Thunderstorms developed and produced gust straight line winds.
Every event with a place to put it. 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.
Thunderstorms developed and produced gust straight line winds.
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, 1:27 PM MST, 3 hours 54 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHEYENNE WY 227 PM MDT WED JUN 29 2011 .SHORT TERM...TONIGHT THROUGH FRIDAY FORECAST CHALLENGES DEAL WITH PRECIP CHANCES TODAY AND THURSDAY. CURRENTLY...CONVECTION ON THE INCREASE THIS AFTERNOON ACROSS THE CWA WITH RADAR IMAGERY SHOWING ISOLATED TO WIDELY SCATTERED COVERAGE. TEMPERATURES HAVE LEVELED OFF WITH THIS CLOUDINESS. FURTHER WEST...A MORE WIDESPREAD COVERAGE OF SHOWERS AND THUNDERSTORMS HAVE DEVELOPED ACROSS CENTRAL UTAH UP INTO WESTERN WYOMING. FOR THIS AFTERNOON AND EVENING...THUNDERSTORM COVERAGE WILL CONTINUE TO INCREASE OVER CARBON COUNTY AND AREAS WEST OF THE LARAMIE RANGE. MOST OF THESE THUNDERSTORMS WILL BE HIGH BASED WITH LITTLE IN THE WAY OF PRECIPITATION REACHING THE GROUND UNTIL THE SYSTEM CURRENTLY OVER UTAH GETS A LITTLE CLOSER THURSDAY. THURSDAY...MODELS HAVE COME INTO DECENT AGREEMENT IN TERMS OF AREAL COVERAGE OF SHOWERS AND THUNDERSTORMS AS THE POTENT UPPER SHORTWAVE TRACKS INTO SOUTH CENTRAL WYOMING DURING THE AFTERNOON HOURS. WENT AHEAD AND INCREASED POP COVERAGE THURSDAY WITH BEST CHANCES DURING THE AFTERNOON HOURS. THIS SHORTWAVE QUICKLY PUSHES NORTHEAST INTO SOUTHWEST SOUTH DAKOTA BY EARLY THURSDAY EVENING. WRF SHOWING SOME FAIRLY HIGH CAPE VALUES AHEAD OF THIS SYSTEM DURING THE AFTERNOON WITH 1500 TO 2000 J/KG. WENT AHEAD WITH SOME MODERATE THUNDERSTORMS IN THE HWO FOR TOMORROW AFTERNOON.\ FRIDAY LOOKS DRY AS THE UPPER SHORTWAVE EXITS EAST AND WESTERLY WINDS RETURN. LOOK FOR HIGHS IN THE MID 80S WITH BREEZY CONDITIONS THROUGH THE AFTERNOON. .LONG TERM...FRIDAY NIGHT THROUGH WEDNESDAY... VERY WARM TEMPERATURES WILL CONTINUE OVER THE CWA FOR THIS PART OF THE FORECAST. HEIGHTS ALOFT SLOWLY INCREASE OVER THE ROCKIES FROM FRIDAY NIGHT THROUGH EARLY NEXT WEEK. BY MONDAY...THE LARGE UPPER HIGH WILL BE CENTERED OVER UTAH AND COLORADO. THE HIGH BY MID WEEK IS PUSHED SOUTH SOME. SOME MOISTURE WILL LINGER THROUGH SATURDAY OVER MAINLY THE SOUTHEAST PART OF THE CWA. THE MOISTURE PLUME IS THEN SHUNTED TO OUR SOUTH AND WEST WITH THE DRIER AIR OVER THE REGION THROUGH LATE SUNDAY NIGHT. THE MID AND UPPER LEVEL MOISTURE PLUME RETURNS MONDAY AND CONTINUE OVER THE AREA THROUGH WEDNESDAY. RETURN BOUNDARY LAYER WIND FLOW WILL INCREASE THE LOW LEVEL MOISTURE OVER THE EAST PART OF THE CWA SATURDAY AND WILL BE REINFORCED WITH THE PASSAGE OF A COLD FRONT MONDAY AFTERNOON AND EVENING. PRECIPITABLE WATER VALUES RETURN TO UP TO AN INCH OVER THE EAST PART OF THE CWA TUESDAY AND WEDNESDAY. SHOWER AND THUNDERSTORM ACTIVITY WILL INCREASE OVER THE CWA MONDAY THROUGH WEDNESDAY