Periods of light to moderate snow fell across the Sierra Madre Range with snow accumulations around 8 inches.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS CYS wrote it up.
Periods of light to moderate snow fell across the Sierra Madre Range with snow accumulations around 8 inches.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Cheyenne, WY wrote its last area forecast discussion before the first event at Mar 28, 4:07 PM MST, 53 minutes earlier. Its key messages:
Area Forecast Discussion National Weather Service Cheyenne WY 507 PM MDT Fri Mar 28 2025 .KEY MESSAGES... - Unsettled pattern this weekend creating chances for a rain/snow mix for the lower elevations and advisory level snow for the mountains. - Active pattern next week bringing more chances for wind and precipitation. && .SHORT TERM /THROUGH SUNDAY/... Issued at 141 PM MDT Fri Mar 28 2025 An active weather pattern bringing much-needed springtime precipitation will be the main story throughout the short-term forecast period. Afternoon satellite imagery reveals increasing cloud cover throughout much of southeast Wyoming and western Nebraska this Friday afternoon. A broad trough located over the western CONUS continues inland with one particular wave of energy moving through the Great Basin/Central Rockies. This system will bring the first of two rounds of precipitation through our region this evening and through the overnight hours. Initial activity with this system will be widely scattered, with generally short bursts of rain and a rain/snow mix in the mountains due to a more convective mode as evidenced by a small amount of mid-level instability in forecast soundings. Short- term forecast soundings from high- res guidance indicate increasing saturation throughout the column later this afternoon and into the evening hours. As such, expect a transition to a steady light rain over the area overnight. A cold front is also expected to drop south through the high plains this evening, greatly reducing temperatures and increasing saturation in the post-frontal boundary layer. The interaction between this advancing frontal boundary from the north and increasing moisture from the west may result in one or two bands of heavier precipitation, generally along or just east of I-25 tonight. High- res forecast guidance has suggested the potential for this scenario in several iterations of guidance today for the overnight period. While spatial consistency of the location of heaviest rain remains quite varied, there is at least a 60 percent chance of greater than 0.3" of rain from this overnight system, with some locations possibly seeing 0.75 to 1" of liquid by Saturday morning. In the mountains, snowfall will generally be limited to locations above 9000 feet due to high snow levels. The Sierra Madre still looks to receive the most snow due to favorable upslope flow, where an advisory for over 6" of snow remains in effect. A brief period of NVA/subsidence moves through on Saturday late morning/early afternoon which will result in a lull in activity at this time over southeast Wyoming and far western Nebraska. However, quickly on the heels of the first wave comes a secondary mid- level low pressure system which will pass through the central Rockies/high plains Saturday evening through Sunday morning. This round of precipitation will likely be a bit more convective in nature due to several factors. Once cloud cover clears on Saturday afternoon in the wake of our first system, seasonably high boundary layer moisture will remain present. Any breaks in the cloud cover will result in strong solar heating. With seasonably high surface moisture present as well as cooler air aloft in place, low-end instability values on the order of 200-500 J/kg of SBCAPE could result in a few low-topped thunderstorms in both southeast Wyoming and far western Nebraska. One caveat to the convective forecast will be a more aggressive cold front with thicker cloud cover that limits daytime heating. Regardless, as the main mid-level low passes through on Saturday evening and overnight, scattered rain showers will mix with and eventually change to light snow as temperatures drop on Sunday morning. QPF totals will be more variable with this second round event given the scattered nature of precipitation, but a general 0.2 to 0.4" range of liquid totals is expected. Overall, much needed rainfall will give some drought relief to the entire area this weekend, with a chance that some locations may see close to or more than 1" of liquid east of the Laramie Range. Forecast confidence is moderate through the period with some uncertainty still remaining with regard to snowfall totals in the Snowy and Laramie Range foothills