Hail, Weston
- When
- June 20, 3:45 PM MST
- Where
- Weston County, 18.86 mi SW of Upton
- Measured
- 0.88 in hail
- Reported by
- Trained Spotter
- Coordinates
- 43.931, -104.928
Hail in Wyoming, June 20, 2015
A supercell thunderstorm developed over northwestern Weston County and tracked southeastward across the county and eventually into South Dakota. The storm produced large hail along its path.
Where it happened
Every event with a place to put it. Tap one for its entry below.
- Tornadoes
- Tropical storms and surge
- Floods
- Wind
- Hail
- Winter weather
- Heat and drought
- Cold
- Fire, smoke and dust
- Marine and coastal
- Other
The toll
- Deaths
- 0
- Injuries
- 0
- Property damage
- None recorded
- Crop damage
- None recorded
- Events
- 4
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.
What happened
The episode as NWS UNR wrote it up.
A supercell thunderstorm developed over northwestern Weston County and tracked southeastward across the county and eventually into South Dakota. The storm produced large hail along its path.
What forecasters said that day
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 Rapid City, SD wrote its last area forecast discussion before the first event at Jun 20, 1:07 PM MST, 2 hours 38 minutes earlier.
Area forecast discussion, Jun 20, 1:07 PM MST, 2 hours 38 minutes before
AREA FORECAST DISCUSSION FOR WESTERN SD AND NORTHEASTERN WY NATIONAL WEATHER SERVICE RAPID CITY SD 207 PM MDT SAT JUN 20 2015 .SHORT TERM...THIS EVENING THROUGH SUNDAY NIGHT ISSUED AT 204 PM MDT SAT JUN 20 2015 ZONAL UPPER FLOW PERSISTS OVER THE NORTHERN PLAINS...WITH THE NOSE OF 90KT JET STREAK APPROACHING THE REGION. HIGH PRESSURE BEHIND THE COLD FRONT IS KEEPING SKIES MOSTLY SUNNY WITH LIGHT WINDS. HOWEVER...A COUPLE WEAK SHOWERS HAVE DEVELOPED OVER NORTHWESTERN SD AND CUMULUS ARE POPPING UP OVER THE BLACK HILLS AND NORTHEASTERN WYOMING. TEMPS ARE IN THE 70S...WITH DEW POINTS IN THE 50S TO LOWER 60S. TONIGHT A WEAK UPPER SHORTWAVE WILL PASS OVER THE REGION...WHILE RETURN FLOW BEHIND THE EXITING SURFACE HIGH...ALBEIT LIGHT...RESULTS IN SOME THETA-E ADVECTION ACROSS THE SOUTHWESTERN CWA. WITH EXCELLENT 0-6 KM SHEAR...SUPERCELLS COULD DEVELOP...BUT CAPE IS NOT TOO IMPRESSIVE AT 1500 J/KG. NEAR-TERM MODELS ARE IN POOR AGREEMENT ON CONVECTION TONIGHT...BUT BELIEVE THE BEST CHANCE FOR STRONG TO SEVERE STORMS WILL BE ACROSS PARTS OF NORTHEASTERN WY...THE BLACK HILLS...AND SOUTHWESTERN SD OVERNIGHT. MAY BE SOME LINGERING SHOWERS/STORMS OVER CENTRAL SD SUNDAY MORNING...BUT A MAINLY DRY DAY IS EXPECTED. ANOTHER WEAK WAVE WILL MOVE THROUGH THE REGION LATE SATURDAY. STRONGER RETURN FLOW WILL SET UP ACROSS THE REGION DURING THE AFTERNOON...AND MLCAPE VALUES WILL RISE NEAR 3500 J/KG. HOWEVER...FORECAST SOUNDINGS INDICATE A STRONG CAP OVER MUCH OF THE CWA...AND SO EXPECT THE MAJORITY OF SHOWERS/STORMS TO BE OVER NORTH DAKOTA WHERE THERE IS LESS CIN AND STRONGER FORCING. AS SHORTWAVE TROUGH AXIS PASSES THROUGH WESTERN SD SUNDAY NIGHT...SHOWERS AND THUNDERSTORMS TO THE NORTH AND EAST OF THE LOW ARE POSSIBLE ACROSS NORTHWEST INTO CENTRAL SD. HIGHS SUNDAY WILL BE IN THE 80S...WITH LOWS IN THE MID 50S TO MID 60S. .LONG TERM...MONDAY THROUGH SATURDAY ISSUED AT 204 PM MDT SAT JUN 20 2015 SEMI-FLAT PROGRESSIVE WESTERLY FLOW WILL CONTINUE THROUGH MUCH OF THE EXTENDED. THIS WILL SUPPORT NEAR DAILY CHANCES FOR SHRA TS AS SMALL SCALE MID LEVEL IMPULSES TRAVERSE THE REGION. CERTAINLY NOT A WASH OUT. HOWEVER...TIMING OF LOW AMPLITUDE IMPULSES IN FAST WESTERLY FLOW PRECLUDE FAVORING ANY DRY PERIODS MOST OF NEXT WEEK. GROWING INDICATIONS FOR MASSIVE WESTERN NOAM RIDGING PER EASTERN PAC TOUGHING...WITH DOWNSTREAM RIDGING OVER THE EASTERN NOAM. THIS WOULD SUPPORT WARMER AND DRIER CONDS BY NEXT WEEKEND. HOWEVER THE REGION LOOKS TO REMAIN ON THE EDGE OF THE RIDGE WITH POTENTIAL NW FLOW IMPULSES AFFECTING THE FA. THIS WOULD FAVOR A WESTERN BIAS TO ANY LARGE SCALE RIDGING...ESP GIVEN ONGOING MOIST SFC CONDS WHICH WOULD TEND TO SUPPORT A POSITIVE FEEDBACK MECHANISM. RETAINED NEAR DAILY CHANCES FOR SHRA/TS ALTHOUGH DID TREND DRY MONDAY AND SAT WHERE THE STRONGEST INDICATIONS FOR DEEP LAYER RIDGING EXISTS. TEMPS WILL REMAIN SEASONAL TO ON THE COOL SIDE OF NORMAL MOST OF NEXT WEEK...WITH WARMER WEATHER LOOKING ON TRACK FOR NEXT WEEKEND. && .AVIATION...FOR THE 18Z TAFS THROUGH 18Z SUNDAY ISSUED AT 204 PM MDT SAT JUN 20 2015 MAINLY VFR CONDITIONS WILL PREVAIL TODAY. THERE IS ANOTHER CHANCE OF THUNDERSTORMS OVER AND NEAR THE BLACK HILLS THIS AFTN WITH A BETTER CHANCE OF THUNDERSTORMS OVER NORTHEASTERN WYOMING AND WESTERN SOUTH DAKOTA THIS EVENING AND OVERNIGHT. && .UNR WATCHES/WARNINGS/ADVISORIES... SD...NONE. WY...NONE. && SHORT TERM...POJORLIE LONG TERM...JC AVIATION...JC
Hazardous weather outlook, Jun 20, 5:10 AM MST, 10 hours 35 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE RAPID CITY SD 610 AM MDT SAT JUN 20 2015 SDZ001-002-012>014-024>032-041>044-046-047-049-072>074-WYZ054>058- 071-211300- HARDING-PERKINS-BUTTE-NORTHERN MEADE CO PLAINS-ZIEBACH- NORTHERN BLACK HILLS-NORTHERN FOOT HILLS-RAPID CITY- SOUTHERN FOOT HILLS-CENTRAL BLACK HILLS-SOUTHERN BLACK HILLS- CUSTER CO PLAINS-PENNINGTON CO PLAINS-HAAKON-FALL RIVER-SHANNON- JACKSON-BENNETT-MELLETTE-TODD-TRIPP-STURGIS/PIEDMONT FOOT HILLS- SOUTHERN MEADE CO PLAINS-HERMOSA FOOT HILLS-NORTHERN CAMPBELL- SOUTHERN CAMPBELL-WESTERN CROOK-WYOMING BLACK HILLS-WESTON- NORTHEASTERN CROOK- 610 AM MDT SAT JUN 20 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN SOUTH DAKOTA AND NORTHEASTERN WYOMING. .DAY ONE...TODAY AND TONIGHT THERE IS A MARGINAL RISK FOR SEVERE THUNDERSTORMS ACROSS PARTS OF NORTHEAST WYOMING AND MUCH OF WESTERN SOUTH DAKOTA LATE THIS AFTERNOON INTO TONIGHT. A FEW STORMS COULD PRODUCE LARGE HAIL...STRONG WIND GUSTS...AND HEAVY RAIN. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY FOR SUNDAY INTO NEXT WEEK...ADDITIONAL WEATHER DISTURBANCES WILL BRING CHANCES FOR THUNDERSTORMS THROUGH AT LEAST THURSDAY...WITH A FEW STRONGER STORMS POSSIBLE...MAINLY DURING THE LATE AFTERNOON AND EVENING HOURS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY. && STAY TUNED TO NOAA WEATHER RADIO FOR FURTHER DETAILS OR UPDATES... OR CHECK OUR WEB SITE AT WEATHER.GOV/RAPIDCITY
In the hours before
Special weather statement, Jun 20, 2:36 PM MST, 1 hour 9 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RAPID CITY SD 336 PM MDT SAT JUN 20 2015 SDZ012-013-073-202200- BUTTE SD-NORTHERN MEADE CO PLAINS SD-SOUTHERN MEADE CO PLAINS SD- 336 PM MDT SAT JUN 20 2015 ...STRONG THUNDERSTORM OVER WEST CENTRAL MEADE AND SOUTHEASTERN BUTTE COUNTIES... AT 335 PM MDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 14 MILES NORTHWEST OF HEREFORD...OR 22 MILES EAST OF STURGIS...MOVING EAST AT 25 MPH. NICKEL SIZE HAIL AND WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH THIS STORM. THIS STORM WILL REMAIN OVER MAINLY RURAL AREAS OF WEST CENTRAL MEADE AND SOUTHEASTERN BUTTE COUNTIES...NORTHWEST OF HEREFORD. LAT...LON 4445 10319 4457 10332 4470 10297 4445 10281 TIME...MOT...LOC 2135Z 248DEG 22KT 4452 10310 JC
Special weather statement, Jun 20, 2:48 PM MST, 57 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RAPID CITY SD
348 PM MDT SAT JUN 20 2015
SDZ013-014-202230-
ZIEBACH SD-NORTHERN MEADE CO PLAINS SD-
348 PM MDT SAT JUN 20 2015
...STRONG THUNDERSTORMS OVER NORTHEASTERN MEADE AND SOUTHERN ZIEBACH
COUNTIES...
AT 347 PM MDT...DOPPLER RADAR WAS TRACKING A LINE OF STRONG
THUNDERSTORMS ALONG A LINE EXTENDING FROM NEAR RED ELM TO 8 MILES
SOUTHEAST OF FAITH...AND MOVING SOUTHEAST AT 25 MPH.
NICKEL SIZE HAIL AND WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH
THESE STORMS.
LOCATIONS IMPACTED INCLUDE...
DUPREE...RED ELM AND RED SCAFFOLD.
LAT...LON 4508 10149 4500 10150 4499 10124 4470 10173
4489 10209 4511 10170
TIME...MOT...LOC 2147Z 298DEG 23KT 4505 10172 4492 10195
JCLocal storm report, Jun 20, 3:05 PM MST, 40 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RAPID CITY SD
405 PM MDT SAT JUN 20 2015
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0857 PM TORNADO 6 NW HEREFORD 44.44N 102.97W
06/19/2015 MEADE SD NWS STORM SURVEY
STORM SURVEY CONCLUDED AN EF-2 TORNADO WITH 115-120MPH
WINDS TOUCHED DOWN 6 MILES NORTHWEST OF HEREFORD AT
857PM MDT AND STAYED ON THE GROUND UNTIL 930PM MDT 5
MILES SOUTHWEST OF ELM SPRINGS. THE PATH LENGTH WAS 20.8
MILES AND THE MAXIMUM PATH WIDTH WAS 440 YARDS.
