20000925: MesoEta -ADMIN NOTICE NOUS41 KWBC (fwd)

• To: nws-changes@xxxxxxxxxxxxxxxx
• Subject: 20000925: MesoEta -ADMIN NOTICE NOUS41 KWBC (fwd)
• From: Linda Miller <lmiller@xxxxxxxxxxxxxxxx>
• Date: Mon, 25 Sep 2000 13:01:13 -0600

625
NOUS41 KWBC 251848
PNSWSH

PUBLIC INFO. STATEMENT ... TECHNICAL INFORMATION NOTICE 00-21
NATIONAL WEATHER SERVICE HEADQUARTERS WASHINGTON DC
250 PM EDT MON SEP 25 2000

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 NCEP OPERATIONAL MESO ETA MODEL SYSTEM

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

AT 1200 UTC SEPTEMBER 26 2000 ... A SERIES OF CHANGES TO THE
OPERATIONAL MESO ETA MODEL FORECAST SYSTEM WILL BE IMPLEMENTED:

1.  THE RESOLUTION OF THE MESO ETA FORECAST MODEL WILL BE
INCREASED FROM 32 KM AND 45 LEVELS...TO 22 KM AND 50 LEVELS.  THE
SIZE OF THE ETA MODEL INTEGRATION DOMAIN WILL BE INCREASED TO
THE SIZE OF THE 48 KM DOMAIN THAT WAS OPERATIONAL FROM
OCTOBER 1995 TO FEBRUARY 1998.  THIS CHANGE IN THE ETA-22 DOMAIN
WILL PLACE THE WESTERN BOUNDARY 900 KM FURTHER WEST OF HAWAII THAN
IN THE CURRENT ETA-32.

2. THE ETA 3-DIMENSIONAL VARIATIONAL ANALYSIS /3DVAR/ WILL BE
MODIFIED TO MAKE DIRECT USE OF RADIANCES FROM THE GOES SATELLITES
AND THE NOAA POLAR-ORBITING SATELLITES.

3. A NEW OBSERVATIONAL NON-LINEAR QUALITY CONTROL ALGORITHM WILL
BE INCORPORATED INTO THE ETA 3DVAR ANALYSIS...REPLACING THE
GROSS CHECK OF OBSERVATIONS AGAINST THE FIRST GUESS WHICH WAS
PREVIOUSLY USED.

4. THE VERTICAL ADVECTION OF CLOUD WATER WILL BE ADDED TO THE
ETA MODEL.  THIS WILL REDUCES THE AREA OF VERY LIGHT PRECIPITATION
FORECAST BY THE ETA MODEL IN THE EASTERN NORTH PACIFIC.

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 OSO SERVER WILL BE MADE WITH
THIS IMPLEMENTATION.  WITH THE INCREASE IN VERTICAL RESOLUTION
FROM 45 LEVELS TO 50 LEVELS ... THE HOURLY MODEL PROFILE DATA
/PACKED IN BUFR FORMAT/ WILL NOW CONTAIN AS MANY AS 50 VERTICAL
LEVELS.

FURTHER DETAILS ON THESE CHANGES CAN BE FOUND ONLINE IN THE DRAFT
TECHNICAL PROCEDURES BULLETIN AT:

     HTTP://SGI62.WWB.NOAA.GOV:8080/ETA22TPB/

WHERE ALL LETTERS SHOULD BE TYPED AS LOWER CASE EXCEPT ETA22TPB.

A PRESENTATION MADE TO THE SEPTEMBER 6 2000 MEETING OF THE
COMMITTEE ON APPLIED FORECASTING TECHNIQUES AND IMPLEMENTATION ON
THESE CHANGES IS ALSO AVAILABLE ONLINE AT / USE LOWER CASE / :

FTP://FTP.NCEP.NOAA.GOV/PUB/EMC/WD22DK/ETA22CAFTI/INDEX.HTML

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

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

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

          HTTP://WWW.NWS.NOAA.GOV/OM/NOTIF.HTM

END


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