Alert archive / South Dakota / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 80, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at May 21, 2011, 8:16 PM CDT for Lyon County, Iowa; Lincoln County, Minnehaha County, South Dakota; Rock County, Minnesota. It was in force for 29 min. 3 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
- May 21, 2011, 8:16 PM CDT (01:16 UTC)
- Expired
- May 21, 2011, 8:45 PM CDT
- In force
- 29 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Lyon County, IA, Rock County, MN, Lincoln County, SD, Minnehaha County, SD
The radar
The Sioux Falls radar (KFSD), 8 km from the middle of the area, began a volume at 01:19 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 |
|---|---|---|---|
| May 21, 8:17 PM CDT | TSTM WND DMG | 2 Se Sioux Falls, SD | TREE PUSHED DOWN ACROSS ROADWAY BY STRONG WIND GUSTS |
| May 21, 8:19 PM CDT | TSTM WND DMG | 2 Se Sioux Falls, SD | ROOF REPORTED RIPPED OFF IN TOWN |
| May 21, 8:35 PM CDT | HAIL 0.75 | Brandon, SD | ALSO 45 MPH WIND GUSTS AND HEAVY RAIN |
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 |
|---|---|---|---|
| May 21, 2:25 PM CDT | Severe Thunderstorm Watch | SPC | 10 hr |
The nearest sounding before it
Aberdeen, SD (KABR), launched 00:00Z, 1.3 hours before the alert went out and 204 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
- 361 J/kg
- Mixed-layer CIN
- -23 J/kg
- Mixed-layer LCL
- 1036 m above ground
- 0-6 km bulk shear
- 7 kt
- 0-1 km storm-relative helicity
- -7 m²/s²
- 0-3 km storm-relative helicity
- -50 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
454 WUUS53 KFSD 220116 SVRFSD IAC119-MNC133-SDC083-099-220145- /O.NEW.KFSD.SV.W.0080.110522T0116Z-110522T0145Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE SIOUX FALLS SD 816 PM CDT SAT MAY 21 2011 THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... WESTERN LYON COUNTY IN NORTHWEST IOWA... SOUTHWESTERN ROCK COUNTY IN SOUTHWEST MINNESOTA... NORTH CENTRAL LINCOLN COUNTY IN SOUTHEAST SOUTH DAKOTA... EASTERN MINNEHAHA COUNTY IN SOUTHEAST SOUTH DAKOTA... * UNTIL 845 PM CDT * AT 815 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR CANTON...AND MOVING NORTH AT 55 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... SOUTHEASTERN SIOUX FALLS AROUND 820 PM CDT... ROWENA AND EASTERN SIOUX FALLS AROUND 825 PM CDT... BRANDON AND VALLEY SPRINGS AROUND 830 PM CDT... PALISADES STATE PARK AROUND 835 PM CDT... GARRETSON AND BALTIC AROUND 840 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 4377 9677 4375 9638 4328 9647 4330 9679 TIME...MOT...LOC 0115Z 187DEG 47KT 4341 9662 WIND...HAIL 60MPH 1.00IN $$ HANKO
2 follow-up statements
