Alert archive / Minnesota / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 57, NWS Twin Cities, MN
NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 28, 2021, 11:59 AM CDT for Chisago County, Washington County, Minnesota; Polk County, Saint Croix County, Wisconsin. It was in force for 31 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jul 28, 2021, 11:59 AM CDT (16:59 UTC)
- Expired
- Jul 28, 2021, 12:30 PM CDT
- In force
- 31 min
- Issued by
- NWS Twin Cities, MN
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Chisago County, MN, Washington County, MN, Polk County, WI, Saint Croix County, WI
The radar
The Minneapolis radar (KMPX), 78 km from the middle of the area, began a volume at 17:01 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.
The nearest sounding before it
Minneapolis, MN (KMPX), launched 12:00Z, 5.0 hours before the alert went out and 80 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
- 1458 J/kg
- Mixed-layer CIN
- -205 J/kg
- Mixed-layer LCL
- 1435 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 1 m²/s²
- 0-3 km storm-relative helicity
- 154 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.6
The text
As transmitted.
290
WUUS53 KMPX 281659
SVRMPX
MNC025-163-WIC095-109-281730-
/O.NEW.KMPX.SV.W.0057.210728T1659Z-210728T1730Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Twin Cities/Chanhassen MN
1159 AM CDT Wed Jul 28 2021
The National Weather Service in the Twin Cities has issued a
* Severe Thunderstorm Warning for...
Southeastern Chisago County in east central Minnesota...
Northeastern Washington County in east central Minnesota...
Northwestern St. Croix County in west central Wisconsin...
South central Polk County in northwestern Wisconsin...
* Until 1230 PM CDT.
* At 1159 AM CDT, a severe thunderstorm was located over Scandia
moving east at 40 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...
Osceola around 1205 PM CDT.
Other locations in the path of this severe thunderstorm include New
Richmond and Star Prairie.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4533 9301 4542 9295 4529 9238 4506 9259
TIME...MOT...LOC 1659Z 289DEG 33KT 4528 9278
HAIL...1.00IN
WIND...60MPH
$$
Dye3 follow-up statements
637
WWUS53 KMPX 281709
SVSMPX
Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
1209 PM CDT Wed Jul 28 2021
MNC025-163-WIC095-109-281730-
/O.CON.KMPX.SV.W.0057.000000T0000Z-210728T1730Z/
Chisago MN-Washington MN-St. Croix WI-Polk WI-
1209 PM CDT Wed Jul 28 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1230 PM CDT
FOR SOUTHEASTERN CHISAGO...NORTHEASTERN WASHINGTON...NORTHWESTERN ST.
CROIX AND SOUTH CENTRAL POLK COUNTIES...
At 1209 PM CDT, a severe thunderstorm was located near Osceola, or 26
miles north of River Falls, moving east at 40 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
New Richmond and Star Prairie.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4525 9289 4537 9277 4529 9238 4506 9259
TIME...MOT...LOC 1709Z 289DEG 33KT 4525 9265
HAIL...1.00IN
WIND...60MPH
$$
Dye615
WWUS53 KMPX 281720
SVSMPX
Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
1220 PM CDT Wed Jul 28 2021
MNC025-163-WIC095-281730-
/O.CAN.KMPX.SV.W.0057.000000T0000Z-210728T1730Z/
Chisago MN-Washington MN-Polk WI-
1220 PM CDT Wed Jul 28 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN CHISAGO...
NORTHEASTERN WASHINGTON AND SOUTH CENTRAL POLK COUNTIES IS
CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
LAT...LON 4520 9246 4506 9259 4517 9275 4519 9276
4521 9269 4521 9252
TIME...MOT...LOC 1720Z 289DEG 33KT 4522 9251
$$
WIC109-281730-
/O.CON.KMPX.SV.W.0057.000000T0000Z-210728T1730Z/
St. Croix WI-
1220 PM CDT Wed Jul 28 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1230 PM CDT
FOR NORTHWESTERN ST. CROIX COUNTY...
At 1220 PM CDT, a severe thunderstorm was located over Star Prairie,
or 25 miles north of River Falls, moving east at 40 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
New Richmond, Somerset, Star Prairie, Huntington, New Richmond
Airport and Boardman.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4520 9246 4506 9259 4517 9275 4519 9276
4521 9269 4521 9252
TIME...MOT...LOC 1720Z 289DEG 33KT 4522 9251
HAIL...1.00IN
WIND...60MPH
$$
Dye726
WWUS53 KMPX 281728
SVSMPX
Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
1228 PM CDT Wed Jul 28 2021
WIC109-281738-
/O.EXP.KMPX.SV.W.0057.000000T0000Z-210728T1730Z/
St. Croix WI-
1228 PM CDT Wed Jul 28 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN ST. CROIX COUNTY
WILL EXPIRE AT 1230 PM CDT...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire. However small hail
and gusty winds are still possible with this thunderstorm.
LAT...LON 4520 9246 4506 9259 4517 9275 4519 9276
4521 9269 4521 9252
TIME...MOT...LOC 1728Z 289DEG 33KT 4520 9243
$$
DyeThe office that day
Everything else NWS Twin Cities, MN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 28, 4:13 AM CDT | Special Weather Statement | MPX | Pope, Stevens | 32 min |
| Jul 28, 4:19 AM CDT | Special Weather Statement | MPX | Todd | 26 min |
| Jul 28, 4:45 AM CDT | Special Weather Statement | MPX | Stearns | 30 min |
| Jul 28, 4:46 AM CDT | Special Weather Statement | MPX | Chippewa, Pope, Stevens, Swift | 44 min |
| Jul 28, 4:53 AM CDT | Severe Thunderstorm Warning | MPX | Pope, Stevens | 28 min |
| Jul 28, 4:54 AM CDT | Severe Thunderstorm Warning | MPX | Stearns, Todd | 36 min |
| Jul 28, 5:29 AM CDT | Severe Thunderstorm Warning | MPX | Kandiyohi, Meeker, Stearns | 46 min |
| Jul 28, 6:17 AM CDT | Special Weather Statement | MPX | Meeker | 28 min |
| Jul 28, 6:45 AM CDT | Special Weather Statement | MPX | Carver, Wright | 30 min |
| Jul 28, 7:19 AM CDT | Special Weather Statement | MPX | Carver, Le Sueur, Nicollet | 41 min |
| Jul 28, 11:43 AM CDT | Special Weather Statement | MPX | Chisago | 32 min |
| Jul 28, 12:28 PM CDT | Special Weather Statement | MPX | Saint Croix | 32 min |
| Jul 28, 12:54 PM CDT | Special Weather Statement | MPX | Pierce | 36 min |
Nearby
Severe Thunderstorm Warnings in Minnesota, 2021Severe Thunderstorm Warnings in Wisconsin, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.