The National Weather Service has issued a flash flood warning for east-central Natrona County until 8:30 p.m.
This comes immediately after a severe thunderstorm warning in the area that already has caused up to two inches of rain.
Flash-flooding is expected to begin shortly.
Some locations that will experience flooding include sand spring creek, Pratt's Soda Lakes Draw, and Cole Creek.
Additional rainfall amounts of up to one inch are quite possible in the county.
At 4:55 p.m., a severe thunderstorm was located near Homa Hills about 12 miles north of Casper moving northwest at 15 mph.
Wind gusts up to 60 mph and quarter-size hail may occur. Hail damage to vehicles is expected. Wind damage also is expected to roofs, siding and trees.
This thunderstorm will be near Bar Nunn about 5 p.m., and Homa Hills and Antelope Hills about 5:15 p.m.
The warning was supposed to end at 5:45 p.m.
This area includes Interstate 25 between mile markers 191 and 218.
Large hail, damaging winds and continuous cloud-to-ground lightning is occurring with this storm. Move indoors immediately. Lightning is one of nature's leading killers. If you can hear thunder, you are close enough to be struck by lightning.
The NWS recommends moving to an interior room on the lowest floor of a building.
Likewise, torrential rainfall is occurring with this storm and may lead to flash-flooding. Do not drive your vehicle through flooded roadways.
To report severe weather, contact your nearest law enforcement agency, which will contact the National Weather Service.