Hail, Pennington
- When
- August 15, 2:47 PM MST to 2:53 PM MST
- Where
- Pennington County, 2 mi W of Keystone
- Measured
- 0.75 in hail
- Reported by
- PARK/FOREST SERVICE
- Coordinates
- 43.900, -103.450
Hail and Damaging Wind in South Dakota, August 15, 2001
1 hail, 1 thunderstorm wind, as filed by the National Weather Service.
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
- 2
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 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 Aug 15, 1:26 PM MST, 1 hour 21 minutes earlier.
Area forecast discussion, Aug 15, 1:26 PM MST, 1 hour 21 minutes before
AREA FORECAST DISCUSSION FOR WESTERN SD AND NORTHEASTERN WY NATIONAL WEATHER SERVICE RAPID CITY SD 230 PM WED AUG 15 2001 AFTN HEATING HAS DESTABILIZED AMS ACRS CWFA. WEAK FORCING ASSOCIATED WITH UPR TROF/SECONDARY COLD FNT ENOUGH TO TRIGGER SOME CONVECTION. EXPECT THIS ACTIVITY TO DIE THIS EVE WITH LOSS OF HEATING. DRY NORTHWEST FLOW ALOFT WILL CONTINUE TO INFLUENCE REGIONS WEATHER THRU PD...KEEPING TEMPS IN LINE WITH SEASONAL NORMS. A FEW WIGGLES IN FLOW ALOFT ADVECT THRU AREA...BUT EXPECT AMS TO BE TOO DRY FOR MUCH ACTIVITY. THUS WILL GO WITH DRY FCST. MOS TEMPS LOOK IN LINE. EXTENDED...UPR RIDGING SHOULD KEEP AREA DRY ON SAT. HOWEVER...RIDGE FLATTENS A BIT BEGINNING SUN ALLOWING PAC SHORT WAVES TO MOVE THROUGH THE NRN PLAINS. BY WED...LATEST MRF WANTS TO AMPLIFY RIDGE ACRS NRN PLAINS AGAIN IN RESPONSE TO LOW DIGGING OFF W COAST. ECMWF/ENSEMBLES NOT IN COMPLETE AGREEMENT...SO WILL LEAVE CHC POPS IN FOR WED. UNR...NONE. JOHNSON
In the hours before
Special weather statement, Aug 15, 9:26 AM MST, 5 hours 21 minutes before
SDZ001-002-012>014-024>032-041>044-046-047-049-WYZ054>058-151930- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE RAPID CITY SD 1026 AM MDT WED AUG 15 2001 THUNDERSTORMS ARE NOT EXPECTED TO BE SEVERE OVER NORTHEASTERN WYOMING AND WESTERN SOUTH DAKOTA THIS AFTERNOON AND EVENING. HOWEVER...ANY THUNDERSTORMS THAT DO DEVELOP MAY PRODUCE BRIEF RAIN SHOWERS...SMALL HAIL...AND GUSTY WINDS. .DISCUSSION... DAYTIME HEATING WILL HELP TO DESTABILIZE THE ATMOSPHERE ACROSS NORTHEASTERN WYOMING AND WESTERN SOUTH DAKOTA. A WEAK COLD FRONT CROSSING THE AREA THIS AFTERNOON WILL PROVIDE ADDED LIFT TO HELP TRIGGER A FEW THUNDERSTORMS. COUNTIES INCLUDED IN THIS OUTLOOK ARE...CUSTER...TRIPP...BENNETT... SHANNON...JACKSON...ZIEBACH...PERKINS...MEADE...BUTTE...HARDING... CROOK...CAMPBELL...LAWRENCE...MELLETTE...TODD...WESTON...HAAKON... FALL RIVER AND PENNINGTON. WCJIN-WYNE RICHARDS
The radar
The national radar mosaic for the moment the first event began.
Event by event
1 hail, 1 thunderstorm wind. Local standard time, as filed.
Thunderstorm Wind, Pennington
- When
- August 15, 3:05 PM MST
- Where
- Pennington County, Rockerville
- Measured
- 52 kt (60 mph)
- Reported by
- TRAINED SPOTTER
- Coordinates
- 43.950, -103.350
What these are
- Hail
- Hail three-quarters of an inch or larger, or smaller hail that caused damage, filed with the largest stone measured.
- Thunderstorm Wind
- Winds from a thunderstorm of 50 knots (58 mph) or more, or lower winds that caused damage or casualties. Measured gusts are marked MG, estimated EG.
After NWS Directive 10-1605, the rules offices file Storm Data by.
The same day elsewhere
- Lightning Strike in Colorado, August 15, 2001
- Damaging Winds and Lightning Strike in Texas, August 15, 2001
- Hail and Damaging Winds in Oklahoma, August 15, 2001
- Heat in Florida, August 15, 2001
- Damaging Winds in Oklahoma, August 15, 2001
- Hail and Damaging Wind in Texas, August 15, 2001
- Hail and Damaging Wind in Arizona, August 15, 2001
- Wildfire in Idaho, August 15, 2001
- Hail in North Dakota, August 15, 2001
- Lightning Strike in Wyoming, August 15, 2001
- Hail in Minnesota, August 15, 2001
- Hail in Minnesota, August 15, 2001
More
Every storm in South Dakota in 2001Every state in 2001This day in weather historyWarnings in South Dakota, August 2001
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: 5265941, 5265942.