Storms developed over the panhandle during the afternoon and produced a brief tornado.
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.
Storms developed over the panhandle during the afternoon and produced a brief tornado.
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 18, 12:13 PM MST, 47 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHEYENNE WY 113 PM MDT SAT JUN 18 2011 .UPDATE...UPDATED FORECAST TO INCLUDE THE SEVERE THUNDERSTORM WATCH NOW IN EFFECT UNTIL 8 PM ACROSS THE SOUTHERN NEBRASKA PANHANDLE. MAIN THREAT APPEARS TO BE LARGE HAIL. THUNDERSTORMS HAVE DEVELOPED ACROSS SOUTHEAST WYOMING LATE THIS MORNING AND PUSHED INTO NEBRASKA. REPORTS IN THE LAST FEW HOURS HAVE BEEN MAINLY MODERATE SIZED HAIL OF A HALF AN INCH TO THREE QUARTERS OF AN INCH. && .PREV DISCUSSION... /ISSUED 332 AM MDT SAT JUN 18 2011/ SHORT TERM...TODAY THROUGH MONDAY NIGHT... SW FLOW WILL OCCUR ALOFT AS AN UPPER TROUGH BEGINS TO DEEPEN OVER THE WESTERN U.S. A DISTURBANCE IN THE FLOW WILL MOVE ACROSS THE EASTERN HALF OF THE CWA TODAY. LI/S IN THE NEB PANHANDLE WILL BE -3 TO -4 IN THE NEBRASKA PANHANDLE BY LATE THIS AFTERNOON WITH CAPE VALUES OF 1000 TO 1500 J/KG. LI/S IN THE WY PORTION OF THE CWA WILL BE FROM 0 TO -2 WITH CAPES OF 400-500 J/KG. AGREE WITH SPC THAT SEVERE STORMS WILL BE LIKELY IN THE NEBRASKA PANHANDLE THIS AFTERNOON AND EVENING WITH THE MAIN THREAT BEING LARGE HAIL AND GUSTY WINDS. BRIEF HEAVY RAIN WILL ALSO OCCUR WITH THE STRONGER STORMS. THUNDERSTORMS WILL ALSO OCCUR ACROSS THE REST OF THE CWA WITH SMALL HAIL...BRIEF HEAVY RAIN AND GUSTY WINDS WITH THE STRONGER STORMS. SW FLOW WILL CONT ALOFT TONIGHT AS THE UPPER TROUGH CONTS TO DEEPEN OVER THE WESTERN U.S. ON SUN...SW FLOW WILL CONT AS THE UPPER TROUGH AXIS BEGINS TO MOVE INTO WESTERN WY. THE ASSOCIATED COLD FRONT WILL BEGIN TO MOVE INTO THE CWA LATE SAT NIGHT AND WILL BE THROUGH THE AREA BY SUN AFTERNOON. LI/S ON SUN WILL BE FROM -3 TO -5 IN THE SOUTHERN PH AHEAD OF THE FRONT...AND FROM 0 TO -3 IN THE WY PORTION OF THE CWA. CAPES WILL BE FROM 1000 TO 1800 IN THE NEB PH SUN AFTERNOON...SO SEVERE STORMS WILL AGAIN BE LIKELY IN THIS AREA SUN AFTERNOON AND EVENING. THUNDERSTORMS WILL OCCUR ACROSS THE REST OF THE CWA WITH SMALL HAIL AND BRIEF HEAVY RAIN LIKELY. THE UPPER TROUGH WILL CONTINUE TO DEEPEN AS THE AXIS MOVES TO CENTRAL WY SUN NIGHT. ON MON...THE UPPER TROUGH AXIS WILL MOVE EAST OF THE CWA WITH A DISTURBANCE MOVING ACROSS THE FORECAST AREA AS IT ROTATES AROUND THE UPPER LOW OVER THE CENTRAL PLAINS. THIS WILL RESULT IN A CHANCE OF SHOWERS AND AFTERNOON AND EVENING THUNDERSTORMS FOR THE CWA. FOR MON NIGHT...CYCLONIC NORTH FLOW WILL BE OVER THE AREA WITH A CLOSED UPPER LOW DEVELOPING OVER THE CENTRAL PLAINS. HIGH TEMPERATURES WILL BE FROM 3 TO 5 DEGREES BELOW NORMAL TODAY AND SUNDAY...AND FROM 10 TO 12 DEGREES BELOW NORMAL ON MONDAY. LONG TERM...TUESDAY THROUGH SATURDAY... 