Hail in South Dakota, August 6, 2018

Name: Hail in South Dakota, August 6, 2018
Start: 2018-08-06T16:35
End: 2018-08-06T16:35
Location: South Dakota

August 6, 2018 · NWS UNR · 1 event in 1 county or zone

A severe thunderstorm produced large hail over portions of southwestern Oglala Lakota County before moving south into Nebraska.

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

Open the live radar over this ground

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 severe thunderstorm produced large hail over portions of southwestern Oglala Lakota County before moving south into Nebraska.

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 6, 12:50 PM MST, 3 hours 45 minutes earlier.

Area forecast discussion, Aug 6, 12:50 PM MST, 3 hours 45 minutes before

Area Forecast Discussion For Western SD and Northeastern WY
National Weather Service Rapid City SD
150 PM MDT Mon Aug 6 2018

.DISCUSSION...(This Evening Through Monday)
Issued at 146 PM MDT Mon Aug 6 2018

The latest water vapor images show a well-defined short-wave
trough/vort max moving right through the area with scattered
showers and thunderstorms developing, especially over the Black
Hills into southeastern MT. The MLCAPE was only 500-1000 J/kg. The
0-6km bulk wind shear was <30 knots over the northern half of the
CWA but 30-45 knots over the southern half. Thus, a storm or two
might get organized, but with limited CAPE and lapse rates of only
6.5-7.5 C/km, widespread severe weather is not expected.

The models agree well on the wave exiting the CWA around 06z, thus
bringing an end to the precip. Northwest flow aloft will prevail
through Thursday, along with very subtle/weak short-wave troughs
moving across the CWA. Moisture and instability (and thus CAPE) will
be rather limited, so at the most only expect an isolated storm
or two during this time (mostly likely confined to the Black
Hills). Otherwise, it will be warmer the rest of the week as
heights build aloft (topping out on Saturday). The result will be
high temperatures in the 80s to mid 90s for much of the area
(tempered somewhat by the relatively green/moist surface). The
ensemble guidance suggests that the ridge will break down Sunday
and Monday, allowing for a return to cooler weather.

&&

.AVIATION...(For the 18Z TAFS Through 18Z Tuesday)
Issued At 1220 PM MDT Mon Aug 6 2018

Showers and thunderstorms with areas MVFR conditions will
continue this afternoon, before decrease early this evening.

&&

.UNR WATCHES/WARNINGS/ADVISORIES...
SD...None.
WY...None.
&&

DISCUSSION...Bunkers
AVIATION...MLS

Hazardous weather outlook, Aug 6, 4:31 AM MST, 12 hours 4 minutes before

Hazardous Weather Outlook
National Weather Service Rapid City SD
531 AM MDT Mon Aug 6 2018

SDZ001-002-012>014-024>032-041>044-046-047-049-072>074-WYZ054>058-
071-071145-
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-
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-
531 AM MDT Mon Aug 6 2018 /631 AM CDT Mon Aug 6 2018/

This Hazardous Weather Outlook is for western South Dakota and
northeastern Wyoming.

.DAY ONE...Today and Tonight

There is a chance for thunderstorms this afternoon and evening.
While a stronger storm or two is possible from the Black Hills
into southwest South Dakota, widespread severe weather is not
expected.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

No hazardous weather is expected at this time.

.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, Aug 6, 2:57 PM MST, 1 hour 38 minutes before

Special Weather Statement
National Weather Service Rapid City SD
357 PM MDT MON AUG 6 2018

SDZ043-062245-
Jackson SD-
357 PM MDT MON AUG 6 2018

...STRONG THUNDERSTORM FOR CENTRAL JACKSON COUNTY UNTIL 445 PM MDT...

At 357 PM MDT, Doppler radar was tracking a strong thunderstorm 3
miles southeast of Cedar Pass, or 20 miles southwest of Kadoka,
moving east at 30 mph.

Dime size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Interior, Cedar Pass and Intersection of Highway 73 and White River.

LAT...LON 4366 10198 4375 10198 4382 10195 4375 10142
      4354 10152
TIME...MOT...LOC 2157Z 285DEG 28KT 4372 10189

Bunkers

Special weather statement, Aug 6, 3:06 PM MST, 1 hour 29 minutes before

Special Weather Statement
National Weather Service Rapid City SD
406 PM MDT MON AUG 6 2018

SDZ042-062245-
Oglala Lakota SD-
406 PM MDT MON AUG 6 2018

...STRONG THUNDERSTORM FOR CENTRAL OGLALA LAKOTA COUNTY UNTIL 445 PM
MDT...

At 406 PM MDT, Doppler radar was tracking a strong thunderstorm 7
miles west of Rockyford, or 33 miles north of Pine Ridge, moving
southeast at 25 mph.

