National Weather Service United States Department of Commerce

Overview

A significant convective and flooding event occurred on the evening of July 6, 2010.  Three flash flood warnings were issued by the end of the event on the July 8, 2010.  During the late afternoon and evening of July 6, 2010, three tornado warnings and nine severe thunderstorm warnings were also issued. 

A cold front was positioned east to west along Interstate 80 from just north of Sidney to Laramie.  Thunderstorms developed just to the north and along this front.  A cold pool aloft which raised the concern of the possibility of bow echoes or squall lines developing in far eastern Wyoming and the panhandle along with heavy rainfall. Areas south of the Pine Ridge had received 2 to 4 inches of rain in recent days. The concern was that any additional rain would cause flooding problems and model QPF values were in the 0.75 to 1.25 inch range for this area.  It was stated that even heavier rainfall amounts could occur with the stronger storms.  It was stated that areas to the south of the Platte River Valley could see flash flooding with as little as a half an inch of rain due to the very saturated conditions.

Cloud Plume near Sidney

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Funnel descending from a wall cloud.

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Tornado near Lodgepole, NE

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Supercell entering Sidney, NE

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