A strong pressure gradient produced some strong wind gusts over parts of southeast Wyoming.
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.
A strong pressure gradient produced some strong wind gusts over parts of southeast Wyoming.
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 Feb 9, 3:41 AM MST, 1 hour 24 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHEYENNE WY 341 AM MST MON FEB 9 2009 .SHORT TERM...TODAY THROUGH TUESDAY... AN UPPER LOW WILL MOVE ACROSS THE CWA TODAY AND INTO CENTRAL NE BY THIS EVENING. MOISTURE WILL CONTINUE TO STREAM INTO THE AREA FROM THE SOUTH...ESPECIALLY OVER THE EASTERN HALF OF THE CWA. WILL KEEP A CHANCE OF SNOW IN THE FORECAST ACROSS THE AREA THIS MORNING...THEN A CHANCE OF RAIN EAST OF THE LARAMIE RANGE THIS AFTERNOON AND A CHANCE OF SNOW IN THE LARAMIE RANGE AND WEST. SURFACE WINDS SHOULD SHIFT TO THE WEST ACROSS THE ENTIRE AREA BY MID MORNING. WILL KEEP WINTER WEATHER ADVISORY IN EFFECT FOR ZONE 63. SURFACE LOW WILL MOVE INTO THE NORTHERN PLAINS TONIGHT AND SURFACE WINDS WILL SHIFT TO THE NW. DEEP MOISTURE WILL REMAIN OVER THE WEST AND NORTH SO WILL KEEP THE CHANCE OF SNOW IN THESE AREAS...WITH A SLIGHT CHANCE OF SNOW OVER THE EASTERN PORTION OF THE CWA. ON TUES...A DISTURBANCE WILL MOVE ACROSS THE AREA BY AFTERNOON. THIS WILL RESULT IN A CHANCE OF SNOW WEST OF THE LARAMIE RANGE AND NORTH...WITH A SLIGHT CHANCE OF SNOW EAST OF THE LARAMIE RANGE.. HIGH TEMPERATURES WILL BE FROM 5 TO 8 DEGREES ABOVE NORMAL TODAY AS WAA CONTINUES EAST OF THE SURFACE LOW UNTIL ITS TRANSIT EAST OF THE AREA. HIGHS WILL BE AROUND NORMAL ON TUESDAY. .LONG TERM...TUESDAY NIGHT THROUGH SUNDAY... AN ODD PATTERN TO BEGIN THE PERIOD WITH THREE CLOSED UPPER LOWS ALL LOCATED WEST OF THE MISSISSIPPI. THE FIRST WILL BE LOCATED NEAR THE NRN GREAT LAKES...THE 2ND NEAR THE TX PANHANDLE AND THE OTHER OFF THE PACIFIC NORTHWEST COAST. THERE WILL BE ONE MORE SHORTWAVE TROUGH EXTENDING SOUTH FROM ALBERTA THROUGH WESTERN WYOMING. THIS LAST FEATURE WILL PROVIDE MOUNTAIN SNOW CHANCES TUESDAY NIGHT. BY WEDNESDAY...FLOW WILL BACK TO THE SOUTHWEST OUT AHEAD AN UPPER CLOSED LOW THAT WILL SLIDE SOUTH ALONG THE PACIFIC COAST. ISENTROPIC LIFT COMBINED WITH MOIST WEST/SOUTHWEST OROGRAPHICS ON THE WEST SLOPE WILL CAUSE SOME LIGHT SNOW FOR WEDNESDAY AND THURSDAY. TEMPERATURES WILL BE RIGHT AROUND AVERAGE FOR WEDNESDAY AND THURSDAY...WITH 30S WEST...AND UPPER 30S TO LOW 40S EAST. ALL IN ALL THE SNOW IN THE MOUNTAINS ON WEDNESDAY AND THURSDAY WILL REMAIN LIGHT. THE UPPER LOW THAT WILL BE OFF THE NORTHERN CALIFORNIA COAST LATE WEDNESDAY...WILL OPEN AND PROGRESS EAST TOWARDS THE AREA ON THURSDAY. THE GFS IS THE FASTEST WITH THIS FEATURE...WHICH STRAYED FROM ITS ENSEMBLE MEAN. THE GFS ENSEMBLE MEAN ALIGNED ITSELF MORE WITH THE OPERATIONAL ECMWF. SO FAVORED THE ECMWF WITH THIS SYSTEM. BY FRIDAY MORNING...THE TROUGH WILL BE ACROSS SE COLORADO...WITH THE 700MB LOW LOCATED OVER EASTERN COLORADO. THIS COULD BE THE NEXT POTENTIAL SIGNIFICANT WEATHER EVENT ACROSS