Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 48, NWS Milwaukee, WI

August 10, 20214 counties in Wisconsin

NWS Milwaukee, WI issued this severe thunderstorm warning at Aug 10, 2021, 6:51 PM CDT for 4 counties in Wisconsin. It was in force for 54 min. 10 reports 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, 6:51 PM CDT (23:51 UTC)
Expired: Aug 10, 2021, 7:45 PM CDT
In force: 54 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), 51 km from the middle of the area, began a volume at 23:54 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, 7:18 PM CDT	TSTM WND DMG	West Allis, WI	LARGE TREE UPROOTED.
Aug 10, 7:20 PM CDT	TSTM WND DMG	Wauwatosa, WI	LARGE BRANCH 12-15 INCHES IN DIAMETER DOWN.
Aug 10, 7:20 PM CDT	TSTM WND GST 50	1 N Bristol, WI
Aug 10, 7:29 PM CDT	TSTM WND DMG	Whitefish Bay, WI	LARGE TREE UPROOTED...POWER LINES DOWN.
Aug 10, 7:30 PM CDT	TSTM WND DMG	2 Nnw Kenosha, WI	LARGE TREE UPROOTED.
Aug 10, 7:30 PM CDT	TSTM WND GST 47	2 E Butler, WI	MWC.
Aug 10, 7:30 PM CDT	TSTM WND GST 52	Brown Deer, WI
Aug 10, 7:33 PM CDT	TSTM WND GST 50	2 Wsw Saint Francis, WI	MKE.
Aug 10, 7:40 PM CDT	TSTM WND DMG	Mequon, WI	SPORADIC DOWNED POWER LINES AND OLD/DEAD TREES DOWNED ACROSS SOUTHERN AND EASTERN PORTIONS OF THE COUNTY.
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

Green Bay/Straub, WI (KGRB), launched 12:00Z, 11.9 hours before the alert went out and 168 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: 32 J/kg
Mixed-layer CIN: -550 J/kg
Mixed-layer LCL: 828 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 42 m²/s²
0-3 km storm-relative helicity: 117 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

470 
WUUS53 KMKX 102351
SVRMKX
WIC059-079-089-101-110045-
/O.NEW.KMKX.SV.W.0048.210810T2351Z-210811T0045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Milwaukee/Sullivan WI
651 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 745 PM CDT.

* At 650 PM CDT, severe thunderstorms were located along a line
  extending from Lomira to Powers Lake, moving east at 65 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 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 4250 8811 4284 8811 4284 8807 4354 8804
      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 4249 8808
TIME...MOT...LOC 2350Z 276DEG 55KT 4358 8846 4253 8828 

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

$$

KAVINSKY

2 follow-up statements

321 
WWUS53 KMKX 110013
SVSMKX

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

WIC059-079-089-101-110045-
/O.CON.KMKX.SV.W.0048.000000T0000Z-210811T0045Z/
Ozaukee WI-Milwaukee WI-Racine WI-Kenosha WI-
713 PM CDT Tue Aug 10 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM CDT
FOR OZAUKEE...MILWAUKEE...NORTHEASTERN RACINE AND EASTERN KENOSHA
COUNTIES...

At 712 PM CDT, severe thunderstorms were located along a line 
extending from near Kewaskum to near Camp Lake, moving east at 50 
mph.

HAZARD...70 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings.

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 4250 8808 4284 8808 4284 8804 4354 8801
      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 4249 8805
TIME...MOT...LOC 0012Z 271DEG 31KT 4354 8813 4253 8810 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

KAVINSKY

839 
WWUS53 KMKX 110032
SVSMKX

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

WIC059-079-089-101-110045-
/O.CON.KMKX.SV.W.0048.000000T0000Z-210811T0045Z/
Ozaukee WI-Milwaukee WI-Racine WI-Kenosha WI-
732 PM CDT Tue Aug 10 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM CDT
FOR OZAUKEE...MILWAUKEE...NORTHEASTERN RACINE AND EASTERN KENOSHA
COUNTIES...

At 731 PM CDT, severe thunderstorms were located along a line
extending from Belgium to near Winthrop Harbor, moving east at 60
mph.

HAZARD...70 mph wind gusts.

SOURCE...Trained weather spotters reported tree damage in the 
         Wauwatosa area.

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings.

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 4250 8808 4284 8808 4284 8804 4354 8801
      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 4249 8805
TIME...MOT...LOC 0031Z 276DEG 51KT 4351 8782 4250 8780 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...OBSERVED
MAX WIND GUST...70 MPH

$$

KAVINSKY

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 9, 7:13 PM CDT	Marine Dense Fog Advisory	MKX		14 hr
Aug 10, 2:16 PM CDT	Heat Advisory	MKX	Dane, Dodge, Green, Iowa, Jefferson, Kenosha and 8 more	29 hr
Aug 10, 4:02 PM CDT	Severe Thunderstorm Warning	MKX	Dane, Iowa, Lafayette, Sauk	73 min
Aug 10, 4:25 PM CDT	Severe Thunderstorm Warning	MKX	Iowa, Lafayette	80 min
Aug 10, 5:08 PM CDT	Severe Thunderstorm Warning	MKX	Columbia, Dane, Green, Iowa, Sauk	67 min
Aug 10, 5:36 PM CDT	Special Weather Statement	MKX	Rock	39 min
Aug 10, 5:42 PM CDT	Severe Thunderstorm Warning	MKX	Dane, Dodge, Jefferson, Rock	78 min
Aug 10, 6:08 PM CDT	Severe Thunderstorm Warning	MKX	Dodge, Jefferson, Kenosha, Racine, Walworth, Washington and 1 more	97 min
Aug 10, 6:12 PM CDT	Severe Thunderstorm Warning	MKX	Columbia, Dane	20 min
Aug 10, 6:24 PM CDT	Special Marine Warning	MKX		111 min
Aug 10, 6:44 PM CDT	Special Weather Statement	MKX	Fond du Lac, Sheboygan	76 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.