The combination of strong winds aloft and low pressure over the Central Plains generated high winds through the Southeast Wyoming wind corridors. Gusts of 60 to 80 mph were observed.
Every event with a place to put it; 22 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 CYS wrote it up.
The combination of strong winds aloft and low pressure over the Central Plains generated high winds through the Southeast Wyoming wind corridors. Gusts of 60 to 80 mph were observed.
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 Nov 30, 10:02 PM MST, 1 hour 58 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHEYENNE WY 1002 PM MST MON NOV 30 2015 .UPDATE... ISSUED AT 822 PM MST MON NOV 30 2015 MAIN CONCERNS TONIGHT ARE THE WINDS IN THE WINDY CORRIDORS OF SOUTHEAST WYOMING...AND THE POTENTIAL FOR LIGHT SNOW OVER THE NEBRAKSA PANHANDLE. CONCERNING THE WINDS...IT CONTINUES TO LOOK LIKE A MARGINAL HIGH WIND EVENT WITH SUSTAINED SOUTHWESTERLY WINDS 30 TO 40 MPH WITH GUSTS BETWEEN 50 AND 60 MPH. THE STRONGEST WINDS SHOULD BE THROUGH THE SOUTHERN LARAMIE RANGE AND FOOTHILLS AS THAT IS WHERE THE CORE OF STRONGEST WINDS WILL BE LOCATED TONIGHT. COULD EVEN SEE SOME GUSTS TO AROUND 65 MPH THROUGH THIS AREA BY LATE TONIGHT AND EARLY TUESDAY. SNOW ACROSS SOUTH DAKOTA CONTINUES TO SLIDE SOUTHWESTWARD TOWARD THE NEBRASKA PANHANDLE. BECOMING LESS EXCITED ABOUT THE POTENTIAL FOR ACCUMULATIONS OUTSIDE OF THE PINE RIDGE TONIGHT AND EVEN THERE SNOW MAY STRUGGLE TO ACCUMULATE MUCH SNOW. THIS IS LARGELY BASED ON THE FACT THAT WESTERLY LOW LEVEL FLOW CONTINUES TO ADVECT DRY AIR INTO THE PANHANDLE. SO DESPITE THE MID LEVELS BECOMING SATURATED...PRECIPITATION WILL CONTINUE TO FALL INTO DRY AIR WITH A LOT OF PRECIPITATION EVAPORATING BEFORE REACHING THE GROUND. AT ANY RATE...ANY SNOW ACCUMULATIONS IN THE PANHANDLE WILL BE MINIMAL AT BEST TONIGHT WITH LITTLE IMPACT TO TRAVEL. SNOW CHANCES WILL RAPIDLY DECREASE TOWARD SUNRISE TUESDAY MORNING. && .SHORT TERM...(THIS EVENING THROUGH WEDNESDAY EVENING) ISSUED AT 300 PM MST MON NOV 30 2015 FORECAST CONCERNS IN THE SHORT TERM DEAL WITH WINDS AS DEPARTING LOW TO EAST AND INCOMING HIGH FROM WEST CREATE A STRONG PRESSURE GRADIENT OVER THE AREA. CURRENTLY...SURFACE LOW OVER EASTERN NEBRASKA THIS AFTERNOON WITH WRAP AROUND MOISTURE MAKING ITS WAY TO THE NORTHWEST OF THE LOW INTO THE NORTHERN PANHANDLE AND PARTS OF EAST CENTRAL WYOMING. TO OUR WEST...A 1032MB SURFACE HIGH RESIDES OVER SOUTHERN IDAHO AND NORTHERN UTAH. 20Z CRAIG TO CASPER PRESSURE GRADIENT STANDS AT ROUGHLY 4MBS. WINDS AT ARLINGTON ARE QUITE GUSTY THIS AFTERNOON. GETTING REPORTS OF 45MPH OUT THERE AND OVER THE SOUTH LARAMIE RANGE. 18Z 700MB WINDS OFF THE GFS STANDS AT 30KTS OUT BY ARLINGTON AND 40KTS OVER THE SOUTHERN LARAMIE RANGE. BY 06Z TONIGHT...GFS 700MB WINDS INCREASE TO 45KTS AT ARLINGTON AND 60KTS OVER THE SOUTH LARAMIE RANGE. 06Z CRAIG TO CASPER 850MB/700MB HEIGHT GRADIENTS INCREASE TO 51MTRS/47MTRS RESPECTIVELY FROM 27MTRS/35MTRS AT 18Z TODAY. GOING TO BE REAL CLOSE AT ARLINGTON...WITH REPORTS OF 40-45MPH OUT THERE NOW...AND A FORECAST INCREASE IN WINDS THIS EVENING...FELT THERE WAS A GOOD CHANCE AT ARLINGTON HITTING HIGH WINDS FOR AT LEAST A BRIEF TIME TONIGHT. ADDED ZONE 110 INTO THE HIGH WIND WARNING AND MOVED UP THE START TIME TO 05Z. 700MB WINDS PEAK OUT AT 12Z TUESDAY WITH 50KTS AT ARLINGTON AND 65KTS OVER THE SOUTH LARAMIE RANGE. WE THEN START TO SEE THE WINDS BECOMING MORE NORTHWESTERLY AND SLOWLY DECREASE BY 18Z. WE MAY BE ABLE TO DROP BORDEAUX OUT OF THE WARNING AFTER 12Z...BUT DECIDED TO KEEP THEM GOING THROUGH NOON AT THIS TIME IN CASE THE WINDS DO NOT SHIFT NORTHWESTERLY AS EARLY AS THE GFS FORECASTS. ONE LAST TOPIC FOR TONIGHT...MODELS IN GOOD AGREEMENT WITH THE NORTHERN PANHANDLE GETTING A PRETTY GOOD SNOW UP THAT WAY. DID INCREASE POPS UP THAT WAY INTO NORTHERN SIOUX AND EASTERN NIOBRARA COUNTY. FORECAST SNOW ACCUMULATIONS REMAIN BELOW ADVISORY CRITERIA AT 1 TO 1.5 INCHES...BUT THE EVENING SHIFT WILL PROBABLY WANT TO MONITOR CLOSELY FOR POSSIBLE UPGRADES. LOOK FOR WARMER TEMPERATURES AS GFS 700MB TEMPERATURES CLIMB FROM -12 TO -14C TODAY...TO -8C TUESDAY AND -1C WEDNESDAY. SHOULD SEE HIGHS BACK ABOVE FREEZING TUESDAY AND WEDNESDAY AFTERNOON WITH HIGHS WEDNESDAY POSSIBLY IN THE MID 40S EAST OF THE LARAMIE RANGE. .LONG TERM...(THURSDAY THROUGH MONDAY) ISSUED AT 300 PM MST MON NOV 30 2015 UPPER-LEVEL RIDGING WILL DOMINATE THE CENTRAL CONUS EARLY IN THE FORECAST PERIOD. LARGE SCALE SUBSIDENCE AND WARMING TEMPERATURES ALOFT SHOULD YIELD PLEASANT WEATHER CONDITIONS AT THE CONCLUSION OF THE WORK WEEK FOR MUCH OF THE CWA. LOW-LEVEL GRADIENTS SHOULD NOT BE PARTICULARLY STRONG EITHER...SO DO NOT EXPECT WINDS TO BE ALL THAT STRONG OUTSIDE OF THE TYPICALLY WINDY AREAS. THE GFS IS THE MOST OPTIMISTIC WITH H7 TEMPS CLIMBING ABOVE +4 DEG C ALONG/E OF THE LARAMIE RANGE BY FRI AFTERNOON...WHILE THE ECMWF/GEM ARE A BIT COOLER AROUND +2 DEG C. EITHER WAY...WIDESPREAD HIGHS OF 50+ WILL BE A GOOD BET WITH WEAK DOWNSLOPE IN PLACE ACROSS THE HIGH PLAINS. THE MEDIUM RANGE MODELS ARE IN GOOD AGREEMENT WITH A FAST MOVING SHORTWAVE TROUGH AFFECTING THE AREA BY FRI NIGHT/SAT. THIS SYSTEM APPEARS MUCH TOO DRY TO YIELD ANY PRECIP...BUT IT SHOULD RESULT IN COOLER AND WINDIER WEATHER FOR SATURDAY. DRY WEATHER CONDITIONS WILL PREVAIL THROUGH THE REMAINDER OF THE PERIOD. && .AVIATION...(FOR THE 06Z TAFS THROUGH 06Z TUESDAY NIGHT) ISSUED AT 957 PM MST MON NOV 30 2015 MAINLY VFR ACROSS THE FORECAST AREA TONIGHT. THE EXCEPTIONS WILL BE IN THE SNOWY AND SIERRA MADRE RANGES AND ADJACENT AREA WHERE SOME LIGHT SNOW AND LOWER STRATUS WILL PRODUCE IFR TO MVFR. THE SAME GOES FOR NORTHERN PORTIONS OF THE WESTERN NEBRASKA PANHANDLE WHERE SOME LIGHT SNOW WILL FALL TONIGHT. AGAIN IFR TO MVFR FOR THIS AREA TONIGHT. CONDITIONS WILL IMPROVE ACROSS THE AREA INTO TUESDAY MORNING WITH VFR DEVELOPING EVERYWHERE. WINDS WILL BE STRONG ACROSS MUCH OF SOUTHEAST WYOMING...ESPECIALLY THE