Alert archive / Iowa / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 115, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 27, 2021, 1:52 AM CDT for Jackson County, Nobles County, Minnesota; 6 counties in Iowa. It was in force for 68 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 27, 2021, 1:52 AM CDT (06:52 UTC)
- Expired
- Aug 27, 2021, 3:00 AM CDT
- In force
- 68 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Buena Vista County, IA, Cherokee County, IA, Clay County, IA, Dickinson County, IA, O'Brien County, IA, Osceola County, IA, Jackson County, MN, Nobles County, MN
The radar
The Sioux Falls radar (KFSD), 129 km from the middle of the area, began a volume at 06:50 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 26, 8:03 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Minneapolis, MN (KMPX), launched 00:00Z, 6.9 hours before the alert went out and 207 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 792 m above ground
- 0-6 km bulk shear
- 49 kt
- 0-1 km storm-relative helicity
- 393 m²/s²
- 0-3 km storm-relative helicity
- 392 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted.
072
WUUS53 KFSD 270652
SVRFSD
IAC021-035-041-059-141-143-MNC063-105-270800-
/O.NEW.KFSD.SV.W.0115.210827T0652Z-210827T0800Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Sioux Falls SD
152 AM CDT Fri Aug 27 2021
The National Weather Service in Sioux Falls has issued a
* Severe Thunderstorm Warning for...
Northern Cherokee County in northwestern Iowa...
Osceola County in northwestern Iowa...
Dickinson County in northwestern Iowa...
Northern Buena Vista County in northwestern Iowa...
Clay County in northwestern Iowa...
O'Brien County in northwestern Iowa...
Southern Jackson County in southwestern Minnesota...
Southeastern Nobles County in southwestern Minnesota...
* Until 300 AM CDT.
* At 152 AM CDT, severe thunderstorms were located along a line
extending from near Ocheyedan to near Sanborn to near Paullina,
moving east at 45 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Severe thunderstorms will be near...
Hartley and Ocheyedan around 200 AM CDT.
Round Lake and Harris around 205 AM CDT.
Everly around 210 AM CDT.
Other locations in the path of these severe thunderstorms include
Lake Park, Peterson, Spencer In Clay County, Okoboji, Royal,
Wahpeton, Fostoria, Linn Grove, Spirit Lake, Sioux Rapids, Orleans,
Greenville, Terril, Webb and Superior.
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 4350 9491 4289 9492 4290 9585 4355 9582
4367 9485 4350 9485
TIME...MOT...LOC 0652Z 259DEG 37KT 4344 9563 4318 9560 4291 9568
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
SG2 follow-up statements
418
WWUS53 KFSD 270726
SVSFSD
Severe Weather Statement
National Weather Service Sioux Falls SD
226 AM CDT Fri Aug 27 2021
IAC035-MNC105-270736-
/O.CAN.KFSD.SV.W.0115.000000T0000Z-210827T0800Z/
Cherokee IA-Nobles MN-
226 AM CDT Fri Aug 27 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN CHEROKEE AND
SOUTHEASTERN NOBLES COUNTIES IS CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 300 AM CDT for
northwestern Iowa.
LAT...LON 4350 9491 4289 9492 4289 9538 4291 9541
4360 9539 4367 9485 4350 9485
TIME...MOT...LOC 0726Z 259DEG 37KT 4350 9518 4324 9515 4297 9523
$$
IAC021-041-059-141-143-MNC063-270800-
/O.CON.KFSD.SV.W.0115.000000T0000Z-210827T0800Z/
Osceola IA-Dickinson IA-Buena Vista IA-Clay IA-O'Brien IA-Jackson MN-
226 AM CDT Fri Aug 27 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 AM CDT
FOR EASTERN OSCEOLA...DICKINSON...NORTHERN BUENA VISTA...CLAY...
EASTERN O'BRIEN AND SOUTHERN JACKSON COUNTIES...
At 226 AM CDT, severe thunderstorms were located along a line
extending from near Orleans to Fostoria to near Greenville, moving
east at 45 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Spirit Lake, Arnolds Park, Okoboji, Orleans, Terril, Webb and
Superior.
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 4350 9491 4289 9492 4289 9538 4291 9541
4360 9539 4367 9485 4350 9485
TIME...MOT...LOC 0726Z 259DEG 37KT 4350 9518 4324 9515 4297 9523
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
SG176
WWUS53 KFSD 270751
SVSFSD
Severe Weather Statement
National Weather Service Sioux Falls SD
251 AM CDT Fri Aug 27 2021
IAC021-041-059-141-143-MNC063-270801-
/O.EXP.KFSD.SV.W.0115.000000T0000Z-210827T0800Z/
Osceola IA-Dickinson IA-Buena Vista IA-Clay IA-O'Brien IA-Jackson MN-
251 AM CDT Fri Aug 27 2021
...THE SEVERE THUNDERSTORM WARNING FOR EASTERN OSCEOLA...DICKINSON...
NORTHERN BUENA VISTA...CLAY...EASTERN O'BRIEN AND SOUTHERN JACKSON
COUNTIES WILL EXPIRE AT 300 AM CDT...
The storms which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire. However gusty
winds are still possible with these thunderstorms.
A Severe Thunderstorm Watch remains in effect until 300 AM CDT for
northwestern Iowa.
LAT...LON 4350 9491 4289 9492 4289 9538 4291 9541
4360 9539 4367 9485 4350 9485
TIME...MOT...LOC 0751Z 259DEG 37KT 4355 9484 4329 9481 4302 9489
$$
WeisserThe office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 27, 12:17 AM CDT | Severe Thunderstorm Warning | FSD | Lyon, Sioux | 28 min |
| Aug 27, 12:34 AM CDT | Severe Thunderstorm Warning | FSD | Plymouth, Sioux | 41 min |
| Aug 27, 1:04 AM CDT | Tornado Warning | FSD | Sioux | 26 min |
| Aug 27, 1:09 AM CDT | Severe Thunderstorm Warning | FSD | Cherokee, Lyon, O'Brien, Osceola, Plymouth, Sioux | 51 min |
| Aug 27, 1:25 AM CDT | Severe Thunderstorm Warning | FSD | Cherokee, Ida, Plymouth, Woodbury | 50 min |
| Aug 27, 2:00 AM CDT | Severe Thunderstorm Warning | FSD | Buena Vista | 60 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 2021Severe Thunderstorm Warnings in Minnesota, 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.