NOUS41 KWBC 171500



Technical Implementation Notice 12-27

National Weather Service Headquarters Washington DC

100 PM EDT Thu May 17 2012


To:        Subscribers:

           -Family of Services

           -NOAA Weather Wire Service

           -Emergency Managers Weather Information Network


           Other NWS Partners, Users and Employees


From:      Tim McClung

           Chief, Science Plans Branch

           Office of Science and Technology


Subject:   Upgrade to Automated Sea Ice Concentration Analysis

           Effective June 19, 2012


On or about Tuesday June 19, 2012, the National Centers for Environmental Prediction will make the following changes to the Automated Sea Ice Concentration Analysis to improve performance:


1. Use a weather filter not dependent on the 22 GHz channel of

   the F-15 satellite. That channel is known to be contaminated

   by instrumental cross-talk. This change will reduce the

   misdiagnosis of points as being weather-contaminated, and

   hence unusable, or to falsely use points as sea ice that are

   actually weather.


2. Include passive microwave observations from DMSP F-17 SSMI-S

   in sea ice concentration analysis to do the following:


  - Use a new sensor type (SSMI-S rather than SSMI)

  - Use a much younger instrument (5 years versus the 13 of F-15)

  - Prepare for use of continuing satellite series (F-18 launched

    2009, F-19 and F-20 scheduled for launch) with the same



Data format, volume, and delivery will not be affected by this implementation.


The Ice Concentration analysis products are available on the NCEP Server at



where YYYYMMDD corresponds to the four digit year, two digit month and two digit day.


The data are also available on NOAAPORT with the WMO headers EEWA88 KWBN, OEXA88 KWBN, OENA88 KWBN, OESA88 KWBN.


For more information on ice concentration analysis, see The Environmental Modeling Center (EMC) Website:


For questions regarding the scientific content of the Sea Ice Concentration Analysis please contact:


Robert Grumbine


Camp Springs, MD 20746

301-763-8000 x7214


NWS National Technical Implementation Notices are online at: