Deep low pressure in the Northern Plains and high pressure in the Great Basin combined to create a strong pressure gradient across Wyoming. Sustained wind of 40 to 50 mph with gusts of 60 to 70 mph were common.
Every event with a place to put it; 8 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 episode as NWS RIW wrote it up.
Deep low pressure in the Northern Plains and high pressure in the Great Basin combined to create a strong pressure gradient across Wyoming. Sustained wind of 40 to 50 mph with gusts of 60 to 70 mph were common. A peak peak gust of 90 mph was recorded on Chief Joseph Pass in Park County. Other notable peak gusts included 71 mph at Buffalo and 66 mph at both Riverton Regional Airport and Beaver Rim.
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 Riverton, WY wrote its last area forecast discussion before the first event at Feb 15, 2:04 PM MST, 5 hours 56 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE RIVERTON WY 204 PM MST THU FEB 15 2007 .SHORT TERM...TONIGHT THROUGH SUNDAY LIGHT SNOW FALLING OVER THE WESTERN SECTIONS OF THE STATE AS NEXT SYSTEM PUSHES IN FROM THE WEST. THIS STRONG PACIFIC TROUGH TO MOVE ACROSS THE AREA TONIGHT BRINGING GOOD ISENTROPIC LIFT TO THE WESTERN MOUNTAINS FOR A QUICK SHOT OF 3 TO 6 INCHES OVER THE AREA. MAY SEE SOME AREAS WITH LOCALLY HIGHER AMOUNTS OF 6 TO 8 INCHES BUT WITH ITS LOCALIZED AREAS WILL NOT ISSUE AN ADVISORY AT THIS TIME. THE MAIN PROBLEM OVER THE AREA WILL BE THE HIGH WINDS EXPECTED FRIDAY. WINDS TO INCREASE OVER THE FAVORED AREAS TONIGHT AS TROUGH MOVES ACROSS THE AREA. WINDS WILL INCREASE FRIDAY MORNING TO WARNING CRITERIA AS STRONG SUBSIDENCE OCCURS OVER THE BASINS AND MOUNTAINS EAST OF THE DIVIDE. WILL KEEP THE WATCH GOING AND WOULD EXPECT THE NIGHT CREW TO ISSUE THE WARNING CLOSER TO THE EXPECTED EVENT. HIGH PRESSURE TO MOVE INTO THE AREA BY SATURDAY INTO SUNDAY WITH DRY CONDITIONS AND WARMER TEMPERATURES. SOME AREA WILL SEE WARMER CONDITIONS FRIDAY AS WINDS BRING DOWN WARMER AIR ALOFT. WINDS TO DECREASE SATURDAY INTO SUNDAY WITH MOSTLY CLEAR SKIES UNTIL LATE SUNDAY WHEN THE NEXT SYSTEM STARTS TO MOVE INTO THE EASTERN MOUNTAINS OF IDAHO. .LONG TERM...SUNDAY NIGHT THROUGH THURSDAY UPPER RIDGE AXIS TO MOVE EAST OF WYOMING SUNDAY WITH TROUGH SPLITTING ALONG THE WEST COAST. THE NORTHERN STREAM WILL PRIMARILY AFFECT WYOMINGS WEATHER THROUGH THIS PERIOD WITH THE SOUTHERN STREAM STAYING WELL SOUTH OF THE AREA. THE FIRST NORTHERN STREAM SHORTWAVE IS FORECAST TO MOVE ACROSS THE NORTHERN ROCKIES MONDAY WITH A SECOND SHORTWAVE TO FOLLOW ON WEDNESDAY. THESE TWO DISTURBANCES WILL BRING CHANCES OF VALLEY RAIN AND MOUNTAIN SNOW ACROSS THE WESTERN MOUNTAINS AND FAR NORTH WITH BREEZY TO WINDY CONDITIONS PREVAILING ACROSS CENTRAL AND SOUTHERN WYOMING. AFTER THIS SECOND SHORTWAVE PASSAGE ON WEDNESDAY...WYOMING REMAINS UNDER A MILD SOUTHWEST FLOW WITH A TROUGH ACROSS THE EASTERN PACIFIC AND A BROAD RIDGE ACROSS THE CENTRAL U.S. THROUGH THURSDAY. THIS FLOW WILL CONTINUE TO BRING CHANCES OF VALLEY RAIN AND MOUNTAIN SNOW TO THE WEST WITH BREEZY TO WINDY AND UNSEASONABLY MILD FEBRUARY WEATHER EAST OF THE DIVIDE. && .RIW WATCHES/WARNINGS/ADVISORIES...HIGH WIND WATCH FRIDAY FOR MUCH OF WESTERN AND CENTRAL WYOMING FOR WYOMING ZONES 02...03...15>17... 19...28>30. && SHORT TERM...RIW LONG TERM...AEM