WIND PRONE AREAS WHERE GUSTS OF 45 TO 60 MPH WILL BE COMMON TONIGHT THROUGH TUESDAY MORNING. GUSTY WINDS WILL ALSO OCCUR INTO THE WESTERN NEBRASKA PANHANDLE WITH GUSTS TO 45 MPH LIKELY BY TUESDAY AFTERNOON. && .FIRE WEATHER... ISSUED AT 300 PM MST MON NOV 30 2015 STRONG WINDS THIS AFTERNOON AND ESPECIALLY TONIGHT AS HIGH PRESSURE BUILDS INTO THE AREA FROM THE WEST. FORTUNATELY...THERE IS ADEQUATE SNOW COVER AND COLD TEMPERATURES ARE WIDESPREAD TO PRECLUDE AND FIRE WEATHER IMPACTS. MAY NEED TO RECONSIDER TOWARDS MID WEEK AS WARMER TEMPERATURES OCCUR OVER SOUTHEAST WYOMING THAT WILL END LOW LEVEL SNOW COVER. STILL...AFTERNOON HUMIDITIES WEDNESDAY INTO FRIDAY ARE STILL IN THE MID TO UPPER 20 PERCENT RANGE...SO FIRE WEATHER CONCERNS SHOULD BE MINIMAL. && .CYS WATCHES/WARNINGS/ADVISORIES... WY...HIGH WIND WARNING UNTIL NOON MST TUESDAY FOR WYZ106-110-116-117. NE...NONE. && UPDATE...SML SHORT TERM...GCC LONG TERM...CLH AVIATION...SML FIRE WEATHER...GCC
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHEYENNE WY 402 PM MST MON NOV 30 2015 WYZ103>105-107-109-111>115-118-012315- NORTH LARAMIE RANGE-FERRIS/SEMINOE/SHIRLEY MOUNTAINS- SHIRLEY BASIN-EAST PLATTE COUNTY-CENTRAL CARBON COUNTY- SOUTHWEST CARBON COUNTY-SIERRA MADRE RANGE- UPPER NORTH PLATTE RIVER BASIN-SNOWY RANGE-LARAMIE VALLEY- CENTRAL LARAMIE COUNTY- 402 PM MST MON NOV 30 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EAST CENTRAL WYOMING...SOUTH CENTRAL WYOMING AND SOUTHEAST WYOMING. .DAY ONE...THIS AFTERNOON AND TONIGHT NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY WINDY CONDITIONS ARE EXPECTED MAINLY TUESDAY MORNING WITH SOME WIND GUSTS IN EXCESS OF 45 MPH POSSIBLE. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TONIGHT. NEZ002-003-019>021-054-055-095-096-WYZ101-102-108-119-012315- DAWES-BOX BUTTE-SCOTTS BLUFF-BANNER-MORRILL-KIMBALL-CHEYENNE- NORTH SIOUX-SOUTH SIOUX-CONVERSE COUNTY LOWER ELEVATIONS- NIOBRARA COUNTY-GOSHEN COUNTY-EAST LARAMIE COUNTY- 402 PM MST MON NOV 30 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF WESTERN NEBRASKA...EAST CENTRAL WYOMING AND SOUTHEAST WYOMING. .DAY ONE...THIS AFTERNOON AND TONIGHT NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TONIGHT. WYZ106-110-116-117-012315- CENTRAL LARAMIE RANGE AND SOUTHWEST PLATTE COUNTY- NORTH SNOWY RANGE FOOTHILLS-SOUTH LARAMIE RANGE- SOUTH LARAMIE RANGE FOOTHILLS- 402 PM MST MON NOV 30 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EAST CENTRAL WYOMING...SOUTH CENTRAL WYOMING AND SOUTHEAST WYOMING. .DAY ONE...THIS AFTERNOON AND TONIGHT WINDY CONDITIONS ARE EXPECTED TO DEVELOP LATER TONIGHT WITH GUSTS OVER 60 MPH POSSIBLE. HIGH WIND WARNINGS ARE IN EFFECT FROM 10 PM THIS EVENING THROUGH TUESDAY MORNING. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY WINDY CONDITIONS WILL CONTINUE ESPECIALLY IN THE MORNING WITH HIGH WINDS LIKELY THROUGH NOON. HIGH WIND WARNINGS ARE IN EFFECT THROUGH NOON TUESDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TONIGHT.
