Riverton, WY – Temperatures soaring into the 90s are rapidly melting high-elevation snowpack across western and central Wyoming, with minor flooding already possible in mountain creeks through Monday morning.
According to the National Weather Service in Riverton, warm conditions on Sunday will accelerate snowmelt, especially above 9,500 feet, with widespread highs in the 80s and low 90s. Afternoon thunderstorms and gusty winds up to 30 mph may further raise flood risk in low-lying areas and near creeks.
Mountain runoff could impact areas near the Absaroka, Wind River, and Bighorn Mountains, including Jackson Hole, Cody, and Thermopolis. The Green River and Wind River basins may also see minor flooding. Hydrologists expect peak streamflow Sunday night into early Monday, particularly in Sweetwater, Fremont, and Johnson counties.
Drivers should avoid flooded roads and report rising water to local authorities. Crews are monitoring drainage areas, and residents near creeks should secure valuables and stay alert.
A cooler, wetter pattern moves in Monday night through Wednesday, with chances for showers and even mountain snow above 10,000 feet.
⚠️ Hazardous Weather Outlook remains in effect. More advisories may follow as flooding risks evolve.
🗓️ Wyoming 5-Day Weather Snapshot (Riverton-Based)
- Sunday: Sunny, high near 92°F. Evening storms possible.
- Monday: Mostly cloudy, 74°F. Breezy with isolated showers (30–40%).
- Tuesday: High 62°F, showers likely (50%).
- Wednesday: Chance of showers, high 68°F.
- Thursday: Sunny, high 76°F.
