Alert archive / Iowa / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 143, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 28, 2021, 8:52 PM CDT for Lincoln County, Minnehaha County, South Dakota; Lyon County, Osceola County, Sioux County, Iowa; Murray County, Nobles County, Rock County, Minnesota. It was in force for 23 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
- Aug 28, 2021, 8:52 PM CDT (01:52 UTC)
- Expired
- Aug 28, 2021, 9:15 PM CDT
- In force
- 23 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Lyon County, IA, Osceola County, IA, Sioux County, IA, Murray County, MN, Nobles County, MN, Rock County, MN, Lincoln County, SD, Minnehaha County, SD
The radar
The Sioux Falls radar (KFSD), 55 km from the middle of the area, began a volume at 01:56 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Aug 28, 3:57 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Aberdeen, SD (KABR), launched 00:00Z, 1.9 hours before the alert went out and 242 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
- 143 J/kg
- Mixed-layer CIN
- -122 J/kg
- Mixed-layer LCL
- 1242 m above ground
- 0-6 km bulk shear
- 71 kt
- 0-1 km storm-relative helicity
- -15 m²/s²
- 0-3 km storm-relative helicity
- 268 m²/s²
- Significant tornado parameter
- -0.0
- Supercell composite
- -0.2
The text
As transmitted.
685
WUUS53 KFSD 290152
SVRFSD
IAC119-143-167-MNC101-105-133-SDC083-099-290215-
/O.NEW.KFSD.SV.W.0143.210829T0152Z-210829T0215Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Sioux Falls SD
852 PM CDT Sat Aug 28 2021
The National Weather Service in Sioux Falls has issued a
* Severe Thunderstorm Warning for...
Lyon County in northwestern Iowa...
Northwestern Osceola County in northwestern Iowa...
Northern Sioux County in northwestern Iowa...
Rock County in southwestern Minnesota...
Nobles County in southwestern Minnesota...
South central Murray County in southwestern Minnesota...
Southeastern Minnehaha County in southeastern South Dakota...
Central Lincoln County in southeastern South Dakota...
* Until 915 PM CDT.
* At 851 PM CDT, severe thunderstorms were located along a line
extending from near Hardwick to near Luverne to near Inwood to near
Canton, moving east at 70 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Severe thunderstorms will be near...
Luverne and Leota around 855 PM CDT.
Adrian and Lismore around 900 PM CDT.
Rock Rapids, Rushmore and Wilmont around 905 PM CDT.
Rock Valley and Doon around 910 PM CDT.
Worthington, George, Brewster, Ellsworth and Little Rock around
915 PM CDT.
Other locations impacted by these severe thunderstorms include
Kinbrae, Kenneth, Steen, Magnolia and Bigelow.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4342 9566 4321 9593 4318 9688 4336 9668
4365 9643 4385 9634 4385 9548 4366 9548
TIME...MOT...LOC 0151Z 259DEG 60KT 4379 9612 4363 9612 4338 9650 4326
9667
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 |
|---|---|---|---|---|
| Aug 28, 7:23 PM CDT | Severe Thunderstorm Warning | FSD | Lincoln | 52 min |
| Aug 28, 7:25 PM CDT | Severe Thunderstorm Warning | FSD | Hanson, Lake, McCook, Miner, Minnehaha, Moody | 50 min |
| Aug 28, 7:27 PM CDT | Severe Thunderstorm Warning | FSD | Bon Homme, Hutchinson, Turner, Yankton | 48 min |
| Aug 28, 7:48 PM CDT | Severe Thunderstorm Warning | FSD | Lake, McCook, Minnehaha, Moody, Turner | 31 min |
| Aug 28, 7:50 PM CDT | Severe Thunderstorm Warning | FSD | Bon Homme, Clay, Hutchinson, Lincoln, Turner, Yankton | 40 min |
| Aug 28, 9:13 PM CDT | Severe Thunderstorm Warning | FSD | Lincoln | 47 min |
| Aug 28, 9:20 PM CDT | Flash Flood Warning | FSD | Lincoln, Minnehaha | 85 min |
| Aug 28, 9:29 PM CDT | Flash Flood Warning | FSD | Lincoln, Minnehaha | 3 hr |
| Aug 28, 10:36 PM CDT | Flash Flood Warning | FSD | Lincoln, Minnehaha | 114 min |
| Aug 28, 11:46 PM CDT | River Flood Warning | FSD | Lincoln, Minnehaha | 8 hr |
| Aug 29, 7:44 AM CDT | River Flood Warning | FSD | Lincoln | 15 hr |
| Aug 28, 10:04 PM CDT | Flash Flood Warning | FSD | Lyon, Osceola | 4 hr |
| Aug 28, 10:24 PM CDT | Flash Flood Warning | FSD | Dickinson, Osceola | 5 hr |
| Aug 28, 7:00 PM CDT | Severe Thunderstorm Warning | FSD | Lincoln, Lyon, Murray, Pipestone | 45 min |
| Aug 28, 7:34 PM CDT | Severe Thunderstorm Warning | FSD | Lyon, Murray, Pipestone | 56 min |
| Aug 28, 8:03 PM CDT | Flash Flood Warning | FSD | Murray, Pipestone | 6 hr |
| Aug 28, 8:06 PM CDT | Severe Thunderstorm Warning | FSD | Nobles, Rock | 54 min |
| Aug 28, 8:17 PM CDT | Severe Thunderstorm Warning | FSD | Cottonwood, Lyon, Murray | 58 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 2021Severe Thunderstorm Warnings in Minnesota, 2021Severe Thunderstorm Warnings in South Dakota, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.