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Weather News with J7409 Tuesday August 14,2018

842 views · Published 14 August 2018 · 11:06 · Indexed 23 September 2026

Channel: J7409 · 2018 · Science & Technology

Weather News with J7409 Tuesday August 14,2018.
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Marginally severe thunderstorms will be possible late this afternoon and early this evening across parts of Wyoming, southeast Montana, far western South Dakota and far western Nebraska. A shortwave trough will move eastward across the central and northern Rockies today. At the surface, upslope flow will be in place across much of the central and northern High Plains. In response, a narrow corridor of maximized low-level moisture is forecast to extend from western Nebraska into eastern Wyoming where surface dewpoints should be in the lower to mid 50s F. As surface heating takes place today, MLCAPE values are forecast to reach the 1000 to 1500 J/kg range along the moist corridor. Convection should initiate in the higher terrain during the afternoon with thunderstorms moving eastward into the lower elevations late this afternoon into early this evening. RAP forecast soundings at Sheridan and Casper at 00Z/Wednesday show 0-6 km shear in the 40 to 50 kt range with 0-3 km lapse rates approaching 9.0 C/km. This should be enough for an isolated severe threat. Marginally severe wind gusts will be possible with the stronger cells. Steep lapse rates in the mid-levels will also support a threat for hail.

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