NOUS41 KWBC 101612



Public Information Statement, Comments Sought

National Weather Service Headquarters Washington DC

1113 AM EST Fri Jan 10 2014


To:        Subscribers:

           -Family of Services

           -NOAA Weather Wire Service

           -Emergency Managers Weather Information Network


           Other NWS Partners, Users and Employees


FROM:     Cyndie Abelman

          Chief, Aviation Services Branch


SUBJECT:  Soliciting Comments on the NWS Experimental Wind

          Compression Decision Support Graphic at the

          Fort Worth, TX, CWSU (ZFW) from January 10 through

          October 1, 2014


Effective Friday, January 10, 2014, at 1700 Coordinated

Universal Time (UTC) through October 1, 2014, a compression

decision support graphic will be posted to the CWSU ZFW web

portal. Aircraft traffic compression occurs when aircraft

flying Standard Terminal Arrivals (STARS), following one

behind the other, lose adequate horizontal separation from

each other. The conditions that create this situation are

usually a rapid change in wind direction and speed with

respect to altitude and between the two aircraft.


Traffic compression can occur when an aircraft, during descent,

transitions from a tailwind, or a weak headwind, to a stronger

headwind over a small change in altitude.  This change could also

occur with a heading change of the aircraft during its approach.


The Fort Worth CWSU (ZFW) has experimented with this product for

several years with favorable results. At the end of the comment

period, the Experimental Wind Compression Decision Support

Graphic will be evaluated for national availability.


The experimental decision support graphic customers include

personnel at the Air Traffic Control System Command Center

(ATCSCC), FAA ARTCC Traffic Management Unit, TRACON, airline

dispatchers, flight service specialists, CWSU meteorologists,

airlines and pilots. This experimental product is posted at:


NWS is seeking comments through through October 1, 2014.

Your feedback on this product is greatly appreciated.  Please

complete the survey at:


For more information concerning the ZFW compression decision

support experimental graphic, please contact:


  Tom Amis

  National Weather Service

  Center Weather Service Unit

  Fort Worth, TX 76155



Public Information Statements are online at: