Alert archive / South Dakota / Tornado Warnings in 2011
Tornado Warning 41, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this tornado warning at Aug 22, 2011, 11:41 PM CDT for Lake County, Minnehaha County, Moody County, South Dakota. It was in force for 34 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 22, 2011, 11:41 PM CDT (04:41 UTC)
- Expired
- Aug 23, 2011, 12:15 AM CDT
- In force
- 34 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Storm-based polygon
Counties Lake County, SD, Minnehaha County, SD, Moody County, SD
The radar
The Sioux Falls radar (KFSD), 31 km from the middle of the area, began a volume at 04:44 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, 11:55 PM CDT | HAIL 0.5 | Chester, 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, 4.7 hours before the alert went out and 169 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.
250 WFUS53 KFSD 230441 TORFSD SDC079-099-101-230515- /O.NEW.KFSD.TO.W.0041.110823T0441Z-110823T0515Z/ BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE SIOUX FALLS SD 1141 PM CDT MON AUG 22 2011 THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A * TORNADO WARNING FOR... SOUTHEASTERN LAKE COUNTY IN EAST CENTRAL SOUTH DAKOTA... NORTHWESTERN MINNEHAHA COUNTY IN SOUTHEAST SOUTH DAKOTA... SOUTHWESTERN MOODY COUNTY IN EAST CENTRAL SOUTH DAKOTA... * UNTIL 1215 AM CDT * AT 1141 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS STORM WAS LOCATED 6 MILES WEST OF COLTON...OR 15 MILES SOUTH OF MADISON...AND MOVING SOUTHEAST AT 25 MPH. * THIS TORNADIC STORM WILL BE NEAR... COLTON AROUND 1155 PM CDT... 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 AND CONFIRM AT NIGHT. TAKE COVER NOW. && LAT...LON 4391 9668 4365 9683 4380 9713 4397 9704 TIME...MOT...LOC 0441Z 296DEG 21KT 4379 9704 $$ HANKO
1 follow-up statement
441
WWUS53 KFSD 230459
SVSFSD
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1159 PM CDT MON AUG 22 2011
SDC079-230509-
/O.CAN.KFSD.TO.W.0041.000000T0000Z-110823T0515Z/
LAKE SD-
1159 PM CDT MON AUG 22 2011
...THE TORNADO WARNING FOR SOUTHEASTERN LAKE COUNTY IS CANCELLED...
THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA.
LAT...LON 4394 9688 4391 9668 4365 9683 4375 9698
4385 9693 4385 9689 4393 9689
TIME...MOT...LOC 0459Z 296DEG 21KT 4374 9691
$$
SDC099-101-230515-
/O.CON.KFSD.TO.W.0041.000000T0000Z-110823T0515Z/
MOODY SD-MINNEHAHA SD-
1159 PM CDT MON AUG 22 2011
...A TORNADO WARNING REMAINS IN EFFECT FOR NORTH CENTRAL MINNEHAHA
AND SOUTHWESTERN MOODY COUNTIES UNTIL 1215 AM CDT...
AT 1159 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE
TRACKING A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS
DANGEROUS STORM WAS LOCATED NEAR COLTON...OR 17 MILES NORTHWEST OF
SIOUX FALLS...MOVING SOUTHEAST AT 25 MPH.
THIS TORNADO WILL AFFECT MAINLY RURAL AREAS OF NORTH CENTRAL
MINNEHAHA AND SOUTHWESTERN MOODY COUNTIES.
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 4394 9688 4391 9668 4365 9683 4375 9698
4385 9693 4385 9689 4393 9689
TIME...MOT...LOC 0459Z 296DEG 21KT 4374 9691
$$
HANKOThe 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, 11:11 PM CDT | Tornado Warning | FSD | Lake, McCook, Minnehaha | 34 min |
| Aug 22, 11:23 PM CDT | Severe Thunderstorm Warning | FSD | Minnehaha, Moody | 52 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.