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Where's the jet max: A dry band color enhancement technique
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1988
[PDF-2.38 MB]
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Description:"Where's the jet max?" In trying to assess the answer to this question, forecasters often analyze isotachs on upper air data charts, look at radiosonde information, or view modeled wind maxima. In recent years, forecasters have also learned how to use satellite imagery (VAS Moisture Channel imagery in particular) to infer the location of jet maxima. A color enhancement curve has been devised for SWIS which highlights dry bands in the Moisture Channel imagery. When one uses simplistic four-quadrant jet core theory and applies this dry band enhancement curve to a sequence of water vapor images on SWIS, the jet maxima often can be easily identified. In the few short weeks since the installation of SWIS, numerous cases have occurred in which jet maxima were identified and there was a good correlation with surface precipitation or pressure patterns. Thus, the dry band enhancement curve can be a valuable forecasting tool. Without it, this information might go unnoticed.
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