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A flash flood producing mesoscale convective complex
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1986
[PDF-5.00 MB]
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Description:In the early morning on August 3, 1985, locally heavy rainfall of up to six inches fell in a six to nine hour period over parts of the Little Blue River Basin in south central Nebraska. Fig. 1 shows the surface/sea level pressure map for 03Z on August 3rd at about the time convection developed in south central Nebraska. Since sea level pressure isobars are not to be trusted over the mountains and High Plains (see accompanying TA), surface geostrophic wind E9A(M,V)] charts for 21Z of the previous afternoon and 03Z are also shown as Figs. 2 and 3. Note the strong (40 knots and up) geostrophic winds in western Kansas and southwest Nebraska at 21Z. By 03Z these had subsided to 25 to 30 knots. The strong south geostrophic winds at 21Z represent a horizontal pressure force directed from the east. The resulting imbalance would accelerate the low level air parcels upslope, aiding in cloud and thunderstorm formation. A weak stationary front extended across the Kansas-Nebraska line. First period (Tonight) MOS PoP's were around 30 percent in the rain area.
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