4 heavy snow, as filed by the National Weather Service.
Every event with a place to put it; 2 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
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 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 26, 10:58 AM MST, 4 hours 32 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHEYENNE WY 1058 AM MST WED MAR 26 2003 .SHORT TERM...CALM BEFORE THE STORM. WINDS ARE BRISK ACROSS THE CWA AHEAD OF THE NEXT WEATHER MAKER. CLOUDS ALSO ON THE INCREASE. SOME LIGHT RAIN IN CONVERSE AND CARBON COUNTIES. CHANCE OF PRECIPITATION WILL CONTINUE TO INCREASE THE REMAINDER OF THE AFTERNOON AND EVEN MORE SO THIS EVENING. SHOULD SWITCH OVER TO ALL SNOW BETWEEN 06 AND 09Z. LOOKS LIKE WE COULD SEE SIGNIFICANT ACCUMULATIONS IN CONVERSE...NIOBRARA AND THE NORTHERN PANHANDLE AND WILL NO DOUBT UPGRADE WINTER STORM WATCH TO A WINTER STORM WARNING IN THESE AREAS. QUESTION IS HOW FAR SOUTH TO SPREAD THE WARNING. MAY ERR ON THE SIDE OF SAFETY AND WILL PROBABLY BRING IT ALL THE WAY THROUGH SOUTHEAST WYOMING AND THE SOUTHERN PANHANDLE. WEST OF THE MOUNTAINS MAY SEE THEIR HEAVIEST SNOW THIS EVENING INTO THE EARLY MORNING HOURS. .LONG TERM...COULD HAVE ANOTHER QUICK SHOT OF PRECIPITATION ON FRIDAY BUT THEN UPPER LEVEL RIDGE BUILDS OVER CWA OVER WEEKEND INTO MONDAY. RIDGE FLATTENS MONDAY AND TUESDAY AND COULD HAVE SOME LIGHT PRECIPITATION. RIDGE BEGINS TO POP UP AGAIN ON WEDNESDAY. .CYS... WINTER STORM WARNING LATE TONIGHT AND THURSDAY FOR AREAS EAST OF MOUNTAINS. WINTER STORM WATCH TONIGHT AND THURSDAY WEST OF MOUNTAINS. WINTER STORM WARNING FOR LATE TONIGHT AND THURSDAY WY ZONES...059-060-064-066>070 AND NE ZONES...001>003-019>021-054-055. WINTER STORM WATCH FOR TONIGHT AND THURSDAY WY ZONES...061.063-065. GRIFFITH
NEZ001>003-019>021-054-055-WYZ059>070-271200- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHEYENNE WY 513 AM MST WED MAR 26 2003 ...SNOW LIKELY LATER TONIGHT AND CONTINUING INTO THURSDAY... THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEASTERN WYOMING AND THE WESTERN NEBRASKA PANHANDLE. .DAY ONE...TODAY AND TONIGHT A DEVELOPING SPRING STORM WILL THREATEN PORTIONS OF SOUTHEAST WYOMING AND THE WESTERN NEBRASKA PANHANDLE LATE TODAY INTO TONIGHT. MANY AREAS WILL SEE RAIN OR RAIN SHOWERS CHANGING TO SNOW AFTER 9PM. SNOW ACCUMULATIONS UP TO 5 INCHES ARE POSSIBLE IN THE SOUTHEAST WYOMING MOUNTAINS TONIGHT. ACCUMULATIONS OF 1 TO 3 INCHES ARE POSSIBLE ON THE SOUTHEAST WYOMING PLAINS AND OVER THE WESTERN NEBRASKA PANHANDLE AFTER MIDNIGHT. THE STORM WILL BECOME ORGANIZED OVER NORTHEAST COLORADO BY TONIGHT AND BEGIN TO MOVE RAPIDLY EAST. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY SNOWS WILL END ACROSS SOUTHEAST WYOMING AND WESTERN NEBRASKA LATE THURSDAY. ACCUMULATIONS UP TO 10 INCHES TOTAL FROM THE STORM ARE POSSIBLE IN THE SOUTHEAST WYOMING MOUNTAINS...4 TO 6 INCHES ARE POSSIBLE OVER THE WYOMING PLAINS AND WESTERN NEBRASKA PANHANDLE. SKIES WILL BECOME PARTLY CLOUDY ON FRIDAY WITH WARMER AND BREEZY CONDITIONS EXPECTED BY THE WEEKEND. .SPOTTER INFORMATION STATEMENT... SPOTTERS SHOULD RELAY SNOWFALL INFORMATION TO THE NATIONAL WEATHER SERVICE IN CHEYENNE. WTP WCJIN-WYSE-WYNE
The national radar mosaic for the moment the first event began.
4 heavy snow. Local standard time, as filed.
Heavy snow fell over east-central sections of Wyoming, with snowfall amounts as high as 12 inches reported in the Lusk, WY. area. Other reported snowfall amounts included 8 to 10 inches in Wheatland, WY and around 8 inches in Douglas, WY.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wyoming in 2003Every state in 2003This day in weather historyWarnings in Wyoming, March 2003
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: 5347966, 5347967, 5347968, 5347969.