00Z MEDIUM RANGE GLOBAL MODELS ARE CONSISTENT IN CARRYING THE INCREASINGLY VERTICALLY STACKED LOW PRESSURE SYSTEM INTO ERN NEBRASKA/WRN IOWA DURING THE DAY ON TUESDAY. THE RESULTANT IMPACT WILL BE FOR GRADUALLY DRYING CONDITIONS FROM WEST TO EAST DURING THE DAY AS UPPER-LEVEL RIDGING WORKS IN. THE POSITIVELY TILTED RIDGE AXIS WILL SLOWLY BUILD OVER THE CWA ON WEDNESDAY AND WEDNESDAY NIGHT. AT THE SFC...THE CORRESPONDING NRN HIGH PLAINS HIGH PRESSURE WILL BUILD SOUTH WITH TIME ON WEDNESDAY. SO FOR AREAS EAST OF THE LARAMIE RANGE...BOUNDARY LAYER FLOW WILL TURN FROM NORTHEASTERLY EARLY IN THE DAY TO SOUTHEASTERLY LATE IN THE DAY. OPTED TO INCLUDE SOME SHOWER/THUNDERSTORM CHANCES FOR THE HIGHER TERRAIN WEDNESDAY AFTERNOON/EARLY EVENING AS UPSLOPE FLOW SHOULD BE ABLE TO INITIATE AT LEAST SOME WEAK CONVECTION. IF CONVECTION IS ABLE TO DEVELOP... WOULD EXPECT IT TO REMAIN WEAK AS SBCAPES OF 200 TO 400 J/KG WILL BE ABOUT IT. BOUNDARY LAYER RETURN FLOW WILL STRENGTHEN FURTHER ON THURSDAY...SO BETTER MOISTURE AND INSTABILITY WILL BE AVAILABLE FOR AREAS EAST OF THE LARAMIE RANGE. PROGD SOUNDINGS SHOW AREAS OVER THE WRN NEBRASKA WILL BE CAPPED ON THURSDAY...SO CONFINED CONVECTION CHANCES TO SOUTHEAST WYOMING...WITH BEST CHANCES ALONG AND EAST OF THE LARAMIE RANGE. UPPER RIDGE AXIS DRIFTS INTO THE PLAINS ON FRIDAY AS ANOTHER UPPER LOW TAKES SHAPE OVER THE PAC NW/SW CANADA. THE 00Z GFS IS A BIT MORE AMPLIFIED THAN THE 00Z ECMWF...BUT IN GENERAL AGREEMENT WITH ITS PLACEMENT. BOTH MODELS KICK OUT A SHORTWAVE AS FLOW BECOMES SOUTHWEST AROUND THE UPSTREAM UPPER LOW ON BOTH FRIDAY AND SATURDAY. INSTABILITIES WILL CONTINUE TO INCREASE AS RETURN FLOW CONTINUES TO ADVECT BETTER BOUNDARY LAYER MOISTURE NORTH ALONG THE FRONT RANGE. EVEN THOUGH PROBABLY ON THE HIGH SIDE...THE 00Z GFS DEPICTS CAPE VALUES IN EXCESS OF 2000 J/KG OVER THE WRN NEBRASKA PANHANDLE ON BOTH FRIDAY AND SATURDAY AFTERNOON. SO...WOULD EXPECT THESE TWO DAYS TO PROVIDE THE NEXT CHANCE FOR SEVERE WEATHER FOR THE EASTERN PLAINS. AFTER A COOLER DAY ON TUESDAY...H7 TEMPERATURES WILL CLIMB TO AROUND 10C BY WEDNESDAY AND 15C FOR THURSDAY THROUGH SATURDAY. SO AFTERNOON HIGHS IN THE 60S ON TUESDAY WILL CLIMB INTO THE 70S FOR WEDNESDAY...AND INTO THE 80S FOR THURSDAY THROUGH SATURDAY. AVIATION...12Z TAF ISSUANCE... AFTER A QUIET VFR MORNING...EXPECT CLOUDS TO THICKEN AS SHOWERS AND THUNDERSTORMS DEVELOP BY THIS AFTERNOON AND EVENING. THE BEST CHANCE TO SEE THESE THUNDERSTORMS WILL BE AT AIRFIELDS EAST OF THE LARAMIE RANGE. IN FACT...A FEW OF THESE THUNDERSTORMS MAY BECOME STRONG TO SEVERE CONTAINING HAIL AND DAMAGING WINDS ACROSS NEBRASKA AIRPORTS. CIGS/VSBYS MAY BE REDUCED BRIEFLY WITHIN THESE THUNDERSTORMS TO THE MVFR CATEGORY. HOWEVER...WITH LIMITED CONFIDENCE ON CONVECTIVE TIMING AND COVERAGE...WILL KEEP TAF SITES IN VFR WITH VCTS...UNTIL SPECIFICS BECOME CLEARER. FIRE WEATHER... NO FIRE WEATHER CONCERNS AT THIS TIME DUE TO FIRE DANGER IN THE LOW CATEGORY AND EXPECTED WETTING RAIN ACROSS THE DISTRICT THROUGH SUNDAY NIGHT. HYDROLOGY... RAINFALL FROM A QUARTER INCH TO LOCALLY OVER AN INCH IS PREDICTED FOR THE CWA TODAY THROUGH