Hail, Crook
- When
- June 7, 7:05 PM MST to 7:15 PM MST
- Where
- Crook County, 2.2 mi NE of Pine Haven
- Measured
- 1.75 in hail
- Reported by
- Trained Spotter
- Coordinates
- 44.383, -104.778
Hail in Wyoming, June 7, 2017
A thunderstorm briefly became severe over southwestern Crook County, with hail increasing from nickel size to golf ball sized at Keyhole State Park.
Where it happened
Every event with a place to put it. Tap one for its entry below.
- Tornadoes
- Tropical storms and surge
- Floods
- Wind
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- 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
- 1
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 thunderstorm briefly became severe over southwestern Crook County, with hail increasing from nickel size to golf ball sized at Keyhole State Park.
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 7, 4:42 PM MST, 2 hours 23 minutes earlier.
Area forecast discussion, Jun 7, 4:42 PM MST, 2 hours 23 minutes before
Area Forecast Discussion For Western SD and Northeastern WY National Weather Service Rapid City SD 542 PM MDT Wed Jun 7 2017 .DISCUSSION...(This Evening Through Wednesday) Issued at 315 PM MDT Wed Jun 7 2017 Current surface analysis shows low pressure over west central MN, with a frontal boundary stretching back southwest through northern SD into southeastern MT. Upper level analysis shows low pressure over far northwest MN with west-northwest flow over the northern high plains. Latest radar analysis shows convective development mostly limited to the higher terrain of the region, though some activity has also developed over southern portions of the Neb panhandle as well. KUDX radar shows a couple of storms over the northern into central Black Hills. Skies have clouded over across this area and the surrounding plains, with mostly sunny skies generally elsewhere. Temps are in the mid 70s to mid 80s most places, coolest across the Black Hills and north of the boundary over far northwest SD. Winds are variable and mostly on the light side. For the rest of this afternoon into this evening, the main chances for showers and storms will be over the Black Hills area and across southern portions of northeast WY as activity develops over these areas and moves in a south to southeast direction. There will still be the threat for a strong to severe storm or two through the early evening, with marginally severe hail and gusty winds the main concerns. This activity should weaken and move south of the area later this evening. However, low level southerly jet will increase across the western SD plains overnight, with decent theta-e advection to the north and east of the Black Hills. Could see mostly isolated showers and storms develop after 06z from near the Black Hills to south central SD. Lows tonight will be in the 50s and lower 60s, possibly some upper 40s over the higher Black Hills. A few showers could linger into Thursday morning toward south central SD. Otherwise, warmer air will continue to build in on southerly flow and building ridge. Highs will be in the 80s to near 90 on the plains, with 70s over the higher BH. Increasing moisture and instability from the Black Hills to south central SD will likely lead to another round of isolated to scattered storms across these areas in the afternoon and early evening. Strong to severe storms are certainly possible again, though shear still looks relatively weak for anything more than a short-lived supercell or two at this point. Ridge will build east over the area Friday, with warmest temps of the week for most areas. Highs will be in the 90s across much of the plains, with a few locations toward central SD likely near or around 100 degrees. Winds will turn more south-southwest ahead of approaching cold front and a dryline that will extend south into far northeast WY and the Black Hills. Drier air will push in with this flow and could produce briefly elevated fire wx conditions in some areas, especially from southern parts of northeast WY to far southwest SD. Cold front will only move slowly into and across the forecast area during the weekend, stalling out near the BH on Saturday and possibly into Sunday as well. Highs will range from the lower 80s over northeast WY to the mid 90s over south central SD. A few showers are possible across mainly far northwest SD Saturday