Alert archive / South Dakota / Severe Thunderstorm Warnings in 2026

Severe Thunderstorm Warning 310, NWS Rapid City, SD

August 19, 2026Todd County, Tripp County, South Dakota

NWS Rapid City, SD issued this severe thunderstorm warning at Aug 19, 2026, 2:14 AM CDT for Todd County, Tripp County, South Dakota. It was in force for 61 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Aug 19, 2026, 2:14 AM CDT (07:14 UTC)
Expired
Aug 19, 2026, 3:15 AM CDT
In force
61 min
Issued by
NWS Rapid City, SD
Area
Storm-based polygon
Hail
1.25 in
Wind
60.0 mph

Counties Todd County, SD, Tripp County, SD

The radar

The North Platte radar (KLNX), 150 km from the middle of the area, began a volume at 07:15 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 7.2 hours before the alert went out and 228 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Aberdeen, SD at 00:00Z on 2026-08-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 487 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Aberdeen, SD at 00:00Z on 2026-08-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 79 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
487 J/kg
Mixed-layer CIN
-50 J/kg
Mixed-layer LCL
1323 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
79 m²/s²
0-3 km storm-relative helicity
203 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.0

Open this sounding in Storm Lab

The text

As transmitted.

674 
WUUS53 KUNR 190714
SVRUNR
SDC121-123-190815-
/O.NEW.KUNR.SV.W.0310.260819T0714Z-260819T0815Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Rapid City SD
214 AM CDT Wed Aug 19 2026

The National Weather Service in Rapid City has issued a

* Severe Thunderstorm Warning for...
  East Central Todd County in south central South Dakota...
  Southern Tripp County in south central South Dakota...

* Until 315 AM CDT.

* At 214 AM CDT, a severe thunderstorm was located 6 miles south of
  Carter, or 19 miles west of Winner, moving east at 30 mph.

  HAZARD...60 mph wind gusts and half dollar size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage to
           roofs, siding, and trees.

* Locations impacted include...
  Winner, Colome, Carter, Millboro, Keyapaha, Clearfield, Ideal South
  Housing and Dog Ear Lake.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Seek shelter inside a well-built structure and stay away from
windows. This storm is capable of producing damaging winds and large
hail.

&&

LAT...LON 4320 10038 4339 10022 4339 10021 4340 10021
      4342 10020 4338 9960 4300 9981 4300 10002
TIME...MOT...LOC 0714Z 290DEG 25KT 4330 10023

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.25 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

JC
3 follow-up statements
485 
WWUS53 KUNR 190734
SVSUNR

Severe Weather Statement
National Weather Service Rapid City SD
234 AM CDT Wed Aug 19 2026

SDC121-190744-
/O.CAN.KUNR.SV.W.0310.000000T0000Z-260819T0815Z/
Todd SD-
234 AM CDT Wed Aug 19 2026

...SEVERE THUNDERSTORM WARNING IS CANCELLED FOR EAST CENTRAL TODD
COUNTY...

The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled.

&&

LAT...LON 4334 9987 4332 9963 4300 9981 4300 10002
      4310 10020 4336 10005
TIME...MOT...LOC 0714Z 290DEG 25KT 4329 10022

$$


SDC123-190815-
/O.CON.KUNR.SV.W.0310.000000T0000Z-260819T0815Z/
Tripp SD-
234 AM CDT Wed Aug 19 2026

...SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 315 AM CDT FOR
SOUTHERN TRIPP COUNTY...

At 234 AM CDT, a severe thunderstorm was located over Clearfield, or
17 miles southwest of Winner, moving southeast at 30 mph.

HAZARD...60 mph wind gusts and half dollar size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to
         roofs, siding, and trees.

Locations impacted include...
  Colome, Millboro, Keyapaha, Clearfield and Dog Ear Lake.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Seek shelter inside a well-built structure and stay away from
windows. This storm is capable of producing damaging winds and large
hail.