MONDAY...WHICH MAY FURTHER AGGRAVATE THE ONGOING FLOODING CONCERNS. FLOOD WARNINGS REMAIN IN EFFECT FOR THE UPPER NORTH PLATTE RIVER DUE TO SNOW MELT AND RUNOFF FROM THE SIERRA MADRE AND SNOWY RANGES. THE RATE OF SNOW MELT WILL DECREASE SLIGHTLY TODAY THROUGH TUESDAY AS MOUNTAIN TEMPERATURES WILL BE COOLER. HOWEVER THE HIGH WATER LEVELS WILL CONTINUE. FLOOD WARNINGS ALSO REMAIN IN EFFECT FOR THE NORTH PLATTE RIVER AT HENRY...MITCHELL AND MINATARE. && .CYS WATCHES/WARNINGS/ADVISORIES... WY...FLOOD WATCH FROM NOON SUNDAY TO MIDNIGHT TUESDAY FOR WYZ110. NE...NONE. && SHORT TERM...TJT LONG TERM/AVIATION...JAMSKI
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHEYENNE WY 1032 AM MDT SAT JUN 18 2011 WYZ101>118-191645- 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- 1032 AM MDT SAT JUN 18 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST WYOMING. .DAY ONE...TODAY AND TONIGHT ISOLATED SHOWERS AND THUNDERSTORMS WILL DEVELOP EARLY THIS AFTERNOON AND BECOME SCATTERED IN AREAS CLOSE TO THE NEBRASKA STATE LINE. BRIEF HEAVY RAIN...SMALL HAIL...AND OCCASIONAL LIGHTNING WILL BE THE PRIMARY IMPACTS WITH THESE THUNDERSTORMS. THUNDERSTORMS WILL WEAKEN...TURNING TO RAIN SHOWERS BY AROUND MIDNIGHT. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY A STRONG LOW PRESSURE SYSTEM WILL MOVE INTO NORTHERN COLORADO SUNDAY AFTERNOON AND SLOWLY MOVE THROUGH THE AREA THROUGH MONDAY. THIS LOW IS EXPECTED TO BRING WIDESPREAD RAINFALL WITH MODERATE TO LOCALLY HEAVY RAINFALL POSSIBLE. SOME SEVERE STORMS ARE EXPECTED SUNDAY AFTERNOON AND EVENING EAST OF THE LARAMIE RANGE. MODERATE FLOODING WILL CONTINUE ON THE RIVERS FLOWING FROM THE SNOWY AND SIERRA MADRE RANGES. ADDITIONAL WIDESPREAD RAIN OVER THESE ALREADY FLOODING RIVERS MAY CAUSE SIGNIFICANT FURTHER RISES ON AREA RIVERS LATE THIS WEEKEND AND EARLY NEXT WEEK. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED TODAY AND TONIGHT. SPOTTERS ARE ENCOURAGED TO REPORT HAIL OF ANY SIZE AND WIND DAMAGE TO THE NATIONAL WEATHER SERVICE. && 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-WYZ119-191645- DAWES-BOX BUTTE-SCOTTS BLUFF-BANNER-MORRILL-KIMBALL-CHEYENNE- NORTH SIOUX-SOUTH SIOUX-EAST LARAMIE COUNTY- 1032 AM MDT SAT JUN 18 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE WESTERN NEBRASKA PANHANDLE AND EASTERN LARAMIE COUNTY IN WYOMING. .DAY ONE...TODAY AND TONIGHT SCATTERED SHOWERS AND THUNDERSTORMS WILL DEVELOP ACROSS THE WESTERN NEBRASKA PANHANDLE BY THE MIDDLE OF THE AFTERNOON. A FEW THUNDERSTORMS MAY BECOME SEVERE...CONTAINING LARGE HAIL AND DAMAGING WINDS...LATE THIS AFTERNOON. HEAVY RAIN MAY ALSO ACCOMPANY THESE THUNDERSTORMS WHICH MAY CAUSE ADDITIONAL FLOODING NEAR THE NORTH PLATTE AND ITS TRIBUTARIES. THUNDERSTORMS WILL WEAKEN...TURNING TO RAIN SHOWERS BY AROUND MIDNIGHT. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY A STRONG LOW PRESSURE SYSTEM IS EXPECTED TO MOVE INTO NORTHERN COLORADO SUNDAY AFTERNOON AND SLOWLY MOVE THROUGH THE AREA THROUGH MONDAY. THIS LOW IS EXPECTED TO BRING WIDESPREAD RAINFALL WITH MODERATE TO HEAVY RAINFALL EXPECTED. SEVERE THUNDERSTORMS ARE POSSIBLE SUNDAY AFTERNOON AND EVENING. MINOR TO MODERATE FLOODING WILL CONTINUE ON THE RIVERS FLOWING FROM THE SOUTHEAST WYOMING MOUNTAINS. ADDITIONAL WIDESPREAD RAIN OVER THE ALREADY FLOODING NORTH PLATTE RIVER MAY CAUSE SIGNIFICANT FURTHER RISES LATE THIS WEEKEND AND EARLY NEXT WEEK. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS POSSIBLE TODAY AND TONIGHT. && THIS PRODUCT...ALONG WITH OTHER WEATHER...HYDROLOGIC...AND CLIMATE INFORMATION IS AVAILABLE ON THE WEB AT... HTTP://WEATHER.GOV/CHEYENNE TT
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 1135 AM MDT SAT JUN 18 2011 WYZ118-119-181815- CENTRAL LARAMIE COUNTY WY-EAST LARAMIE COUNTY WY- 1135 AM MDT SAT JUN 18 2011 ...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL LARAMIE COUNTY UNTIL 1215 PM MDT... AT 1131 AM MDT...STORM SPOTTERS REPORTED A STRONG THUNDERSTORM 6 MILES EAST OF CHEYENNE...MOVING EAST AT 25 MPH. HAIL UP TO THE SIZE OF PENNIES AND WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THIS STORM. LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE... BURNS... HILLSDALE... I-80 EXIT 386... THIS INCLUDES INTERSTATE 80 IN WYOMING BETWEEN MILE MARKERS 366 AND 396. TJT
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
1137 AM MDT SAT JUN 18 2011
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1112 AM HAIL 2 W CHEYENNE 41.15N 104.83W
06/18/2011 E0.75 INCH LARAMIE WY PUBLIC
SHREDDED LEAVES AND LEFT CAR DENTS.
&&
DDEALSPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 107 PM MDT SAT JUN 18 2011 NEZ019-020-WYZ108-181945- BANNER NE-GOSHEN COUNTY WY-SCOTTS BLUFF NE- 107 PM MDT SAT JUN 18 2011 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN GOSHEN... SOUTHWESTERN SCOTTS BLUFF AND NORTHWESTERN BANNER COUNTIES UNTIL 145 PM MDT... AT 102 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 10 MILES SOUTHWEST OF HAWK SPRINGS...OR 28 MILES SOUTHWEST OF TORRINGTON...MOVING EAST AT 25 MPH. HAIL UP TO THE SIZE OF NICKELS AND WIND GUSTS UP TO 50 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN. LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE... HAWK SPRINGS... HAWK SPRINGS RECREATION AREA... LA GRANGE... HWY 85 MM 60... HWY 85 AT HIGHWAY 151... TORRENTIAL RAIN...WHICH MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND UNDERPASSES...IS ALSO LIKELY. DO NOT DRIVE YOUR VEHICLE ON A FLOODED ROADWAY. TJT
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
200 PM MDT SAT JUN 18 2011
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0200 PM TORNADO 3 W MITCHELL 41.94N 103.87W
06/18/2011 SCOTTS BLUFF NE LAW ENFORCEMENT
TORNADO ON THE GROUND 3 MILES WEST OF MITCHELL MOVING
NORTHEAST.
&&
TTRUDELThe Cheyenne radar (KCYS), 119 km away, was scanning. The volume nearest the first event began at 20:02 UTC.
1 tornado. Local standard time, as filed.
Law enforcement reported a tornado on the ground moving to the northeast.
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: 304277.