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Multiple Rain Opportunities Over Mother’s Day Weekend

May 7th, 2021
A second system over the weekend that forms over Wyoming will quickly move south, bringing cold...
A second system over the weekend that forms over Wyoming will quickly move south, bringing cold conditions to kick off the second week of May. The forecast temperature trend for Southeast Wyoming continues to drop, raising the chances for snow to be seen instead of rain.(KGWN)
Updated: May. 7, 2021 at 12:34 PM CDT
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The end of the first week of May brings the warmest temperatures of the week as the sun heats things into the upper 70s and lower 80s across the board. Cloud cover is making a gradual return through the day, coming from the west as the ridge over the Western US begins to break down. The arrival of the next system has begun, and while the state of Wyoming still needs plenty of help with drought conditions, with Mother’s Day being this weekend the timing of this system could be better. Regardless, it is coming, and by the time next week arrives a few locations might be looking at more snow instead of rain.

Saturday is when the cold front will push through the state: the ridge will break down as a trough propagates in from the west, bringing a low pressure system with it. As the cold front arrives, wind direction will shift from the west and southwest to the north, bringing in colder temperatures from the north. As the cold air arrives, thunderstorms are expected along the cold front, primarily affecting the northern half of the state. Timing looks to be during the lunchtime and afternoon hours, with an initial wave of colder rain possible in the northern counties along the Montana border early in the morning. The chances of the southern third of Wyoming seeing rain during the daylight hours is slim, however the wind will make itself known along the I-80 corridor. Strong breezes in the northern half of the state as the cold front arrives, but sustained speeds are likely to be over 30 mph from the west along I-80 in places like Rock Springs, Rawlins, Laramie, and Cheyenne well ahead of the cold front. Rain will likely arrive during the early overnight hours for these locations.

Sunday will be even colder, especially for the southern third of the state as the next system begins to setup. Folks with Mother’s Day plans in Casper or Riverton further north are seeing the rain chances for Sunday drop, which should allow for more outdoor plans to celebrate Mom. A light jacket may be necessary, however; highs are expected to be in the mid 50s for that region of the state, and a bit warmer further north. The attention now turns to the southeastern corner of the state, as a low generating over Central Wyoming will quickly push south, bringing rain showers to the region beginning during the late lunchtime hours. A few rumbles of thunder may be possible at first, however dropping temperatures will quickly put a stop to that as the low begins to intensify once it reaches Colorado. Lows for Sunday night will be approaching the freezing point, with some places like Laramie dropping below it.

Monday is the day to watch for snow: the forecast temperature trend, especially in Cheyenne, continues to get lower and lower. A couple of days ago the high in Cheyenne for Monday looked to be in the upper 40s, now heading into the weekend that has dropped into the upper 30s. If it get’s much lower Cheyenne will be looking at a persistent wet and heavy snow falling through the afternoon on Monday instead of a cold rain. Laramie will be seeing snow on Monday. Further north where the influence of the low is weaker in places like Casper rain is still expected, however not quite as much. As of now Casper is expected to remain in the mid to upper 40s Monday afternoon, keeping the precipitation as rain during the daylight hours. All rain is expected to shift into snow during the overnight hours Monday into Tuesday as temperatures drop to freezing and the low begins to move out of the region. On Tuesday things will still be chilly, but should warm up enough to where lingering precipitation is mainly rain (with the exception of places like Laramie in higher elevations). Tuesday should also a be a bit calmer and lighter with the precipitation, with most of it tapering off by the evening hours.

Sunshine and warmer conditions should return by next Wednesday with a warming trend taking over into the following weekend.

CHEYENNE, Wyo. (Wyoming News Now) -

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