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About the NCEP MMAB Experimental Coastal Visual Range Guidance

revised April 2, 2004; reviewed April 2, 2004.

The lowest layer visibility products are provided as a post-processed field direct from the eta model. This field is in m and has been converted to n mi on the depiction shown at this web page. This visibility field is created by using an algorithm developed by Stoelinga and Warner (1998) which takes into account clould liquid water, cloud frozen water, liquid precipitation, and frozen precipitation. This field was added as a part of an eta implementation which occurred in April 1998. This algorithm was upgraded in the implementation of July 8, 2003.

The U.S. and Gulf of Mexico depictions are derived from eta-12 fields on the AWIPS 212 grid and converted to a 0.25 by 0.25 degree lon/lat grid by GRADS. The Alaska depictions are derived from eta-12 fields on the AWIPS grid 216 and converted to a GRADS 0.25 x 0.25 degree lon/lat grid. For more information on the eta model see frequently asked questions about the eta.


Department of Commerce NOAA National Weather Service NCEP

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Page last modified: Friday, 07-Aug-2009 15:37:28 UTC