHENOMENA /PP/
IN THE MARINE WEATHER MESSAGE /MWW/ AT THIS TIME.  THE MWW
IS THE ONLY PRODUCT AFFECTED BY THESE VTEC PHENOMENA CODE
CHANGES.

THE DEPLOYMENT OF THIS SOFTWARE CHANGE WILL GRADUALLY OCCUR
ACROSS ALL OF THE GREAT LAKES WFOS AND ALL COASTAL WFOS
EXCEPT THE THREE ALASKA REGION WFOS. A TOTAL OF 44 WFOS ARE
AFFECTED BY THIS SOFTWARE CHANGE. SOME OFFICES MAY INITIATE
THIS CHANGE AS EARLY AS SEPTEMBER 29 2008. WE EXPECT THIS
CHANGE TO BE COMPLETE ACROSS THE 44 OFFICES BY NOVEMBER 4
2008. BECAUSE OF SOFTWARE TESTING AND OPERATIONAL
REQUIREMENTS...IT IS NOT POSSIBLE FOR ALL 44 OFFICES TO
IMPLEMENT THIS SOFTWARE CHANGE ON THE SAME DATE.

CUSTOMERS RECEIVING THE MWW PRODUCT SHOULD REPROGRAM THEIR
SOFTWARE TO RECEIVE THESE NEW VTEC CODES LISTED IN TABLE 1. THERE WILL BE A SHORT PERIOD WHEN SOME WFOS WILL ISSUE THE 
MWW PRODUCTS WITH THE CURRENT VTEC CODE AND OTHERS WITH THE
NEW VTEC CODE.

THIS CHANGE IS DRIVEN BY CRITICAL OPERATIONAL REQUIREMENTS
FOR FIELD FORECASTERS WHICH TAKE PRECEDENCE OVER REQUIRED
ADVANCED LEAD TIME.
A DESCRIPTION OF THE VTEC CODE IS ONLINE AT /USE LOWERCASE/: 

 HTTP://WWW.WEATHER.GOV/OS/VTEC/

IF YOU HAVE QUESTIONS...PLEASE CONTACT:

 RICHARD MAY
 NATIONAL WEATHER SERVICE
 MARINE AND COASTAL SERVICES BRANCH
 1325 EAST WEST HWY ROOM 13132
 SILVER SPRING MARYLAND 20910
 PHONE:  301-713-1677 EXT 127

NWS SERVICE CHANGE NOTICES ARE ONLINE AT /USE LOWER CASE/:

 HTTP://WWW.WEATHER.GOV/OS/NOTIF.HTM

$$
NNNN
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