&&
MCKEMYSpecial weather statement, Jun 20, 3:12 PM MST, 33 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RAPID CITY SD 412 PM MDT SAT JUN 20 2015 WYZ055-057-058-202300- SOUTHERN CAMPBELL WY-WYOMING BLACK HILLS WY-WESTON WY- 412 PM MDT SAT JUN 20 2015 ...SIGNIFICANT WEATHER ADVISORY FOR EAST CENTRAL CAMPBELL AND WESTERN WESTON COUNTIES UNTIL 500 PM MDT... AT 411 PM MDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 19 MILES SOUTH OF ROZET...OR 24 MILES NORTHEAST OF WRIGHT...MOVING EAST AT 35 MPH. NICKEL SIZE HAIL AND WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH THIS STORM. LOCATIONS IMPACTED INCLUDE... UPTON...OSAGE AND CLARETON. PRECAUTIONARY/PREPAREDNESS ACTIONS... TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD TO MINOR FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS. && LAT...LON 4394 10529 4410 10525 4412 10438 4361 10452 TIME...MOT...LOC 2211Z 284DEG 33KT 4400 10515 AWARD
Special weather statement, Jun 20, 3:19 PM MST, 26 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RAPID CITY SD 419 PM MDT SAT JUN 20 2015 SDZ072-073-202245- SOUTHERN MEADE CO PLAINS SD-STURGIS/PIEDMONT FOOT HILLS SD- 419 PM MDT SAT JUN 20 2015 ...STRONG THUNDERSTORM OVER SOUTHWESTERN MEADE COUNTY... AT 418 PM MDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 8 MILES SOUTHEAST OF BEAR BUTTE STATE PARK...OR 11 MILES EAST OF STURGIS...MOVING EAST AT 30 MPH. DIME SIZE HAIL AND WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH THIS STORM. THIS STORM WILL REMAIN OVER MAINLY RURAL AREAS OF SOUTHWESTERN MEADE COUNTY WEST OF HEREFORD. PRECAUTIONARY/PREPAREDNESS ACTIONS... CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM. LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE SHELTER INSIDE A BUILDING OR VEHICLE. && LAT...LON 4435 10334 4451 10335 4448 10296 4425 10305 TIME...MOT...LOC 2218Z 277DEG 26KT 4441 10328 JC
Local storm report, Jun 20, 3:42 PM MST, 3 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RAPID CITY SD
442 PM MDT SAT JUN 20 2015
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0426 PM TSTM WND GST 14 SSE DUPREE 44.86N 101.48W
06/20/2015 E60 MPH ZIEBACH SD PUBLIC
LOTS OF PEA SIZE HAIL THAT COVERED THE GROUND
&&
MCKEMYThe radar
The Rapid City radar (KUDX), 169 km away, was scanning. The volume nearest the first event began at 22:44 UTC.
Event by event
4 hail. Local standard time, as filed.
Hail, Weston
- When
- June 20, 4:42 PM MST
- Where
- Weston County, 12.68 mi SSW of Newcastle
- Measured
- 1.75 in hail
- Reported by
- Trained Spotter
- Coordinates
- 43.670, -104.270
Hail, Weston
- When
- June 20, 4:45 PM MST
- Where
- Weston County, 14.86 mi S of Newcastle
- Measured
- 2.5 in hail
- Reported by
- Storm Chaser
- Coordinates
- 43.636, -104.190
Hail, Weston
- When
- June 20, 4:55 PM MST
- Where
- Weston County, 11.61 mi SSE of Newcastle
- Measured
- 1 in hail
- Reported by
- Trained Spotter
- Coordinates
- 43.696, -104.127
What these are
- Hail
- Hail three-quarters of an inch or larger, or smaller hail that caused damage, filed with the largest stone measured.
After NWS Directive 10-1605, the rules offices file Storm Data by.
The same day elsewhere
- Tornadoes and Hail in Iowa, June 20, 2015
- Damaging Winds in North Carolina, June 20, 2015
- Hail and Damaging Winds in Nebraska, June 20 to 21, 2015
- Tornadoes and Hail in Iowa, June 20, 2015
- Tornado and Hail in Virginia, June 20, 2015
- Hail and Damaging Wind in North Dakota, June 20, 2015
- Damaging Winds in South Dakota, June 20, 2015
- Hail and Damaging Winds in Illinois, June 20, 2015
- Flash Flooding and Damaging Winds in West Virginia, June 20, 2015
- Tornado and Damaging Winds in Virginia, June 20, 2015
- Hail and Damaging Winds in Indiana, June 20 to 21, 2015
- Damaging Winds in North Carolina, June 20, 2015
More
Every storm in Wyoming in 2015Every state in 2015This day in weather historyWarnings in Wyoming, June 2015
Sources
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: 584825, 584826, 584828, 584830.