During the overnight hours of the 29th outflow from isolated thunderstorms produced high winds across the area.
Every event with a place to put it; 1 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.
During the overnight hours of the 29th outflow from isolated thunderstorms produced high winds across the area.
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 Jun 29, 5:36 PM MST, 3 hours 20 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHEYENNE WY 636 PM MDT TUE JUN 29 2010 .AVIATION UPDATE... FOR THE 00Z TAFS. VFR CONDITIONS EXPECTED AS A STRONG UPPER LEVEL HIGH PUSHES EAST OF THE REGION TONIGHT. OUTSIDE OF A STRAY THUNDERSHOWER AT KRWL...DRY CONDITIONS ARE EXPECTED THROUGH TONIGHT. && .PREV DISCUSSION... /ISSUED 253 PM MDT TUE JUN 29 2010/ SHORT TERM...TONIGHT THROUGH WEDNESDAY... SIMILAR PATTERN TO YESTERDAY WITH TEMPERATURES A BIT WARMER THAN YESTERDAY...HOWEVER AS THE HIGH PRESSURE MOVES EASTWARD MOISTURE WILL BE ADVECTED INTO THE WESTERN CWA. VIS SATELLITE IS ALREADY SHOWING SHOWERS DEVELOPING DUE TO THE ADDED MOISTURE. THESE SHOWERS AND THUNDERSTORMS SHOULD END BY 9PM TONIGHT. WINDS WILL BE GUSTY THIS AFTERNOON...MOSTLY OVER THE PANHANDLE AS A LEE TROUGH DEVELOPS. OTHERWISE NO OTHER MAJOR CHANGES MADE TO THE SHORT TERM. LONG TERM...WEDNESDAY NIGHT THROUGH TUESDAY... UPPER HIGH WILL BE LOCATED NR THE MISSOURI RIVER VALLEY WEDNESDAY EVENING...WITH SOUTHWEST FLOW OVER THE NRN ROCKIES. MOISTURE WILL ROTATE AROUND THE PERIPHERY OF THE UPPER HIGH AND INTO THE CWA...MAINTAINING EVENING CONVECTION WEDNESDAY. MODEL SOUNDINGS DEPICT A DRY SUB-CLOUD LAYER...SO HAVE CONTINUED THE MENTION OF GUSTY WINDS WITH THESE ISOLATED THUNDERSTORMS...WHICH WILL EXIST WEST OF A CHEYENNE TO LUSK LINE WEDNESDAY. UPPER HIGH WILL SHIFT FURTHER EAST INTO THE MISSISSIPPI RIVER VALLEY BY THE THURSDAY/FRIDAY TIMEFRAME. MEANWHILE...A SHARPENING LEE SIDE SFC PRESSURE TROUGH AT THE SFC IN REFLECTION OF THE PACIFIC NW H5 SHORTWAVE...WILL ENHANCE LOW LEVEL CONVERGENCE ALONG THE SRN WY MOUNTAINS. AS A RESULT...CONVECTION SHOULD INCREASE IN COVERAGE SOMEWHAT...AND OVERSPREAD AREAS EAST OF THE LARAMIE RANGE... ESPECIALLY ON FRIDAY. SBCAPES WILL INCREASE INTO THE 700 TO 1200 J/KG RANGE THURSDAY AFTERNOON AND MORESO FRIDAY. ADDITIONALLY... MID/UPPER-LEVEL FLOW WILL BE ON THE INCREASE THURSDAY INTO FRIDAY WHICH WILL AID STORM ORGANIZATION. MEDIUM RANGE GUIDANCE CONTINUES TO VARY ON THE TIMING OF THE AFOREMENTIONED PAC NW SHORTWAVE OPENS AND MOVES ACROSS THE NRN ROCKIES...WITH THE GFS STILL QUICKEST...AND GEM THE SLOWEST. THE ECMWF CONTINUES TO BE A GOOD MIDDLE OF THE ROAD SOLUTION AND HAVE AGAIN FAVORED ITS TIMING. SO...EXPECT FROPA FROM NORTH TO SOUTH DURING THE DAY ON SATURDAY. THE FRONTAL TIMING WILL BE CRITICAL IN SATURDAYS HIGH TEMPERATURES AND THUNDERSTORM POTENTIAL. THE SHORTWAVE TROUGH AXIS