The National Weather Service in Riverton issued a hazardous weather outlook for central Wyoming.
Forecasters call for thunderstorms to form later this afternoon, with rain, strong gusts and small hail likely.
Chances of thunderstorms and gusty winds are again likely for Wednesday in Natrona County.
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Casper residents have been experiencing fall-like overnight conditions, with temperatures dipping into the low 40s.
Wyoming could experience snowfall tonight, with accumulations expected in the Wind River Mountains. Up to 4 to 10 inches are possible in elevations over 8,000 feet.