The national radar mosaic for the moment the first event began.
22 high wind. Local standard time, as filed.
The UPR sensor at Emkay measured wind gusts of 58 mph or higher, with a peak gust of 79 mph at 01/0451 MST.
The WYDOT sensor at Otto Road measured sustained winds of 40 mph or higher, with a peak gust of 68 mph at 01/0430 MST.
The WYDOT sensor at Arlington measured sustained winds of 40 mph or higher, with a peak gust of 65 mph at 01/0055 MST.
The WYDOT sensor at Bordeaux measured sustained winds of 40 mph or higher, with a peak gust of 63 mph at 01/0450 MST.
The UPR sensor at Buford measured sustained winds of 40 mph or higher, with a peak gust of 67 mph at 01/0255 MST.
The WYDOT sensor at Arlington East measured sustained winds of 40 mph or higher, with a peak gust of 63 mph at 01/0400 MST.
The WYDOT sensor at Lone Tree measured sustained winds of 40 mph or higher, with a peak gust of 65 mph at 01/0410 MST.
The WYDOT sensor at Buford East measured wind gusts of 58 mph or higher, with a peak gust of 67 mph at 01/0450 MST.
The WYDOT sensor at Foote Creek measured sustained winds of 40 mph or higher, with a peak gust of 63 mph at 01/0310 MST.
The WYDOT sensor at Vedauwoo measured sustained winds of 40 mph or higher, with a peak gust of 60 mph at 01/0255 MST.
The UPR sensor at Lynch measured sustained winds of 40 mph or higher, with a peak gust of 65 mph at 01/0355 MST.
The WYDOT sensor at Wildcat Trail measured sustained winds of 40 mph or higher, with a peak gust of 65 mph at 01/0355 MST.
The WYDOT sensor at Interstate 80 mile post 353 measured sustained winds of 40 mph or higher, with a peak gust of 62 mph at 01/0505 MST.
The WYDOT sensor at Cooper Cove measured peak wind gusts of 58 mph.
The Speer UPR sensor measured sustained winds of 40 mph or higher, with a peak gust of 61 mph at 01/0455 MST.
The WYDOT sensor at Wyoming Hill measured sustained winds of 40 mph or higher, with a peak gust of 62 mph at 01/0500 MST.
The WYDOT sensor at Halleck Ridge measured sustained winds of 40 mph or higher, with a peak gust of 58 mph at 01/0850 MST.
The WYDOT sensor at Rock River measured a peak wind gust of 60 mph.
The UPR sensor at Dale Creek measured wind gusts of 58 mph or higher, with a peak gust of 64 mph at 01/0725 MST.
The WYDOT sensor at County 402 measured sustained winds of 40 mph or higher, with a peak gust of 59 mph at 01/0705 MST.
The WYDOT sensor at Whitaker measured sustained winds of 40 mph or higher.
The WYDOT sensor at Wildcat Trail measured sustained winds of 40 mph or higher, with a peak gust of 63 mph at 01/1425 MST.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wyoming in 2015Every state in 2015This day in weather historyWarnings in Wyoming, December 2015
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: 614564, 614566, 614550, 614548, 614557, 614549, 614559, 614556, 614553, 614561, 614560, 614562, 614565, 614551, 614567, 614569, 614554, 614555, 614558, 614552, 614568, 614563.