Alert archive / Minnesota / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 109, NWS Twin Cities, MN
NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 28, 2021, 6:06 PM CDT for Brown County, Redwood County, Watonwan County, Minnesota. It was in force for 54 min. 6 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, 6:06 PM CDT (23:06 UTC)
- Expired
- Aug 28, 2021, 7:00 PM CDT
- In force
- 54 min
- Issued by
- NWS Twin Cities, MN
- Area
- Storm-based polygon
- Tornado
- Possible
- Damage threat
- Considerable
- Hail
- 0.75 in
- Wind
- 70.0 mph
Counties Brown County, MN, Redwood County, MN, Watonwan County, MN
The radar
The Minneapolis radar (KMPX), 121 km from the middle of the area, began a volume at 23:06 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, 6:20 PM CDT | TSTM WND DMG | 4 N Comfrey, MN | LARGE TREE SNAPPED AND SMALLER TREES DOWN. PICS SENT VIA TWITTER. |
| Aug 28, 6:20 PM CDT | TSTM WND DMG | Comfrey, MN | LARGE TREE UPROOTED. PIC SENT VIA TWITTER. |
| Aug 28, 6:30 PM CDT | TSTM WND DMG | 6 Nnw Sveadahl, MN | LARGE TREE DOWN. |
| Aug 28, 6:46 PM CDT | TSTM WND DMG | Sleepy Eye, MN | WIND DAMAGE/TREES DOWN SOUTH PART OF SLEEPY EYE. |
| Aug 28, 6:50 PM CDT | TSTM WND DMG | Sveadahl, MN | TREES DOWN IN SVEADAHL. |
| Aug 28, 6:58 PM CDT | TSTM WND DMG | Comfrey, MN | REPORT FROM MPING: 1-INCH TREE LIMBS BROKEN; SHINGLES BLOWN OFF. |
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, 5:59 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Minneapolis, MN (KMPX), launched 12:00Z, 11.1 hours before the alert went out and 118 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.
761
WUUS53 KMPX 282306
SVRMPX
MNC015-127-165-290000-
/O.NEW.KMPX.SV.W.0109.210828T2306Z-210829T0000Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Twin Cities/Chanhassen MN
606 PM CDT Sat Aug 28 2021
The National Weather Service in the Twin Cities has issued a
* Severe Thunderstorm Warning for...
Redwood County in southwestern Minnesota...
Brown County in south central Minnesota...
Northwestern Watonwan County in south central Minnesota...
* Until 700 PM CDT.
* At 605 PM CDT, severe thunderstorms were located along a line
extending from near Tracy to 6 miles southeast of Storden, moving
northeast at 55 mph.
HAZARD...70 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect considerable tree damage. Damage is likely to
mobile homes, roofs, and outbuildings.
* Severe thunderstorms will be near...
Wabasso around 625 PM CDT.
Other locations in the path of these severe thunderstorms include
Comfrey, Redwood Falls, Morgan, Franklin, Morton, Hanska and New Ulm.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4411 9486 4411 9509 4419 9510 4420 9560
4435 9559 4459 9511 4452 9488 4445 9478
4443 9470 4439 9467 4435 9449 4427 9442
4426 9437 4412 9437 4397 9486
TIME...MOT...LOC 2305Z 245DEG 48KT 4428 9557 4395 9525
TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH
$$
NDC1 follow-up statement
619
WWUS53 KMPX 282331
SVSMPX
Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
631 PM CDT Sat Aug 28 2021
MNC015-127-165-290000-
/O.CON.KMPX.SV.W.0109.000000T0000Z-210829T0000Z/
Redwood MN-Brown MN-Watonwan MN-
631 PM CDT Sat Aug 28 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM CDT
FOR REDWOOD...BROWN AND NORTHWESTERN WATONWAN COUNTIES...
At 630 PM CDT, severe thunderstorms were located along a line
extending from near Wabasso to near Comfrey, moving east at 55 mph.
HAZARD...70 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect considerable tree damage. Damage is likely to mobile
homes, roofs, and outbuildings.
Locations impacted include...
Comfrey, Morgan, Franklin, Hanska and New Ulm.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4411 9486 4411 9509 4419 9510 4420 9546
4440 9550 4459 9511 4452 9488 4445 9478
4443 9470 4439 9467 4435 9449 4427 9442
4426 9437 4412 9437 4397 9486
TIME...MOT...LOC 2330Z 270DEG 48KT 4441 9518 4408 9486
TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH
$$
NDCThe 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, 9:54 AM CDT | Severe Thunderstorm Warning | MPX | Swift | 51 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, 6:19 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.