Alert archive / Minnesota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 44, NWS La Crosse, WI

June 20, 2021Olmsted County, Winona County, Minnesota

NWS La Crosse, WI issued this severe thunderstorm warning at Jun 20, 2021, 4:38 PM CDT for Olmsted County, Winona County, Minnesota. It was in force for 26 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
Jun 20, 2021, 4:38 PM CDT (21:38 UTC)
Expired
Jun 20, 2021, 5:04 PM CDT
In force
26 min
Issued by
NWS La Crosse, WI
Area
Storm-based polygon
Tornado
Possible
Hail
0.75 in
Wind
60.0 mph

Counties Olmsted County, MN, Winona County, MN

The radar

The La Crosse radar (KARX), 59 km from the middle of the area, began a volume at 21:38 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.

IssuedProductOfficeLasted
Jun 20, 1:42 PM CDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 9.6 hours before the alert went out and 164 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-pSkew-T log-p diagram, Minneapolis, MN at 12:00Z on 2021-06-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 12:00Z on 2021-06-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 12 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1666 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
12 m²/s²
0-3 km storm-relative helicity
52 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

879 
WUUS53 KARX 202138
SVRARX
MNC109-169-202230-
/O.NEW.KARX.SV.W.0044.210620T2138Z-210620T2230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service La Crosse WI
438 PM CDT Sun Jun 20 2021

The National Weather Service in La Crosse has issued a

* Severe Thunderstorm Warning for...
  Winona County in southeastern Minnesota...
  Southeastern Olmsted County in southeastern Minnesota...

* Until 530 PM CDT.

* At 438 PM CDT, severe thunderstorms were located along a line
  extending from 7 miles northwest of Altura to near St. Charles to
  Chatfield, moving east at 25 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Severe thunderstorms will be near...
  Altura around 455 PM CDT.
  Lewiston and Rollingstone around 500 PM CDT.
  Fountain City and Stockton around 510 PM CDT.
  Winona and Goodview around 515 PM CDT.

Other locations impacted by these severe thunderstorms include
Saratoga, Whitewater State Park, County Roads 9 And 10, County Roads
6 And 33, Elba, Wyattville and Wilson.

This includes Interstate 90 in Minnesota between mile markers 228 and
261.
 
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 4411 9211 4411 9208 4419 9208 4419 9186
      4416 9180 4413 9173 4410 9171 4410 9168
      4407 9166 4403 9159 4402 9155 4385 9155
      4385 9221
TIME...MOT...LOC 2138Z 270DEG 24KT 4416 9201 4401 9208 4383 9217 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH
 
$$

Wetenkamp
2 follow-up statements
829 
WWUS53 KARX 202152
SVSARX

Severe Weather Statement
National Weather Service La Crosse WI
452 PM CDT Sun Jun 20 2021

MNC109-202201-
/O.CAN.KARX.SV.W.0044.000000T0000Z-210620T2230Z/
Olmsted MN-
452 PM CDT Sun Jun 20 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN OLMSTED COUNTY IS
CANCELLED...

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

A Severe Thunderstorm Watch remains in effect until 900 PM CDT for
southeastern Minnesota...and west central Wisconsin.

LAT...LON 4405 9208 4412 9204 4419 9202 4419 9186
      4416 9180 4413 9173 4410 9171 4410 9168
      4407 9166 4403 9159 4402 9155 4385 9155
      4385 9208
TIME...MOT...LOC 2151Z 270DEG 24KT 4416 9190 4401 9197 4383 9206 

$$

MNC169-202230-
/O.CON.KARX.SV.W.0044.000000T0000Z-210620T2230Z/
Winona MN-
452 PM CDT Sun Jun 20 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM CDT
FOR WINONA COUNTY...

At 451 PM CDT, severe thunderstorms were located along a line
extending from near Buffalo to near Altura to 6 miles east of
Chatfield, moving east at 30 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

These severe storms will be near...
  Altura around 455 PM CDT.
  Lewiston and Rollingstone around 500 PM CDT.
  Fountain City and Stockton around 510 PM CDT.
  Winona and Goodview around 520 PM CDT.

Other locations impacted by these severe thunderstorms include
Saratoga, Whitewater State Park, County Roads 6 And 33, Elba,
Wyattville, Wilson and Ridgeway.

This includes Interstate 90 in Minnesota between mile markers 233 and
261.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4405 9208 4412 9204 4419 9202 4419 9186
      4416 9180 4413 9173 4410 9171 4410 9168
      4407 9166 4403 9159 4402 9155 4385 9155
      4385 9208
TIME...MOT...LOC 2151Z 270DEG 24KT 4416 9190 4401 9197 4383 9206 

HAIL...<.75IN
WIND...60MPH
 
$$

Wetenkamp
783 
WWUS53 KARX 202204
SVSARX

Severe Weather Statement
National Weather Service La Crosse WI
504 PM CDT Sun Jun 20 2021

MNC169-202214-
/O.CAN.KARX.SV.W.0044.000000T0000Z-210620T2230Z/
Winona MN-
504 PM CDT Sun Jun 20 2021

...THE SEVERE THUNDERSTORM WARNING FOR WINONA COUNTY IS CANCELLED...
            
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 cancelled.

A Severe Thunderstorm Watch remains in effect until 900 PM CDT for
southeastern Minnesota...and west central Wisconsin.

LAT...LON 4405 9208 4412 9204 4419 9202 4419 9186
      4416 9180 4413 9173 4410 9171 4410 9168
      4407 9166 4403 9159 4402 9155 4385 9155
      4385 9208
TIME...MOT...LOC 2203Z 270DEG 24KT 4416 9179 4401 9186 4383 9195 

$$

Wetenkamp

The office that day

Everything else NWS La Crosse, WI issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 20, 2:34 PM CDTSpecial Weather StatementARXDodge, Mower26 min
Jun 20, 3:15 PM CDTSevere Thunderstorm WarningARXDodge30 min
Jun 20, 3:40 PM CDTSpecial Weather StatementARXMower35 min
Jun 20, 4:07 PM CDTSpecial Weather StatementARXOlmsted, Winona23 min
Jun 20, 6:28 PM CDTSpecial Weather StatementARXWabasha32 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.