Alert archive / Minnesota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 36, NWS Twin Cities, MN

June 17, 2021Dakota County, Goodhue County, Rice County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jun 17, 2021, 7:02 PM CDT for Dakota County, Goodhue County, Rice County, Minnesota. It was in force for 58 min. 18 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: Jun 17, 2021, 7:02 PM CDT (00:02 UTC)
Expired: Jun 17, 2021, 8:00 PM CDT
In force: 58 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 2.5 in
Wind: 60.0 mph

Counties Dakota County, MN, Goodhue County, MN, Rice County, MN

The radar

The Minneapolis radar (KMPX), 49 km from the middle of the area, began a volume at 00:00 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
Jun 17, 7:19 PM CDT	TSTM WND GST 61	1 N Northfield, MN	MEASURED WITH HANDHELD ANEMOMETER. DAMAGE NOT YET NOTED AT TIME OF REPORT.
Jun 17, 7:20 PM CDT	HAIL 2.75	3 E Northfield, MN	HAIL WAS PHOTOGRAPHED.
Jun 17, 7:26 PM CDT	HAIL 1	3 Sw Lakeville, MN
Jun 17, 7:30 PM CDT	HAIL 0.88	3 Wnw Farmington, MN	SOCIAL MEDIA.
Jun 17, 7:30 PM CDT	HAIL 2	1 S Cannon Falls, MN	PICTURE ON SOCIAL MEDIA. TIME ESTIMATED FROM RADAR.
Jun 17, 7:30 PM CDT	HAIL 3	3 Wsw Cannon Falls, MN	HAIL WAS MEASURED AT 3 INCHES IN DIAMETER 15 MINUTES AFTER IT FELL. ALSO PHOTOGRAPHED.
Jun 17, 7:33 PM CDT	HAIL 2	4 Ssw Randolph, MN	HAILED FOR THREE MINUTES. MOST HAIL WAS 1.75 INCHES WITH THE LARGEST BEING MEASURED AT 2 INCHES.
Jun 17, 7:35 PM CDT	HAIL 1	4 Ene Dennison, MN
Jun 17, 7:35 PM CDT	HAIL 1	Cannon Falls, MN	PICTURE OF MEASURED 1 INCH HAIL ON SOCIAL MEDIA. TIME ESTIMATED FROM RADAR.
Jun 17, 7:35 PM CDT	HAIL 1.5	1 Se Cannon Falls, MN
Jun 17, 7:35 PM CDT	HAIL 3	3 Ssw Cannon Falls, MN	BUILDINGS AND VEHICLES DAMAGED.
Jun 17, 7:37 PM CDT	HAIL 1.5	5 Ne Dennison, MN
Jun 17, 7:37 PM CDT	HAIL 1.5	5 Ssw Cannon Falls, MN
Jun 17, 7:37 PM CDT	HAIL 2	5 N Dennison, MN	TREE LIMBS ALSO DOWN.
Jun 17, 7:40 PM CDT	HAIL 2.75	5 Se Cannon Falls, MN	ALONG CR 25. HAIL WAS PHOTOGRAPHED WITH A BASEBALL.
Jun 17, 7:51 PM CDT	HAIL 2.75	4 S Randolph, MN	BRANCHES ALSO DOWN.
Jun 17, 7:55 PM CDT	HAIL 1.25	2 Nne Northfield, MN	HAIL WAS PHOTOGRAPHED NEXT TO A QUARTER.
Jun 17, 8:08 PM CDT	HAIL 1.75	3 S Randolph, MN	PICTURE ON SOCIAL MEDIA. TIME ESTIMATED FROM RADAR.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 0.0 hours before the alert went out and 51 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 61 J/kg
Mixed-layer CIN: -387 J/kg
Mixed-layer LCL: 1555 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: -13 m²/s²
0-3 km storm-relative helicity: 56 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

485 
WUUS53 KMPX 180002
SVRMPX
MNC037-049-131-180100-
/O.NEW.KMPX.SV.W.0036.210618T0002Z-210618T0100Z/

BULLETIN - EAS ACTIVATION REQUESTED
Severe Thunderstorm Warning
National Weather Service Twin Cities/Chanhassen MN
702 PM CDT Thu Jun 17 2021

The National Weather Service in the Twin Cities has issued a

* Severe Thunderstorm Warning for...
  Dakota County in east central Minnesota...
  Northwestern Goodhue County in southeastern Minnesota...
  Northeastern Rice County in south central Minnesota...

* Until 800 PM CDT.

* At 702 PM CDT, a severe thunderstorm was located over Webster, or
  11 miles northwest of Northfield, moving east at 40 mph.

  HAZARD...Tennis ball size hail and 60 mph wind gusts.

  SOURCE...Trained weather spotters.

  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 thunderstorm will be near...
  Northfield and Farmington around 720 PM CDT.

