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Localized Aviation MOS Program

Notice of Flaw in GFS-LAMP Thunderstorm Forecasts



Attention LAMP users:

The GFS-based LAMP thunderstorm probability and categorical forecasts, which became official in the NWS on 25 July 2006, presently contain a noticeable problem. The problem consists of choppiness/roughness in the forecast patterns and a slight degradation in accuracy. A fix for the problem is presently scheduled for implementation on or about August 1st.

The following image is an example that contains the flaw. Problamatic TSTM Graphic The following image is an example of our fix. Corrected TSTM Graphic

Please let us know if you see any further problems or have any questions.

Thank you for your interest in LAMP.

Dr. Jerome Charba and Jerry Wiedenfeld


US Dept of Commerce
National Oceanic and Atmospheric Administration
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Page Last Modified: September 05, 2007. 16:40  UTC