Alert archive / South Dakota / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 161, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Sep 17, 2021, 12:29 AM CDT for Plymouth County, Sioux County, Iowa; 5 counties in South Dakota; Dixon County, Nebraska. It was in force for 46 min. 5 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
- Sep 17, 2021, 12:29 AM CDT (05:29 UTC)
- Expired
- Sep 17, 2021, 1:15 AM CDT
- In force
- 46 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Plymouth County, IA, Sioux County, IA, Dixon County, NE, Clay County, SD, Lincoln County, SD, Turner County, SD, Union County, SD, Yankton County, SD
The radar
The Sioux Falls radar (KFSD), 85 km from the middle of the area, began a volume at 05:28 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Sep 17, 12:38 AM CDT | TSTM WND GST 71 | 6 E Vermillion, SD | PERSONAL WEATHER STATION (KSDBURBA2). |
| Sep 17, 12:39 AM CDT | TSTM WND GST 63 | 3 Ssw Beresford, SD | MESONET STATION 16 SD RWIS BERESFORD. |
| Sep 17, 12:50 AM CDT | TSTM WND GST 63 | 1 Ssw Hawarden, IA | MESONET STATION FW6302 HAWARDEN. |
| Sep 17, 1:07 AM CDT | TSTM WND GST 63 | 2 Ne Maurice, IA | KSXK AWOS REPORTED GUST TO 63 MPH. |
| Sep 17, 1:15 AM CDT | TSTM WND DMG | Orange City, IA | CORRECTS TIME OF PREVIOUS TSTM WND DMG REPORT FROM ORANGE CITY. REPORT FROM ORANGE CITY IA, SPOTTER SENT PICTURE OF LARGE TREE BRANCH DOWNED DURING THE STORM. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 5.5 hours before the alert went out and 175 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
- 612 J/kg
- Mixed-layer CIN
- -165 J/kg
- Mixed-layer LCL
- 2155 m above ground
- 0-6 km bulk shear
- 11 kt
- 0-1 km storm-relative helicity
- 19 m²/s²
- 0-3 km storm-relative helicity
- 132 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
801
WUUS53 KFSD 170529
SVRFSD
IAC149-167-NEC051-SDC027-083-125-127-135-170615-
/O.NEW.KFSD.SV.W.0161.210917T0529Z-210917T0615Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Sioux Falls SD
1229 AM CDT Fri Sep 17 2021
The National Weather Service in Sioux Falls has issued a
* Severe Thunderstorm Warning for...
Sioux County in northwestern Iowa...
Western Plymouth County in northwestern Iowa...
Northern Dixon County in northeastern Nebraska...
Clay County in southeastern South Dakota...
Southern Lincoln County in southeastern South Dakota...
Southeastern Yankton County in southeastern South Dakota...
Southeastern Turner County in southeastern South Dakota...
Union County in southeastern South Dakota...
* Until 115 AM CDT.
* At 1228 AM CDT, severe thunderstorms were located along a line
extending from near Centerville to 6 miles west of Union Grove
State Park to near Hartington, moving east at 55 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Severe thunderstorms will be near...
Beresford and Union Grove State Park around 1235 AM CDT.
Alcester, Maskell and Newton Hills State Park around 1245 AM CDT.
Vermillion, Akron, Hudson and Fairview around 1250 AM CDT.
Hawarden and Newcastle around 1255 AM CDT.
Rock Valley, Ireton, Craig and Ponca State Park around 100 AM CDT.
Sioux Center and Elk Point around 105 AM CDT.
Hull, Jefferson, Maurice and Struble around 110 AM CDT.
Orange City, Alton and Boyden around 115 AM CDT.
Other locations impacted by these severe thunderstorms include
Gayville, Chatsworth, Brunsville and Westfield.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4258 9702 4276 9701 4277 9704 4277 9713
4280 9716 4281 9721 4285 9723 4286 9732
4294 9724 4323 9712 4326 9591 4291 9605
4257 9646
TIME...MOT...LOC 0528Z 270DEG 47KT 4315 9685 4294 9690 4270 9729
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
SG1 follow-up statement
716
WWUS53 KFSD 170601
SVSFSD
Severe Weather Statement
National Weather Service Sioux Falls SD
101 AM CDT Fri Sep 17 2021
SDC125-135-170610-
/O.CAN.KFSD.SV.W.0161.000000T0000Z-210917T0615Z/
Yankton SD-Turner SD-
101 AM CDT Fri Sep 17 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN YANKTON AND
SOUTHEASTERN TURNER COUNTIES IS CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
LAT...LON 4258 9698 4316 9670 4316 9595 4291 9605
4257 9646
TIME...MOT...LOC 0600Z 270DEG 47KT 4315 9628 4294 9633 4270 9672
$$
IAC149-167-NEC051-SDC027-083-127-170615-
/O.CON.KFSD.SV.W.0161.000000T0000Z-210917T0615Z/
Sioux IA-Plymouth IA-Dixon NE-Clay SD-Lincoln SD-Union SD-
101 AM CDT Fri Sep 17 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 115 AM CDT
FOR SOUTHERN SIOUX...WESTERN PLYMOUTH...NORTHERN DIXON...SOUTHEASTERN
CLAY...SOUTHEASTERN LINCOLN AND UNION COUNTIES...
At 100 AM CDT, severe thunderstorms were located along a line
extending from near Rock Valley to near Ireton to near Elk Point,
moving east at 55 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
These severe storms will be near...
Sioux Center, Ireton and Craig around 105 AM CDT.
Maurice and Struble around 110 AM CDT.
Orange City around 115 AM CDT.
Alton around 120 AM CDT.
Le Mars around 135 AM CDT.
Other locations impacted by these severe thunderstorms include
Brunsville, Westfield and Chatsworth.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4258 9698 4316 9670 4316 9595 4291 9605
4257 9646
TIME...MOT...LOC 0600Z 270DEG 47KT 4315 9628 4294 9633 4270 9672
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
SGThe office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 17, 12:36 AM CDT | Severe Thunderstorm Warning | FSD | Clay, Dickinson, Lyon, O'Brien, Osceola, Sioux | 54 min |
| Sep 17, 1:11 AM CDT | Severe Thunderstorm Warning | FSD | Buena Vista, Cherokee, Clay, Ida, O'Brien, Plymouth and 2 more | 49 min |
| Sep 17, 1:23 AM CDT | Severe Thunderstorm Warning | FSD | Clay, Dickinson, Lyon, O'Brien, Osceola, Sioux | 67 min |
| Sep 16, 10:20 PM CDT | Severe Thunderstorm Warning | FSD | Charles Mix, Gregory | 25 min |
| Sep 16, 11:31 PM CDT | Severe Thunderstorm Warning | FSD | Bon Homme, Charles Mix, Hutchinson, Yankton | 29 min |
| Sep 17, 12:10 AM CDT | Severe Thunderstorm Warning | FSD | Brookings, Lake, McCook, Minnehaha, Moody | 35 min |
| Sep 17, 12:34 AM CDT | Severe Thunderstorm Warning | FSD | Minnehaha | 56 min |
Nearby
Severe Thunderstorm Warnings in South Dakota, 2021Severe Thunderstorm Warnings in Iowa, 2021Severe Thunderstorm Warnings in Nebraska, 2021Every severe thunderstorm warning in 2021
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.