NOUS41 KWBC 031535
PNSWSH

TECHNICAL IMPLEMENTATION NOTICE 08-70
NATIONAL WEATHER SERVICE HEADQUARTERS WASHINGTON DC
1135 AM EDT WED SEP 3 2008

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

FROM:     KEVIN JOHNSTON
          CHIEF... AVIATION SERVICES BRANCH       

SUBJECT:  ELIMINATION OF ROUTINE USE OF ABOVE GROUND LEVEL /AGL/
          IN AVIATION WEATHER CENTER ISSUED CHICAGO AND
          DALLAS-FORT WORTH AREA FORECASTS:
          EFFECTIVE NOVEMBER 5 2008

NOTE: THE FOLLOWING CHANGES HAVE NO IMPACT ON NOAA WEATHER
WIRE SUBSCRIBERS.

ON WEDNESDAY NOVEMBER 5 2008 THE AVIATION WEATHER CENTER WILL 
CEASE ROUTINELY USING ABOVE GROUND LEVEL /AGL/ FORECAST CLOUD 
HEIGHTS IN ALL PORTIONS OF THE CHICAGO AND DALLAS-FORT WORTH 
AREA FORECASTS. THE CLOUD HEIGHTS IN THE CHICAGO AND DALLAS-FORT 
WORTH AREA FORECASTS WILL BECOME MEAN SEA LEVEL /MSL/ TO BE 
CONSISTENT WITH THE BOSTON...MIAMI...SALT LAKE CITY...AND SAN 
FRANCISCO AREA FORECASTS. 

IN LIMITED SITUATIONS AND AT FORECASTER DISCRETION CLOUD HEIGHTS 
IN AREA FORECASTS MAY BE ISSUED AS AGL AND LABELED AS SUCH.

PRODUCTS AFFECTED BY THE CHANGE FROM AGL TO MSL ARE: 
  CHI AREA FORECAST WMO HEADER FAUS43 KKCI
  DFW AREA FORECAST WMO HEADER FAUS44 KKCI

FOR QUESTIONS CONCERNING THIS CHANGE...PLEASE CONTACT:

  PAT MURPHY
  WARNING COORDINATION METEOROLOGIST
  AVIATION WEATHER CENTER
  KANSAS CITY MISSOURI
  PHONE: 816-584-7239 
  E-MAIL: MICHAEL.PAT.MURPHY@NOAA.GOV

TECHNICAL IMPLEMENTATION NOTICES ARE ONLINE AT /USE LOWER CASE/:

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

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