night, otherwise it looks mainly dry at this point for the weekend. A low pressure system will move onto the west coast over the weekend and into the intermountain west early next week. This low will eventually push the ridge and cold front east of the region and bring a more unsettled and cooler weather pattern for early next week. Medium range models showing decent agreement on general track of upper low, but the exact track will determine the eastward extent of better pcpn chances early next week. Right now, the low is progged to track over the Northern Rockies Monday night and generally far northwest portions of the forecast area Tuesday and Tuesday night. This would limit best chances for pcpn to northeast WY, the Black Hills and parts of northwest SD late Monday through Tuesday night. Temperatures will drop back to near average levels by the middle of next week as the low eventually passes through the region. && .AVIATION...(For the 00Z TAFS Through 00Z Thursday Evening) Issued At 542 PM MDT Wed Jun 7 2017 Scattered showers and storms will continue into the evening hours across northeast WY, the Black Hills, and far southwest SD. MVFR conditions can be expected in and near heavier showers. Isolated showers and thunderstorms are possible late tonight into early Thursday, mainly across south central SD. Another round of showers and storms is expected again Thursday afternoon from the Black Hills to south central SD. && .UNR WATCHES/WARNINGS/ADVISORIES... SD...None. WY...None. && DISCUSSION...26 AVIATION...26
Hazardous weather outlook, Jun 7, 4:33 AM MST, 14 hours 32 minutes before
Hazardous Weather Outlook National Weather Service Rapid City SD 533 AM MDT Wed Jun 7 2017 SDZ024>031-041>044-046-047-049-072>074-WYZ054>058-071-081300- Northern Black Hills-Northern Foot Hills-Rapid City- Southern Foot Hills-Central Black Hills-Southern Black Hills- Custer Co Plains-Pennington Co Plains-Fall River-Oglala Lakota- 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- 533 AM MDT Wed Jun 7 2017 /633 AM CDT Wed Jun 7 2017/ This Hazardous weather outlook is for portions of south central South Dakota...the Black Hills of South Dakota...western South Dakota...northeast Wyoming...and the Black Hills of Wyoming. .DAY ONE...Today and Tonight Thunderstorms are possible this afternoon and tonight. Isolated severe thunderstorms may occur from about 300 PM to 900 PM. Large hail and damaging wind gusts will be the main threat. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday Thunderstorms are possible late Thursday afternoon and evening. Isolated severe thunderstorms may occur from about 500 PM to 1000 PM. Large hail and damaging wind gusts will be the main threat. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed today. && Stay tuned to NOAA weather radio for further updates...or check our web site at weather.gov/rapidcity SDZ001-002-012>014-032-081300- Harding-Perkins-Butte-Northern Meade Co Plains-Ziebach-Haakon- 533 AM MDT Wed Jun 7 2017 This Hazardous weather outlook is for portions of western South Dakota. .DAY ONE...Today and Tonight Isolated thunderstorms are possible later tonight. Severe thunderstorms are not expected. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday Thunderstorms are possible late Thursday afternoon and evening. Isolated severe thunderstorms may occur from about 500 PM to 1000 PM. Large hail and damaging wind gusts will be the main threat. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed today. && Stay tuned to NOAA weather radio for further updates...or check our web site at weather.gov/rapidcity
In the hours before
Special weather statement, Jun 7, 5:56 PM MST, 1 hour 9 minutes before
Special Weather Statement
National Weather Service Rapid City SD
656 PM MDT WED JUN 7 2017
WYZ056-058-080130-
Weston WY-Western Crook WY-
656 PM MDT WED JUN 7 2017
...SIGNIFICANT WEATHER ADVISORY FOR NORTH CENTRAL WESTON AND SOUTH
CENTRAL CROOK COUNTIES UNTIL 730 PM MDT...
At 656 PM MDT, Doppler radar was tracking a strong thunderstorm 10
miles southeast of Pine Haven, or 15 miles southwest of Sundance,
moving southeast at 15 mph.
Dime size hail will be possible with this storm.
This storm will remain over mainly rural areas of north central
Weston and south central Crook Counties north of Upton.
This Includes Interstate 90 in Wyoming between Mile Markers 166 and
172.
