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@noaa.gov

 

For questions regarding the changes to LAMP guidance, contact:

 

  Judy Ghirardelli

  MDL/Silver Spring, Maryland

  301-713-0056, Ext. 194

  Judy.Ghirardelli@noaa.gov

 

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

 

$$