Dime size hail and wind gusts up to 50 mph will be possible with this
storm.

Locations impacted include...
Kyle, Manderson, Rockyford and Sharps Corner.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 4347 10281 4358 10276 4361 10266 4343 10216
      4323 10247
TIME...MOT...LOC 2206Z 306DEG 24KT 4350 10266

Bunkers

Special weather statement, Aug 6, 3:47 PM MST, 48 minutes before

Special Weather Statement
National Weather Service Rapid City SD
447 PM MDT MON AUG 6 2018

SDZ042>044-062330-
Jackson SD-Bennett SD-Oglala Lakota SD-
447 PM MDT MON AUG 6 2018

...STRONG THUNDERSTORM FOR EAST-CENTRAL OGLALA LAKOTA...
SOUTHWESTERN JACKSON AND NORTHWESTERN BENNETT COUNTIES UNTIL 530 PM
MDT...

At 447 PM MDT, Doppler radar was tracking a strong thunderstorm 3
miles east of Sharps Corner, or 27 miles northeast of Pine Ridge,
moving southeast at 25 mph.

Nickel size hail and wind gusts up to 50 mph will be possible with
this storm.

Locations impacted include...
Porcupine, Kyle and Sharps Corner.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 4336 10249 4349 10247 4351 10234 4337 10187
      4312 10221
TIME...MOT...LOC 2247Z 306DEG 23KT 4339 10234

Bunkers

Special weather statement, Aug 6, 4:10 PM MST, 25 minutes before

Special Weather Statement
National Weather Service Rapid City SD
510 PM MDT MON AUG 6 2018

SDZ042-070000-
Oglala Lakota SD-
510 PM MDT MON AUG 6 2018

...STRONG THUNDERSTORM FOR SOUTHWESTERN OGLALA LAKOTA COUNTY UNTIL
600 PM MDT...

At 510 PM MDT, Doppler radar was tracking a strong thunderstorm 9
miles northwest of Oglala, or 23 miles northwest of Pine Ridge,
moving southeast at 20 mph.

Nickel size hail and wind gusts up to 50 mph will be possible with
this storm.

Locations impacted include...
Oglala and Slim Buttes.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 4326 10301 4329 10300 4338 10282 4317 10255
      4303 10282
TIME...MOT...LOC 2310Z 323DEG 19KT 4328 10287

Bunkers

Special weather statement, Aug 6, 4:18 PM MST, 17 minutes before

Special Weather Statement
National Weather Service Rapid City SD
518 PM MDT MON AUG 6 2018

SDZ012-013-073-070000-
Butte SD-Southern Meade Co Plains SD-Northern Meade Co Plains SD-
518 PM MDT MON AUG 6 2018

...STRONG THUNDERSTORM FOR SOUTHEASTERN BUTTE AND CENTRAL MEADE
COUNTIES UNTIL 600 PM MDT...

At 518 PM MDT, Doppler radar was tracking a strong thunderstorm 5
miles east of Owl Butte, or 26 miles northeast of Sturgis, moving
east at 40 mph.

Half inch hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Union Center, Fairpoint, Stoneville and Owl Butte.

LAT...LON 4457 10328 4470 10329 4478 10320 4478 10259
      4444 10266
TIME...MOT...LOC 2318Z 284DEG 33KT 4468 10314

Bunkers

Special weather statement, Aug 6, 4:22 PM MST, 13 minutes before

Special Weather Statement
National Weather Service Rapid City SD
522 PM MDT MON AUG 6 2018

SDZ044-070000-
Bennett SD-
522 PM MDT MON AUG 6 2018

...STRONG THUNDERSTORM FOR NORTHWESTERN BENNETT COUNTY UNTIL 600 PM
MDT...

At 521 PM MDT, Doppler radar was tracking a strong thunderstorm 3
miles north of Allen, or 14 miles northwest of Martin, moving east at
35 mph.

Dime size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Martin, Allen and northeastern Lacreek Wildlife Refuge.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 4331 10208 4339 10209 4339 10168 4335 10141
      4311 10157
TIME...MOT...LOC 2321Z 290DEG 30KT 4333 10191

Bunkers

The radar

The Rapid City radar (KUDX), 104 km away, was scanning. The volume nearest the first event began at 23:37 UTC.

Open the radar archive at this moment

Event by event

1 hail. Local standard time, as filed.

Hail, Oglala Lakota

When: August 6, 4:35 PM MST
Where: Oglala Lakota County, 6.08 mi W of Oglala
Measured: 1 in hail
Reported by: Public
Coordinates: 43.190, -102.870

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

Every storm in South Dakota in 2018 Every state in 2018 This day in weather history Warnings in South Dakota, August 2018

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: 772609.