LAT...LON 4432 10460 4420 10448 4416 10448 4413 10466
4429 10474
TIME...MOT...LOC 0056Z 333DEG 15KT 4427 10463
CarstensSpecial weather statement, Jun 7, 6:27 PM MST, 38 minutes before
Special Weather Statement National Weather Service Rapid City SD 727 PM MDT WED JUN 7 2017 WYZ056>058-080200- Weston WY-Wyoming Black Hills WY-Western Crook WY- 727 PM MDT WED JUN 7 2017 ...SIGNIFICANT WEATHER ADVISORY FOR NORTH CENTRAL WESTON AND SOUTH CENTRAL CROOK COUNTIES UNTIL 800 PM MDT... At 727 PM MDT, Doppler radar was tracking a strong thunderstorm 8 miles west of Inyan Kara Mountain, or 14 miles southwest of Sundance, moving south at 10 mph. Dime size hail will be possible with this storm. Locations impacted include... Upton. LAT...LON 4425 10470 4431 10442 4408 10427 4408 10465 TIME...MOT...LOC 0127Z 345DEG 10KT 4422 10452 Carstens
Local storm report, Jun 7, 6:35 PM MST, 30 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RAPID CITY SD
735 PM MDT WED JUN 07 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0700 PM HAIL 7 SW WRIGHT 43.69N 105.63W
06/07/2017 M1.00 INCH CAMPBELL WY STORM CHASER
&&
EAGANLocal storm report, Jun 7, 6:40 PM MST, 25 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RAPID CITY SD
740 PM MDT WED JUN 07 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0700 PM HAIL 7 SW WRIGHT 43.69N 105.62W
06/07/2017 E1.00 INCH CAMPBELL WY STORM CHASER
TIME ESTIMATED BY RADAR
&&
EAGANSpecial weather statement, Jun 7, 6:58 PM MST, 7 minutes before
Special Weather Statement National Weather Service Rapid City SD 758 PM MDT WED JUN 7 2017 WYZ056-057-080230- Wyoming Black Hills WY-Western Crook WY- 758 PM MDT WED JUN 7 2017 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTH CENTRAL CROOK COUNTY UNTIL 830 PM MDT... At 758 PM MDT, Doppler radar was tracking a strong thunderstorm near Pine Haven, or 16 miles west of Sundance, moving southeast at 10 mph. Dime size hail will be possible with this storm. Locations impacted include... Eastern Keyhole Reservoir. This Includes Interstate 90 in Wyoming between Mile Markers 163 and 178. LAT...LON 4437 10481 4445 10464 4428 10444 4420 10476 TIME...MOT...LOC 0158Z 330DEG 9KT 4435 10471 Carstens
Special weather statement, Jun 7, 7:00 PM MST, 5 minutes before
Special Weather Statement National Weather Service Rapid City SD 800 PM MDT WED JUN 7 2017 WYZ058-080230- Weston WY- 800 PM MDT WED JUN 7 2017 ...SIGNIFICANT WEATHER ADVISORY FOR NORTH CENTRAL WESTON COUNTY UNTIL 830 PM MDT... At 800 PM MDT, Doppler radar was tracking a strong thunderstorm over Upton, or 23 miles southwest of Sundance, moving southeast at 5 mph. Nickel size hail will be possible with this storm. Locations impacted include... Upton. LAT...LON 4416 10476 4418 10456 4405 10445 4403 10469 TIME...MOT...LOC 0200Z 336DEG 4KT 4413 10465 Carstens
The radar
The Rapid City radar (KUDX), 158 km away, was scanning. The volume nearest the first event began at 02:03 UTC.
Event by event
1 hail. Local standard time, as filed.
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
- Heat in Texas, June 7, 2017
- Wildfire in Arizona, June 7 to 30, 2017
- Wildfire in Arizona, June 7 to 30, 2017
- Damaging Winds in Florida, June 7, 2017
- Tornadoes and Hail in North Dakota, June 7, 2017
- Marine Thunderstorm Winds in Gulf of Mexico, June 7, 2017
- Marine Thunderstorm Winds in Gulf of Mexico, June 7, 2017
- Hail and Damaging Wind in Nebraska, June 7, 2017
- Marine Thunderstorm Winds in South Atlantic Coastal Waters, June 7, 2017
- Marine Thunderstorm Winds and Waterspout in South Atlantic Coastal Waters, June 7, 2017
- Hail in New Mexico, June 7, 2017
- Flooding and Heavy Rain in Florida, June 7 to 8, 2017
More
Every storm in Wyoming in 2017Every state in 2017This day in weather historyWarnings in Wyoming, June 2017
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: 693529.