&&

LAT...LON 4334 9987 4332 9963 4300 9981 4300 10002
      4310 10020 4336 10005
TIME...MOT...LOC 0714Z 297DEG 25KT 4324 10023

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.25 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

JC
586 
WWUS53 KUNR 190745
SVSUNR

Severe Weather Statement
National Weather Service Rapid City SD
245 AM CDT Wed Aug 19 2026

SDC123-190815-
/O.CON.KUNR.SV.W.0310.000000T0000Z-260819T0815Z/
Tripp SD-
245 AM CDT Wed Aug 19 2026

...SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 315 AM CDT FOR
SOUTHERN TRIPP COUNTY...

At 245 AM CDT, a severe thunderstorm was located near Millboro, or 17
miles south of Winner, moving southeast at 30 mph.

HAZARD...60 mph wind gusts and half dollar size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to
         roofs, siding, and trees.

Locations impacted include...
  Millboro, Keyapaha, Clearfield and Dog Ear Lake.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Seek shelter inside a well-built structure and stay away from
windows. This storm is capable of producing damaging winds and large
hail.

&&

LAT...LON 4329 9999 4324 9967 4300 9981 4300 10002
      4309 10017
TIME...MOT...LOC 0734Z 298DEG 25KT 4317 10006

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.25 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

JC
329 
WWUS53 KUNR 190814
SVSUNR

Severe Weather Statement
National Weather Service Rapid City SD
314 AM CDT Wed Aug 19 2026

SDC123-190824-
/O.EXP.KUNR.SV.W.0310.000000T0000Z-260819T0815Z/
Tripp SD-
314 AM CDT Wed Aug 19 2026

...SEVERE THUNDERSTORM WARNING WILL EXPIRE AT 315 AM CDT FOR SOUTHERN
TRIPP COUNTY...

The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

&&

LAT...LON 4329 9999 4324 9967 4300 9981 4300 10002
      4309 10017
TIME...MOT...LOC 0745Z 298DEG 25KT 4313 9997

$$

JC

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, 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 this severe thunderstorm warning went out at Aug 18, 11:49 PM CDT, 2 hours 25 minutes earlier. Its key messages:

  • Showers and storms continue into the overnight hours.
  • More chances for afternoon storms on Wednesday, mainly across western SD.
  • Trending warmer to end the week into next weekend.
Area forecast discussion, Aug 18, 11:49 PM CDT, 2 hours 25 minutes before
Area Forecast Discussion For Western SD and Northeastern WY
National Weather Service Rapid City SD
1049 PM MDT Tue Aug 18 2026

.KEY MESSAGES...

- Showers and storms continue into the overnight hours.

- More chances for afternoon storms on Wednesday, mainly across
  western SD.

- Trending warmer to end the week into next weekend.

&&

.UPDATE...
Issued at 1016 PM MDT Tue Aug 18 2026

Current radar has widespread showers/storms over the forecast area
this evening, with some wind gusts near 50 mph around storms.
Precipitation will continue overnight, moving out from west to
east early Wednesday morning.

Forecast remains mostly on track. Have removed PoP mention during
the day Wednesday. Models are all pointing to us being dry, and
CAMs show nothing during the afternoon/evening. It's not
impossible, but more likely most places will remain dry once the
overnight showers/storms move out. Things then look mostly dry the
remainder of the week as ridge dominates the northern plains. Next
significant disturbance looks to move through the area Sunday.

&&

.DISCUSSION...(This Evening Through Tuesday)
Issued at 1242 PM MDT Tue Aug 18 2026

Shortwave will push through region today and bring another round of
storms to the CWA this afternoon. Modestly unstable airmass of 1500-
2000 J/kg MUCAPE will develop over western SD by this afternoon and
evening. The instability combined with 40-50kt bulk shear will
support organized convection and potential severe weather. Main
hazards will be strong wind gusts (some gusts could exceed 70 mph)
and large hail. There is still uncertainty as to the timing and
coverage of convection this afternoon, though right now it looks
like the most likely area for severe storms stretches from
northeastern WY into portions of western and south central SD.

