Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 50, NWS Milwaukee, WI

August 10, 20214 counties in Wisconsin

NWS Milwaukee, WI issued this severe thunderstorm warning at Aug 10, 2021, 7:43 PM CDT for 4 counties in Wisconsin. It was in force for 32 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: Aug 10, 2021, 7:43 PM CDT (00:43 UTC)
Expired: Aug 10, 2021, 8:15 PM CDT
In force: 32 min
Issued by: NWS Milwaukee, WI
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Kenosha County, WI, Milwaukee County, WI, Ozaukee County, WI, Racine County, WI

The radar

The Milwaukee radar (KMKX), 52 km from the middle of the area, began a volume at 00:46 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
Aug 10, 7:43 PM CDT	TSTM WND GST 49	2 W North Bay, WI	RAC.

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
Aug 10, 3:47 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 0.7 hours before the alert went out and 265 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: 856 J/kg
Mixed-layer CIN: -155 J/kg
Mixed-layer LCL: 940 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 77 m²/s²
0-3 km storm-relative helicity: 160 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -1.4

Open this sounding in Storm Lab

The text

As transmitted.

126 
WUUS53 KMKX 110043
SVRMKX
WIC059-079-089-101-110115-
/O.NEW.KMKX.SV.W.0050.210811T0043Z-210811T0115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Milwaukee/Sullivan WI
743 PM CDT Tue Aug 10 2021

The National Weather Service in Milwaukee/Sullivan has issued a

* Severe Thunderstorm Warning for...
  Ozaukee County in southeastern Wisconsin...
  Milwaukee County in southeastern Wisconsin...
  Northeastern Racine County in southeastern Wisconsin...
  Kenosha County in southeastern Wisconsin...

* Until 815 PM CDT.

* At 742 PM CDT, severe thunderstorms were located along a line
  extending from near Random Lake to near Pleasant Prairie, moving
  east at 20 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Milwaukee, Kenosha, Racine, West Allis, Wauwatosa, Greenfield, Oak
  Creek, Mount Pleasant, Mequon, South Milwaukee, Pleasant Prairie,
  Cudahy, Whitefish Bay, Greendale, Brown Deer, Grafton, Cedarburg,
  Port Washington, St. Francis and Hales Corners.

People attending The Wisconsin State Fair, and Music in the Glen in
Glendale should seek safe shelter immediately!

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4284 8810 4284 8807 4337 8806 4337 8804
      4354 8803 4354 8780 4349 8779 4338 8787
      4324 8791 4318 8788 4312 8790 4307 8787
      4302 8790 4296 8785 4285 8783 4278 8775
      4261 8782 4249 8780 4250 8811
TIME...MOT...LOC 0042Z 248DEG 19KT 4353 8798 4252 8796 

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

$$

KAVINSKY

1 follow-up statement

933 
WWUS53 KMKX 110110
SVSMKX

Severe Weather Statement
National Weather Service Milwaukee/Sullivan WI
810 PM CDT Tue Aug 10 2021

WIC059-079-089-101-110120-
/O.EXP.KMKX.SV.W.0050.000000T0000Z-210811T0115Z/
Ozaukee WI-Milwaukee WI-Racine WI-Kenosha WI-
810 PM CDT Tue Aug 10 2021

...THE SEVERE THUNDERSTORM WARNING FOR OZAUKEE...MILWAUKEE...
NORTHEASTERN RACINE AND KENOSHA COUNTIES WILL EXPIRE AT 815 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
southeastern Wisconsin.

LAT...LON 4284 8810 4284 8807 4337 8806 4337 8804
      4354 8803 4354 8780 4349 8779 4338 8787
      4324 8791 4318 8788 4312 8790 4307 8787
      4302 8790 4296 8785 4285 8783 4278 8775
      4261 8782 4249 8780 4250 8811
TIME...MOT...LOC 0110Z 270DEG 19KT 4358 8779 4257 8777 

$$

KAVINSKY

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 10, 7:05 PM CDT	Special Weather Statement	MKX	Jefferson	25 min
Aug 10, 7:24 PM CDT	Severe Thunderstorm Warning	MKX	Sheboygan	51 min
Aug 10, 8:07 PM CDT	Special Marine Warning	MKX		53 min
Aug 10, 8:16 PM CDT	Special Marine Warning	MKX		44 min
Aug 11, 6:44 AM CDT	Small Craft Advisory	MKX		15 hr
Aug 11, 9:58 AM CDT	Special Weather Statement	MKX	Kenosha, Milwaukee, Racine, Rock, Walworth	77 min
Aug 11, 10:06 AM CDT	Special Marine Warning	MKX		84 min
Aug 11, 2:46 PM CDT	Severe Thunderstorm Warning	MKX	Green Lake, Marquette	59 min
Aug 11, 4:22 PM CDT	Severe Thunderstorm Warning	MKX	Iowa	53 min
Aug 11, 5:05 PM CDT	Special Weather Statement	MKX	Iowa	25 min
Aug 11, 5:10 PM CDT	Severe Thunderstorm Warning	MKX	Iowa	50 min
Aug 11, 5:24 PM CDT	Special Weather Statement	MKX	Milwaukee	36 min
Aug 11, 5:49 PM CDT	Severe Thunderstorm Warning	MKX	Milwaukee, Waukesha	41 min
Aug 11, 5:56 PM CDT	Special Marine Warning	MKX		94 min
Aug 11, 5:58 PM CDT	Special Weather Statement	MKX	Iowa	47 min
Aug 11, 6:04 PM CDT	Tornado Warning	MKX	Iowa	41 min
Aug 11, 6:24 PM CDT	Severe Thunderstorm Warning	MKX	Kenosha, Racine, Walworth	53 min
Aug 11, 6:34 PM CDT	Tornado Warning	MKX	Dane	15 min
Aug 11, 6:48 PM CDT	Special Marine Warning	MKX		57 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.