A thunderstorm over northern Niobrara County produced large hail.
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The episode as NWS CYS wrote it up.
A thunderstorm over northern Niobrara County produced large hail.
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 Aug 4, 1:38 PM MST, 2 hours 52 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHEYENNE WY 238 PM MDT MON AUG 4 2014 .SHORT TERM...(THIS EVENING THROUGH TUESDAY EVENING) ISSUED AT 230 PM MDT MON AUG 4 2014 CURRENTLY...WATER VAPOR IMAGERY SHOWING MONSOONAL MOISTURE MOVING INTO OUR WESTERN ZONES THIS AFTERNOON AS THE UPPER LOW THAT WAS OVER SOUTHERN CALIFORNIA YESTERDAY MOVES INTO CENTRAL UTAH. 12Z PWATS ON THE GJT SOUNDING OVER 1.2 INCHES. THIS MOISTURE IS HEADED OUR WAY. MOSAIC RADAR SHOWING FAIRLY WIDESPREAD LIGHT RAIN OVER CARBON COUNTY. A FEW THUNDERSTORMS DEVELOPING NEAR ARLINGTON AND CENTENNIAL WITH A FEW LIGHTNING STRIKES OBSERVED. BEGINNING TO SEE SOME CELLS DEVELOPING ON THE RADAR UP BY VEDAUWOO...SO SHOWERS HERE AT CHEYENNE ARE NOT THAT FAR OFF. FOR THIS AFTERNOON...LATEST HRRR FORECAST SHOWING CELLS DEVELOPING OVER THE LARAMIE RANGE AND DRIFTING EAST. ITS SHOWING A FAIRLY WIDESPREAD BAND OF SHOWERS AND THUNDERSTORMS MOVING SLOWLY EAST INTO THE PANHANDLE AROUND THE 23Z TIME FRAME. STORMS ARE GOING TO BE VERY SLOW MOVING...FROM THE SOUTHWEST AT UNDER 5KTS. THOSE AREAS THAT DO EXPERIENCE THUNDERSTORMS THIS AFTERNOON AND THIS EVENING COULD SEE CONSIDERABLE RAINFALL WITH THESE SLOW MOVING STORMS. UPPER SHORTWAVE MOVES BEST LIFT NORTH THIS EVENING...SO WE SHOULD SEE A LULL IN CONVECTION AFTER 03Z OR SO UNTIL TUESDAY. DRIED OUT THE SOUTHERN PANHANDLE AND SOUTHEAST WYOMING FROM LARAMIE TO WHEATLAND TO TORRINGTON THIS EVENING. NEXT PIECE OF ENERGY TO MOVE THROUGH THE AREA TUESDAY AFTERNOON AND EVENING AS THE UPPER LOW OPENS UP AND TRACKS INTO WESTERN WYOMING. NAM AND ECMWF SHOW GOOD QPF ACROSS MOST OF THE CWFA...CONCENTRATED ACROSS THE SOUTHERN PANHANDLE AND LARAMIE COUNTY TUESDAY AFTERNOON. STILL NOT MUCH IN THE STEERING FLOW...SO STORMS WILL ONCE AGAIN BE SLOW MOVING AND PRODUCING MODERATE TO HEAVY RAINFALL INTO TUESDAY EVENING. .LONG TERM...(WEDNESDAY THROUGH MONDAY) ISSUED AT 1222 PM MDT MON AUG 4 2014 WEDNESDAY...DESPITE A SHORTWAVE RIDGE ALOFT OVER OUR COUNTIES...WITH A LOW LEVEL CONVERGENCE BOUNDARY INDICATED FROM DOUGLAS TO CHEYENNE...ALONG WITH ADEQUATE LOW AND MID LEVEL MOISTURE AND DECENT UPWARD VERTICAL MOTION FROM DOUGLAS TO CHEYENNE...HAVE BOOSTED AFTERNOON AND EVENING POPS INTO THE 45 TO 70 PERCENT RANGE...WITH LESSER POPS ELSEWHERE. WITH WEAK STEERING WINDS...WILL LIKELY SEE A FEW HEAVY RAINERS AS WELL. THURSDAY...NEXT SHORTWAVE TROUGH ALOFT MOVES INTO WESTERN WYOMING AND UTAH...WHILE A LOW LEVEL CONVERGENCE AXIS SETS UP FROM NORTH CENTRAL COLORADO NORTHWARD TO NEAR TORRINGTON TO NEAR CHADRON. 