Alert archive / Minnesota / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 129, NWS Twin Cities, MN
NWS Twin Cities, MN issued this severe thunderstorm warning at Sep 17, 2021, 2:59 AM CDT for 6 counties in Minnesota. It was in force for 16 min. 14 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
- Sep 17, 2021, 2:59 AM CDT (07:59 UTC)
- Expired
- Sep 17, 2021, 3:15 AM CDT
- In force
- 16 min
- Issued by
- NWS Twin Cities, MN
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Anoka County, MN, Dakota County, MN, Hennepin County, MN, Ramsey County, MN, Scott County, MN, Washington County, MN
The radar
The Minneapolis radar (KMPX), 41 km from the middle of the area, began a volume at 08:02 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 17, 3:00 AM CDT | TSTM WND DMG | Savage, MN | PHONED IN REPORT OF DAMAGE TO BUILDINGS AND POWER INFRASTRUCTURE, WITH LARGE AMOUNTS OF DEBRIS SCATTERED AROUND. LARGE PORTION OF CITY WITHOUT POWER. TIME ESTIMATED BY RADAR. |
| Sep 17, 3:00 AM CDT | TORNADO | 1 W Savage, MN | A TORNADO TOUCHED DOWN NEAR HIGHWAY 13 AND CONNELLY PKWY AND MOVED EAST FOR 2.1 MILES. MAX WINDS ESTIMATED AT 85 MPH. RATED EF0. MOST DAMAGE WAS DUE TO TREES FALLING ON HOUSES AND VEHICLES. ROOF DAMAGE OCCURRED AT SAVAGE PUBLIC WORKS AND A LIGHT STANDARD WAS B |
| Sep 17, 3:04 AM CDT | TSTM WND DMG | Bloomington, MN | LARGE TREE, GREATER THAN 1 FOOT IN DIAMETER, DOWN. TIME ESTIMATED FROM RADAR. |
| Sep 17, 3:06 AM CDT | TSTM WND DMG | 1 S Burnsville, MN | TIME ESTIMATED FROM RADAR. MULTIPLE TREES UPROOTED. |
| Sep 17, 3:06 AM CDT | TSTM WND DMG | 4 Ne Burnsville, MN | TIME ESTIMATED. MULTIPLE TREES DOWN. |
| Sep 17, 3:06 AM CDT | TSTM WND DMG | Burnsville, MN | TIME ESTIMATED FROM RADAR. LARGE TREE UPROOTED. |
| Sep 17, 3:06 AM CDT | TSTM WND DMG | Richfield, MN | MULTIPLE TREES DOWN/UPROOTED IN RICHFIELD. TIME ESTIMATED. |
| Sep 17, 3:08 AM CDT | TSTM WND DMG | 4 S Eagan, MN | 4-6 INCH TREE LIMBS DOWN OVER ROADWAYS. PICTURE VIA TWITTER. TIME ESTIMATED VIA RADAR. |
| Sep 17, 3:08 AM CDT | TORNADO | 3 Ne Burnsville, MN | A TORNADO TOUCHED DOWN NEAR HIGHWAY 13 AND CLIFF RD IN NORTHEAST BURNSVILLE. IT WAS ON THE GROUND FOR 1 MILE AND WAS RATED EF0. MOST DAMAGE WAS DUE TO TREES FALLING ON HOUSES AND VEHICLES. |
| Sep 17, 3:09 AM CDT | TSTM WND GST 64 | 3 E Richfield, MN | 64MPH WIND GUST MEASURED AT MSP INTERNATIONAL AIRPORT. |
| Sep 17, 3:11 AM CDT | TSTM WND DMG | Eagan, MN | MULTIPLE TREES DOWN/UPROOTED IN EAGAN. TIME ESTIMATED FROM RADAR. |
| Sep 17, 3:13 AM CDT | TSTM WND DMG | 4 Nnw Rosemount, MN | 3 LARGE TREES UPROOTED. TIME ESTIMATED FROM RADAR. |
| Sep 17, 3:13 AM CDT | TSTM WND DMG | 4 S Eagan, MN | TIME ESTIMATED FROM RADAR. NUMEROUS LARGE TREES DOWN. ONE ON THE FRONT OF A HOUSE AND ONE ON TOP OF TWO CARS. |
| Sep 17, 3:15 AM CDT | TSTM WND DMG | 1 S Savage, MN | SMALL TREE LIMBS DOWN, HOME WEATHER STATION RECORDED 58MPH GUST. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
International Fa, MN (KINL), launched 00:00Z, 8.0 hours before the alert went out and 397 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
- 832 m above ground
- 0-6 km bulk shear
- 75 kt
- 0-1 km storm-relative helicity
- -33 m²/s²
- 0-3 km storm-relative helicity
- 175 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.6
The text
As transmitted.
