Alert archive / Minnesota / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 100, NWS Twin Cities, MN
NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 28, 2021, 9:54 AM CDT for Swift County, Minnesota. It was in force for 51 min. 2 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
- Aug 28, 2021, 9:54 AM CDT (14:54 UTC)
- Expired
- Aug 28, 2021, 10:45 AM CDT
- In force
- 51 min
- Issued by
- NWS Twin Cities, MN
- Area
- Storm-based polygon
- Hail
- 1.5 in
- Wind
- 60.0 mph
County Swift County, MN
The radar
The Aberdeen radar (KABR), 192 km from the middle of the area, began a volume at 14:54 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 |
|---|---|---|---|
| Aug 28, 10:00 AM CDT | HAIL 3.1 | 7 Nw Appleton, MN | PICS OF HAIL COMPARED TO TAPE MEASURE ON TWITTER. |
| Aug 28, 10:24 AM CDT | HAIL 2.75 | 1 N Danvers, MN | IN ADDITION TO HIGH WINDS AND HEAVY RAIN. RELAYED VIA LAW ENFORCEMENT. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
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, 7:08 AM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Minneapolis, MN (KMPX), launched 12:00Z, 2.9 hours before the alert went out and 192 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
- 1550 J/kg
- Mixed-layer CIN
- -130 J/kg
- Mixed-layer LCL
- 676 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 139 m²/s²
- 0-3 km storm-relative helicity
- 193 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.3
The text
As transmitted.
319
WUUS53 KMPX 281454
SVRMPX
MNC151-281545-
/O.NEW.KMPX.SV.W.0100.210828T1454Z-210828T1545Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Twin Cities/Chanhassen MN
954 AM CDT Sat Aug 28 2021
The National Weather Service in the Twin Cities has issued a
* Severe Thunderstorm Warning for...
Northwestern Swift County in west central Minnesota...
* Until 1045 AM CDT.
* At 954 AM CDT, a severe thunderstorm was located near Artichoke
Lake, or 16 miles east of Ortonville, 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...
Benson and Lake Hassel.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4527 9611 4540 9612 4542 9602 4541 9587
4541 9556 4522 9553 4521 9610 4524 9610
4524 9612
TIME...MOT...LOC 1454Z 263DEG 35KT 4531 9610
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$2 follow-up statements
114
WWUS53 KMPX 281511
SVSMPX
Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
1011 AM CDT Sat Aug 28 2021
MNC151-281545-
/O.CON.KMPX.SV.W.0100.000000T0000Z-210828T1545Z/
Swift MN-
1011 AM CDT Sat Aug 28 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1045 AM CDT
FOR NORTHWESTERN SWIFT COUNTY...
At 1011 AM CDT, a severe thunderstorm was located 8 miles east of
Lake Oliver, or 17 miles south of Morris, moving east at 40 mph.
HAZARD...Two inch hail and 60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect hail
damage to roofs, siding, windows, and vehicles. Expect wind
damage to roofs, siding, and trees.
This severe storm will be near...
Benson around 1030 AM CDT.
Lake Hassel around 1035 AM CDT.
Other locations impacted by this severe thunderstorm include Benson
Airport, Danvers, Appleton Airport, Clontarf and Holloway.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4542 9602 4541 9587 4541 9556 4522 9553
4521 9601 4541 9607
TIME...MOT...LOC 1511Z 263DEG 35KT 4533 9586
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...2.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$423
WWUS53 KMPX 281544
SVSMPX
Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
1044 AM CDT Sat Aug 28 2021
MNC151-281553-
/O.EXP.KMPX.SV.W.0100.000000T0000Z-210828T1545Z/
Swift MN-
1044 AM CDT Sat Aug 28 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN SWIFT COUNTY WILL
EXPIRE AT 1045 AM CDT...
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.
A Severe Thunderstorm Watch remains in effect until noon CDT for west
central Minnesota.
Remember, a Severe Thunderstorm Warning still remains in effect for
for northeast Swift county until 1115 am.
LAT...LON 4542 9602 4541 9587 4541 9556 4522 9553
4521 9601 4541 9607
TIME...MOT...LOC 1543Z 263DEG 35KT 4537 9542
$$The office that day
Everything else NWS Twin Cities, MN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 27, 8:21 PM CDT | Flash Flood Warning | MPX | Freeborn | 4 hr |
| Aug 27, 11:48 PM CDT | Special Weather Statement | MPX | Freeborn | 87 min |
| Aug 28, 8:14 AM CDT | Special Weather Statement | MPX | Stevens | 61 min |
| Aug 28, 9:27 AM CDT | Severe Thunderstorm Warning | MPX | Lac qui Parle | 33 min |
| Aug 28, 9:49 AM CDT | Severe Thunderstorm Warning | MPX | Douglas, Pope, Stevens | 56 min |
| Aug 28, 10:31 AM CDT | Severe Thunderstorm Warning | MPX | Swift | 44 min |
| Aug 28, 10:41 AM CDT | Severe Thunderstorm Warning | MPX | Douglas, Pope, Stearns, Todd | 49 min |
| Aug 28, 10:53 AM CDT | Severe Thunderstorm Warning | MPX | Kandiyohi | 52 min |
| Aug 28, 11:20 AM CDT | Severe Thunderstorm Warning | MPX | Stearns | 40 min |
| Aug 28, 11:24 AM CDT | Tornado Warning | MPX | Stearns | 36 min |
| Aug 28, 11:32 AM CDT | Severe Thunderstorm Warning | MPX | Morrison, Todd | 43 min |
| Aug 28, 11:45 AM CDT | Severe Thunderstorm Warning | MPX | Benton, Mille Lacs, Morrison, Sherburne | 45 min |
| Aug 28, 12:04 PM CDT | Tornado Warning | MPX | Benton, Mille Lacs | 41 min |
| Aug 28, 12:27 PM CDT | Severe Thunderstorm Warning | MPX | Isanti, Kanabec, Mille Lacs | 48 min |
| Aug 28, 12:43 PM CDT | Special Weather Statement | MPX | Anoka | 47 min |
| Aug 28, 1:07 PM CDT | Special Weather Statement | MPX | Chisago | 23 min |
| Aug 28, 1:29 PM CDT | Severe Thunderstorm Warning | MPX | Chisago, Isanti | 46 min |
| Aug 28, 6:06 PM CDT | Severe Thunderstorm Warning | MPX | Brown, Redwood, Watonwan | 54 min |
| Aug 28, 6:19 PM CDT | Tornado Warning | MPX | Brown, Redwood | 26 min |
| Aug 28, 6:26 PM CDT | Severe Thunderstorm Warning | MPX | Blue Earth, Faribault, Martin, Watonwan | 64 min |
| Aug 28, 6:43 PM CDT | Severe Thunderstorm Warning | MPX | Blue Earth, Brown, Nicollet, Redwood, Renville, Sibley and 1 more | 62 min |
| Aug 28, 6:51 PM CDT | Tornado Warning | MPX | Brown, Nicollet | 24 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.