850/700 MB THETA-E RIDGE AXIS...WELL PRONOUNCED...WILL EXTEND NORTH TO SOUTH IN THE AFTERNOON ACROSS FAR EASTERN WYOMING AND WESTERN NEBRASKA...AND WITH PROGGED INSTABILITIES...CAPE AND DECENT DIRECTIONAL SHEAR...EXPECT A FEW STRONG TO SEVERE THUNDERSTORMS EAST OF A LUSK TO CHEYENNE LINE...AND HAVE ALSO BOOSTED POPS EAST OF THIS LINE TO THE 50 TO 60 PERCENT RANGE WITH ALL CONVECTIVE AND MESOSCALE PARAMETERS COMING TOGETHER. FRIDAY...LESS LATE DAY COVERAGE OF SHOWERS AND THUNDERSTORMS EXPECTED WITH DECREASE IN LOW AND MID LEVEL MOISTURE...THOUGH WILL STILL SEE ISOLATED TO SCATTERED SHOWERS AND THUNDERSTORMS IN THE AFTERNOON AND EVENING WITH MOIST UPSLOPE MECHANICAL LIFT. SATURDAY...SIMILAR SCENARIO TO FRIDAY...ALBEIT WITH SLIGHTLY LESS COVERAGE OF SHOWERS AND THUNDERSTORMS DUE TO LESS LOW AND MID LEVEL MOISTURE AVAILABILITY. SUNDAY...RIDGING ALOFT STRENGTHENS OVER OUR COUNTIES...THUS EXPECT SLIGHTLY LESS COVERAGE OF LATE DAY SHOWERS AND THUNDERSTORMS...FOCUSED ALMOST EXCLUSIVELY OVER THE MOUNTAINS AND HIGHER TERRAIN SUCH AS THE PINE RIDGE FROM NEAR LUSK TO NEAR CHADRON. MONDAY...EVEN MORE PRONOUNCED RIDGING ALOFT...AND WITH THE BULK OF THE MONSOONAL MOISTURE RESIDING OVER COLORADO...WILL ONLY FORECAST ISOLATED LATE DAY THUNDERSTORMS OVER AND NEAR THE SNOWY...SIERRA MADRE AND SOUTHERN LARAMIE RANGES...THOUGH WE WILL NEED TO WATCH FOR POSSIBLE GREATER INTRUSION OF MID LEVEL MONSOONAL MOISTURE AS IS TYPICAL FOR LATE JULY AND EARLY AUGUST. && .AVIATION...(FOR THE 18Z TAFS THROUGH 18Z TUESDAY MORNING) ISSUED AT 1057 AM MDT MON AUG 4 2014 EXPECT CONVECTION TO CONTINUE EXPANDING THIS AFTERNOON...IMPACTING OUR SOUTHEAST WYOMING AIRPORTS. INITIALLY BEGINNING OVER KRWL...THEN EXPANDING EASTWARD TO KLAR AND KCYS. SHOWERS COULD BE HEAVY AT TIMES...REDUCING VISIBILITIES DOWN TO 3 MILES AT TIMES. THIS CONVECTION WILL THEN SPREAD OUT INTO THE NEBRASKA PANHANDLE SHORTLY BEFORE AND A FEW HOURS AFTER 00Z. LATEST SREF GUIDANCE SHOWING MVFR/IFR CEILINGS DEVELOPING IN THE NORTHERN NEBRASKA PANHANDLE...IMPACTING KCDR AND POSSIBLY KAIA TUESDAY MORNING. && .FIRE WEATHER... ISSUED AT 230 PM MDT MON AUG 4 2014 MONSOONAL MOISTURE WILL STAY WITH US THROUGH MOST OF THE WEEK GIVING MOST AREAS CHANCES FOR WETTING RAINS AND THUNDERSTORMS ON A DAILY BASIS. WINDS TO REMAIN WEAK AND AFTERNOON HUMIDITIES FAIRLY HIGH...MITIGATING ANY FIRE WEATHER CONCERNS. MIN HUMIDITIES EXPECTED TO STAY IN THE MID 20 PERCENT RANGE THROUGH THE WEEK WITH EXCELLENT OVERNIGHT RECOVERIES. && .CYS WATCHES/WARNINGS/ADVISORIES... WY...NONE. NE...NONE. && SHORT TERM...CLAYCOMB LONG TERM...RUBIN AVIATION...CLAYCOMB FIRE WEATHER...CLAYCOMB