Wednesday is looking drier as rising heights courtesy of the
building ridge to our west will limit convection. We could still see
some isolated storms towards the eastern third of our CWA where 1000-
1500 J/kg MUCAPE will develop by the afternoon.

The upper level pattern shifts after Wednesday as aforementioned
ridge continues to build over the western US and overspreads the
region. Our CWA will sit on the northeastern periphery of the ridge,
meaning we'll see warmer temps and continued chances for storms
through the end of the week.

&&

.AVIATION...(For the 06Z TAFS Through 06Z Wednesday Night)
Issued At 1044 PM MDT Tue Aug 18 2026

Convection is continuing to move east out of our area with some
light showers lingering, primarily near the southern Black Hills.
These are expected to move out before sunrise. Afterwards, VFR
conditions are expected throughout the forecast period.

&&

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

UPDATE...Dye
DISCUSSION...Wong
AVIATION...Schweigert

In the hours before

Local storm report, Aug 18, 11:52 PM CDT, 2 hours 22 minutes before
Preliminary Local Storm Report
National Weather Service Rapid City SD
1052 PM MDT Tue Aug 18 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1040 PM     Tstm Wnd Gst     1 NE Midland            44.08N 101.14W
08/18/2026  M51 mph          Haakon             SD   Dept of Highways

&&

DYE
Special weather statement, Aug 19, 12:05 AM CDT, 2 hours 9 minutes before
Special Weather Statement
National Weather Service Rapid City SD
1205 AM CDT Wed Aug 19 2026

SDZ046-190530-
Mellette SD-
1205 AM CDT Wed Aug 19 2026

...A STRONG THUNDERSTORM WILL IMPACT SOUTHWESTERN MELLETTE COUNTY
UNTIL 1230 AM CDT...

At 1205 AM CDT, Doppler radar was tracking a strong thunderstorm over
Corn Creek, or 22 miles west of White River, moving east at 30 mph.

HAZARD...Wind gusts up to 50 mph and half inch size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
  Norris, Cedar Butte, Corn Creek and Black Pipe.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the weather situation closely and be alert for threatening
weather conditions.

&&

LAT...LON 4372 10123 4369 10092 4345 10096 4346 10123
TIME...MOT...LOC 0505Z 279DEG 27KT 4360 10119

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...50 MPH

JC
Special weather statement, Aug 19, 12:25 AM CDT, 1 hour 49 minutes before
Special Weather Statement
National Weather Service Rapid City SD
1225 AM CDT Wed Aug 19 2026

SDZ046-190600-
Mellette SD-
1225 AM CDT Wed Aug 19 2026

...A STRONG THUNDERSTORM WILL IMPACT SOUTH CENTRAL MELLETTE COUNTY
UNTIL 1 AM CDT...

At 1225 AM CDT, Doppler radar was tracking a strong thunderstorm near
Cedar Butte, or 11 miles west of White River, moving east at 35 mph.

HAZARD...Wind gusts up to 50 mph and half inch size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
  White River, Swift Bear and Horse Creek.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the weather situation closely and be alert for threatening
weather conditions.

&&

LAT...LON 4347 10097 4369 10093 4366 10057 4340 10062
TIME...MOT...LOC 0524Z 279DEG 28KT 4357 10096

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...50 MPH

JC
Local storm report, Aug 19, 12:56 AM CDT, 1 hour 18 minutes before
Preliminary Local Storm Report
National Weather Service Rapid City SD
1156 PM MDT Tue Aug 18 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1125 PM     Tstm Wnd Gst     4 WNW Cedar Butte       43.60N 101.10W
08/18/2026  M50 mph          Mellette           SD   Mesonet

&&

JC
Special weather statement, Aug 19, 12:58 AM CDT, 1 hour 16 minutes before
Special Weather Statement
National Weather Service Rapid City SD
1258 AM CDT Wed Aug 19 2026

SDZ046-049-190645-
Tripp SD-Mellette SD-
1258 AM CDT Wed Aug 19 2026

...A STRONG THUNDERSTORM WILL IMPACT EASTERN MELLETTE AND WEST
CENTRAL TRIPP COUNTIES UNTIL 145 AM CDT...