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE RIVERTON WY 204 PM MST THU FEB 15 2007 WYZ001>020-022>030-161200- ABSAROKA MOUNTAINS-BIGHORN MOUNTAINS SOUTHEAST- BIGHORN MOUNTAINS WEST-CASPER MOUNTAIN-CODY FOOTHILLS- EAST SWEETWATER COUNTY-FLAMING GORGE- GREEN MOUNTAINS AND RATTLESNAKE RANGE-JACKSON HOLE-LANDER FOOTHILLS- NATRONA COUNTY LOWER ELEVATIONS-NORTH BIG HORN BASIN- NORTHEAST JOHNSON COUNTY-OWL CREEK AND BRIDGER MOUNTAINS- ROCK SPRINGS AND GREEN RIVER-SALT RIVER AND WYOMING RANGES- SOUTH LINCOLN COUNTY-SOUTHEAST BIG HORN BASIN- SOUTHEAST JOHNSON COUNTY-SOUTHWEST BIG HORN BASIN-STAR VALLEY- TETON AND GROS VENTRE MOUNTAINS-UPPER GREEN RIVER BASIN- UPPER GREEN RIVER BASIN FOOTHILLS-UPPER WIND RIVER BASIN- WIND RIVER BASIN-WIND RIVER MOUNTAINS EAST-WIND RIVER MOUNTAINS WEST- YELLOWSTONE NATIONAL PARK- 204 PM MST THU FEB 15 2007 ...HIGH WIND WATCH FOR MUCH OF WESTERN AND CENTRAL WYOMING FRIDAY... THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN AND CENTRAL WYOMING. .DAY ONE...TODAY AND TONIGHT A POTENT PACIFIC WEATHER SYSTEM WILL DELIVER SNOW TO WESTERN WYOMING TODAY AND TONIGHT. 3 TO 5 INCHES OF SNOWFALL IS EXPECTED IN THE WESTERN VALLEYS TODAY THROUGH TONIGHT WITH LOCALIZED 6 TO 8 INCHES OF SNOW EXPECTED IN THE WESTERN MOUNTAINS...WITH MOST OF THE SNOWFALL EXPECTED TO FALL TONIGHT. WEST WINDS WILL INCREASE TONIGHT WHICH WILL LIKELY CAUSE SOME BLOWING AND DRIFTING SNOW ON THE PASSES. BE PREPARED FOR SLICK AND SNOW COVERED ROADS. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY VERY STRONG NORTHWEST WINDS ARE EXPECTED FRIDAY ACROSS MUCH OF THE AREA ALONG WITH THE POTENTIAL FOR 40 MPH WINDS AND GUSTS TO 60 MPH. IN SOME OF THE MOUNTAINS EXPECT THE POTENTIAL FOR 50 MPH WITH ALONG WITH GUSTS OF OVER 70 MPH FRIDAY. CONSIDERABLE BLOWING AND DRIFTING SNOW WILL LIKELY OCCUR AT THE HIGHER ELEVATIONS WHERE THE STRONG WINDS OCCUR. 2 TO 4 INCHES OF SNOWFALL IS EXPECTED IN THE BIG HORN MOUNTAINS FRIDAY WITH 1 TO 2 INCHES OF SNOWFALL IN NORTHERN JOHNSON COUNTY ALONG WITH BLOWING AND DRIFTING SNOW. MOST OF THIS SNOW WILL FALL FRIDAY MORNING. PATCHY FOG IS EXPECTED IN THE UPPER GREEN RIVER BASIN LATE FRIDAY NIGHT AND SATURDAY MORNING. SPOTTER INFORMATION STATEMENT... SPOTTERS ARE ENCOURAGED TO REPORT SNOW AMOUNTS. THANK YOU. TRIW
The national radar mosaic for the moment the first event began.
8 high wind. Local standard time, as filed.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wyoming in 2007Every state in 2007This day in weather historyWarnings in Wyoming, February 2007
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: 10868, 10876, 10874, 10870, 10871, 10869, 10872, 10873.