Alert archive / Minnesota / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 116, NWS Twin Cities, MN
NWS Twin Cities, MN issued this severe thunderstorm warning at Sep 16, 2021, 6:30 PM CDT for Chippewa County, Kandiyohi County, Swift County, Minnesota. It was in force for 45 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 16, 2021, 6:30 PM CDT (23:30 UTC)
- Expired
- Sep 16, 2021, 7:15 PM CDT
- In force
- 45 min
- Issued by
- NWS Twin Cities, MN
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Chippewa County, MN, Kandiyohi County, MN, Swift County, MN
The radar
The Minneapolis radar (KMPX), 124 km from the middle of the area, began a volume at 23:33 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 16, 6:38 PM CDT | HAIL 1 | 1 Se Kerkhoven, MN | MOSTLY DIME TO NICKEL SIZE HAIL. LARGEST STONES WERE QUARTER SIZED. DELAYED STORM REPORT. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Minneapolis, MN (KMPX), launched 12:00Z, 11.5 hours before the alert went out and 122 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
- 1213 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 362 m²/s²
- 0-3 km storm-relative helicity
- 428 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.0
The text
As transmitted.
173
WUUS53 KMPX 162330
SVRMPX
MNC023-067-151-170015-
/O.NEW.KMPX.SV.W.0116.210916T2330Z-210917T0015Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Twin Cities/Chanhassen MN
630 PM CDT Thu Sep 16 2021
The National Weather Service in the Twin Cities has issued a
* Severe Thunderstorm Warning for...
Northeastern Chippewa County in west central Minnesota...
Southeastern Swift County in west central Minnesota...
Northern Kandiyohi County in central Minnesota...
* Until 715 PM CDT.
* At 629 PM CDT, a severe thunderstorm was located over Kerkhoven, or
13 miles west of Willmar, moving east at 45 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage
to roofs, siding, and trees.
* This severe thunderstorm will be near...
Willmar around 645 PM CDT.
Other locations in the path of this severe thunderstorm include New
London and Spicer.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4519 9543 4542 9490 4542 9479 4541 9477
4539 9476 4518 9476 4507 9532
TIME...MOT...LOC 2329Z 248DEG 34KT 4516 9532
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
BPH1 follow-up statement
682
WWUS53 KMPX 162345
SVSMPX
Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
645 PM CDT Thu Sep 16 2021
MNC151-162355-
/O.CAN.KMPX.SV.W.0116.000000T0000Z-210917T0015Z/
Swift MN-
645 PM CDT Thu Sep 16 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN SWIFT COUNTY IS
CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 200 AM CDT for
central and west central Minnesota.
LAT...LON 4516 9525 4526 9526 4542 9490 4541 9477
4518 9476 4507 9532 4515 9539
TIME...MOT...LOC 2345Z 248DEG 34KT 4522 9512
$$
MNC023-067-170015-
/O.CON.KMPX.SV.W.0116.000000T0000Z-210917T0015Z/
Chippewa MN-Kandiyohi MN-
645 PM CDT Thu Sep 16 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM CDT
FOR NORTHEASTERN CHIPPEWA AND NORTHERN KANDIYOHI COUNTIES...
At 645 PM CDT, a severe thunderstorm was located 7 miles northwest of
Willmar, moving east at 40 mph.
HAZARD...Ping pong ball size hail and 60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect hail
damage to roofs, siding, windows, and vehicles. Expect wind
damage to roofs, siding, and trees.
Locations impacted include...
New London and Spicer.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4516 9525 4526 9526 4542 9490 4541 9477
4518 9476 4507 9532 4515 9539
TIME...MOT...LOC 2345Z 248DEG 34KT 4522 9512
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
NDCThe office that day
Everything else NWS Twin Cities, MN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 16, 5:45 PM CDT | Tornado Warning | MPX | Morrison, Todd | 33 min |
| Sep 16, 6:14 PM CDT | Special Weather Statement | MPX | Morrison | 31 min |
| Sep 16, 6:25 PM CDT | Severe Thunderstorm Warning | MPX | Morrison | 35 min |
| Sep 16, 6:26 PM CDT | Severe Thunderstorm Warning | MPX | Benton, Morrison, Stearns | 49 min |
| Sep 16, 6:32 PM CDT | Special Weather Statement | MPX | Stearns | 43 min |
| Sep 16, 6:32 PM CDT | Tornado Warning | MPX | Mille Lacs, Morrison | 43 min |
| Sep 16, 6:40 PM CDT | Severe Thunderstorm Warning | MPX | Chippewa, Lac qui Parle, Renville, Yellow Medicine | 35 min |
| Sep 16, 6:48 PM CDT | Severe Thunderstorm Warning | MPX | Stearns | 42 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.