Alert archive / South Dakota / Tornado Warnings in 2011
Tornado Warning 40, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this tornado warning at Aug 22, 2011, 11:11 PM CDT for Lake County, McCook County, Minnehaha County, South Dakota. It was in force for 34 min. 2 reports 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 22, 2011, 11:11 PM CDT (04:11 UTC)
- Expired
- Aug 22, 2011, 11:45 PM CDT
- In force
- 34 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Storm-based polygon
Counties Lake County, SD, McCook County, SD, Minnehaha County, SD
The radar
The Sioux Falls radar (KFSD), 46 km from the middle of the area, began a volume at 04:12 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 22, 11:24 PM CDT | HAIL 1 | 7 S Madison, SD | ALSO 40 MPH WIND GUSTS. |
| Aug 22, 11:26 PM CDT | FUNNEL CLOUD | 2 Sw Orland, SD |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Aberdeen, SD (KABR), launched 00:00Z, 4.2 hours before the alert went out and 152 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
- 2620 J/kg
- Mixed-layer CIN
- -134 J/kg
- Mixed-layer LCL
- 1327 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 86 m²/s²
- 0-3 km storm-relative helicity
- 107 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 3.8
The text
As transmitted, in the capitals the NWS used until 2016.
221 WFUS53 KFSD 230411 TORFSD SDC079-087-099-230445- /O.NEW.KFSD.TO.W.0040.110823T0411Z-110823T0445Z/ BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE SIOUX FALLS SD 1111 PM CDT MON AUG 22 2011 THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A * TORNADO WARNING FOR... SOUTHERN LAKE COUNTY IN EAST CENTRAL SOUTH DAKOTA... NORTHEASTERN MCCOOK COUNTY IN SOUTHEAST SOUTH DAKOTA... NORTHWESTERN MINNEHAHA COUNTY IN SOUTHEAST SOUTH DAKOTA... * UNTIL 1145 PM CDT * AT 1111 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS STORM WAS LOCATED NEAR ORLAND...OR 12 MILES SOUTHWEST OF MADISON...AND MOVING SOUTHEAST AT 25 MPH. * THIS TORNADIC STORM WILL AFFECT MAINLY RURAL AREAS OF NORTHEASTERN MCCOOK...NORTHWESTERN MINNEHAHA AND SOUTHERN LAKE COUNTIES... INCLUDING THE FOLLOWING LOCATIONS ORLAND. 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 4397 9690 4370 9701 4385 9737 4401 9730 TIME...MOT...LOC 0411Z 296DEG 21KT 4388 9725 $$ HANKO
2 follow-up statements
465 WWUS53 KFSD 230426 SVSFSD SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 1126 PM CDT MON AUG 22 2011 SDC079-087-099-230445- /O.CON.KFSD.TO.W.0040.000000T0000Z-110823T0445Z/ MINNEHAHA SD-MCCOOK SD-LAKE SD- 1126 PM CDT MON AUG 22 2011 ...A TORNADO WARNING REMAINS IN EFFECT FOR SOUTHEASTERN LAKE... NORTHEASTERN MCCOOK AND NORTHWESTERN MINNEHAHA COUNTIES UNTIL 1145 PM CDT... AT 1126 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS STORM WAS LOCATED NEAR ORLAND...OR 12 MILES SOUTH OF MADISON...MOVING SOUTHEAST AT 25 MPH. PRECAUTIONARY/PREPAREDNESS ACTIONS... TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT YOURSELF FROM FLYING DEBRIS. TORNADOES ARE DIFFICULT TO SEE AT NIGHT. TAKE COVER NOW. && LAT...LON 4384 9729 4398 9723 4397 9690 4370 9701 TIME...MOT...LOC 0426Z 296DEG 21KT 4383 9715 $$ HANKO
502 WWUS53 KFSD 230430 SVSFSD SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 1130 PM CDT MON AUG 22 2011 SDC079-087-099-230445- /O.CON.KFSD.TO.W.0040.000000T0000Z-110823T0445Z/ MINNEHAHA SD-MCCOOK SD-LAKE SD- 1130 PM CDT MON AUG 22 2011 ...A TORNADO WARNING REMAINS IN EFFECT FOR SOUTHEASTERN LAKE... NORTHEASTERN MCCOOK AND NORTHWESTERN MINNEHAHA COUNTIES UNTIL 1145 PM CDT... AT 1129 PM CDT...TRAINED WEATHER SPOTTERS REPORTED A FUNNEL CLOUD. THIS TORNADO WAS LOCATED 2 MILES SOUTH OF ORLAND...OR 12 MILES SOUTH OF MADISON...MOVING SOUTHEAST AT 25 MPH. 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. TORNADOES ARE DIFFICULT TO SEE AT NIGHT. TAKE COVER NOW. && LAT...LON 4384 9729 4398 9723 4397 9690 4370 9701 TIME...MOT...LOC 0429Z 296DEG 21KT 4382 9713 $$ HANKO
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 22, 9:43 PM CDT | Severe Thunderstorm Warning | FSD | Lake, McCook, Miner | 47 min |
| Aug 22, 10:17 PM CDT | Severe Thunderstorm Warning | FSD | Lake, McCook, Minnehaha, Moody | 43 min |
| Aug 22, 10:27 PM CDT | Severe Thunderstorm Warning | FSD | Lake, Miner | 33 min |
| Aug 22, 10:56 PM CDT | Severe Thunderstorm Warning | FSD | Lake, Miner | 49 min |
| Aug 22, 11:23 PM CDT | Severe Thunderstorm Warning | FSD | Minnehaha, Moody | 52 min |
| Aug 22, 11:41 PM CDT | Tornado Warning | FSD | Lake, Minnehaha, Moody | 34 min |
| Aug 23, 12:12 AM CDT | Severe Thunderstorm Warning | FSD | Minnehaha | 48 min |
| Aug 23, 3:43 AM CDT | Heat Advisory | FSD | Bon Homme, Clay, Hutchinson, Lincoln, Turner, Union and 1 more | 11 hr |
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.