WILL SWING THROUGH SATURDAY NIGHT...GIVING WAY TO MORE ZONAL AND DRIER FLOW FOR SUNDAY THROUGH TUESDAY. TEMPERATURES WILL RUN SEVERAL DEGREES ABOVE NORMAL AT LEAST THROUGH FRIDAY...WITH A RETURN TO NR NORMAL READINGS FOR SATURDAY THROUGH THE FIRST OF NEXT WEEK. AVIATION... FOR THE 18Z TAFS...EXPECTING SOME CUMULUS TO DEVELOP OVER THE RWL AND LAR AREAS TODAY AS THE RIDGE MOVES EASTWARD BRINGING MOISTURE UP FROM THE SOUTH. LAR WILL SEE MORE CLOUD COVER DUE TO THE CUMULUS FIRING OFF OF THE SNOWY RANGE. AS FOR THE TAF SITES IN THE PANHANDLE...GUSTY WINDS ARE IN STORE FOR THESE SITES AS A LEE SIDE TROUGH DEVELOPS DURING THE AFTERNOON CAUSING THE WINDS TO PICK UP. THOUGHT A FEW CUMULUS WOULD DEVELOP OVER THE PANHANDLE DUE TO SURFACE HEATING. HOWEVER A LACK OF MOISTURE WILL CAUSE ONLY A FEW CUMULUS...IF ANY...TO FORM. FIRE WEATHER... A BROAD AREA OF HIGH PRESSURE WILL TRACK FROM NEARLY DIRECTLY ATOP THE DISTRICT THIS AFTERNOON INTO THE MISSOURI RIVER VALLEY BY LATE WEDNESDAY. A FEW THUNDERSTORMS WILL CONTINUE THROUGH SUNSET FOR AREAS ALONG AND WEST OF THE LARAMIE RANGE. DRY CONDITIONS BELOW THESE ISOLATED SHOWERS/STORMS WILL PRODUCE GUSTY OUTFLOW WINDS. A BETTER COVERAGE OF THUNDERSTORMS CAN BE EXPECTED DURING THE AFTERNOON/EARLY EVENING HOURS EACH DAY WEDNESDAY THROUGH FRIDAY...AS THE UPPER HIGH CONTINUES TO MIGRATE EAST. MINIMUM RELATIVE HUMIDITIES WILL GENERALLY BE IN THE 15 TO 25 PERCENT RANGE THROUGH THE WEEK. TEMPERATURES WILL CONTINUE TO RUN 5 TO 10 DEGREES ABOVE NORMAL. THE NEXT COLD FRONT WILL MOVE INTO THE DISTRICT DURING THE DAY ON SATURDAY. HYDROLOGY... THE LOWER NORTH PLATTE RIVER AT HENRY AND MITCHELL NEBRASKA WILL CONTINUE TO EXPERIENCE RIVER STAGES ABOVE FLOOD STAGE...DUE TO RELEASES FROM UPSTREAM RESERVOIRS. FLOOD WARNINGS CONTINUE FOR THE LOWER NORTH PLATTE AT HENRY UNTIL FURTHER NOTICE AND MITCHELL UNTIL FRIDAY AFTERNOON. && .CYS WATCHES/WARNINGS/ADVISORIES... WY...NONE. NE...NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHEYENNE WY 302 PM MDT TUE JUN 29 2010 NEZ002-003-019>021-054-055-095-096-WYZ101-102-106>108-117>119- 302115- DAWES-BOX BUTTE-SCOTTS BLUFF-BANNER-MORRILL-KIMBALL-CHEYENNE- NORTH SIOUX-SOUTH SIOUX-CONVERSE COUNTY LOWER ELEVATIONS- NIOBRARA COUNTY-CENTRAL LARAMIE RANGE AND SOUTHWEST PLATTE COUNTY- EAST PLATTE COUNTY-GOSHEN COUNTY-SOUTH LARAMIE RANGE FOOTHILLS- CENTRAL LARAMIE COUNTY-EAST LARAMIE COUNTY- 302 PM MDT TUE JUN 29 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE WESTERN NEBRASKA PANHANDLE...SOUTHEAST WYOMING. .DAY ONE...THIS AFTERNOON AND TONIGHT NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY ISOLATED THUNDERSTORM CHANCES WILL SPREAD FROM WYOMING ON WEDNESDAY TO ALL OF WYOMING AND THE WESTERN NEBRASKA PANHANDLE FOR THURSDAY THROUGH SATURDAY. A FEW THUNDERSTORMS MAY BECOME STRONG FRIDAY AND SATURDAY. .