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHEYENNE WY 407 AM MDT MON AUG 4 2014 WYZ101>119-051015- 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- 407 AM MDT MON AUG 4 2014 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL WYOMING... SOUTH CENTRAL WYOMING AND SOUTHEAST WYOMING. .DAY ONE...TODAY AND TONIGHT SHOWERS AND THUNDERSTORMS ARE POSSIBLE ACROSS MUCH OF THE AREA THIS AFTERNOON AND EVENING. THESE STORMS ARE NOT EXPECTED TO BE SEVERE. HOWEVER...A FEW STRONGER STORMS COULD PRODUCE SMALL HAIL AND GUSTY WINDS. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY THERE IS A DAILY RISK FOR SHOWERS AND THUNDERSTORMS ACROSS PARTS OF SOUTHEAST WYOMING THROUGH SATURDAY. WIDESPREAD SEVERE WEATHER IS NOT EXPECTED AT THIS TIME. .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>021-054-055-095-096-051015- DAWES-BOX BUTTE-SCOTTS BLUFF-BANNER-MORRILL-KIMBALL-CHEYENNE- NORTH SIOUX-SOUTH SIOUX- 407 AM MDT MON AUG 4 2014 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE WESTERN NEBRASKA PANHANDLE. .DAY ONE...TODAY AND TONIGHT SHOWERS AND THUNDERSTORMS ARE POSSIBLE ACROSS MUCH OF THE AREA THIS AFTERNOON AND EVENING. THESE STORMS ARE NOT EXPECTED TO BE SEVERE. HOWEVER...A FEW STRONGER STORMS COULD PRODUCE SMALL HAIL AND GUSTY WINDS. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY THERE IS A DAILY RISK FOR SHOWERS AND THUNDERSTORMS ACROSS THE WESTERN NEBRASKA PANHANDLE THROUGH SATURDAY. WIDESPREAD SEVERE WEATHER IS NOT EXPECTED AT THIS TIME. .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 HAMMER
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 328 PM MDT MON AUG 4 2014 WYZ108-042200- GOSHEN COUNTY WY- 328 PM MDT MON AUG 4 2014 ...SIGNIFICANT WEATHER ADVISORY FOR EASTERN GOSHEN COUNTY UNTIL 400 PM MDT... AT 323 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR YODER...OR 14 MILES SOUTH OF TORRINGTON... MOVING EAST AT 5 MPH. HAIL UP TO THE SIZE OF PENNIES IS EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN. LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE... MAINLY RURAL AREAS OF CENTRAL GOSHEN COUNTY. 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. && LAT...LON 4190 10409 4177 10416 4187 10435 4193 10430 TIME...MOT...LOC 2128Z 282DEG 4KT 4188 10425 MAZUR
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 458 PM MDT MON AUG 4 2014 WYZ102-042330- NIOBRARA COUNTY WY- 458 PM MDT MON AUG 4 2014 ...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN NIOBRARA COUNTY UNTIL 530 PM MDT... AT 455 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 11 MILES SOUTHWEST OF REDBIRD...OR 28 MILES NORTH OF LUSK...MOVING NORTHEAST AT 20 MPH. HAIL UP TO THE SIZE OF PENNIES AND WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN. LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE... REDBIRD... 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. && LAT...LON 4346 10447 4332 10409 4306 10439 4316 10463 TIME...MOT...LOC 2258Z 211DEG 18KT 4318 10445 MAZUR
The Rapid City radar (KUDX), 148 km away, was scanning. The volume nearest the first event began at 23:30 UTC.
1 hail. Local standard time, as filed.
Quarter size hail was reported seven miles west of Mule Creek Junction.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wyoming in 2014Every state in 2014This day in weather historyWarnings in Wyoming, August 2014
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: 525924.