At 1258 AM CDT, Doppler radar was tracking a strong thunderstorm near
White River, moving east at 30 mph.

HAZARD...Wind gusts up to 50 mph and half inch size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
  Wood, Mosher, Butte Creek and Intersection of Highway 83 and White
  River.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the weather situation closely and be alert for threatening
weather conditions.

&&

LAT...LON 4339 10072 4373 10070 4371 10068 4375 10066
      4374 10062 4377 10059 4376 10055 4374 10055
      4373 10047 4372 10047 4373 10044 4372 10042
      4374 10042 4374 10037 4372 10034 4372 10030
      4370 10029 4371 10023 4368 10021 4338 10021
TIME...MOT...LOC 0558Z 274DEG 26KT 4360 10066

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...50 MPH

JC
Special weather statement, Aug 19, 1:49 AM CDT, 25 minutes before
Special Weather Statement
National Weather Service Rapid City SD
149 AM CDT Wed Aug 19 2026

SDZ046-047-049-190730-
Tripp SD-Mellette SD-Todd SD-
149 AM CDT Wed Aug 19 2026

...A LINE OF STRONG THUNDERSTORMS WILL IMPACT SOUTHEASTERN
MELLETTE...NORTHWESTERN TRIPP AND NORTHEASTERN TODD COUNTIES UNTIL
230 AM CDT...

At 149 AM CDT, Doppler radar was tracking a line of strong
thunderstorms extending from 15 miles north of Ideal to near Haystack
Butte, or extending from 27 miles north of Winner to 9 miles east of
Mission, moving east at 20 mph.

HAZARD...Wind gusts up to 50 mph and half inch size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
  Okreek, Ideal, Carter, Mosher, Witten, Hidden Timber, Haystack
  Butte and northeastern Rosebud Reservation.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the weather situation closely and be alert for threatening
weather conditions.

&&

LAT...LON 4356 10027 4371 10018 4369 10011 4371 10001
      4369 9998 4370 9990 4367 9987 4369 9987
      4369 9985 4370 9986 4369 9984 4370 9980
      4372 9976 4375 9974 4343 9991 4316 10030
      4330 10057
TIME...MOT...LOC 0648Z 289DEG 19KT 4375 10001 4350 10014 4328 10048

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...50 MPH

JC

The office that day

Everything else NWS Rapid City, SD issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 18, 8:03 PM CDTSevere Thunderstorm WarningUNRLawrence, Meade32 min
Aug 18, 8:18 PM CDTSpecial Weather StatementUNRButte27 min
Aug 18, 8:34 PM CDTSevere Thunderstorm WarningUNRLawrence, Meade, Pennington32 min
Aug 18, 8:45 PM CDTSpecial Weather StatementUNRMeade30 min
Aug 18, 9:05 PM CDTSevere Thunderstorm WarningUNRCuster, Pennington32 min
Aug 18, 9:11 PM CDTSpecial Weather StatementUNRMeade34 min
Aug 18, 9:23 PM CDTSevere Thunderstorm Warning Considerable damage threatUNRMeade, Perkins52 min
Aug 18, 11:06 PM CDTSpecial Weather StatementUNRJackson24 min
Aug 18, 11:44 PM CDTSpecial Weather StatementUNRJackson31 min
Aug 19, 12:05 AM CDTSpecial Weather StatementUNRMellette25 min
Aug 19, 12:25 AM CDTSpecial Weather StatementUNRMellette35 min
Aug 19, 12:58 AM CDTSpecial Weather StatementUNRMellette47 min
Aug 19, 1:49 AM CDTSpecial Weather StatementUNRTripp41 min
Aug 19, 6:49 AM CDTSpecial Weather StatementUNRTripp26 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 2026Every severe thunderstorm warning in 2026

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.