Alert archive / Minnesota / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 165, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Sep 17, 2021, 1:21 AM CDT for 5 counties in Minnesota. It was in force for 39 min. 1 report 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, 1:21 AM CDT (06:21 UTC)
- Expired
- Sep 17, 2021, 2:00 AM CDT
- In force
- 39 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Cottonwood County, MN, Jackson County, MN, Lyon County, MN, Murray County, MN, Nobles County, MN
The radar
The Sioux Falls radar (KFSD), 124 km from the middle of the area, began a volume at 06:20 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, 1:47 AM CDT | TSTM WND DMG | Mountain Lake, MN | SEVERAL 3-4 INCH DIAMETER BRANCHES DOWNED. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Aberdeen, SD (KABR), launched 00:00Z, 6.4 hours before the alert went out and 250 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
- 1789 m above ground
- 0-6 km bulk shear
- 75 kt
- 0-1 km storm-relative helicity
- -170 m²/s²
- 0-3 km storm-relative helicity
- 116 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
470
WUUS53 KFSD 170621
SVRFSD
MNC033-063-083-101-105-170700-
/O.NEW.KFSD.SV.W.0165.210917T0621Z-210917T0700Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Sioux Falls SD
121 AM CDT Fri Sep 17 2021
The National Weather Service in Sioux Falls has issued a
* Severe Thunderstorm Warning for...
Eastern Lyon County in southwestern Minnesota...
Northern Jackson County in southwestern Minnesota...
Northern Nobles County in southwestern Minnesota...
Eastern Murray County in southwestern Minnesota...
Cottonwood County in southwestern Minnesota...
* Until 200 AM CDT.
* At 120 AM CDT, severe thunderstorms were located along a line
extending from near Echo to near Walnut Grove to 7 miles northwest
of Worthington, 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...
Jeffers around 135 AM CDT.
Heron Lake around 140 AM CDT.
Other locations in the path of these severe thunderstorms include
Comfrey and Bergen.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4420 9559 4419 9511 4411 9510 4411 9486
4377 9485 4376 9593 4415 9576 4463 9572
4463 9561
TIME...MOT...LOC 0620Z 265DEG 46KT 4458 9546 4416 9545 4372 9568
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...OBSERVED
MAX WIND GUST...60 MPH
$$
SG2 follow-up statements
269
WWUS53 KFSD 170632
SVSFSD
Severe Weather Statement
National Weather Service Sioux Falls SD
132 AM CDT Fri Sep 17 2021
MNC083-170642-
/O.CAN.KFSD.SV.W.0165.000000T0000Z-210917T0700Z/
Lyon MN-
132 AM CDT Fri Sep 17 2021
...THE SEVERE THUNDERSTORM WARNING FOR EASTERN LYON COUNTY IS
CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
LAT...LON 4419 9511 4411 9510 4411 9486 4377 9485
4376 9580 4412 9561 4420 9559
TIME...MOT...LOC 0632Z 270DEG 46KT 4459 9529 4417 9528 4373 9551
$$
MNC033-063-101-105-170700-
/O.CON.KFSD.SV.W.0165.000000T0000Z-210917T0700Z/
Jackson MN-Nobles MN-Murray MN-Cottonwood MN-
132 AM CDT Fri Sep 17 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 200 AM CDT
FOR NORTHERN JACKSON...NORTHEASTERN NOBLES...EASTERN MURRAY AND
COTTONWOOD COUNTIES...
At 132 AM CDT, severe thunderstorms were located along a line
extending from 6 miles east of Echo to near Lamberton to near
Brewster, 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...
Jeffers around 140 AM CDT.
Other locations in the path of these severe thunderstorms include
Comfrey and Bergen.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4419 9511 4411 9510 4411 9486 4377 9485
4376 9580 4412 9561 4420 9559
TIME...MOT...LOC 0632Z 270DEG 46KT 4459 9529 4417 9528 4373 9551
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...OBSERVED
MAX WIND GUST...60 MPH
$$
SG457
WWUS53 KFSD 170655
SVSFSD
Severe Weather Statement
National Weather Service Sioux Falls SD
155 AM CDT Fri Sep 17 2021
MNC033-063-101-105-170704-
/O.EXP.KFSD.SV.W.0165.000000T0000Z-210917T0700Z/
Jackson MN-Nobles MN-Murray MN-Cottonwood MN-
155 AM CDT Fri Sep 17 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN JACKSON...
NORTHEASTERN NOBLES...EASTERN MURRAY AND COTTONWOOD COUNTIES WILL
EXPIRE AT 200 AM CDT...
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning will be allowed to expire. However gusty
winds and heavy rain are still possible with these thunderstorms.
Remember, a Severe Thunderstorm Warning still remains in effect for
portions of Jackson and Nobles counties in southwestern Minnesota
until 230 AM CDT.
LAT...LON 4419 9511 4411 9510 4411 9486 4377 9485
4376 9580 4412 9561 4420 9559
TIME...MOT...LOC 0654Z 270DEG 46KT 4461 9492 4419 9491 4375 9514
$$
SGThe office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 17, 12:10 AM CDT | Severe Thunderstorm Warning | FSD | Lincoln, Pipestone, Rock | 35 min |
| Sep 17, 12:34 AM CDT | Severe Thunderstorm Warning | FSD | Cottonwood, Jackson, Lincoln, Lyon, Murray, Nobles and 2 more | 56 min |
| Sep 17, 12:36 AM CDT | Severe Thunderstorm Warning | FSD | Jackson, Nobles, Rock | 54 min |
| Sep 17, 1:23 AM CDT | Severe Thunderstorm Warning | FSD | Jackson, Nobles | 67 min |
Nearby
Severe 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.