WITH STORMS MOST WIDESPREAD TUESDAY AND WEDNESDAY. THE WARMEST TEMPERATURES WILL BE ON SUNDAY AND MONDAY AHEAD OF THE COLD FRONT. MODELS ARE FAIRLY SIMILAR FOR THIS FORECAST AND LOOK REASONABLE. && .AVIATION...00Z TAF ISSUANCE... VFR CONDITIONS WILL CONTINUE OVER THE CWA THROUGH THURSDAY. MID AND UPPER LEVEL MOISTURE CURRENTLY OVER THE CWA WILL HELP IN THE FORMATION OF FAIRLY NUMEROUS HIGH BASED THUNDERSTORMS THROUGH 03Z. THE MAIN THREAT WITH THAT ACTIVITY WILL BE BRIEF AND LOCAL WIND GUSTS TO 45 KNOTS. GENERAL SOUTHWEST WINDS WILL ALSO GUST AS HIGH AS 40 KNOTS THROUGH 02Z AND AGAIN AFTER 15Z MAINLY IN AREAS ALONG AND WEST OF THE LARAMIE RANGE. A SCATTERED COVERAGE OF THUNDERSTORMS WILL AGAIN DEVELOP OVER THE MOUNTAINS IN THE EARLY AFTERNOON THURSDAY AND MOVE TO THE NORTHEAST. BRIEF MVFR CEILINGS AND VISIBILITIES WILL BE ASSOCIATED WITH THE ACTIVITY OVER THE EAST PART OF THE CWA THURSDAY AFTERNOON AND EVENING. && .FIRE WEATHER... AN AREA OF LOW PRESSURE CURRENTLY OVER UTAH WILL CONTINUE MOVING NORTHEAST THIS AFTERNOON AND OVERNIGHT. THIS LOW WILL BRING US INCREASING CHANCES FOR SHOWERS AND THUNDERSTORMS THROUGH THURSDAY AFTERNOON WITH COOLER TEMPERATURES THURSDAY AND FRIDAY. HIGH PRESSURE THEN BUILDS IN BEHIND THE LOW FRIDAY AFTERNOON AND PERSISTS INTO THE WEEKEND. WARMER TEMPERATURES RETURN WITH HIGHS CLIMBING BACK INTO THE UPPER 80S AND LOW 90S. && .HYDROLOGY... FLOOD WARNINGS REMAIN IN EFFECT FOR SARATOGA...SINCLAIR...HENRY AND MITCHELL ALONG THE NORTH PLATTE RIVER AS WELL AS THE LARAMIE RIVER NEAR LARAMIE. RIVER LEVELS WILL REMAIN STEADY OR SLOWLY FALL THROUGH EARLY NEXT WEEK ALONG THE LOWER NORTH PLATTE RIVER...WITH DIURNAL RISES AND FALLS MIXED IN WITH A GENERAL DECREASING TREND FURTHER WEST. HOT TEMPERATURES ARE FORECAST THROUGH EARLY NEXT WEEK WHICH WILL RESULT IN INCREASED MOUNTAIN SNOW MELT. HOWEVER...WITH MOST OF THE SNOW PACK BELOW 9500 FEET MSL IN THE MOUNTAINS ALREADY MELTED... DO NOT ANTICIPATE ANY SIGNIFICANT RISES THIS WEEK. && .CYS WATCHES/WARNINGS/ADVISORIES... WY...NONE. NE...NONE. && SHORT TERM...CLAYCOMB LONG TERM/AVIATION...WEILAND
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHEYENNE WY 1255 PM MDT WED JUN 29 2011 WYZ101>119-301900- CONVERSE COUNTY LOWER ELEVATIONS-NIOBRARA COUNTY- NORTH LARAMIE RANGE-FERRIS/SEMINOE/SHIRLEY MOUNTAINS- SHIRLEY BASIN-CENTRAL LARAMIE RANGE AND SOUTHWEST PLATTE COUNTY- EAST PLATTE COUNTY-GOSHEN COUNTY-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-SOUTH LARAMIE RANGE FOOTHILLS- CENTRAL LARAMIE COUNTY-EAST LARAMIE COUNTY- 1255 PM MDT WED JUN 29 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL WYOMING... SOUTH CENTRAL WYOMING AND SOUTHEAST WYOMING. .DAY ONE...THIS AFTERNOON AND TONIGHT HOT TEMPERATURES ARE EXPECTED TODAY...WITH SOME SITES APPROACHING RECORD READINGS. THIS WILL RESULT IN INCREASING MOUNTAIN SNOW MELT. MINOR TO MODERATE FLOODING ALONG THE LARAMIE AND THE UPPER NORTH PLATTE RIVERS WILL CONTINUE. THERE IS A CHANCE OF THUNDERSTORMS LATE THIS AFTERNOON ESPECIALLY WEST OF THE LARAMIE RANGE WITH SLIGHT CHANCES ALONG AND EAST OF THE LARAMIE RANGE. THESE THUNDERSTORMS WILL BE HIGH BASED WITH THE MAIN HAZARD BEING DOWNBURST WINDS TO 50 MPH. DRY LIGHTNING...WITH VERY LITTLE IN THE WAY OF RAINFALL WILL ALSO BE A HAZARD WITH THESE STORMS. