Strong thunderstorms developed during the afternoon and produced hail and reports of weak tornadoes.
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.
Strong thunderstorms developed during the afternoon and produced hail and reports of weak tornadoes.
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 25, 5:33 PM MST, 19 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHEYENNE WY 633 PM MDT SAT JUN 25 2011 .DISCUSSION...THUNDERSTORMS WERE MAINLY FOCUED ACROSS THE NORTH PART OF THE CWA EARLY THIS EVENING. ACTIVITY CONTINUES TO SLOWLY BECOME STRONGER SINCE 2330Z WITH LOTS OF HAIL UP TO MARBLE SIZED REPORTED WITH THE STORMS. THE ACTIVITY SHOULD CONTINUE TO MOVE EAST WITH MOST OF IT OUTSIDE THE CWA BY 03Z. DRIER AIR HAS SPREAD OVER THE CWA FURTHER WEST WITH MUCH LESS AND MUCH WEAKER STORMS. LOW CLOUDS AND FOG ARE POSSIBLE OVER THE PANHANDLE AFTER 08Z AS THE LOW LEVEL MOISTURE PERSISTS. IN A RECENT UPDATE HAVE LOWERED POPS OVER MUCH OF THE WEST PART OF THE CWA AND MADE OTHER MINOR FIRST PERIOD CHANGES. && .AVIATION...00Z TAF ISSUANCE... THUNDERSTORMS WILL AFFECT THE NORTH PART OF THE CWA THROUGH 03Z WITH A PERIOD OF MVFR CEILINGS AND VISIBILITIES IN RAIN ASSOCIATED. IFR CEILINGS AND VISIBILITIES IN FOG CAN BE EXPECTED OVER THE PANHANDLE BETWEEN 08Z AND 16Z. SUNDAY WILL BE DRIER AND WINDIER OVER THE WEST PART OF THE CWA...WITH WESTERLY WINDS GUSTING AS HIGH AS 30 KNOTS. THUNDERSTORMS WILL AGAIN DEVELOP SUNDAY AFTERNOON OVER MAINLY THE NORTHEAST THIRD OF THE CWA AND CONTINUE THROUGH THE EVENING. && .PREVIOUS DISCUSSION.../ISSUED AT 112 PM MDT SAT JUN 25 2011/... SHORT TERM...TONIGHT THROUGH MONDAY. TONIGHT...ISOLATED TO SCATTERED SEVERE THUNDERSTORMS EXPECTED NORTH OF A DOUGLAS TO SIDNEY LINE THIS EVENING. NAM DEPICTS WELL PRONOUNCED LOW AND MID LEVEL THETA-E RIDGE AXISES ACROSS EASTERN WYOMING AND EASTERN COLORADO WITH THE LOW LEVEL THETA-E RIDGE AXIS SUGGESTING IMPRESSIVE LOW LEVEL THETA-E CONVERGENCE AND POSITIVE THETA-E ADVECTION INTO A PROJECTED SURFACE TROUGH AND CONVERGENCE AXIS FROM WHEATLAND TO LUSK TO RAPID CITY THIS EVENING. THUS...GREATEST RISK OF SEVERE THUNDERSTORMS THIS EVENING EXPECTED ACROSS EASTERN CONVERSE...NIOBRARA...PLATTE...GOSHEN COUNTIES OF WYOMING AND ACROSS THE WESTERN NEBRASKA PANHANDLE. WITH DECENT LOW LEVEL AND INSTABILITY MOISTURE FEED THIS EVENING...EXPECT STRONG TO SEVERE THUNDERSTORMS TO CONTINUE WELL INTO THE EVENING HOURS...AIDED IN LIFT BY THE SHORTWAVE TROUGH ALOFT MOVING EASTWARD ACROSS MONTANA AND WYOMING. THUNDERSTORMS ALONG AND WEST OF INTERSTATE 25 WILL DISSIPATE THIS EVENING WITH LOSS OF DAYTIME HEATING. AREAS OF FOG LIKELY LATE TONIGHT EAST OF A DOUGLAS TO KIMBALL LINE PER BOUNDARY LAYER PROGS OVER 90 PERCENT RELATIVE HUMIDITY AND WITH LOW LEVEL JET DEVELOPMENT. SUNDAY...COLD FRONT PROGRESSES SOUTH ACROSS OUR COUNTIES AS THE NEXT SHORTWAVE TROUGH ALOFT MOVES EAST ACROSS EASTERN MONTANA. WILL SEE SCATTERED AFTERNOON AND EVENING THUNDERSTORMS ERUPT NORTH OF A RAWLINS TO SIDNEY LINE IN THE LOW AND MID LEVEL THETA-E RIDGE AXISES FROM DOUGLAS TO SCOTTSBLUFF. 800 TO 2000 JOULES PER KILOGRAM OF CAPE AVAILABLE ALONG WITH ADEQUATE DIRECTIONAL WIND SHEAR TO PRODUCE A SLIGHT RISK OF SEVERE STORMS IN THE AFTERNOON AND EVENING NORTH OF A CASPER TO SCOTTSBLUFF LINE AS THE STORM PREDICTION CENTER DEPICTS. AS IS OFTEN THE CASE ACROSS EASTERN WYOMING AND EASTERN COLORADO...SEVERE WEATHER OUTBREAKS ARE MORE PRONOUNCED IN COVERAGE ON THE FIRST DAY AFTER THE PASSAGE OF A COLD FRONT...AS WILL BE THE CASE DUE TO THE STRONG DIRECTIONAL SHEAR AND POOLING OF LOW LEVEL MOISTURE AND INSTABILITY IN THE WAKE OF THE COLD FRONT. SUNDAY NIGHT...THUNDERSTORMS WILL DECREASE IN AREAL COVERAGE THROUGH THE NIGHT WITH LOSS OF HEATING. COVERAGE OF STORMS WILL BE GREATEST IN THE EVENING NORTH OF A DOUGLAS TO SCOTTSBLUFF LINE WHERE LOW LEVEL CONVERGENCE WILL BE MAXIMIZED NORTH OF THE COLD FRONT. MONDAY...LOW AND MID LEVEL THETA-E RIDGE AXISES WILL STRETCH FROM CASPER TO DENVER WITH THE INSTABILITY AXIS ALONG AND WEST OF THE LARAMIE RANGE. EXPECT ISOLATED AFTERNOON THUNDERSTORMS MAINLY ALONG AND WEST OF INTERSTATE 25 IN THE LOW AND MID LEVEL THETA-E RIDGE AXISES AND FEW IF ANY THUNDERSTORMS IN THE COOL AND MORE STABLE AIRMASS EAST OF INTERSTATE 25 IN THE WAKE OF THE PASSING COLD FRONT. RIDGING ALOFT WILL ALSO LIMIT AFTERNOON THUNDERSTORM COVERAGE COMPARED TO THUNDERSTORM COVERAGE TODAY AND SUNDAY. LONG TERM...MONDAY NIGHT THROUGH SATURDAY UPPER RIDGE FORECAST TO CONTINUE BUILDING INTO THE AREA MONDAY AND PERSISTING INTO WEDNESDAY. RIDGE BEGINS TO MOVE OFF TO THE EAST WEDNESDAY AFTERNOON AS A PACIFIC LOW PRESSURE SYSTEM MOVES INTO NORTHERN CALIFORNIA/NEVADA. KEPT SLIGHT CHANCE POPS GOING IN THE FORECAST FOR THE LATTER PART OF THE WEEK. TEMPERATURES QUITE WARM WITH UPPER 80S/LOW 90S TUESDAY AND THURSDAY...MID 90S WEDNESDAY AND THEN A COOL DOWN FRIDAY. && .AVIATION...18Z TAFS AFTERNOON CONVECTION STILL ANTICIPATED AT OUR TAF SITES...MORE LIKELY OVER THE PANHANDLE AIRPORTS AROUND THE 21-22Z TIMEFRAME. COVERAGE SHOULD BE LESS THAN FRIDAY EVENING...SO PINPOINTING EXACT AIRPORTS AND TIMING STILL FAIRLY DIFFICULT. WILL CONTINUE VCTS WORDING IN TAFS AND WAIT FOR FURTHER DEVELOPMENT. && .FIRE WEATHER...NO FIRE WEATHER ISSUES THROUGH MONDAY. && .HYDROLOGY... WARMER THAN NORMAL TEMPERATURES WILL CONTINUE THROUGH THIS WEEKEND... FOLLOWED BY COOLER TEMPERATURES BEHIND A FRONT ON MONDAY. HIGHS THIS WEEKEND WILL BE IN THE 80S ACROSS THE PLAINS WITH 60S AND 70S IN THE MOUNTAINS AND HIGH VALLEYS. THESE WARM TEMPERATURES WILL INCREASE THE RATE OF MOUNTAIN SNOW MELT. ISOLATED TO SCATTERED AFTERNOON AND EVENING SHOWERS AND THUNDERSTORMS WILL CONTINUE THROUGH THE WEEKEND. STRONG TO SEVERE STORMS WILL BE POSSIBLE OVER THE EASTERN PLAINS THIS AFTERNOON AND EVENING...WITH PRECIPITATION TOTALS UP TO ONE HALF INCH. THE MOUNTAINS CAN EXPECT UP TO A TENTH OF AN INCH. FLOOD WARNINGS REMAIN IN EFFECT FOR SARATOGA...SINCLAIR...ENCAMPMENT AND LARAMIE. && .CYS WATCHES/WARNINGS/ADVISORIES... WY...NONE. NE...NONE. && SHORT TERM...RUBIN LONG TERM/AVIATION...CLAYCOMB UPDATE...WEILAND
