Alert archive / Minnesota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 139, NWS Twin Cities, MN

December 15, 2021Blue Earth County, Le Sueur County, Waseca County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Dec 15, 2021, 7:07 PM CST for Blue Earth County, Le Sueur County, Waseca County, Minnesota. It was in force for 38 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: Dec 15, 2021, 7:07 PM CST (01:07 UTC)
Expired: Dec 15, 2021, 7:45 PM CST
In force: 38 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

Counties Blue Earth County, MN, Le Sueur County, MN, Waseca County, MN

The radar

The Minneapolis radar (KMPX), 77 km from the middle of the area, began a volume at 01:10 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Dec 15, 1:23 PM CST	Tornado Watch	SPC	7 hr
Dec 15, 5:30 PM CST	Tornado Watch	SPC	6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 1.1 hours before the alert went out and 77 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: 633 J/kg
Mixed-layer CIN: -55 J/kg
Mixed-layer LCL: 770 m above ground
0-6 km bulk shear: 75 kt
0-1 km storm-relative helicity: 443 m²/s²
0-3 km storm-relative helicity: 470 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 5.7

Open this sounding in Storm Lab

The text

As transmitted.

877 
WUUS53 KMPX 160107
SVRMPX
MNC013-079-161-160145-
/O.NEW.KMPX.SV.W.0139.211216T0107Z-211216T0145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Twin Cities/Chanhassen MN
707 PM CST Wed Dec 15 2021

The National Weather Service in the Twin Cities has issued a

* Severe Thunderstorm Warning for...
  Le Sueur County in south central Minnesota...
  Northeastern Blue Earth County in south central Minnesota...
  Waseca County in south central Minnesota...

* Until 745 PM CST.

* At 707 PM CST, severe thunderstorms were located along a line
  extending from near Kasota to St. Clair to near Freeborn, moving
  north at 60 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Severe thunderstorms will be near...
  North Mankato, St. Peter, Eagle Lake, Janesville and St. Clair 
  around 710 PM CST.
  Madison Lake and Elysian around 715 PM CST.
  New Richland and Cleveland around 720 PM CST.
  Le Center around 725 PM CST.

Other locations in the path of these severe thunderstorms include
Waseca.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 800 PM CST for south central
Minnesota. A Tornado Watch also remains in effect until 1100 PM CST
for south central Minnesota.

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

A Tornado Watch remains in effect until 800 PM CST for south central
Minnesota. A Tornado Watch also remains in effect until 1100 PM CST
for south central Minnesota.

&&

LAT...LON 4385 9377 4400 9390 4416 9408 4417 9401
      4424 9403 4434 9393 4436 9395 4442 9391
      4441 9359 4432 9352 4420 9352 4419 9340
      4385 9341
TIME...MOT...LOC 0107Z 198DEG 53KT 4425 9404 4410 9385 4372 9357 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Dye

3 follow-up statements

643 
WWUS53 KMPX 160120
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
720 PM CST Wed Dec 15 2021

MNC013-160130-
/O.CAN.KMPX.SV.W.0139.000000T0000Z-211216T0145Z/
Blue Earth MN-
720 PM CST Wed Dec 15 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN BLUE EARTH COUNTY
IS CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

A Tornado Watch remains in effect until 800 PM CST for south central
Minnesota. A Tornado Watch also remains in effect until 1100 PM CST
for south central Minnesota.

LAT...LON 4385 9377 4423 9377 4424 9403 4425 9401
      4434 9393 4436 9395 4442 9391 4441 9359
      4432 9352 4420 9352 4419 9341 4385 9341
TIME...MOT...LOC 0120Z 198DEG 53KT 4439 9398 4424 9379 4386 9351 

$$

MNC079-161-160145-
/O.CON.KMPX.SV.W.0139.000000T0000Z-211216T0145Z/
Le Sueur MN-Waseca MN-
720 PM CST Wed Dec 15 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM CST
FOR LE SUEUR AND WASECA COUNTIES...

At 720 PM CST, severe thunderstorms were located along a line
extending from near St. Peter to near Madison Lake to near New
Richland, moving north at 60 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

These severe storms will be near...
  Cleveland around 725 PM CST.

Other locations in the path of these severe thunderstorms include Le
Center and Waseca.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 800 PM CST for south central
Minnesota. A Tornado Watch also remains in effect until 1100 PM CST
for south central Minnesota.

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

&&

LAT...LON 4385 9377 4423 9377 4424 9403 4425 9401
      4434 9393 4436 9395 4442 9391 4441 9359
      4432 9352 4420 9352 4419 9341 4385 9341
TIME...MOT...LOC 0120Z 198DEG 53KT 4439 9398 4424 9379 4386 9351 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Dye

419 
WWUS53 KMPX 160126
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
726 PM CST Wed Dec 15 2021

MNC079-161-160145-
/O.CON.KMPX.SV.W.0139.000000T0000Z-211216T0145Z/
Le Sueur MN-Waseca MN-
726 PM CST Wed Dec 15 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM CST
FOR SOUTHEASTERN LE SUEUR AND NORTHEASTERN WASECA COUNTIES...

At 725 PM CST, severe thunderstorms were located along a line
extending from near Le Sueur to near Cleveland to New Richland,
moving north at 60 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

These severe storms will be near...
  Le Center and Cleveland around 730 PM CST.
  Waseca around 735 PM CST.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 800 PM CST for south central
Minnesota. A Tornado Watch also remains in effect until 1100 PM CST
for south central Minnesota.

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

&&

LAT...LON 4423 9377 4442 9391 4441 9359 4432 9352
      4420 9352 4419 9341 4385 9341
TIME...MOT...LOC 0125Z 198DEG 53KT 4444 9396 4429 9377 4391 9349 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Dye

010 
WWUS53 KMPX 160138
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
738 PM CST Wed Dec 15 2021

MNC079-161-160146-
/O.EXP.KMPX.SV.W.0139.000000T0000Z-211216T0145Z/
Le Sueur MN-Waseca MN-
738 PM CST Wed Dec 15 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN LE SUEUR AND
NORTHEASTERN WASECA COUNTIES WILL EXPIRE AT 745 PM CST...
    
The storms which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire.  However gusty
winds are still possible with these thunderstorms.

A Tornado Watch remains in effect until 800 PM CST for south central
Minnesota. A Tornado Watch also remains in effect until 1100 PM CST
for south central Minnesota.

LAT...LON 4423 9377 4442 9391 4441 9359 4432 9352
      4420 9352 4419 9341 4385 9341
TIME...MOT...LOC 0136Z 198DEG 53KT 4455 9391 4440 9372 4402 9344 

$$

Dye

The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 15, 6:40 PM CST	Severe Thunderstorm Warning	MPX	Faribault, Freeborn	50 min
Dec 15, 6:55 PM CST	Tornado Warning	MPX	Faribault, Freeborn	35 min
Dec 15, 7:18 PM CST	Severe Thunderstorm Warning	MPX	Rice, Steele	42 min
Dec 15, 7:48 PM CST	Severe Thunderstorm Warning	MPX	Dakota, Goodhue, Rice	30 min

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.