NTIM - FPCs to be abbreviated

• To: l.miller.ucar(rec)
• Subject: NTIM - FPCs to be abbreviated
• From: C.ALEX
• Date: Mon, 9 Aug 1993 13:38:03 -0600

Posted: Fri, Aug  6, 1993   3:39 PM EDT              Msg: MGJD-5834-9043
Subj:   NTIM - FPCs to be abbreviated                 
I sent the following NTIM this afternoon.  I plan to resend it 1-2 days before 
the implementation date.

WSHPNSNMC
NOUS41 KWBC 061835

NATIONAL TECHNICAL INFORMATION MESSAGE 93-31
NATIONAL WEATHER SERVICE HEADQUARTERS
235 PM EDT FRI AUG 6 1993

TO:         ALL NWS OFFICES, DOMESTIC DATA SERVICE SUBSCRIBERS

FROM:       MARY M. GLACKIN
            CHIEF, SERVICES DEVELOPMENT BRANCH

SUBJECT:    LFM-BASED MOS MESSAGE TO BE ABBREVIATED

(THE FOLLOWING INFORMATION WAS PROVIDED BY PAUL DALLAVALLE OF THE
TECHNIQUES DEVELOPMENT LABORATORY.)

Effective on or about the 1200 UTC cycle on August 18, 1993, the
National Weather Service will replace the current LFM-based MOS
forecast message for the contiguous United States with a modified
alphanumeric message.  The LFM-based MOS forecast message is
issued as the FPC product on AFOS and as the FOUS12 KWBC message
in the FAA's Weather Message Switching Center and the Family of
Service's Domestic Data Service.  The modified message will only
contain the 24-h through 60-h forecasts of the maximum/minimum
temperature and the probability of precipitation for 12-h periods
ending at 24, 36, 48, or 60 hours after initial model time.  All
of the other LFM MOS forecasts in the FPC/FOUS12 will be deleted
from the matrix.  Technical Procedures Bulletin No. 325 describes
the complete LFM MOS message.

NO CHANGES WILL BE MADE TO THE CURRENT FPC/FOUS12 KWBC PRODUCT
IDENTIFIERS NOR TO THE FORMAT OF THE MAX/MIN AND 12-H POP
FORECASTS.

Users of the FPC/FOUS12 guidance are encouraged to look at the
Nested Grid Model (NGM)-based MOS forecast message wherever the
LFM-based MOS guidance has been used in the past.  The NGM-based
MOS guidance is available as the FWC product on AFOS and as the
FOUS14 KWBC message in the FAA's Weather Message Switching Center
and the Family of Service's Domestic Data Service.  The NGM
MOS guidance contains forecasts of all weather elements that are
currently available in the FPC product, except quantitative
precipitation (QPF).  The QPF guidance should be added to the
FWC/FOUS14 KWBC message in late September or early October 1993. 
Technical Procedures Bulletin No. 408 describes the FWC/FOUS14
message.  The NGM MOS products are generally produced between 3
1/2 and 4 hours after 0000 or 1200 UTC.

This implementation of abbreviated FPCs is the final step leading
to the eventual discontinuation of the LFM MOS guidance as part
of the phase-out of the LFM.  We plan to discontinue the
abbreviated FPCs in Fall of 1993.

If you have any questions about this change, call Chris Alex of
the Office of Meteorology at (301-713-0462 or Paul Dallavalle at
(301)-763-8151. 

END