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY HOT TEMPERATURES WILL CONTINUE THURSDAY...WITH FLOODING CONCERNS EXPECTED TO CONTINUE THROUGH THE WEEKEND. THERE WILL BE A BETTER CHANCE FOR SHOWERS AND THUNDERSTORMS THURSDAY...WITH SOME THUNDERSTORMS BECOMING STRONG ACROSS AREAS ALONG AND EAST OF THE LARAMIE RANGE. STRONG DOWNBURST WINDS AND HAIL TO THE SIZE OF NICKELS ARE POSSIBLE THURSDAY AFTERNOON INTO THE EVENING HOURS. .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 NEZ002-003-019>021-054-055-095-096-301900- DAWES-BOX BUTTE-SCOTTS BLUFF-BANNER-MORRILL-KIMBALL-CHEYENNE- NORTH SIOUX-SOUTH SIOUX- 1255 PM MDT WED JUN 29 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE WESTERN NEBRASKA PANHANDLE. .DAY ONE...THIS AFTERNOON AND TONIGHT HOT TEMPERATURES ARE EXPECTED TODAY...WITH SOME SITES APPROACHING RECORD READINGS. A SLIGHT CHANCE FOR THUNDERSTORMS IS EXPECTED FOR LATE THIS AFTERNOON. THE MAIN HAZARD WITH THESE THUNDERSTORMS WILL BE STRONG DOWNBURST WINDS TO 50 MPH THIS AFTERNOON AND EARLY EVENING. MINOR TO MODERATE FLOODING ALONG THE LOWER NORTH PLATTE RIVER WILL CONTINUE THIS WEEK. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY HOT TEMPERATURES WILL CONTINUE THURSDAY...WITH FLOODING CONCERNS EXPECTED TO CONTINUE THROUGH THE WEEKEND. THERE WILL BE A BETTER CHANCE FOR SHOWERS AND THUNDERSTORMS THURSDAY...WITH SOME THUNDERSTORMS BECOMING STRONG ACROSS THE NORTHERN PANHANDLE. STRONG DOWNBURST WINDS AND HAIL TO THE SIZE OF NICKELS ARE POSSIBLE THURSDAY AFTERNOON INTO THE EVENING HOURS. .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 225 PM MDT WED JUN 29 2011 NEZ003-019>021-096-292130- BANNER NE-BOX BUTTE NE-MORRILL NE-SCOTTS BLUFF NE-SOUTH SIOUX NE- 225 PM MDT WED JUN 29 2011 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN SIOUX...SCOTTS BLUFF...NORTHWESTERN MORRILL...EXTREME SOUTHWESTERN BOX BUTTE AND NORTHWESTERN BANNER COUNTIES UNTIL 330 PM MDT... AT 224 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 11 MILES WEST OF WILDCAT HILLS STATE RECREATION AREA...OR 17 MILES SOUTHWEST OF SCOTTSBLUFF...MOVING NORTHEAST AT 25 MPH. WIND GUSTS UP TO 50 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH FREQUENT DANGEROUS LIGHTNING. LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE... SCOTTSBLUFF... WILDCAT HILLS STATE RECREATION AREA... SCOTTS BLUFF NATIONAL MONUMENT... GERING... TERRYTOWN... SCOTTSBLUFF AIRPORT... MINATARE... LAKE ALICE... LAKE MINATARE... MELBETA...