745 WWUS53 KFSD 220123 SVSFSD SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 823 PM CDT SAT MAY 21 2011 IAC119-MNC133-SDC083-099-220145- /O.CON.KFSD.SV.W.0080.000000T0000Z-110522T0145Z/ LYON IA-ROCK MN-MINNEHAHA SD-LINCOLN SD- 823 PM CDT SAT MAY 21 2011 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTH CENTRAL LINCOLN...EASTERN MINNEHAHA...SOUTHWESTERN ROCK AND WESTERN LYON COUNTIES UNTIL 845 PM CDT... AT 822 PM CDT...TRAINED WEATHER SPOTTERS REPORTED A SEVERE THUNDERSTORM PRODUCING QUARTER SIZE HAIL...AND DESTRUCTIVE WINDS IN EXCESS OF 70 MPH. THIS STORM WAS LOCATED NEAR HARRISBURG...OR 9 MILES SOUTHEAST OF SIOUX FALLS...MOVING NORTH AT 55 MPH. IN ADDITION...AT 819 PM WINDS CAPABLE OF TEARING OFF A ROOF WERE REPORTED IN EASTERN SIOUX FALLS WITH THIS STORM. THE SEVERE THUNDERSTORM WILL BE NEAR... EASTERN SIOUX FALLS AT 825 PM CDT... BRANDON AND VALLEY SPRINGS AROUND 830 PM CDT... PALISADES STATE PARK...GARRETSON AND BALTIC AROUND 840 PM CDT... PRECAUTIONARY/PREPAREDNESS ACTIONS... SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER COVERS THE ROAD. && LAT...LON 4377 9677 4375 9638 4328 9647 4330 9679 TIME...MOT...LOC 0122Z 187DEG 46KT 4348 9660 WIND...HAIL 70MPH 1.00IN $$ HANKO
987 WWUS53 KFSD 220132 SVSFSD SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 832 PM CDT SAT MAY 21 2011 IAC119-MNC133-SDC083-099-220145- /O.CON.KFSD.SV.W.0080.000000T0000Z-110522T0145Z/ LYON IA-ROCK MN-MINNEHAHA SD-LINCOLN SD- 832 PM CDT SAT MAY 21 2011 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTH CENTRAL LINCOLN...EASTERN MINNEHAHA...SOUTHWESTERN ROCK AND NORTHWESTERN LYON COUNTIES UNTIL 845 PM CDT... AT 832 PM CDT...TRAINED WEATHER SPOTTERS REPORTED A SEVERE THUNDERSTORM PRODUCING QUARTER SIZE HAIL...AND DESTRUCTIVE WINDS IN EXCESS OF 70 MPH. THIS STORM WAS LOCATED NEAR ROWENA...OR 8 MILES EAST OF SIOUX FALLS...MOVING NORTH AT 45 MPH. THE SEVERE THUNDERSTORM WILL BE NEAR... PALISADES STATE PARK AROUND 840 PM CDT... GARRETSON AROUND 845 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. THIS STORM HAS A HISTORY OF PRODUCING DAMAGING WIND. THIS IS AN EXTREMELY DANGEROUS SITUATION. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS. && LAT...LON 4346 9644 4346 9671 4377 9677 4375 9638 TIME...MOT...LOC 0132Z 191DEG 40KT 4356 9656 WIND...HAIL 70MPH 1.00IN $$ HANKO
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 21, 7:49 PM CDT | Severe Thunderstorm Warning | FSD | Lyon | 26 min |
| May 21, 7:05 PM CDT | Severe Thunderstorm Warning | FSD | Clay, Turner | 25 min |
| May 21, 7:28 PM CDT | Severe Thunderstorm Warning | FSD | Clay, Lincoln, Turner | 32 min |
| May 21, 7:38 PM CDT | Severe Thunderstorm Warning | FSD | Clay, Union | 37 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 |
| May 21, 8:29 PM CDT | Severe Thunderstorm Warning | FSD | Jackson | 31 min |
| May 21, 8:57 PM CDT | Severe Thunderstorm Warning | FSD | Cottonwood, Jackson | 33 min |
| May 21, 9:17 PM CDT | Severe Thunderstorm Warning | FSD | Cottonwood, Jackson | 43 min |
| May 21, 9:32 PM CDT | Severe Thunderstorm Warning | FSD | Cottonwood | 13 min |
| May 21, 9:58 PM CDT | Severe Thunderstorm Warning | FSD | Cottonwood | 32 min |
Nearby
Severe Thunderstorm Warnings in South Dakota, 2011Severe Thunderstorm Warnings in Iowa, 2011Severe Thunderstorm Warnings in Minnesota, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.