(Gregory Hirst, Oil City)

CASPER, Wyo. — As Casper gears up for an unsettled weather spell, the region is set to experience everything from afternoon thunderstorms to potential mountain snow by the week’s end. By Sunday, a shift toward warmer and more seasonal conditions is anticipated.

The National Weather Service in Riverton indicates that showers and thunderstorms will develop this afternoon and persist intermittently until Thursday night. This bout of inclement weather is attributed to an upper-level low from the Pacific Northwest, enhancing the southwest flow across the central Wyoming region.

For those planning to venture outdoors, Friday demands extra caution. A substantial drop in temperature, coupled with wetter air, marks the end of the week. Notably, snow is on the horizon, possibly appearing in elevations as low as 8,000 feet — barely within reach of Casper Mountain’s 8,130-foot elevation — by Friday night.

The silver lining emerges on Sunday, though, as the city starts to bask in warmth and dryness once again.

A detailed forecast for Casper:

Today: Prepare for scattered showers and thunderstorms, mainly after 5 p.m. Despite the impending storms, the sun will mostly hold its ground, allowing temperatures to reach around 76. Winds from the southwest are expected to breeze through at 15 mph, gusting up to 23 mph. The chance of rain is 30%.

Tonight: The evening might have some lingering thunderstorms, particularly before 9 p.m. As the night deepens, expect a mostly cloudy sky with the temperature dipping to around 47. Initial northeast winds at 6–11 mph will mellow down and shift direction after midnight.

Thursday: A mixed bag awaits with isolated showers and thunderstorms, mainly after noon. It will largely remain sunny with highs at 77. The light and variable morning wind will gradually shift to the southwest, moving at 5–8 mph.

Weekend: Casper will transition to a sunnier disposition on Sunday after a breezy and partly cloudy Saturday, which is set to have a high of around 63.

Sunday promises sunshine and warmth, soaring up to 72. Nighttime temperatures over the weekend will hover in the low 40s but aren’t predicted to reach the first freeze of the year.

Sept. 20 is Casper’s historical average for the first freeze of the year, although the first freeze has ranged anywhere from Aug. 23, recorded in 2015, to Oct. 28, recorded in 1940. Last year the first freeze occurred Sept. 11.