20011126: Operational MesoEta changes TODAY-ADMIN NOTICE NOUS41 KWBC

• To: nws-changes@xxxxxxxxxxxxxxxx
• Subject: 20011126: Operational MesoEta changes TODAY-ADMIN NOTICE NOUS41 KWBC
• From: Linda Miller <lmiller@xxxxxxxxxxxxxxxx>
• Date: Tue, 27 Nov 2001 08:52:48 -0700

545
NOUS41 KWBC 271540
PNSWSH

PUBLIC INFO. STATEMENT ... TECHNICAL INFORMATION NOTICE 01-31
NATIONAL WEATHER SERVICE HEADQUARTERS WASHINGTON DC
1100 AM EST TUE NOV 26 2001

TO:       FAMILY OF SERVICES /FOS/ SUBSCRIBERS...NOAA WEATHER
          WIRE SERVICE /NWWS/ SUBSCRIBERS...EMERGENCY MANAGERS
          WEATHER INFORMATION NETWORK /EMWIN/ SUBSCRIBERS...
          OTHER NATIONAL WEATHER SERVICE /NWS/ CUSTOMERS AND
          PARTNERS...NWS EMPLOYEES

FROM:     PAUL NIPKO
          ACTING CHAIR...COMMITTEE ON ANALYSIS AND FORECAST
          TECHNIQUE IMPLEMENTATION /CAFTI/

SUBJECT:  CHANGES IMPLEMENTED IN THE NATIONAL CENTERS FOR
          ENVIRONMENTAL PREDICTION /NCEP/ OPERATIONAL MESO ETA
          MODEL SYSTEM...EFFECTIVE NOV 26 2001 AT 1200 UTC

AT 1200 UTC 27 NOVEMBER 2001....THE FOLLOWING CHANGES TO THE
OPERATIONAL MESO ETA MODEL WILL BE IMPLEMENTED:

- THE RESOLUTION OF THE MESO ETA MODEL IS BEING INCREASED
FROM 22 KM / 50 LEVELS TO 12 KM / 60 LEVELS

- THE ETA 3-DIMENSIONAL VARIATIONAL ANALYSIS HAS BEEN MODIFIED
TO ALLOW FOR THE USE OF NOAA-16 RADIANCES AND AMSU-B MOISTURE
CHANNELS FROM NOAA-15 AND NOAA-16

- A NEW GRID-SCALE CLOUD MICROPHYSICS SCHEME HAS BEEN PUT INTO
THE MESO ETA MODEL... WHICH ALLOWS FOR HIGHER FORECAST RELATIVE
HUMIDITY (DUE TO HIGHER CONDENSATION THRESHOLD)... REDUCES
OVERPREDICTION OF LIGHT PRECIPITATION AMOUNTS... INCLUDES
TURBULENT MIXING OF CONDENSATE (TO REDUCE LIGHT PRECIPITATION
IN THE EASTERN PACIFIC)...  IMPROVES UPPER-LEVEL CLOUD PREDICTION...
REDUCES GRID-SCALE PRECIPITATION "BULL-EYES"... IMPROVES FORECASTS
OF PRECIPITATION TYPE.. AND ELIMINATES SPURIOUS VERTICAL VELOCITY
FIELDS IN REGIONS OF HEAVY GRID-SCALE PRECIPITATION

- THE SCHEME WHICH ASSIMILATES HOURLY ANALYSES OF OBSERVED
PRECIPITATION DURING THE ETA DATA ASSIMILATION SYSTEM (EDAS)
RUN HAS BEEN REVAMPED TO MAKE IT COMPATIBLE WITH THE NEW CLOUD SCHEME

THIS CHANGE WAS APPROVED AT THE NOVEMBER 7 2001 MEETING OF THE
COMMITTEE ON APPLIED FORECASTING TECHNIQUES AND IMPLEMENTATION.
A COPY OF THE PRESENTATION MADE AT THAT MEETING IS AVAILABLE
ONLINE AT /USE LOWER CASE/:

FTP://FTP.NCEP.NOAA.GOV/PUB/EMC/WD20ER/CAFTI12KM/V3_DOCUMENT.HTM

VERIFICATION STATISTICS FOR THE REAL-TIME PARALLEL TESTS OF THE
FULL CHANGE PACKAGE CAN BE FOUND AT /USE LOWER CASE/

HTTP://WWW.EMC.NCEP.NOAA.GOV/MMB/MMBPLL/ETA12STATS.NEWCLOUD/

MORE DETAILS CAN BE FOUND IN  NWS TECHNICAL PROCEDURES BULLETIN
NUMBER 488 AT /USE LOWER CASE/:

HTTP://WWW.EMC.NCEP.NOAA.GOV/MMB/MMBPLL/ETA12TPB/

NO CHANGES TO ANY OF THE STANDARD ETA MODEL GRIDS OR PRODUCTS
AVAILABLE FROM THE FAMILY OF SERVICES... THE AWIPS SATELLITE
BROADCAST NETWORK... OR FROM THE OOS SERVER WILL BE MADE WITH
THIS IMPLEMENTATION

IF YOU HAVE ANY QUESTIONS ABOUT THESE CHANGES TO THE ETA
MODEL...PLEASE CONTACT:

     ERIC ROGERS
     PHONE :301-763-8000 EXT. 7227
     E-MAIL : ERIC.ROGERS@xxxxxxxx

     OR

     GEOFF DIMEGO
     PHONE:  301-763-8000 EXT. 7221
     E-MAIL: GEOFF.DIMEGO@xxxxxxxx

THIS AND OTHER NATIONAL TECHNICAL INFORMATION NOTICES ARE
AVAILABLE ON THE INTERNET AT /USE LOWER CASE/

          HTTP://205.156.54.206/OM/TPBPR.SHTML




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