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 WYZ103>105-109>116-302115- NORTH LARAMIE RANGE-FERRIS/SEMINOE/SHIRLEY MOUNTAINS- SHIRLEY BASIN-CENTRAL CARBON COUNTY-NORTH SNOWY RANGE FOOTHILLS- SOUTHWEST CARBON COUNTY-SIERRA MADRE RANGE- UPPER NORTH PLATTE RIVER BASIN-SNOWY RANGE-LARAMIE VALLEY- SOUTH LARAMIE RANGE- 302 PM MDT TUE JUN 29 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL WYOMING... SOUTH CENTRAL WYOMING AND SOUTHEAST WYOMING. .DAY ONE...THIS AFTERNOON AND TONIGHT ISOLATED AFTERNOON THUNDERSTORMS WILL OCCUR IN AREAS ALONG AND WEST OF THE LARAMIE RANGE THROUGH THIS EVENING. GUSTY WINDS TO 40 MPH ARE POSSIBLE WITH THESE THUNDERSTORMS. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY ISOLATED THUNDERSTORM CHANCES WILL CONTINUE WEDNESDAY THROUGH FRIDAY. SOME OF THE THUNDERSTORMS MAY PRODUCE WIND GUSTS UP TO 40 MPH THROUGH THE PERIOD. .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
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 419 PM MDT TUE JUN 29 2010 WYZ114-292315- SNOWY RANGE WY- 419 PM MDT TUE JUN 29 2010 ...SIGNIFICANT WEATHER ADVISORY FOR EASTERN CARBON AND EXTREME WESTERN ALBANY COUNTIES UNTIL 515 PM MDT... AT 418 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 8 MILES EAST OF RYAN PARK...OR 41 MILES WEST OF LARAMIE NEAR THE SNOWY RANGE...DRIFTING WEST AT 5 MPH. HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN AND FREQUENT DANGEROUS LIGHTNING. LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE... NORTH FRENCH CREEK... TORRENTIAL RAIN...WHICH MAY FLOOD LOW LYING AREAS SUCH AS DITCHES...IS ALSO LIKELY. DO NOT DRIVE YOUR VEHICLE ON A FLOODED ROADWAY. TJT
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 517 PM MDT TUE JUN 29 2010 WYZ114-300000- SNOWY RANGE WY- 517 PM MDT TUE JUN 29 2010 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN CARBON AND EXTREME SOUTHWESTERN ALBANY COUNTIES UNTIL 600 PM MDT... AT 513 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 7 MILES NORTHWEST OF ROB ROY RESERVOIR...OR 39 MILES WEST OF LARAMIE NEAR SNOWY RANGE PASS...DRIFTING NORTH AT 5 MPH. HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN AND FREQUENT DANGEROUS LIGHTNING. LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE... BROOKLYN LAKE... TORRENTIAL RAIN...WHICH MAY FLOOD LOW LYING AREAS SUCH AS DITCHES...IS ALSO LIKELY. DO NOT DRIVE YOUR VEHICLE ON A FLOODED ROADWAY. TJT
The national radar mosaic for the moment the first event began.
1 high wind. Local standard time, as filed.
No thunderstorm was present at the airport at the time of the observation, however a distant thunderstorm was present at the time of the wind gust.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wyoming in 2010Every state in 2010This day in weather historyWarnings in Wyoming, June 2010
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: 233757.