Other locations in the path of this severe thunderstorm include
Stanton, Cannon Falls and Welch.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4463 9328 4464 9331 4467 9332 4475 9282
      4472 9274 4466 9265 4443 9267 4441 9328
TIME...MOT...LOC 0002Z 260DEG 37KT 4453 9338 

HAIL...2.50IN
WIND...60MPH
 
$$

Borghoff

2 follow-up statements

209 
WWUS53 KMPX 180020
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
720 PM CDT Thu Jun 17 2021

MNC037-049-131-180100-
/O.CON.KMPX.SV.W.0036.000000T0000Z-210618T0100Z/
Dakota MN-Goodhue MN-Rice MN-
720 PM CDT Thu Jun 17 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM CDT
FOR DAKOTA...NORTHWESTERN GOODHUE AND NORTHEASTERN RICE COUNTIES...

At 719 PM CDT, severe thunderstorms were located along a line
extending from near Farmington to near Northfield, moving east at 40
mph.

HAZARD...Tennis ball size hail and 60 mph wind gusts.

SOURCE...Trained weather spotters.

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.

These severe storms will be near...
  Stanton around 730 PM CDT.
  Cannon Falls around 735 PM CDT.
  Welch around 755 PM CDT.

Other locations impacted by these severe thunderstorms include Vasa,
Coates, Vermillion, Castle Rock, Lakeville Airport, Miesville,
Hampton, Lake Byllesby, Randolph and New Trier.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

These are dangerous storms. Prepare immediately for large destructive
hail capable of producing significant damage. People outside should
move to a shelter, inside a strong building and away from windows.

&&

LAT...LON 4463 9328 4464 9331 4467 9332 4475 9282
      4472 9274 4466 9265 4443 9267 4441 9321
      4454 9328
TIME...MOT...LOC 0019Z 262DEG 35KT 4461 9320 4447 9313 

HAIL...2.50IN
WIND...60MPH
 
$$

Borghoff

145 
WWUS53 KMPX 180030
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
730 PM CDT Thu Jun 17 2021

MNC131-180040-
/O.CAN.KMPX.SV.W.0036.000000T0000Z-210618T0100Z/
Rice MN-
730 PM CDT Thu Jun 17 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN RICE 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 100 AM CDT for
south central, southeastern and east central Minnesota...and west
central Wisconsin.

LAT...LON 4447 9305 4447 9324 4454 9328 4463 9328
      4464 9331 4467 9332 4475 9282 4472 9274
      4466 9265 4443 9267 4442 9304
TIME...MOT...LOC 0030Z 256DEG 39KT 4463 9321 4458 9301 4449 9299 

$$

MNC037-049-180100-
/O.CON.KMPX.SV.W.0036.000000T0000Z-210618T0100Z/
Dakota MN-Goodhue MN-
730 PM CDT Thu Jun 17 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM CDT
FOR DAKOTA AND NORTHWESTERN GOODHUE COUNTIES...

At 730 PM CDT, severe thunderstorms were located along a line
extending from near Farmington to 7 miles northwest of Cannon Falls
to Stanton, moving east at 45 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.

These severe storms will be near...
  Cannon Falls around 735 PM CDT.
  Welch around 750 PM CDT.
  Hastings around 755 PM CDT.

Other locations impacted by these severe thunderstorms include Vasa,
Coates, Vermillion, Castle Rock, Lakeville Airport, Miesville,
Hampton, Lake Byllesby, Randolph and New Trier.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

These storms are producing large hail. SEEK SHELTER NOW inside a
sturdy structure and stay away from windows.

&&

LAT...LON 4447 9305 4447 9324 4454 9328 4463 9328
      4464 9331 4467 9332 4475 9282 4472 9274
      4466 9265 4443 9267 4442 9304
TIME...MOT...LOC 0030Z 256DEG 39KT 4463 9321 4458 9301 4449 9299 

HAIL...1.50IN
WIND...60MPH
 
$$

Borghoff

The office that day

Everything else NWS Twin Cities, MN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 17, 7:06 PM CDT	Severe Thunderstorm Warning	MPX	Carver, Scott, Sibley	42 min
Jun 17, 7:41 PM CDT	Severe Thunderstorm Warning	MPX	Nicollet, Sibley	26 min
Jun 17, 7:44 PM CDT	Severe Thunderstorm Warning	MPX	Goodhue	32 min
Jun 17, 7:50 PM CDT	Severe Thunderstorm Warning	MPX	Goodhue	55 min
Jun 17, 8:00 PM CDT	Severe Thunderstorm Warning	MPX	Dakota, Goodhue	45 min
Jun 17, 8:28 PM CDT	Severe Thunderstorm Warning	MPX	Goodhue	34 min
Jun 18, 3:21 AM CDT	Red Flag Warning	MPX	Anoka, Benton, Carver, Chippewa, Chisago, Douglas and 20 more	16 hr

Nearby

Severe Thunderstorm Warnings in Minnesota, 2021 Every 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.