592
WUUS53 KMPX 170759
SVRMPX
MNC003-037-053-123-139-163-170815-
/O.NEW.KMPX.SV.W.0129.210917T0759Z-210917T0815Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Twin Cities/Chanhassen MN
259 AM CDT Fri Sep 17 2021
The National Weather Service in the Twin Cities has issued a
* Severe Thunderstorm Warning for...
Eastern Hennepin County in east central Minnesota...
Northwestern Dakota County in east central Minnesota...
Northeastern Scott County in east central Minnesota...
Southeastern Anoka County in east central Minnesota...
Western Washington County in east central Minnesota...
Ramsey County in east central Minnesota...
* Until 315 AM CDT.
* At 259 AM CDT, severe thunderstorms were located along a line
extending from Brooklyn Park to Shakopee, moving northeast at 60
mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Severe thunderstorms will be near...
Minneapolis, Brooklyn Park, Coon Rapids, Roseville and Brooklyn
Center around 305 AM CDT.
Apple Valley, Shoreview, New Brighton, Arden Hills and MSP
International Airport around 310 AM CDT.
Bloomington, Eagan, Blaine, Inver Grove Heights and Rosemount
around 315 AM CDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4481 9290 4467 9352 4514 9342 4530 9295
4529 9288
TIME...MOT...LOC 0759Z 245DEG 51KT 4509 9337 4476 9345
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
TDH1 follow-up statement
991
WWUS53 KMPX 170808
SVSMPX
Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
308 AM CDT Fri Sep 17 2021
MNC139-170818-
/O.CAN.KMPX.SV.W.0129.000000T0000Z-210917T0815Z/
Scott MN-
308 AM CDT Fri Sep 17 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN SCOTT COUNTY IS
CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
LAT...LON 4472 9328 4522 9319 4530 9295 4529 9288
4481 9290
TIME...MOT...LOC 0808Z 247DEG 57KT 4513 9319 4481 9326
$$
MNC003-037-053-123-163-170815-
/O.CON.KMPX.SV.W.0129.000000T0000Z-210917T0815Z/
Hennepin MN-Dakota MN-Anoka MN-Washington MN-Ramsey MN-
308 AM CDT Fri Sep 17 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 315 AM CDT
FOR SOUTHEASTERN HENNEPIN...NORTHWESTERN DAKOTA...EAST CENTRAL
ANOKA...WESTERN WASHINGTON AND RAMSEY COUNTIES...
At 308 AM CDT, severe thunderstorms were located along a line
extending from near Mounds View to near Burnsville, moving northeast
at 65 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
These severe storms will be near...
Lino Lakes, Hugo, Vadnais Heights and Mahtomedi around 315 AM CDT.
