[nws-changes] 20100113: Graphical Airmets-Fwd: ADMIN NOTICE NOUS41 KWBC]

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-------- Original Message --------
116 NOUS41 KWBC 131228 
PNSWSH

SERVICE CHANGE NOTICE 10-04
NATIONAL WEATHER SERVICE HEADQUARTERS WASHINGTON DC
725 AM EST WED JAN 13 2010

TO:       NATIONAL WEATHER SERVICE /NWS/ OFFICES
         FEDERAL AVIATION ADMINISTRATION USERS
         FAMILY OF SERVICES SUBSCRIBERS
         OTHER USERS OF NWS AVIATION FORECASTS

FROM:     CYNTHIA ABLEMAN
         CHIEF...AVIATION SERVICES BRANCH
SUBJECT: AVIATION WEATHER CENTER /AWC/ GRAPHICAL AIRMET 
         /G-AIRMET/ BECOMES AN OPERATIONAL PRODUCT:
         EFFECTIVE MARCH 16 2010

NOTE:     THE FOLLOWING CHANGES HAVE NO IMPACT ON NOAA WEATHER
         WIRE SUBSCRIBERS
EFFECTIVE TUESDAY MARCH 16 2010 AT 1500 UTC THE NWS WILL BEGIN ISSUING A GRAPHICAL AIRMANS METEOROLOGICAL ADVISORY /G-AIRMET/ AS AN OPERATIONAL PRODUCT.
THE G-AIRMET IS PRODUCED IN BUFR-FORMAT. IT IS A TIME SERIES DEPICTION OF AVIATION WEATHER HAZARDS AND ELEMENTS OCCURRING WITH OCCASIONAL OR GREATER FREQUENCY THROUGHOUT THE CONTERMINOUS U.S. AND ADJACENT COASTAL WATERS. THE AVIATION WEATHER HAZARDS AND ELEMENTS DEPICTED ARE: 

1.  SURFACE VISIBILITY /IFR VIS/ BELOW THREE /3/ STATUTE
   MILES...INCLUDING THE WEATHER RESTRICTING THE VISIBILITY.

2.  CLOUD CEILINGS /IFR CIG/ WITH BASES LESS THAN 1000 FEET
   ABOVE GROUND LEVEL /AGL/.

3.  WIDESPREAD MOUNTAIN OBSCURATION /MTN OBSCN/ WHERE VISUAL
   METEOROLOGICAL CONDITIONS /VMC/ CANNOT BE MAINTAINED...
   INCLUDING THE WEATHER CAUSING THE OBSCURATION.

4.  MODERATE TURBULENCE /MOD TURB/...INCLUDING THE TOP AND
   BOTTOM ALTITUDES OF THE TURBULENCE LAYER.

5.  SUSTAINED SURFACE WIND GREATER THAN 30 KNOTS /STG SFC WND/.

6.  NON-CONVECTIVE LOW LEVEL WIND SHEAR POTENTIAL BELOW 2000
   FEET AGL /LLWS/.

7.  MODERATE ICING /MOD ICE/...INCLUDING THE TOP AND BOTTOM
   ALTITUDES OF THE ICING LAYER.  WHEN THE BOTTOM ALTITUDE IS
   GIVEN AS FREEZING LEVEL /FRZLVL/...THE RANGE OF FREEZING
   LEVEL ALTITUDES IS ALSO PROVIDED.

8.  FREEZING LEVEL /FRZLVL/ CONTOURS AT THE SURFACE AND AT
   4000...8000...12000...AND 16000 FEET ABOVE MEAN SEA LEVEL.

9.  MULTIPLE FREEZING LEVELS /M_FZLVL/...INCLUDING THE HEIGHT OF
   THE HIGHEST AND LOWEST FREEZING LEVELS.
THE G-AIRMET WILL BE ISSUED ROUTINELY AT 0255...0855...1455... AND 2055 UTC AND AMENDED AS NECESSARY BETWEEN ROUTINE ISSUANCES. EACH ROUTINE ISSUANCE IS VALID THROUGH 12 HOURS WITH A STANDARD TIME RESOLUTION OF THREE /3/ HOURS.
G-AIRMET CONTAINS THREE /3/ BUFR MESSAGES FOR THE HAZARDS LISTED ABOVE: - /SIERRA/ FOR ITEMS 1 THROUGH 3 - /TANGO/ FOR ITEMS 4 THROUGH 6 - /ZULU/ FOR ITEMS 7 THROUGH 9. HEADER AND FTP INFORMATION WILL BE PROVIDED IN THE PRODUCT DESCRIPTION DOCUMENT BEFORE THE IMPLEMENTATION DATE AT /USE LOWER CASE/: 

    HTTP://PRODUCTS.WEATHER.GOV/VIEWLIST.PHP
A DETAILED DESCRIPTION OF THE GRAPHICAL AIRMET AND THE BUFR ENCODE/DECODE SCHEME IS AVAILABLE AT /USE LOWER CASE/: 

    HTTP://AVIATIONWEATHER.GOV/NOTICE/G-AIRMET
REAL-TIME EXAMPLES OF THE GRAPHICAL AIRMET ARE AVAILABLE AT /USE LOWER CASE/: 

    HTTP://AVIATIONWEATHER.GOV/PRODUCTS/GAIRMET/

FOR ADDITIONAL INFORMATION CONTACT:

    MICHAEL PAT MURPHY
    WARNING COORDINATION METEOROLOGIST
    AVIATION WEATHER CENTER
    KANSAS CITY MISSOURI
    816-584-7239
    MICHAEL.PAT.MURPHY@xxxxxxxx
NATIONAL TECHNICAL IMPLEMENTATION NOTICES ARE ONLINE AT /USE LOWERCASE/: 

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

$$
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