Flash Floods, Very Heavy Rain Possible Through Tonight

A rainy day from 2016.

EAST SWEETWATER COUNTY — The National Weather Service in Riverton has issued a special weather advisory for thunderstorms with very heavy rains possible this afternoon through tonight.

The advisory was issued at 12:10 PM on July 11.

Affected areas include East Sweetwater County and Wamsutter.

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Affected areas outside Sweetwater County include Wind River Basin, Lander Foothills,  Green Mountains and Rattlesnake Range, Natrona County Lower Elevations, Casper Mountain, and the cities of Riverton, Shoshoni, Lander, Jeffrey City, and Casper.

A very moist atmosphere combined with daytime heating and an approaching weather disturbance will help scattered to numerous showers and thunderstorms form around the area later this afternoon and continue well into the night.

There is a chance that these storms will turn into an area of very heavy rain with flash flooding potential.

The best chance of the heaviest rain appears to stretch from northeast Sweetwater County northeast into Eastern Fremont County and much of Natrona County.

The thunderstorms will form over the western part of the area,  potentially grow into area of heavy rain and thunderstorms and  then move east and northeast through Natrona County.

The storms will last the longest in Natrona County where they could continue  into the early morning hours.

There is still uncertainty as to how much and where the heaviest rain will fall but parts of this area could see 1 to 2 inches of rain.

Natrona County seems to have the highest likelihood of these amounts this evening and overnight.

Stay tuned for further statements and possible watches or warnings later today or tonight.