SOUTHEAST WY/WRN NEBRASKA AND WILL NEED TO KEEP CLOSE EYE ON SUBSEQUENT MODEL TRENDS. HAVE CONTINUED THE TREND OF INCREASING SNOW CHANCES ESPECIALLY IN THE MOUNTAINS AND ADJACENT FOOTHILLS FOR BOTH THURSDAY NIGHT AND FRIDAY. TEMPERATURES WILL BE COOLER ON FRIDAY AS WELL GIVEN EXPECTED BLANKET OF CLOUDS ACROSS THE AREA. SHORTWAVE RIDGING BUILDS IN FOR FRIDAY NIGHT THROUGH SUNDAY...WITH ANOTHER TROUGH POSSIBLY IMPACTING THE AREA EARLY NEXT WEEK. && .AVIATION... IFR CONDITIONS DUE TO LOW CIGS WILL OCCUR OVER THE SOUTHEAST CORNER OF WYOMING AND THE SOUTHERN NEB PANHANDLE UNTIL MID MORNING. AREAS OF MVFR CONDITIONS WILL PERSIST ACROSS MUCH OF THE AREA THROUGH TONIGHT DUE TO LOW CIGS AND VSBYS AS AN UPPER TROUGH MOVES ACROSS THE AREA. && .CYS WATCHES/WARNINGS/ADVISORIES... WY...WINTER WEATHER ADVISORY UNTIL 5 PM MONDAY FOR WYZ063. NE...NONE. && SHORT TERM/AVIATION...KMD LONG TERM...HAHN
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHEYENNE WY 503 AM MST MON FEB 9 2009 NEZ001>003-019>021-054-055-WYZ059>070-101215- SIOUX-DAWES-BOX BUTTE-SCOTTS BLUFF-BANNER-MORRILL-KIMBALL- CHEYENNE-CONVERSE-NIOBRARA-SOUTHWEST CARBON-NORTH CARBON- SNOWY RANGE-NORTH LARAMIE RANGE-LARAMIE VALLEY-LARAMIE RANGE- PLATTE-GOSHEN-CHEYENNE FOOTHILLS-PINE BLUFFS- 503 AM MST MON FEB 9 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE WESTERN NEBRASKA PANHANDLE AND SOUTHEAST WYOMING. .DAY ONE...TODAY AND TONIGHT AREAS OF FOG WILL PERSIST FROM ALLIANCE THROUGH SIDNEY THROUGH EARLY THIS MORNING...BUT WILL GRADUALLY DISSIPATE BY 8 AM. SNOW WILL CONTINUE TO FALL ACROSS THE SNOWY RANGE TODAY...WITH A TOTAL OF 5 TO 8 INCHES ANTICIPATED BY LATE THIS AFTERNOON. LIGHT SNOW CHANCES WILL CONTINUE FOR AREAS WEST OF THE LARAMIE RANGE TODAY AS WELL...WITH LIGHT RAIN CHANCES FOR AREAS EAST OF THE MOUNTAINS. WEST WINDS OF 20 TO 30 MPH WILL OCCUR WITH GUSTS UP TO 45 MPH TODAY. LOCALLY STRONGER WIND GUSTS WILL BE POSSIBLE IN AND AROUND HIGHER TERRAIN. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY PERSISTENT SNOW WILL CONTINUE ACROSS THE SNOWY RANGE AND SIERRA MADRES TUESDAY THROUGH THURSDAY. ANOTHER STRONGER SYSTEM WILL BRING A BETTER CHANCE OF ACCUMULATING SNOW TO THE REGION FOR THURSDAY NIGHT AND FRIDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY AND TONIGHT. && THIS PRODUCT...ALONG WITH OTHER WEATHER...HYDROLOGIC...AND CLIMATE INFORMATION IS AVAILABLE ON THE WEB AT... HTTP://WEATHER.GOV/CHEYENNE
4 high wind. Local standard time, as filed.
A few gusts up to 60 mph were recorded along Interstate 25 at the Bordeaux interchange.
A few gusts up to 65 mph were recorded along Interstate 25 at the Whitaker interchange.
Several gusts around 60 mph were recorded along Interstate 80 near the Vedauwoo exit.
Wind gust was recorded near Pine Bluffs, WY.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wyoming in 2009Every state in 2009This day in weather historyWarnings in Wyoming, February 2009
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: 145563, 145564, 145566, 145565.