19990308: NCEP Global Analysis Fcst Sys

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PUBLIC INFO. STATEMENT...TECHNICAL IMPLEMENTATION NOTICE 99-05
NATIONAL WEATHER SERVICE HEADQUARTERS WASHINGTON DC
800 AM EST MON MAR 8 1999

TO:       FAMILY OF SERVICES /FOS/ SUBSCRIBERS...NOAA WEATHER
          WIRE SERVICE /NWWS/ SUBSCRIBERS...OTHER NATIONAL
          WEATHER SERVICE /NWS/ CUSTOMERS...NWS EMPLOYEES

FROM:     LEROY SPAYD...CHIEF...SCIENCE AND TRAINING CORE

SUBJECT:  CHANGES TO THE NATIONAL CENTER FOR ENVIRONMENTAL
          PREDICTION /NCEP/ GLOBAL ANALYSIS/FORECAST
          SYSTEM...EFFECTIVE MAR 08 1999

BEGINNING WITH THE 1200 UTC GLOBAL MODEL RUN ON MAR 08 1999
...ADDITIONAL SATELLITE DATA WILL BE INCLUDED IN THE GLOBAL
ANALYSIS SYSTEM FOR BOTH THE AVIATION /AVN/ AND MEDIUM RANGE
FORECAST /MRF/ MODEL RUNS.  NEW DATA ARE RADIANCES FROM THE
NOAA-15 HIGH RESOLUTION INFRARED SOUNDER /HIRS/ NUMBER 3 /HIRS-3/
AND THE ADVANCED MICROWAVE SOUNDING UNIT /AMSU/ FOR TEMPERATURE
/AMSU-A/. REASONS FOR THE CHANGE ARE DATA AVAILABILITY...RECENT
LOSS OF THE NOAA-11 MICROWAVE SOUNDING UNIT DATA AND IMMINENT
LOSS OF NOAA-11 HIRS DATA. TESTING HAS SHOWN MINOR IMPACT IN THE
NORTHERN HEMISPHERE AND IMPROVED LARGE-SCALE FEATURES IN THE
SOUTHERN HEMISPHERE.

ON-LINE DOCUMENTATION IS AVAILABLE AT 
HTTP://SGI62.WWB.NOAA.GOV:8080/RTPUB...SEE NOAA-15
IMPLEMENTATION.../USE UPPER CASE FOR RTPUB/.  

ROUTINE MONITORING OF THE EFFECT OF THE NEW DATA WILL CONTINUE
AND FUTURE ADJUSTMENTS WILL BE MADE WHERE NECESSARY.              

IF YOU HAVE FURTHER QUESTIONS...CONTACT