Alert archive / South Dakota / Tornado Warnings in 2011
Tornado Warning 19, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this tornado warning at May 11, 2011, 6:13 PM CDT for Lincoln County, Union County, South Dakota. It was in force for 32 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
- May 11, 2011, 6:13 PM CDT (23:13 UTC)
- Expired
- May 11, 2011, 6:45 PM CDT
- In force
- 32 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Storm-based polygon
Counties Lincoln County, SD, Union County, SD
The radar
The Sioux Falls radar (KFSD), 58 km from the middle of the area, began a volume at 23:15 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.
The nearest sounding before it
Omaha, NE (KOAX), launched 12:00Z, 11.2 hours before the alert went out and 197 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
- 909 J/kg
- Mixed-layer CIN
- -95 J/kg
- Mixed-layer LCL
- 1123 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 55 m²/s²
- 0-3 km storm-relative helicity
- 177 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.2
The text
As transmitted, in the capitals the NWS used until 2016.
915
WFUS53 KFSD 112313
TORFSD
SDC083-127-112345-
/O.NEW.KFSD.TO.W.0019.110511T2313Z-110511T2345Z/
BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
613 PM CDT WED MAY 11 2011
THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A
* TORNADO WARNING FOR...
SOUTHEASTERN LINCOLN COUNTY IN SOUTHEAST SOUTH DAKOTA...
NORTHEASTERN UNION COUNTY IN SOUTHEAST SOUTH DAKOTA...
* UNTIL 645 PM CDT
* AT 613 PM CDT...TRAINED WEATHER SPOTTERS REPORTED A TORNADO 3
MILES NORTH OF HAWARDEN. DOPPLER RADAR SHOWED THIS TORNADO MOVING
NORTHWEST AT 15 MPH.
* THE TORNADO WILL AFFECT MAINLY RURAL AREAS OF NORTHEASTERN UNION
AND SOUTHEASTERN LINCOLN COUNTIES.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TO REPEAT...A TORNADO IS ON THE GROUND. 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 4303 9655 4314 9676 4324 9662 4307 9648
4306 9650 4306 9652 4304 9653
TIME...MOT...LOC 2313Z 132DEG 12KT 4308 9654
$$
LAFLIN2 follow-up statements
593 WWUS53 KFSD 112328 SVSFSD SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 628 PM CDT WED MAY 11 2011 SDC127-112337- /O.CAN.KFSD.TO.W.0019.000000T0000Z-110511T2345Z/ UNION SD- 628 PM CDT WED MAY 11 2011 ...THE TORNADO WARNING FOR NORTHEASTERN UNION COUNTY IS CANCELLED... THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED AREA. LAT...LON 4308 9661 4314 9676 4324 9662 4310 9655 TIME...MOT...LOC 2327Z 132DEG 12KT 4311 9659 $$ SDC083-112345- /O.CON.KFSD.TO.W.0019.000000T0000Z-110511T2345Z/ LINCOLN SD- 628 PM CDT WED MAY 11 2011 ...A TORNADO WARNING REMAINS IN EFFECT FOR SOUTH CENTRAL LINCOLN COUNTY UNTIL 645 PM CDT... AT 627 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS STORM WAS LOCATED 6 MILES NORTHEAST OF ALCESTER...OR 9 MILES NORTHWEST OF HAWARDEN...MOVING NORTHWEST AT 15 MPH. THIS STORM PREVIOUSLY PRODUCED A BRIEF TORNADO 3 MILES NORTH OF HAWARDEN. 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 4308 9661 4314 9676 4324 9662 4310 9655 TIME...MOT...LOC 2327Z 132DEG 12KT 4311 9659 $$ LAFLIN
547 WWUS53 KFSD 112340 SVSFSD SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 640 PM CDT WED MAY 11 2011 SDC083-112350- /O.EXP.KFSD.TO.W.0019.000000T0000Z-110511T2345Z/ LINCOLN SD- 640 PM CDT WED MAY 11 2011 ...THE TORNADO WARNING FOR SOUTH CENTRAL LINCOLN COUNTY WILL EXPIRE AT 645 PM CDT... THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY...HOWEVER HAIL IS STILL POSSIBLE WITH THIS THUNDERSTORM. LAT...LON 4308 9661 4314 9676 4324 9662 4310 9655 TIME...MOT...LOC 2340Z 132DEG 12KT 4314 9663 $$ LAFLIN
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 11, 4:51 PM CDT | Severe Thunderstorm Warning | FSD | Union | 39 min |
| May 11, 4:55 PM CDT | Severe Thunderstorm Warning | FSD | Union | 50 min |
| May 11, 5:37 PM CDT | Severe Thunderstorm Warning | FSD | Clay, Union, Yankton | 38 min |
| May 11, 5:42 PM CDT | Severe Thunderstorm Warning | FSD | Union | 48 min |
| May 11, 5:48 PM CDT | Severe Thunderstorm Warning | FSD | Lincoln | 42 min |
| May 11, 6:06 PM CDT | Severe Thunderstorm Warning | FSD | Lincoln | 24 min |
| May 11, 6:29 PM CDT | Severe Thunderstorm Warning | FSD | Lincoln, Turner, Union | 31 min |
| May 11, 6:49 PM CDT | Severe Thunderstorm Warning | FSD | Lincoln, Minnehaha, Turner | 41 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.