NOTE: The nws-changes mailing list is no longer active. The list archives are made available for historical reasons.
-------- Original Message --------
101
NOUS41 KWBC 121103
PNSWSH
Technical Implementation Notice 13-30
National Weather Service Headquarters Washington DC
705 AM EDT Thu Sep 12 2013
To: Subscribers:
-Family of Services
-NOAA Weather Wire Service
-Emergency Managers Weather Information Network
-NOAAPORT
Other NWS Partners and Employees
From: Tim McClung
Science Plans Branch Chief
Office of Science and Technology
Subject: Update to GFS-based Model Output Statistics (MOS) Wind
Guidance and Resulting Changes to LAMP Wind Guidance
on or about October 22, 2013
On or about Tuesday, October 22, 2013, beginning with the 1200
Coordinated Universal Time (UTC) model cycle, the NWS
Meteorological Development Laboratory will implement new Global
Forecast System (GFS)-based Model Output Statistics (MOS) wind
speed and direction guidance for sites available in the short-
range (MAV) and extended-range (MEX) text bulletins. These new
equations correct bias changes in the GFS model upgrade
implemented May 10, 2011.
www.nws.noaa.gov/os/notification/tin11-07gfs_update_aaa.htm
Wind equations for the warm season (valid April 1 through
September 30) were updated on June 12, 2012.
http://www.nws.noaa.gov/om/notification/tin12-25gfs_mos-aaa.htm
These changes also will impact the GFS-based Localized Aviation
MOS Program (LAMP) beginning with the 1600 UTC cycle.
NWS is replacing cool season wind equations for the majority of
stations over CONUS, Alaska, Hawaii, Puerto Rico and Canada.
Three METAR sites in the West no longer report or do not contain
a sufficient number of wind observations from which to develop
new equations. Forecasts produced from the old equations are
significantly degraded. Guidance for wind direction and speed
are now missing for the following three sites for all cycles and
projections in the GFS MOS bulletins:
K3A6 Newhall, CA
KTDO Toledo-Winlock Memorial, WA
KVTP La Veta Mountain, CO
These changes will slightly alter the format of the GFS MOS text
products because lines for wind direction and speed will be
removed for the three sites listed above. As a result of the GFS
MOS change above, LAMP guidance for wind direction, speed, and
gusts will now be missing for those three sites for all cycles
and projections in the LAMP LAV bulletins and BUFR messages.
In addition, guidance for wind direction and speed has been
added for the following four Air Force sites for all cycles and
projections in the Air Force MAV and MEX bulletins:
K2DP Dare County Gunnery Range, NC
KBIF Biggs Army Airfield, TX
KBYS Bicycle Lake Army Airfield, CA
KL35 Big Bear City Airport, CA
These changes will slightly alter the format of the Air Force
MAV and MEX text products because lines for wind direction and
speed will be added for these four sites.
The tables below list the communication identifiers for all
products affected by these changes.
Table 1: Communication identifiers for the GFS-based MOS public
text products affected by the changes.
WMO HEADING AWIPS ID WMO HEADING AWIPS ID
(SHORT RANGE) (EXTENDED RANGE)
-------------------- ----------------------
FOPA20 KWNO MAVPA0 FEPA20 KWNO MEXPA0
FOUS21 KWNO MAVNE1 FEUS21 KWNO MEXNE1
FOUS22 KWNO MAVSE1 FEUS22 KWNO MEXSE1
FOUS23 KWNO MAVNC1 FEUS23 KWNO MEXNC1
FOUS24 KWNO MAVSC1 FEUS24 KWNO MEXSC1
FOUS25 KWNO MAVRM1 FEUS25 KWNO MEXRM1
FOUS26 KWNO MAVWC0 FEUS26 KWNO MEXWC0
Table 2: Communication identifiers for the affected Air Force
MOS text products
WMO HEADING AWIPS ID WMO HEADING AWIPS ID
(SHORT RANGE) (EXTENDED RANGE)
--------------------- ----------------------
FOUS30 KWNO MAVF26 FEUS30 KWNO MEXF26
Table 3: Communication identifiers for the GFS-based MOS BUFR
products affected by the changes
WMO HEADING WMO HEADING REGION
(SHORT RANGE) (EXTENDED RANGE)
------------ ----------- ------------------
JSML30 KWNO JSMT30 KWNO PACIFIC REGION
JSML31 KWNO JSMT31 KWNO NORTHEAST CONUS
JSML32 KWNO JSMT32 KWNO SOUTHEAST CONUS
JSML33 KWNO JSMT33 KWNO NORTH CENTRAL CONUS
JSML34 KWNO JSMT34 KWNO SOUTH CENTRAL CONUS
JSML35 KWNO JSMT35 KWNO ROCKY MOUNTAIN CONUS
JSML36 KWNO JSMT36 KWNO WEST COAST CONUS
Table 4: Communication identifiers for the GFS-based LAMP public
text product affected by the changes
WMO HEADING AWIPS ID
----------- --------
FOUS11 KWNO LAVUSA
Table 5: Communication identifiers for the GFS-based LAMP BUFR
products affected by the changes
WMO HEADING REGION
------------ ---------------
JSMF10 KWNO PACIFIC REGION
JSMF11 KWNO NORTHEAST CONUS
JSMF12 KWNO SOUTHEAST CONUS
JSMF13 KWNO NORTH CENTRAL CONUS
JSMF14 KWNO SOUTH CENTRAL CONUS
JSMF15 KWNO ROCKY MOUNTAIN CONUS
JSMF16 KWNO WEST COAST CONUS
For questions regarding the update to the GFS MOS wind guidance
and resulting changes to the MAV and MEX bulletins contact: Eric Engle MDL/Silver Spring, Maryland 301-713-0023, Ext. 146 Eric.Engle@xxxxxxxx For questions regarding the changes to LAMP guidance, contact: Judy Ghirardelli MDL/Silver Spring, Maryland 301-713-0056, Ext. 194 Judy.Ghirardelli@xxxxxxxx Links to the MOS products and descriptions are online at: http://www.nws.noaa.gov/mdl/synop NWS National Technical Implementation Notices are online at:http://www.weather.gov/os/notif.htm
$$
nws-changes archives: