A forecast of SSEC-CIMSS Simulated ABI Band 08 Water Vapor imagery valid at 12z Wed (above) showed two strongly sheared areas, indicative of two upper level jets moving across the upper Midwest. The southern strong water vapor gradient over southern Minnesota is properly positioned when compared to the 12Z TUE GFS 300-200mb wind speed forecast valid at 12Z Wed (below). There is another strong water vapor gradient apparent at the base of the upper level trough, which is also well-placed when comparing it to model data. The simulated water vapor imagery serves as a proxy for identifying and tracking the evolution of upper level jets without having to rely solely on model data.
Submitted by Marcia Cronce (NWS) and Dan Hartung (CIMSS).
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