on Sunday morning. && .LONG TERM /SUNDAY NIGHT THROUGH FRIDAY/... Issued at 141 PM MDT Fri Mar 28 2025 Sunday...Even colder with 700 mb temperatures near -6 Celsius yielding high temperatures from the mid 30s to mid 40s. With nearly saturated low and mid levels, dynamics from a passing shortwave trough aloft and upslope, we will still see scattered to numerous showers, mostly snow, mainly in the morning. Monday...Turning breezy to windy, and warmer as the flow aloft turns westerly, inducing downslope winds. High temperatures mainly in the 50s. Enough moisture in the flow for some orographic showers over the mountains and nearby lower elevations. Tuesday...A progressive and fast moving shortwave trough aloft moves from Idaho to northern Wyoming during the day, with an associated cold frontal passage. Most of the lift with this system is progged to remain to our north, however, we will still see enough lift for scattered showers. Wednesday...Low amplitude shortwave ridging aloft builds across Wyoming. Will continue with a mention of a chance for mainly snow showers in the cyclonic flow aloft. Thursday...Relatively moist southwest flow aloft develops, helping to produce scattered showers, mainly over the mountains. Temperatures will also show a warming trend with 700 mb temperatures near -7 Celsius yielding maximum temperatures from the lower 40s west of I-25, to the upper 40s to mid 50s further east. Friday...Broad troughiness develops over our forecast area, and with adequate moisture aloft, we should see at least a chance of rain and snow in the cyclonic flow aloft, although the bulk of the precipitation looks to be off to our southeast. Continued seasonably cool with all the cloud cover. && .AVIATION /00Z TAFS THROUGH 00Z SUNDAY/... Issued at 459 PM MDT Fri Mar 28 2025 Southwest flow aloft will continue. A passing weather disturbance and cold front will bring widespread rain and snow to the region tonight and Saturday. Wyoming TAFS...Ceilings near 8000 feet will lower to 2500 feet after 04Z to 06Z, with light rain reducing visibilities to 4 miles, then ceilings will increase to 4000 to 8000 feet after 15Z Saturday. Winds will gust to 25 knots until 02Z. Nebraska TAFS...Ceilings will lower to 8000 feet after 01Z, then lower further to 2500 feet after 06Z, with light rain and fog reducing visibilities to 2 miles, then light snow will develop at Chadron and Alliance after 12Z, with light rain continuing at Scottsbluff and Sidney. After 19Z, ceilings will improve to 4000 to 5000 feet. Winds will gust to 34 knots until 01Z. && .CYS WATCHES/WARNINGS/ADVISORIES... WY...Winter Weather Advisory until noon MDT Saturday for WYZ112. NE...None. && SHORT TERM...MAC LONG TERM...RUBIN AVIATION...RUBIN
Hazardous Weather Outlook National Weather Service Cheyenne WY 119 PM MDT Fri Mar 28 2025 NEZ002-003-019>021-054-055-095-096-WYZ101>119-291930- Dawes County-Box Butte County-Scotts Bluff County-Banner County- Morrill County-Kimball County-Cheyenne County- Northern Sioux County-Southern Sioux County- Converse County Lower Elevations-Niobrara County- North Laramie Range-Ferris/Seminoe/Shirley Mountains- Shirley Basin-Central Laramie Range and Southwest Platte County- East Platte County-Goshen County-Central Carbon County- North Snowy Range Foothills-Southwest Carbon County- Sierra Madre Range-Upper North Platte River Basin-Snowy Range- Laramie Valley-South Laramie Range-South Laramie Range Foothills- Central Laramie County-East Laramie County- 119 PM MDT Fri Mar 28 2025 This hazardous weather outlook is for portions of panhandle Nebraska...east central Wyoming...south central Wyoming and southeast Wyoming. .DAY ONE...THIS AFTERNOON AND TONIGHT No hazardous weather is expected at this time. Isolated showers with some light snow in the higher terrain over 9000 feet is expected to develop by sunset. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY The probability for widespread hazardous weather is low. Expect some snow accumulations in the mountains of southeast Wyoming through the weekend. Lower elevations will see mainly rain, with a possible changeover to snow on Sunday. Expect an inch or less of snow in grassy areas outside of mountain locations. .Spotter information statement... Spotter activation will not be needed. Please report any snowfall to the NWS.
The national radar mosaic for the moment the first event began.
1 winter weather. Local standard time, as filed.
Several SNOTEL sites in the Sierra Madre Range reported between 6 to 9 inches of snow.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wyoming in 2025Every state in 2025This day in weather historyWarnings in Wyoming, March 2025
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 1242180.