One skier was critically injured in Grand Teton National Park when an avalanche swept him 2,000 feet down the TNT Couloir in Granite Canyon. The skier triggered the 3-foot deep avalanche when he attempted to ski down the couloir.
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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 RIW wrote it up.
One skier was critically injured in Grand Teton National Park when an avalanche swept him 2,000 feet down the TNT Couloir in Granite Canyon. The skier triggered the 3-foot deep avalanche when he attempted to ski down the couloir.
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 25, 2:27 PM MST, 3 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE RIVERTON WY 227 PM MST SUN FEB 25 2007 .SHORT TERM...TONIGHT THROUGH WEDNESDAY ACTIVE PATTERN JUST BEGINNING AND WILL CONTINUE NOT ONLY THROUGH THE SHORT TERM PERIOD BUT LIKELY THROUGHOUT THE EXTENDED PERIOD. SHOULD BE A PERIOD OF ENHANCED SNOWFALL OUT WEST THIS EVENING AS WEAK SHORTWAVE LIFTS NORTHEAST ACROSS THE AREA COMBINED WITH ISENTROPIC UPGLIDE...QG ASCENT AND STEEP LAPSE RATES. HARD TO TIME THE BRIEF BREAKS BUT I SUSPECT THE BEST SNOWFALL RATES WILL BE THIS EVENING BUT SNOW WILL CONTINUE OVERNIGHT AND INTO MONDAY MORNING OUT WEST. BRIEF BREAK EXPECTED SOMETIME MONDAY OR MONDAY AFTERNOON WITH NEXT SHORTWAVE MOVING QUICKLY IN AROUND OR AFTER 00Z TUESDAY. SHOULD SEE ANOTHER SHOT OF AT LEAST MODERATE OR POTENTIALLY EVEN HEAVY SNOW IN THE WESTERN MOUNTAINS MONDAY NIGHT AND TUESDAY MORNING. THIS SYSTEM LOOKS TO HAVE EVEN MORE PUNCH THAN THIS SYSTEM. SOLID ADVISORY AMOUNTS ARE EXPECTED WITH SOME OF THE HIGHER PEAKS FLIRTING WITH 12 INCH WARNING AMOUNTS. EVEN THE FAR WEST VALLEYS AND BASINS WILL LIKELY GET ADVISORY AMOUNTS DURING THIS TIMEFRAME. THIS NEXT SYSTEM HAS THE COMBINATION OF CURVED JET STREAK MOVING IN OVERHEAD... INCREASING QG ASCENT...IMPRESSIVE EVENING ISENTROPIC LIFT AND FAVORABLY STEEP LAPSE RATES FOR THESE DYNAMICS TO WORK ON. ON TUESDAY...THIS SHORTWAVE BEGINS TO TRACK ACROSS THE FORECAST AREA WITH DEVELOPING FRONTOGENESIS IN THE CENTRAL ZONES. THE 20 TO 30 POPS WE HAVE EAST OF THE DIVIDE LOOKS GOOD FOR NOW. WEDNESDAY WILL BE COLD WITH LINGERING MOISTURE AND VERY STEEP LAPSE RATES. WE WILL LIKELY SEE PLENTY OF MOUNTAIN SNOW SHOWERS WITH SOME OF THESE MOVING ACROSS THE LOWER ELEVATIONS EAST OF THE DIVIDE IN THE AFTERNOON. .LONG TERM...WEDNESDAY NIGHT THROUGH SUNDAY COLD TROUGH REMAINS OVER THE REGION INTO THURSDAY. THEN NW FLOW ALOFT ON FRIDAY WITH POTENTIAL SHORTWAVE MOVING THROUGH THE FLOW. LONG RANGE MODELS DIFFER NEXT WEEKEND. ECMWF BRINGS THE RIDGE INTO THE WESTERN U.S. SATURDAY