CHEYENNE, Wyo. — Labor Day conditions should be mostly sunny with a slight chance of thunderstorms this afternoon ahead of cooler temps and moderate to heavy rain later in the week, according to the National Weather Service in Cheyenne.
Today, the NWS in Cheyenne forecasts a high near 87 degrees with southwest winds around 15 mph. There is a slight chance of showers and thunderstorms between 3 and 4 p.m. with a 20% chance of precipitation.
Red flag warnings are in effect for east-central Wyoming and the Nebraska Panhandle today and Tuesday due to low humidity values driven by hot temperatures, per the NWS in Cheyenne.
Tonight, conditions should change to mostly cloudy before gradually becoming clear with a low of around 54 degrees, the NWS in Cheyenne says. Winds should come from the south at 10–15 mph, shifting to the west after midnight.
Looking ahead to the rest of the week, high pressure dominating the weather pattern over southeast Wyoming and western Nebraska will begin moving south, the result of a mid- to upper atmospheric disturbance — or shortwave — progressing through the west coast, per the NWS in Cheyenne.
The west coast disturbance will be charging through the northern Rockies by Tuesday afternoon, with a frontal system dragging south through the Great Basin. The system could produce a few isolated thunderstorms, though they will be extremely high-based with any precipitation likely evaporating before reaching the surface, the NWS in Cheyenne says.
Conditions will be mild on Tuesday night, resulting in overnight lows around 5–10 degrees above average, per the NWS in Cheyenne. On Wednesday, though, a storm system will likely be moving into the area, bringing increased precipitation changes and cooler temps.
Expect moderate to heavy rain with any storms that develop and a stark decrease in high temperatures from Tuesday to Wednesday, according to the NWS in Cheyenne.
