Alert archive / South Dakota / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 77, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at May 21, 2011, 7:28 PM CDT for Clay County, Lincoln County, Turner 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 21, 2011, 7:28 PM CDT (00:28 UTC)
- Expired
- May 21, 2011, 8:00 PM CDT
- In force
- 32 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 58.0 mph
Counties Clay County, SD, Lincoln County, SD, Turner County, SD
The radar
The Sioux Falls radar (KFSD), 64 km from the middle of the area, began a volume at 00:28 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 00:00Z, 0.5 hours before the alert went out and 196 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
- 1436 J/kg
- Mixed-layer CIN
- -10 J/kg
- Mixed-layer LCL
- 1205 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 99 m²/s²
- 0-3 km storm-relative helicity
- 145 m²/s²
- Significant tornado parameter
- 0.6
- Supercell composite
- 5.0
The text
As transmitted, in the capitals the NWS used until 2016.
981
WUUS53 KFSD 220028
SVRFSD
SDC027-083-125-220100-
/O.NEW.KFSD.SV.W.0077.110522T0028Z-110522T0100Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
728 PM CDT SAT MAY 21 2011
THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
NORTHERN CLAY COUNTY IN SOUTHEAST SOUTH DAKOTA...
SOUTHWESTERN LINCOLN COUNTY IN SOUTHEAST SOUTH DAKOTA...
SOUTHEASTERN TURNER COUNTY IN SOUTHEAST SOUTH DAKOTA...
* UNTIL 800 PM CDT
* AT 729 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE
TRACKING A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL. THIS STORM WAS LOCATED 5 MILES NORTH OF MECKLING...OR 12
MILES NORTHWEST OF VERMILLION...AND MOVING NORTHEAST AT 45 MPH.
* THE SEVERE THUNDERSTORM WILL BE NEAR...
CENTERVILLE AND VIBORG AROUND 745 PM CDT...
DAVIS AROUND 755 PM CDT...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR
YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE
INTO AREAS WHERE WATER COVERS THE ROAD.
&&
LAT...LON 4288 9717 4299 9717 4334 9702 4320 9661
4308 9674 4308 9680 4302 9680 4283 9700
TIME...MOT...LOC 0029Z 208DEG 39KT 4296 9704
WIND...HAIL <58MPH 1.00IN
$$
HANKO2 follow-up statements
241
WWUS53 KFSD 220036
SVSFSD
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
736 PM CDT SAT MAY 21 2011
SDC027-083-125-220100-
/O.CON.KFSD.SV.W.0077.000000T0000Z-110522T0100Z/
LINCOLN SD-CLAY SD-TURNER SD-
736 PM CDT SAT MAY 21 2011
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHEASTERN
TURNER...NORTHERN CLAY AND SOUTHWESTERN LINCOLN COUNTIES UNTIL 800 PM
CDT...
AT 736 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING
A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL. THIS
STORM WAS LOCATED 6 MILES SOUTHEAST OF WAKONDA...OR 13 MILES
SOUTHWEST OF BERESFORD...MOVING NORTHEAST AT 40 MPH.
THE SEVERE THUNDERSTORM WILL BE NEAR...
CENTERVILLE AND VIBORG AROUND 745 PM CDT...
DAVIS AROUND 755 PM CDT...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR
YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE
INTO AREAS WHERE WATER COVERS THE ROAD.
&&
LAT...LON 4295 9712 4303 9713 4334 9702 4320 9661
4308 9674 4308 9680 4302 9681 4290 9696
TIME...MOT...LOC 0036Z 213DEG 36KT 4300 9698
WIND...HAIL <58MPH 1.00IN
$$
HANKO209
WWUS53 KFSD 220053
SVSFSD
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
753 PM CDT SAT MAY 21 2011
SDC027-083-125-220103-
/O.EXP.KFSD.SV.W.0077.000000T0000Z-110522T0100Z/
LINCOLN SD-CLAY SD-TURNER SD-
753 PM CDT SAT MAY 21 2011
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN TURNER...NORTHERN
CLAY AND SOUTHWESTERN LINCOLN COUNTIES WILL EXPIRE AT 800 PM CDT...
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED AND MOVED OUT OF
THE WARNED AREA.
TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
IN SIOUX FALLS.
LAT...LON 4295 9712 4303 9713 4334 9702 4320 9661
4308 9674 4308 9680 4302 9681 4290 9696
TIME...MOT...LOC 0053Z 213DEG 36KT 4314 9685
$$
HANKOThe office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 21, 7:05 PM CDT | Severe Thunderstorm Warning | FSD | Clay, Turner | 25 min |
| May 21, 7:38 PM CDT | Severe Thunderstorm Warning | FSD | Clay, Union | 37 min |
| May 21, 7:49 PM CDT | Severe Thunderstorm Warning | FSD | Lincoln, Union | 26 min |
| May 21, 8:16 PM CDT | Severe Thunderstorm Warning | FSD | Lincoln, Minnehaha | 29 min |
| May 21, 8:39 PM CDT | Severe Thunderstorm Warning | FSD | Minnehaha, Moody | 36 min |
| May 22, 10:52 AM CDT | River Flood Warning | FSD | Minnehaha, Moody | 22 hr |
Nearby
Severe Thunderstorm Warnings in South Dakota, 2011Every severe thunderstorm warning 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.