Other locations in the path of these severe thunderstorms include
Cottage Grove, Forest Lake, St. Paul Park, Woodbury and Lake Elmo.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4472 9328 4522 9319 4530 9295 4529 9288
4481 9290
TIME...MOT...LOC 0808Z 247DEG 57KT 4513 9319 4481 9326
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
TDHThe office that day
Everything else NWS Twin Cities, MN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 16, 7:07 PM CDT | Tornado Warning | MPX | Mille Lacs, Morrison | 23 min |
| Sep 16, 7:08 PM CDT | Severe Thunderstorm Warning | MPX | Chippewa, Kandiyohi | 37 min |
| Sep 16, 7:14 PM CDT | Special Weather Statement | MPX | Chippewa | 31 min |
| Sep 16, 7:18 PM CDT | Severe Thunderstorm Warning | MPX | Chippewa, Kandiyohi, Renville | 27 min |
| Sep 16, 7:30 PM CDT | Severe Thunderstorm Warning | MPX | Kanabec, Mille Lacs, Morrison | 45 min |
| Sep 16, 7:43 PM CDT | Special Weather Statement | MPX | Mille Lacs | 47 min |
| Sep 16, 7:44 PM CDT | Severe Thunderstorm Warning | MPX | Kandiyohi, Renville | 31 min |
| Sep 16, 7:47 PM CDT | Special Weather Statement | MPX | Meeker | 28 min |
| Sep 16, 7:53 PM CDT | Severe Thunderstorm Warning | MPX | Mille Lacs | 37 min |
| Sep 16, 8:12 PM CDT | Severe Thunderstorm Warning | MPX | Kandiyohi, McLeod, Meeker, Renville | 33 min |
| Sep 16, 8:38 PM CDT | Special Weather Statement | MPX | Isanti | 37 min |
| Sep 16, 8:45 PM CDT | Severe Thunderstorm Warning | MPX | McLeod, Meeker, Wright | 30 min |
| Sep 16, 9:12 PM CDT | Special Weather Statement | MPX | Hennepin | 33 min |
| Sep 16, 10:24 PM CDT | Special Weather Statement | MPX | Lac qui Parle | 36 min |
| Sep 16, 10:37 PM CDT | Special Weather Statement | MPX | Kanabec | 23 min |
| Sep 16, 11:06 PM CDT | Special Weather Statement | MPX | Stearns | 24 min |
| Sep 17, 12:09 AM CDT | Special Weather Statement | MPX | Mille Lacs | 36 min |
| Sep 17, 12:21 AM CDT | Special Weather Statement | MPX | Benton | 24 min |
| Sep 17, 12:47 AM CDT | Special Weather Statement | MPX | Mille Lacs | 28 min |
| Sep 17, 12:55 AM CDT | Special Weather Statement | MPX | Redwood, Yellow Medicine | 35 min |
| Sep 17, 1:10 AM CDT | Special Weather Statement | MPX | Kanabec | 20 min |
| Sep 17, 1:20 AM CDT | Special Weather Statement | MPX | Benton | 25 min |
| Sep 17, 1:29 AM CDT | Severe Thunderstorm Warning | MPX | Brown, Redwood, Renville | 31 min |
| Sep 17, 1:48 AM CDT | Special Weather Statement | MPX | Kanabec, Mille Lacs | 27 min |
| Sep 17, 1:53 AM CDT | Special Weather Statement | MPX | McLeod, Sibley | 37 min |
| Sep 17, 2:00 AM CDT | Special Weather Statement | MPX | Brown, Nicollet | 30 min |
| Sep 17, 2:29 AM CDT | Severe Thunderstorm Warning | MPX | Carver, McLeod, Scott, Sibley | 16 min |
| Sep 17, 2:34 AM CDT | Special Weather Statement | MPX | Le Sueur, Rice | 26 min |
| Sep 17, 2:45 AM CDT | Severe Thunderstorm Warning | MPX | Carver, Hennepin, Scott | 15 min |
| Sep 17, 3:15 AM CDT | Severe Thunderstorm Warning | MPX | Washington | 15 min |
| Sep 17, 3:18 AM CDT | Special Weather Statement | MPX | Goodhue | 27 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.