Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 48, NWS Twin Cities, MN

July 6, 2021Eau Claire County, Wisconsin

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 6, 2021, 3:20 PM CDT for Eau Claire County, Wisconsin. It was in force for 10 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: Jul 6, 2021, 3:20 PM CDT (20:20 UTC)
Expired: Jul 6, 2021, 3:30 PM CDT
In force: 10 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Eau Claire County, WI

The radar

The La Crosse radar (KARX), 99 km from the middle of the area, began a volume at 20:22 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
Jul 6, 2:01 PM CDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 8.3 hours before the alert went out and 206 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: 214 J/kg
Mixed-layer CIN: -106 J/kg
Mixed-layer LCL: 1752 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 17 m²/s²
0-3 km storm-relative helicity: 42 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

The text

As transmitted.

603 
WUUS53 KMPX 062020
SVRMPX
WIC035-062030-
/O.NEW.KMPX.SV.W.0048.210706T2020Z-210706T2030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Twin Cities/Chanhassen MN
320 PM CDT Tue Jul 6 2021

The National Weather Service in the Twin Cities has issued a

* Severe Thunderstorm Warning for...
  Eastern Eau Claire County in west central Wisconsin...

* Until 330 PM CDT.

* At 320 PM CDT, severe thunderstorms were located along a line
  extending from 8 miles south of Stanley to 8 miles southwest of
  Humbird, moving east at 40 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* These severe thunderstorms will remain over mainly rural areas of
  eastern Eau Claire County, including the following locations...
  Lake Eau Claire County Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4460 9093 4460 9116 4486 9110 4486 9092
      4470 9092
TIME...MOT...LOC 2020Z 284DEG 35KT 4484 9097 4445 9102 

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

NDC

1 follow-up statement

044 
WWUS53 KMPX 062029
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
329 PM CDT Tue Jul 6 2021

WIC035-062039-
/O.EXP.KMPX.SV.W.0048.000000T0000Z-210706T2030Z/
Eau Claire WI-
329 PM CDT Tue Jul 6 2021

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN EAU CLAIRE COUNTY WILL
EXPIRE AT 330 PM CDT...
    
The storms which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire.

A Severe Thunderstorm Watch remains in effect until 1000 PM CDT for
west central Wisconsin.

LAT...LON 4460 9093 4460 9116 4486 9110 4486 9092
      4470 9092
TIME...MOT...LOC 2029Z 284DEG 35KT 4482 9087 4443 9092 

$$

NDC

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 6, 2:49 PM CDT	Special Weather Statement	MPX	Eau Claire	41 min
Jul 6, 6:10 PM CDT	Special Weather Statement	MPX	Pepin	35 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.