Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 3, NWS Milwaukee, WI

June 18, 2021Columbia County, Marquette County, Sauk County, Wisconsin

NWS Milwaukee, WI issued this severe thunderstorm warning at Jun 18, 2021, 12:14 AM CDT for Columbia County, Marquette County, Sauk County, Wisconsin. It was in force for 37 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: Jun 18, 2021, 12:14 AM CDT (05:14 UTC)
Expired: Jun 18, 2021, 12:51 AM CDT
In force: 37 min
Issued by: NWS Milwaukee, WI
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Columbia County, WI, Marquette County, WI, Sauk County, WI

The radar

The Milwaukee radar (KMKX), 108 km from the middle of the area, began a volume at 05:17 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 18, 12:40 AM CDT	TSTM WND GST 60	Lake Delton, WI	ESTIMATED WIND GUST OF 60 MPH AT WILDERNESS RESORT IN WI DELLS. A NUMBER OF TREES WERE REPORTED BLOW DOWN ACROSS THE COUNTY AS WELL.

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

The watch it was issued in

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

Issued	Product	Office	Lasted
Jun 17, 10:01 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 00:00Z, 5.2 hours before the alert went out and 140 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: 52 J/kg
Mixed-layer CIN: -285 J/kg
Mixed-layer LCL: 1895 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 310 m²/s²
0-3 km storm-relative helicity: 397 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted.

242 
WUUS53 KMKX 180514
SVRMKX
WIC021-077-111-180615-
/O.NEW.KMKX.SV.W.0003.210618T0514Z-210618T0615Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Milwaukee/Sullivan WI
1214 AM CDT Fri Jun 18 2021

The National Weather Service in Milwaukee/Sullivan has issued a

* Severe Thunderstorm Warning for...
  Northwestern Columbia County in south central Wisconsin...
  Southern Marquette County in south central Wisconsin...
  Northeastern Sauk County in south central Wisconsin...

* Until 115 AM CDT.

* At 1214 AM CDT, severe thunderstorms were located along a line
  extending from 7 miles south of Dellwood to 6 miles east of
  Wonewoc, moving east at 45 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Baraboo, Portage, Reedsburg, Wisconsin Dells, Lake Wisconsin, Lake
  Delton, Montello, West Baraboo, Packwaukee, Mecan, Oxford,
  Endeavor, La Valle, Glen Oak, Interstate 90/94 Interchange and
  Briggsville.

People attending Butterfest in Reedsburg should seek safe shelter
immediately!

This includes the following Locations Mirror Lake State Park, Pine
Island State Wildlife Area, Kilbourn Dam, Historic Indian Agency
House, French Creek Wildlife Area, and Alliant Energy Portage Power
Plant.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4379 8917 4377 8917 4377 8923 4376 8925
      4364 8925 4364 8924 4338 8951 4359 9014
      4364 9012 4364 8960 4384 8960
TIME...MOT...LOC 0514Z 285DEG 40KT 4387 8994 4363 9010 

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

CMILLER

2 follow-up statements

689 
WWUS53 KMKX 180535
SVSMKX

Severe Weather Statement
National Weather Service Milwaukee/Sullivan WI
1235 AM CDT Fri Jun 18 2021

WIC021-077-111-180615-
/O.CON.KMKX.SV.W.0003.000000T0000Z-210618T0615Z/
Columbia WI-Marquette WI-Sauk WI-
1235 AM CDT Fri Jun 18 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 115 AM CDT
FOR NORTHWESTERN COLUMBIA...SOUTHERN MARQUETTE AND NORTHEASTERN SAUK
COUNTIES...

At 1234 AM CDT, severe thunderstorms were located along a line
extending from 9 miles southwest of Westfield to Lake Delton, moving
east at 45 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Baraboo, Portage, Wisconsin Dells, Lake Wisconsin, Lake Delton,
Montello, West Baraboo, Packwaukee, Mecan, Oxford, Endeavor, Glen
Oak, Interstate 90/94 Interchange and Briggsville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4379 8917 4377 8917 4377 8923 4376 8925
      4364 8925 4364 8924 4338 8951 4353 8994
      4364 8989 4364 8960 4384 8960
TIME...MOT...LOC 0534Z 285DEG 40KT 4381 8965 4357 8982 

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

CMILLER

612 
WWUS53 KMKX 180551
SVSMKX

Severe Weather Statement
National Weather Service Milwaukee/Sullivan WI
1251 AM CDT Fri Jun 18 2021

WIC021-077-111-180601-
/O.CAN.KMKX.SV.W.0003.000000T0000Z-210618T0615Z/
Columbia WI-Marquette WI-Sauk WI-
1251 AM CDT Fri Jun 18 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN COLUMBIA...
SOUTHERN MARQUETTE AND NORTHEASTERN SAUK COUNTIES IS CANCELLED...
    
The storms which prompted the warning have weakened below severe
limits, and have exited the warned area. Therefore, the warning has 
been cancelled.  However gusty winds to 30 to 40 mph are still 
possible with these thunderstorms.

A Severe Thunderstorm Watch remains in effect until 400 AM CDT for
south central Wisconsin.

LAT...LON 4379 8917 4377 8917 4377 8923 4376 8925
      4364 8925 4364 8924 4338 8951 4353 8994
      4364 8989 4364 8960 4384 8960
TIME...MOT...LOC 0549Z 285DEG 40KT 4377 8942 4353 8959 

$$

CMILLER

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 18, 12:50 AM CDT	Special Weather Statement	MKX	Columbia	40 min
Jun 18, 1:27 AM CDT	Special Weather Statement	MKX	Green, Lafayette, Rock	63 min
Jun 18, 1:49 AM CDT	Special Weather Statement	MKX	Fond du Lac	26 min
Jun 18, 1:59 AM CDT	Special Weather Statement	MKX	Ozaukee, Sheboygan, Washington	46 min
Jun 18, 2:11 AM CDT	Special Marine Warning	MKX		79 min
Jun 18, 2:47 AM CDT	Special Weather Statement	MKX	Iowa	28 min
Jun 18, 3:09 AM CDT	Special Weather Statement	MKX	Rock	36 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.