Alert archive / South Dakota / Tornado Warnings in 2011
Tornado Warning 21, NWS Rapid City, SD
NWS Rapid City, SD issued this tornado warning at Aug 7, 2011, 3:56 PM MDT for Custer County, South Dakota. It was in force for 29 min. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Aug 7, 2011, 3:56 PM MDT (21:56 UTC)
- Expired
- Aug 7, 2011, 4:25 PM MDT
- In force
- 29 min
- Issued by
- NWS Rapid City, SD
- Area
- Storm-based polygon
County Custer County, SD
The radar
The Rapid City radar (KUDX), 54 km from the middle of the area, began a volume at 21:58 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 7, 4:30 PM MDT | HAIL 1.75 | 4 S Red Shirt, SD |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Aug 7, 1:58 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
The nearest sounding before it
Rapid City, SD (KUNR), launched 12:00Z, 9.9 hours before the alert went out and 47 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.
- Mixed-layer CAPE
- 561 J/kg
- Mixed-layer CIN
- -335 J/kg
- Mixed-layer LCL
- 1423 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 63 m²/s²
- 0-3 km storm-relative helicity
- 136 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
557 WFUS53 KUNR 072156 TORUNR SDC033-113-072245- /O.NEW.KUNR.TO.W.0021.110807T2156Z-110807T2245Z/ BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE RAPID CITY SD 356 PM MDT SUN AUG 7 2011 THE NATIONAL WEATHER SERVICE IN RAPID CITY HAS ISSUED A * TORNADO WARNING FOR... EAST CENTRAL CUSTER COUNTY IN SOUTHWESTERN SOUTH DAKOTA... NORTHWESTERN SHANNON COUNTY IN SOUTHWESTERN SOUTH DAKOTA... * UNTIL 445 PM MDT * AT 353 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS STORM WAS LOCATED 7 MILES EAST OF FAIRBURN...OR 27 MILES EAST OF DOWNTOWN CUSTER...AND MOVING SOUTHEAST AT 20 MPH. * LOCATIONS IMPACTED INCLUDE... RED SHIRT. PRECAUTIONARY/PREPAREDNESS ACTIONS... TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT YOURSELF FROM FLYING DEBRIS. && LAT...LON 4363 10281 4353 10294 4370 10314 4375 10307 TIME...MOT...LOC 2156Z 309DEG 16KT 4368 10305 $$ TRIMARCHI
2 follow-up statements
743
WWUS53 KUNR 072216
SVSUNR
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE RAPID CITY SD
416 PM MDT SUN AUG 7 2011
SDC033-072223-
/O.CAN.KUNR.TO.W.0021.000000T0000Z-110807T2245Z/
CUSTER SD-
416 PM MDT SUN AUG 7 2011
...THE TORNADO WARNING FOR EAST CENTRAL CUSTER COUNTY IS CANCELLED...
THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA.
LAT...LON 4361 10299 4361 10294 4365 10293 4366 10291
4363 10281 4356 10290 4356 10292
TIME...MOT...LOC 2213Z 307DEG 18KT 4363 10295
$$
SDC113-072245-
/O.CON.KUNR.TO.W.0021.000000T0000Z-110807T2245Z/
SHANNON SD-
416 PM MDT SUN AUG 7 2011
...A TORNADO WARNING REMAINS IN EFFECT FOR NORTHWESTERN SHANNON
COUNTY UNTIL 445 PM MDT...
AT 411 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
STORM WAS LOCATED NEAR RED SHIRT...OR 29 MILES NORTHEAST OF DOWNTOWN
HOT SPRINGS...MOVING SOUTHEAST AT 20 MPH.
LOCATIONS IMPACTED INCLUDE...
RED SHIRT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.
&&
LAT...LON 4361 10299 4361 10294 4365 10293 4366 10291
4363 10281 4356 10290 4356 10292
TIME...MOT...LOC 2213Z 307DEG 18KT 4363 10295
$$
TRIMARCHI027
WWUS53 KUNR 072225
SVSUNR
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE RAPID CITY SD
425 PM MDT SUN AUG 7 2011
SDC113-072236-
/O.CAN.KUNR.TO.W.0021.000000T0000Z-110807T2245Z/
SHANNON SD-
425 PM MDT SUN AUG 7 2011
...THE TORNADO WARNING FOR NORTHWESTERN SHANNON COUNTY IS
CANCELLED...
THE TORNADO THREAT HAS DIMINISHED...THEREFORE THE TORNADO WARNING HAS
BEEN CANCELLED. HOWEVER...A SEVERE THUNDERSTORM WARNING REMAINS IN
EFFECT FOR THE AREA.
LAT...LON 4361 10299 4361 10294 4365 10293 4366 10291
4363 10281 4356 10290 4356 10292
TIME...MOT...LOC 2226Z 307DEG 18KT 4359 10288
$$
TRIMARCHIThe office that day
Everything else NWS Rapid City, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 7, 1:05 PM MDT | Severe Thunderstorm Warning | UNR | Pennington | 55 min |
| Aug 7, 1:50 PM MDT | Severe Thunderstorm Warning | UNR | Pennington | 55 min |
| Aug 7, 2:27 PM MDT | Severe Thunderstorm Warning | UNR | Pennington | 63 min |
| Aug 7, 2:36 PM MDT | Areal Flood Advisory | UNR | Pennington | 78 min |
| Aug 7, 2:53 PM MDT | Severe Thunderstorm Warning | UNR | Custer | 82 min |
| Aug 7, 2:57 PM MDT | Areal Flood Advisory | UNR | Custer | 2 hr |
| Aug 7, 3:39 PM MDT | Severe Thunderstorm Warning | UNR | Haakon | 66 min |
| Aug 7, 4:05 PM MDT | Severe Thunderstorm Warning | UNR | Custer, Pennington | 55 min |
| Aug 7, 4:19 PM MDT | Severe Thunderstorm Warning | UNR | Butte, Lawrence, Meade | 43 min |
| Aug 7, 4:28 PM MDT | Severe Thunderstorm Warning | UNR | 62 min | |
| Aug 7, 4:31 PM MDT | Severe Thunderstorm Warning | UNR | Butte, Harding | 59 min |
| Aug 7, 4:33 PM MDT | Severe Thunderstorm Warning | UNR | Haakon | 57 min |
| Aug 7, 4:47 PM MDT | Severe Thunderstorm Warning | UNR | Jackson | 58 min |
| Aug 7, 4:48 PM MDT | Severe Thunderstorm Warning | UNR | Lawrence, Meade | 31 min |
| Aug 7, 5:05 PM MDT | Severe Thunderstorm Warning | UNR | Bennett, Jackson | 55 min |
| Aug 7, 5:20 PM MDT | Severe Thunderstorm Warning | UNR | Jackson, Mellette | 55 min |
| Aug 7, 5:29 PM MDT | Severe Thunderstorm Warning | UNR | Butte, Harding, Perkins | 61 min |
| Aug 7, 5:37 PM MDT | Severe Thunderstorm Warning | UNR | Todd | 53 min |
| Aug 7, 5:49 PM MDT | Severe Thunderstorm Warning | UNR | Bennett, Jackson, Mellette, Todd | 56 min |
| Aug 7, 5:58 PM MDT | Severe Thunderstorm Warning | UNR | Butte, Meade, Perkins | 62 min |
Nearby
Tornado Warnings in South Dakota, 2011Every tornado warning in 2011Tornadoes in 2011
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.