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHEYENNE WY 1100 AM MDT SAT JUN 25 2011 WYZ103>106-109>118-261200- NORTH LARAMIE RANGE-FERRIS/SEMINOE/SHIRLEY MOUNTAINS- SHIRLEY BASIN-CENTRAL LARAMIE RANGE AND SOUTHWEST PLATTE 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- 1100 AM MDT SAT JUN 25 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL WYOMING... SOUTH CENTRAL WYOMING AND SOUTHEAST WYOMING. .DAY ONE...TODAY AND TONIGHT THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND EVENING NORTH OF A DOUGLAS TO SIDNEY LINE. SCATTERED THUNDERSTORMS WILL DEVELOP EARLY THIS AFTERNOON... PRIMARILY ALONG AND EAST OF INTERSTATE 25. BECAUSE OF ADEQUATE WIND SHEAR AND INSTABILITY...SOME OF THE THUNDERSTORMS WILL LIKELY BECOME SEVERE ACROSS EASTERN CONVERSE...NIOBRARA...GOSHEN AND PLATTE COUNTIES THIS AFTERNOON AND EVENING ALONG A SURFACE TROUGH AND CONVERGENCE AXIS FROM WHEATLAND TO LUSK TO RAPID CITY. SEVERE THUNDERSTORMS WILL BE MOST LIKELY BETWEEN 200 PM AND 1000 PM ALONG THE SURFACE TROUGH AND CONVERGENCE AXIS FROM WHEATLAND TO LUSK. STORM MOVEMENT WILL BE TO THE NORTHEAST AT 25 MPH. THREATS FROM SEVERE THUNDERSTORMS WILL INCLUDE ONE INCH DIAMETER OR LARGER HAIL...WIND GUSTS IN EXCESS OF 60 MPH AND HEAVY RAIN. THUNDERSTORMS WILL DECREASE IN COVERAGE AND INTENSITY AFTER MIDNIGHT. ISOLATED THUNDERSTORMS WILL DEVELOP ELSEWHERE THIS AFTERNOON AND EVENING...SOUTH OF A DOUGLAS TO SIDNEY LINE...OUTSIDE OF THE SLIGHT RISK AREA...WITH THE THREATS FROM THUNDERSTORMS INCLUDING WIND GUSTS TO 55 MPH AND HAIL UNDER ONE INCH IN DIAMETER. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY SCATTERED AFTERNOON AND EVENING THUNDERSTORMS ARE EXPECTED SUNDAY. SOME OF THE THUNDERSTORMS MAY BE STRONG TO SEVERE. MINOR TO MODERATE FLOODING ALONG THE LARAMIE AND THE UPPER NORTH PLATTE RIVERS WILL CONTINUE THROUGH NEXT WEEK. .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-WYZ101-102-107-108-119-261200- DAWES-BOX BUTTE-SCOTTS BLUFF-BANNER-MORRILL-KIMBALL-CHEYENNE- NORTH SIOUX-SOUTH SIOUX-CONVERSE COUNTY LOWER ELEVATIONS- NIOBRARA COUNTY-EAST PLATTE COUNTY-GOSHEN COUNTY- EAST LARAMIE COUNTY- 1100 AM MDT SAT JUN 25 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE WESTERN NEBRASKA PANHANDLE...SOUTHEAST WYOMING. .DAY ONE...TODAY AND TONIGHT THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND EVENING NORTH OF A DOUGLAS TO SIDNEY LINE. SCATTERED THUNDERSTORMS WILL DEVELOP EARLY THIS AFTERNOON...PRIMARILY ALONG A SURFACE TROUGH AND CONVERGENCE AXIS THAT WILL STRETCH FROM WHEATLAND TO LUSK TO RAPID CITY...AND ALONG THE EASTERN SLOPES OF THE LARAMIE RANGE FROM DOUGLAS TO WHEATLAND TO CHEYENNE. BECAUSE OF ADEQUATE WIND SHEAR AND INSTABILITY...SOME OF THE THUNDERSTORMS WILL LIKELY BECOME SEVERE ACROSS MUCH OF THE PANHANDLE OF WESTERN NEBRASKA THIS AFTERNOON AND EVENING...WITH THE GREATEST THREAT ACROSS SIOUX...DAWES...BOX