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 305 PM MDT WED JUN 29 2011 NEZ002-003-019>021-055-096-292200- BANNER NE-BOX BUTTE NE-CHEYENNE NE-DAWES NE-MORRILL NE-SCOTTS BLUFF NE-SOUTH SIOUX NE- 305 PM MDT WED JUN 29 2011 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN SIOUX...EASTERN SCOTTS BLUFF...MORRILL...SOUTHWESTERN DAWES...NORTHERN CHEYENNE... WESTERN BOX BUTTE AND NORTHEASTERN BANNER COUNTIES UNTIL 400 PM MDT... AT 302 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR HUBBARD GAP...OR 17 MILES SOUTHEAST OF SCOTTSBLUFF...MOVING NORTHEAST AT 25 MPH. HAIL UP TO THE SIZE OF PENNIES AND WIND GUSTS UP TO 50 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH FREQUENT DANGEROUS LIGHTNING.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 308 PM MDT WED JUN 29 2011 WYZ117>119-292215- CENTRAL LARAMIE COUNTY WY-EAST LARAMIE COUNTY WY-SOUTH LARAMIE RANGE FOOTHILLS WY- 308 PM MDT WED JUN 29 2011 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN LARAMIE COUNTY UNTIL 415 PM MDT... AT 306 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 13 MILES SOUTHWEST OF NATURAL FORT REST AREA...OR 27 MILES SOUTHWEST OF CHEYENNE...MOVING NORTHEAST AT 20 MPH. HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 50 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH FREQUENT DANGEROUS LIGHTNING. LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE... CHEYENNE... WARREN AF BASE... NORTH CHEYENNE... CARPENTER... I-80 AND I-25 INTERCHANGE... SOUTH GREELEY HIGHWAY... FOX FARM-COLLEGE... HILLSDALE... THIS INCLUDES INTERSTATE 80 IN WYOMING BETWEEN MILE MARKERS 350 AND 385. THIS INCLUDES INTERSTATE 25 IN WYOMING BETWEEN MILE MARKERS 0 AND 9. GRIFFITH
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 314 PM MDT WED JUN 29 2011 WYZ104-109-292215- CENTRAL CARBON COUNTY WY-FERRIS/SEMINOE/SHIRLEY MOUNTAINS WY- 314 PM MDT WED JUN 29 2011 ...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL CARBON COUNTY UNTIL 415 PM MDT... AT 310 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 6 MILES WEST OF RAWLINS...MOVING NORTHEAST AT 20 MPH. HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 50 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH FREQUENT DANGEROUS LIGHTNING. LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE... RAWLINS... SINCLAIR... SEPARATION LAKE... I-80 EXIT 211... I-80 EXIT 215... I-80 EXIT 221... GRIFFITH
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 347 PM MDT WED JUN 29 2011 NEZ021-292200- MORRILL NE- 347 PM MDT WED JUN 29 2011 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN MORRILL COUNTY UNTIL 400 PM MDT... AT 344 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 5 MILES NORTHWEST OF LISCO...OR 33 MILES NORTHEAST OF SIDNEY...MOVING NORTHEAST AT 25 MPH. HAIL UP TO THE SIZE OF NICKELS AND WIND GUSTS UP TO 50 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH FREQUENT DANGEROUS LIGHTNING. LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE... MAINLY RURAL AREAS OF EXTREME EASTERN MORRILL COUNTY. GRIFFITH
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 614 PM MDT WED JUN 29 2011 WYZ114>117-300115- LARAMIE VALLEY WY-SNOWY RANGE WY-SOUTH LARAMIE RANGE WY-SOUTH LARAMIE RANGE FOOTHILLS WY- 614 PM MDT WED JUN 29 2011 ...SIGNIFICANT WEATHER ADVISORY FOR WESTERN LARAMIE AND SOUTHEASTERN ALBANY COUNTIES UNTIL 715 PM MDT... AT 612 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 8 MILES SOUTHEAST OF WOODS LANDING...OR 25 MILES SOUTHWEST OF LARAMIE...MOVING NORTHEAST AT 35 MPH. HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 50 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH FREQUENT DANGEROUS LIGHTNING. LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE... LARAMIE... HUTTON LAKE... BALDY PEAK... I-80 EXIT 311... I-80 EXIT 316... THIS INCLUDES INTERSTATE 80 IN WYOMING BETWEEN MILE MARKERS 304 AND 322. GRIFFITH
The Cheyenne radar (KCYS), 88 km away, was scanning. The volume nearest the first event began at 00:21 UTC.
4 thunderstorm wind. Local standard time, as filed.
A trained spotter estimated wind gusts of 60 mph.
The ASOS at the airport recorded a wind gust of 60 mph.
The ASOS at the airport measured wind gusts of 59 mph.
WYDOT sensor at Vedauwoo measured wind gusts of 61 mph.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wyoming in 2011Every state in 2011This day in weather historyWarnings in Wyoming, June 2011
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: 306045, 306038, 306050, 306056.