Anatomy of High Winds Produced In Valentine
by Severe Thunderstorms

August 11th, 2012

Radar reflectivity image above at 1008 PM CDT on August 11th, 2012
Severe Thunderstorm moved across Valentine

A strong upper level disturbance, and a cold front advancing across western & north central Nebraska late Saturday afternoon and evening, brought severe weather to parts of the region on August 11th, 2012.

Storms moved east southeast from Bennett and Todd Counties in southern South Dakota - and into Cherry County Nebraska by late evening on August 11th.

By 910 PM CDT winds were gusting to 60 miles an hour 7 miles west northwest of Cody in Cherry County.  Another report of 60 MPH winds came from Nenzel at 930 PM CDT.

The strongest winds were reported from the automated surface observing station (ASOS) at Miller Field in Valentine.  A peak wind gust of 75 miles an hour occurred at the Valentine airport at 1012 PM CDT, with sustained winds of 62 miles an hour.

Rear Inflow Notch near Nenzel, Nebraska
Rear Inflow Notch near Nenzel, Nebraska at 936 PM CDT August 11th

(Click for larger scaled image above)

Rear Inflow Notch/Weak Echo Channel description

Slide from NWS Milwaukee -
(Image from: Przybylinski, R. W., 1995: The Bow Echo: Observations, Numerical Simulations,
and Severe Weather Detection Methods, Wea. Forecasting, 10, 187-202)

For a Windows Media Video radar animation
of thunderstorm striking Valentine - please click here

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