BUTTE...SCOTTS BLUFF AND MORRILL COUNTIES FROM MID AFTERNOON THROUGH THIS EVENING. SEVERE THUNDERSTORMS WILL BE MOST LIKELY BETWEEN 200 PM AND 1000 PM ALONG THE SURFACE TROUGH AND CONVERGENCE AXIS FROM WHEATLAND TO LUSK TO RAPID CITY. STORM MOVEMENT WILL BE TO THE NORTHEAST AT 25 MPH. THREATS FROM SEVERE THUNDERSTORMS WILL INCLUDE ONE INCH DIAMETER OR LARGER HAIL...WIND GUSTS IN EXCESS OF 60 MPH AND HEAVY RAIN. THUNDERSTORMS WILL DECREASE IN COVERAGE AND INTENSITY AFTER MIDNIGHT. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY SCATTERED AFTERNOON AND EVENING THUNDERSTORMS ARE EXPECTED SUNDAY. SOME STRONG TO SEVERE THUNDERSTORMS WILL BE POSSIBLE NORTHEAST OF A LINE FROM DOUGLAS TO SIDNEY. MINOR TO MODERATE FLOODING ALONG THE LOWER NORTH PLATTE RIVER WILL CONTINUE THROUGH NEXT WEEK. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE REQUIRED THIS AFTERNOON AND EVENING. && THIS PRODUCT...ALONG WITH OTHER WEATHER...HYDROLOGIC...AND CLIMATE INFORMATION IS AVAILABLE ON THE WEB AT... HTTP://WEATHER.GOV/CHEYENNE RUBIN
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
611 PM MDT SAT JUN 25 2011
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0559 PM HAIL 20 SE HARRISON 42.48N 103.60W
06/25/2011 E0.25 INCH SIOUX NE TRAINED SPOTTER
0602 PM TSTM WND GST 10 NW CRAWFORD 42.79N 103.55W
06/25/2011 E40 MPH SIOUX NE TRAINED SPOTTER
&&
MWEILANDSPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 617 PM MDT SAT JUN 25 2011 WYZ101-102-260115- CONVERSE COUNTY LOWER ELEVATIONS WY-NIOBRARA COUNTY WY- 617 PM MDT SAT JUN 25 2011 ...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN CONVERSE AND NORTHWESTERN NIOBRARA COUNTIES UNTIL 715 PM MDT... AT 614 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR BILL...OR 32 MILES NORTH OF DOUGLAS...MOVING EAST AT 35 MPH. HAIL UP TO THE SIZE OF PENNIES AND WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH FREQUENT DANGEROUS LIGHTNING. LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE... MIDDLE CREEK RESERVOIR... DULL RESERVOIR... IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A STURDY BUILDING. RE
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 619 PM MDT SAT JUN 25 2011 WYZ102-260100- NIOBRARA COUNTY WY- 619 PM MDT SAT JUN 25 2011 ...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN NIOBRARA COUNTY UNTIL 700 PM MDT... AT 618 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR LANCE CREEK...OR 19 MILES NORTH OF LUSK... MOVING NORTHEAST AT 35 MPH. HAIL UP TO THE SIZE OF PENNIES AND WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH FREQUENT DANGEROUS LIGHTNING. LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE... REDBIRD... IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A STURDY BUILDING. RE
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
624 PM MDT SAT JUN 25 2011
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0619 PM HAIL 8 SE CRAWFORD 42.60N 103.30W
06/25/2011 M0.50 INCH DAWES NE TRAINED SPOTTER
ALSO WIND GUSTS TO 30 MPH.
