Alert archive / Minnesota / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 110, NWS Twin Cities, MN
NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 28, 2021, 6:26 PM CDT for 4 counties in Minnesota. It was in force for 64 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, 6:26 PM CDT (23:26 UTC)
- Expired
- Aug 28, 2021, 7:30 PM CDT
- In force
- 64 min
- Issued by
- NWS Twin Cities, MN
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Hail
- 0.75 in
- Wind
- 70.0 mph
Counties Blue Earth County, MN, Faribault County, MN, Martin County, MN, Watonwan County, MN
The radar
The Minneapolis radar (KMPX), 123 km from the middle of the area, began a volume at 23:30 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, 6:45 PM CDT | FUNNEL CLOUD | 1 N Madelia, MN | FUNNEL CLOUD 1N MADELIA. |
| Aug 28, 6:50 PM CDT | TSTM WND DMG | St. James, MN | TREES DOWN IN ST. JAMES. |
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, 11.4 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
- 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.
719
WUUS53 KMPX 282326
SVRMPX
MNC013-043-091-165-290030-
/O.NEW.KMPX.SV.W.0110.210828T2326Z-210829T0030Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Twin Cities/Chanhassen MN
626 PM CDT Sat Aug 28 2021
The National Weather Service in the Twin Cities has issued a
* Severe Thunderstorm Warning for...
Northwestern Faribault County in south central Minnesota...
Northern Martin County in south central Minnesota...
Blue Earth County in south central Minnesota...
Watonwan County in south central Minnesota...
* Until 730 PM CDT.
* At 624 PM CDT, severe thunderstorms were located along a line
extending from near Comfrey to near Kilen Woods State Park, moving
east at 50 mph. At 615 PM CDT a 66 MPH wind gust was observed near
Windom, MN.
HAZARD...70 mph wind gusts.
SOURCE...Automated Observation.
IMPACT...Expect considerable tree damage. Damage is likely to
mobile homes, roofs, and outbuildings.
* Severe thunderstorms will be near...
Butterfield around 630 PM CDT.
St. James around 640 PM CDT.
Other locations in the path of these severe thunderstorms include
Trimont, Madelia, Lake Crystal, Truman, Good Thunder, Winnebago,
Amboy, St. Clair, Easton and Delavan.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4366 9485 4399 9486 4411 9440 4411 9437
4412 9436 4412 9379 4364 9389
TIME...MOT...LOC 2324Z 267DEG 44KT 4406 9491 4376 9510
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...OBSERVED
MAX WIND GUST...70 MPH
$$
NDC4 follow-up statements
854
WWUS53 KMPX 282338
SVSMPX
Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
638 PM CDT Sat Aug 28 2021
MNC043-282348-
/O.CAN.KMPX.SV.W.0110.000000T0000Z-210829T0030Z/
Faribault MN-
638 PM CDT Sat Aug 28 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN FARIBAULT COUNTY
IS CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 1100 PM CDT for
south central Minnesota.
LAT...LON 4396 9486 4401 9480 4411 9442 4411 9437
4412 9436 4412 9379 4386 9384 4385 9425
4383 9426 4379 9485
TIME...MOT...LOC 2338Z 250DEG 46KT 4412 9463 4389 9493
$$
MNC013-091-165-290030-
/O.CON.KMPX.SV.W.0110.000000T0000Z-210829T0030Z/
Martin MN-Blue Earth MN-Watonwan MN-
638 PM CDT Sat Aug 28 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM CDT
FOR NORTHERN MARTIN...BLUE EARTH AND WATONWAN COUNTIES...
At 638 PM CDT, severe thunderstorms were located along a line
extending from 7 miles west of Hanska to near Mountain Lake, moving
east at 55 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
St. James, Lewisville, Madelia, Vernon Center, Lake Crystal, Good
Thunder and St. Clair.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4396 9486 4401 9480 4411 9442 4411 9437
4412 9436 4412 9379 4386 9384 4385 9425
4383 9426 4379 9485
TIME...MOT...LOC 2338Z 250DEG 46KT 4412 9463 4389 9493
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...OBSERVED
MAX WIND GUST...60 MPH
$$
NDC145
WWUS53 KMPX 282353
SVSMPX
Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
653 PM CDT Sat Aug 28 2021
MNC091-290003-
/O.CAN.KMPX.SV.W.0110.000000T0000Z-210829T0030Z/
Martin MN-
653 PM CDT Sat Aug 28 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN MARTIN COUNTY IS
CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 1100 PM CDT for
south central Minnesota.
LAT...LON 4385 9472 4385 9485 4396 9486 4401 9480
4410 9441 4412 9436 4412 9379 4386 9384
4385 9426 4384 9471
TIME...MOT...LOC 2353Z 265DEG 41KT 4412 9440 4391 9476
$$
MNC013-165-290030-
/O.CON.KMPX.SV.W.0110.000000T0000Z-210829T0030Z/
Blue Earth MN-Watonwan MN-
653 PM CDT Sat Aug 28 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM CDT
FOR BLUE EARTH AND WATONWAN COUNTIES...
At 653 PM CDT, severe thunderstorms were located along a line
extending from 5 miles north of Madelia to near Butterfield, moving
east at 45 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
St. James, Lake Crystal, Madelia, Mapleton, St. Clair, Butterfield,
Good Thunder, Amboy, Vernon Center, Lewisville, Garden City and South
Branch.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4385 9472 4385 9485 4396 9486 4401 9480
4410 9441 4412 9436 4412 9379 4386 9384
4385 9426 4384 9471
TIME...MOT...LOC 2353Z 265DEG 41KT 4412 9440 4391 9476
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...OBSERVED
MAX WIND GUST...60 MPH
$$
NDC726
WWUS53 KMPX 290009
SVSMPX
Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
709 PM CDT Sat Aug 28 2021
MNC013-165-290030-
/O.CON.KMPX.SV.W.0110.000000T0000Z-210829T0030Z/
Blue Earth MN-Watonwan MN-
709 PM CDT Sat Aug 28 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM CDT
FOR BLUE EARTH AND EASTERN WATONWAN COUNTIES...
At 709 PM CDT, severe thunderstorms were located along a line
extending from near Lake Crystal to near Lewisville, moving east at
50 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Lake Crystal, Madelia, Mapleton, St. Clair, Good Thunder, Amboy,
Vernon Center, Lewisville, Garden City, Grogan and St James Airport.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4410 9441 4411 9430 4412 9379 4386 9384
4389 9458 4407 9456
TIME...MOT...LOC 0009Z 267DEG 44KT 4413 9416 4392 9452
TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
NDC734
WWUS53 KMPX 290030
SVSMPX
Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
730 PM CDT Sat Aug 28 2021
MNC013-165-290040-
/O.EXP.KMPX.SV.W.0110.000000T0000Z-210829T0030Z/
Blue Earth MN-Watonwan MN-
730 PM CDT Sat Aug 28 2021
...THE SEVERE THUNDERSTORM WARNING FOR BLUE EARTH AND EASTERN
WATONWAN COUNTIES HAS EXPIRED...
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 has been allowed to expire.
A Severe Thunderstorm Watch remains in effect until 1100 PM CDT for
south central Minnesota.
LAT...LON 4410 9441 4411 9430 4412 9379 4386 9384
4389 9458 4407 9456
TIME...MOT...LOC 0030Z 267DEG 44KT 4414 9384 4393 9420
$$
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, 6:06 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, 6:43 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.