Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 18, NWS Twin Cities, MN

May 15, 2021Pepin County, Pierce County, Wisconsin

NWS Twin Cities, MN issued this severe thunderstorm warning at May 15, 2021, 6:28 PM CDT for Pepin County, Pierce County, Wisconsin. It was in force for 62 min. 1 report 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: May 15, 2021, 6:28 PM CDT (23:28 UTC)
Expired: May 15, 2021, 7:30 PM CDT
In force: 62 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

Counties Pepin County, WI, Pierce County, WI

The radar

The Minneapolis radar (KMPX), 112 km from the middle of the area, began a volume at 23:28 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
May 15, 7:08 PM CDT	HAIL 1	Pepin, WI	DIME TO QUARTER SIZE.

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 12:00Z, 11.5 hours before the alert went out and 115 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 894 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 57 m²/s²
0-3 km storm-relative helicity: 120 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

350 
WUUS53 KMPX 152328
SVRMPX
WIC091-093-160030-
/O.NEW.KMPX.SV.W.0018.210515T2328Z-210516T0030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Twin Cities/Chanhassen MN
628 PM CDT Sat May 15 2021

The National Weather Service in the Twin Cities has issued a

* Severe Thunderstorm Warning for...
  Western Pepin County in west central Wisconsin...
  Southeastern Pierce County in west central Wisconsin...

* Until 730 PM CDT.

* At 627 PM CDT, a severe thunderstorm was located near Plum City, or
  17 miles northeast of Red Wing, moving south at 20 mph.

  HAZARD...60 mph wind gusts and half dollar 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...
  Plum City around 640 PM CDT.

Other locations in the path of this severe thunderstorm include
Stockholm and Pepin.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

This storm is producing large hail. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows!

If boating on a lake or river, get away from the water and move 
indoors or inside a vehicle. Remember, lightning can strike out to 
15 miles from the parent thunderstorm. If you can hear thunder, you 
are close enough to be struck by lightning. Move to safe shelter 
now!  Do not be caught on the water in a thunderstorm.

&&

LAT...LON 4442 9212 4445 9223 4450 9231 4454 9231
      4456 9235 4472 9246 4470 9214 4455 9204
      4441 9209
TIME...MOT...LOC 2327Z 340DEG 16KT 4468 9224 

HAIL...1.25IN
WIND...60MPH
 
$$

ETA

2 follow-up statements

124 
WWUS53 KMPX 160008
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
708 PM CDT Sat May 15 2021

WIC093-160017-
/O.CAN.KMPX.SV.W.0018.000000T0000Z-210516T0030Z/
Pierce WI-
708 PM CDT Sat May 15 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN PIERCE COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 4450 9231 4454 9231 4454 9214 4451 9205
      4441 9209 4442 9212 4445 9223
TIME...MOT...LOC 0007Z 340DEG 16KT 4451 9215 

$$

WIC091-160030-
/O.CON.KMPX.SV.W.0018.000000T0000Z-210516T0030Z/
Pepin WI-
708 PM CDT Sat May 15 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM CDT
FOR SOUTHWESTERN PEPIN COUNTY...

At 707 PM CDT, a severe thunderstorm was located near Pepin, or 11
miles northwest of Wabasha, moving south at 20 mph.

HAZARD...60 mph wind gusts and half dollar size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
  Pepin.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

This storm is producing large hail. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows.

If boating on a lake or river, get away from the water and move 
indoors or inside a vehicle. remember, lightning can strike out to 
15 miles from the parent thunderstorm. If you can hear thunder, you 
are close enough to be struck by lightning. Move to safe shelter 
now!  Do not be caught on the water in a thunderstorm.

&&

LAT...LON 4450 9231 4454 9231 4454 9214 4451 9205
      4441 9209 4442 9212 4445 9223
TIME...MOT...LOC 0007Z 340DEG 16KT 4451 9215 

HAIL...1.25IN
WIND...60MPH
 
$$

ETA

610 
WWUS53 KMPX 160023
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
723 PM CDT Sat May 15 2021

WIC091-160033-
/O.EXP.KMPX.SV.W.0018.000000T0000Z-210516T0030Z/
Pepin WI-
723 PM CDT Sat May 15 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN PEPIN COUNTY WILL
EXPIRE AT 730 PM CDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

LAT...LON 4450 9231 4454 9231 4454 9214 4451 9205
      4441 9209 4442 9212 4445 9223
TIME...MOT...LOC 0023Z 340DEG 16KT 4445 9212 

$$

ETA

The office that day

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

Issued	Product	Office	Counties	Lasted
May 15, 3:48 PM CDT	Special Weather Statement	MPX	Polk	27 min
May 15, 4:07 PM CDT	Severe Thunderstorm Warning	MPX	Polk	23 min
May 15, 4:29 PM CDT	Severe Thunderstorm Warning	MPX	Polk	22 min
May 15, 4:50 PM CDT	Special Weather Statement	MPX	Saint Croix	40 min
May 15, 5:07 PM CDT	Severe Thunderstorm Warning	MPX	Saint Croix	23 min
May 15, 5:27 PM CDT	Severe Thunderstorm Warning	MPX	Saint Croix	33 min
May 15, 5:44 PM CDT	Severe Thunderstorm Warning	MPX	Pierce	46 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 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.