Potent Spring Storm bringing much needed snow Mon/Tue

The National Weather Service
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Summary | Forecast | Monitoring & Reporting Snowfall | Safety

A potent storm system will move over Utah/Colorado Monday and Tuesday and could potentially bring some much needed precipitation to portions of central and southern Wyoming. Precipitation will start out as a rain/snow mix Monday morning, but will change over to snow through the day as a cold front progresses southward through the state. As the system progresses eastward over Colorado during the Monday night into Tuesday, winds over the area will become northeasterly, providing favorable upslope conditions to locations such as, Casper Mountain and the Lander Foothills. Precipitation will end from west to east during the day on Tuesday, before finally exiting Natrona county by late Wednesday night.

Models remain in good agreement with this storm system and forecast the needed ingredients for a favorable upslope event. No major changes with the forecast at this time. 




The above animation shows the accumulated snowfall forecast from the Weather Prediction Center (formally known as the HPC). The loop shows the expected snowfall accumulation in 6 hour time steps beginning at 18Z Saturday (Noon) and ending at 00Z Thursday (6pm Wednesday).

The WPC uses a blend of model solutions to come up with the loop based on which model(s) seem to be handling this particular storm the best, so this can be a particularly useful tool for storms that are not handled well by all models.

The above loop shows the amount of snow expected to accumulate over time. It does not take into account how warm the surface is or how wet snow may melt and condense. However it is useful to see how the storm progresses and when the snow will accumulate the fastest with particular emphasis on where most of the snow will accumulate rather than get caught up in specific amounts.

Image Key:

Light Purple = Less than 1 inch of snow accumulation

Gray = 1 to 2 inches

Yellow = 2 to 3 inches

Blue = 3 to 6 inches

Purple = 6 to 12 inches

Red = One Foot or More


Here are the latest forecasted snowfall totals for this event. As always, these are subject to change. The amounts above are derived from model data and perhaps represent the worst (or best depending on how you look at it) case scenario based on the available moisture and dynamics.

South Pass: 15-18 inches

Casper: 6-12 inches (higher amts in South Casper and as much as 2 feet on Casper Mountain)

Lander: 12 inches (higher amounts around Sinks Canyon and Red Canyon)

Fort Washakie: 7-10 inches

Jeffrey City: 5-8 inches

Buffalo: 5-8 inches

Hudson: 5-7 inches

Rock Springs: 4-6 inches

Riverton: 3-6 inches

Kemmerer: 3-6 inches

Thermopolis: 3-6 inches



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