970303: AVN/MRF changes & misc info (fwd)

• To: nws-changes@xxxxxxxxxxxxxxxx
• Subject: 970303: AVN/MRF changes & misc info (fwd)
• From: Linda Miller <lmiller@xxxxxxxxxxxxxxxx>
• Date: Mon, 3 Mar 1997 10:44:33 -0700 (MST)

Hi all--

There will be a few changes forwarded to the email list today that 
were received from the NWS during the past week, just in case you have
missed them.  Sorry they are a bit late.

FYI: Many of the changes are now being posted directly at a NWS Web Site.
 
See:

http://205.156.54.206/im/imuplist.htm

Unidata will continue to post these changes as long as there is need.  

Linda Miller                            
External Liaison                        Telephone: (303) 497-8646
UCAR/Unidata Program Center             Fax: (303) 497-8690             
P.O. Box 3000                           E-mail: lmiller@xxxxxxxxxxxxxxxx
Boulder, CO 80307-3000                  http://www.unidata.ucar.edu/

591 
NOUS01 KWBC 242010
MESSAGE 97-08

NATIONAL CENTERS FOR ENVIRONMENTAL PREDICTION /NCEP/ WILL BE
MOVING THE GENERATION OF THE 2.5X5 AND 5X5 DEG AVN/MRF
INTERNATIONAL GRIB PRODUCTS FROM THEIR HITACHI /HDS/ MAINFRAME
COMPUTER TO THE CRAY MAINFRAME ON TUES 4 MAR 1997.

THESE PRODUCTS NOW BEING GENERATED DIRECTLY FROM THE CRAY
FORECAST FILES WILL CONTAIN SEVERAL DIFFERANCES WHICH MUST BE
NOTED.

1. ALL PRODUCTS WILL NOW CONTAIN A GRID DEFINITION SECTION /GDS/.
OCTET 8 OF THE PRODUCT DEFINITION SECTION /PDS/ WILL BE CHANGED
TO REFLECT THIS CHANGE /HEXIDECIMAL 80 INSTEAD OF HEXIDECIMAL
00/.

2. PERIOD OF TIME /P1/ NOW OCCUPIES OCTETS 19 AND 20 INSTEAD OF
OCTET 20.

3. OCTET 21 WILL NOW CONTAIN A 10 /HEXIDECIMAL 0A/ INDICATING
THAT P1 OCCUPIES OCTETS 19 AND 20 PRODUCT VALID REFERENCE TIME
/PLUS/ P1 AS CODE IN THE WMO GRIB STANDARDS.

4. OCTETS 10-12 WILL BE MODIFIED FOR 4 PARAMETER TYPES THESE ARE
THE LEVEL INDICATORS / OCTET 10 / AND HEIGHT OF THE LEVEL OR
LAYER / OCTETS 11-12/ AS SPECIFIED BY THE SPECTRAL GLOBAL MODEL.

THE FIELDS CHANGED ARE -
PARAMETER                 FROM        TO
SFC TEMP TO 2 METER TEMP  010000      690002
BOUNDARY LVL RELATIVE HUMIDITY  6C2164  741E00
BOUNDARY LVL U-WIND       6C0064      741E00
BOUNDARY LVL V-WIND       6C0064      741E00

NCEP APOLOGIZES FOR THE SHORT WARNING ON THESE CHANGES.  THE HDS
COMPUTER WILL BE REMOVED FROM SERVICE ON 10 MAR 1997.  NCEP HAD
NOT PLANNED TO CONVERT THESE PRODUCTS TO THE CRAY BUT WAS ASKED
TO DO SO BECAUSE SOME OF THE SUBSCRIBERS HAVE NOT CONVERTED TO THE
1.25 DEG WAFS PRODUCTS.

RTH WASHINGTON SENDS