WITH NW FLOW OVER WY. GFS ALSO HAS RIDGE BUILDING INTO THE WEST AREA KEEPING NW FLOW BUT IT HAS A DEEPENING TROUGH QUICKLY UPSTREAM. THEN GFS SWINGS THIS TROUGH INTO THE WESTERN U.S. SUNDAY. GFS ENSEMBLES GET NOISY DURING THIS TIMEFRAME WHILE ECMWF DOES NOT INDICATE AN UPSTREAM TROUGH YET. WILL NOT MAKE MUCH CHANGE TO GOING FORECAST WED THROUGH FRI WITH BEST CHANCE OF SNOW IN THE MOUNTAINS WITH SOME LIGHT SNOW POSSIBLE LOWER ELEVATIONS ON WED AND THU. WILL SEE HOW THINGS LOOK TONIGHT FOR A CHANCE OF SNOW AT LOWER ELEVATIONS FRI. ADDED SLIGHT CHANCE OF SNOW TO NW MTS SATURDAY AND SAT NIGHT IN RESPONSE TO MOISTURE IN NW FLOW. HAVE OPTED TO LEAVE NEXT SUNDAY DRY AS GFS MAY BE TOO FAST WITH NEXT TROUGH. LOWERED TEMPS A FEW DEGREES WED THROUGH FRI WITH SOME WARMING NEXT SAT AND SUN. && .RIW WATCHES/WARNINGS/ADVISORIES...NONE. && SHORT TERM...SKRBAC LONG TERM...15
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE RIVERTON WY 205 PM MST SUN FEB 25 2007 WYZ001>020-022>030-261200- 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- 205 PM MST SUN FEB 25 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN AND CENTRAL WYOMING. .DAY ONE...TODAY AND TONIGHT LIGHT SNOW IS EXPECTED TO FALL ACROSS THE FAR WEST THROUGH TONIGHT WITH OCCASIONAL MODERATE SNOW IN THE MOUNTAINS. SNOWFALL AMOUNTS OF 3 TO 6 INCHES ARE EXPECTED IN THE MOUNTAINS WITH 1 TO 2 INCHES ACROSS THE LOWER ELEVATIONS. TRAVELLERS SHOULD BE PREPARED FOR SNOW COVERED ROADS. CHECK ROAD CONDITIONS BEFORE VENTURING OUT. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY A MOIST SOUTHWEST FLOW WILL IMPACT THE WESTERN MOUNTAINS AND VALLEYS MONDAY THROUGH TUESDAY WITH PERIODS OF SNOWFALL. SEVERAL EMBEDDED WEATHER DISTURBANCES WITHIN THIS FLOW WILL ENHANCE THE SNOWFALL AT TIMES INTO MONDAY MORNING AND AGAIN MONDAY NIGHT. SNOWFALL ESTIMATES FOR THE MONDAY TIMEFRAME ARE AROUND 2 TO 4 INCHES ACROSS THE WESTERN MOUNTAINS. ANOTHER STORM SYSTEM IS EXPECTED TO BRING MODERATE TO LOCALLY HEAVY SNOWFALL TO THE WESTERN MOUNTAINS MONDAY NIGHT AND TUESDAY MORNING WITH 5 TO 10 INCHES POSSIBLE IN THE MOUNTAINS AND 2 TO 4 INCHES ACROSS THE WESTERN VALLEYS AND BASINS. A COUPLE MORE WEATHER DISTURBANCES WILL MOVE IN FROM THE NORTHWEST WEDNESDAY NIGHT THROUGH SATURDAY FOR MORE WESTERN MOUNTAIN AND VALLEY SNOWFALL. STAY TUNED TO FURTHER STATEMENTS ON THIS STORMY WEATHER PATTERN. .SPOTTER INFORMATION STATEMENT... SPOTTERS IN WESTERN WYOMING ARE ENCOURAGED TO SUBMIT SNOWFALL REPORTS OVER THE NEXT SEVERAL DAYS. THANK YOU. TEAM RIVERTON
The national radar mosaic for the moment the first event began.
1 avalanche. 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: 10796.