0623 PM HAIL BILL 43.21N 105.26W
06/25/2011 E0.25 INCH CONVERSE WY TRAINED SPOTTER
&&
MWEILANDSPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 630 PM MDT SAT JUN 25 2011 NEZ020-021-054-055-260115- BANNER NE-CHEYENNE NE-KIMBALL NE-MORRILL NE- 630 PM MDT SAT JUN 25 2011 ...SIGNIFICANT WEATHER ADVISORY FOR EXTREME SOUTHWESTERN MORRILL... NORTHEASTERN KIMBALL...EXTREME NORTHWESTERN CHEYENNE AND SOUTHEASTERN BANNER COUNTIES UNTIL 715 PM MDT... AT 628 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 11 MILES NORTH OF BENNETT RESERVOIR...OR 13 MILES NORTH OF KIMBALL...MOVING EAST AT 25 MPH. HAIL UP TO THE SIZE OF NICKELS AND WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THIS STORM. LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE... MAINLY RURAL AREAS OF EXTREME NORTHEASTERN KIMBALL...NORTHWESTERN CHEYENNE...SOUTHEASTERN BANNER AND SOUTHWESTERN MORRILL COUNTIES. IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A STURDY BUILDING. RE
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 650 PM MDT SAT JUN 25 2011 WYZ101-260145- CONVERSE COUNTY LOWER ELEVATIONS WY- 650 PM MDT SAT JUN 25 2011 ...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN CONVERSE COUNTY UNTIL 745 PM MDT... AT 646 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR BLUE HILL RESERVOIR...OR 20 MILES NORTHEAST OF EVANSVILLE...MOVING NORTHEAST AT 40 MPH. HAIL UP TO THE SIZE OF PENNIES AND WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH FREQUENT DANGEROUS LIGHTNING. LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE... MAINLY RURAL AREAS OF NORTHERN CONVERSE COUNTY. RE
The Cheyenne radar (KCYS), 111 km away, was scanning. The volume nearest the first event began at 00:50 UTC.
5 hail, 3 tornado, 2 thunderstorm wind, 1 funnel cloud. Local standard time, as filed.
A trained spotter reported a brief tornado touchdown on open range.
Semi trailer blown over on Interstate 80. Emergency manager believes it was down burst wind.
A trained spotter reported rope tornado over open range with no damage.
Two large pine trees blown down by straight line winds.
A trained spotter reported a funnel cloud northwest of Sidney.
Law enforcement reported an apparent brief touchdown by a weak tornado with no damage.
Spotter reported strong rotation to the west.
Numerous reports of large hail in Sidney ranging from golf ball to softball size. Emergency manager reported north side of Sidney looked like war zone.
Mostly pea to marble size hail observed.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Nebraska in 2011Every state in 2011This day in weather historyThe tornado archive for Nebraska, 2011Warnings in Nebraska, 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: 304359, 304360, 304363, 304365, 304379, 304371, 304381, 304382, 304385, 304392, 304396.