Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 40, NWS Milwaukee, WI

August 8, 2021Washington County, Wisconsin

NWS Milwaukee, WI issued this severe thunderstorm warning at Aug 8, 2021, 4:50 PM CDT for Washington County, Wisconsin. It was in force for 25 min. 4 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 8, 2021, 4:50 PM CDT (21:50 UTC)
Expired: Aug 8, 2021, 5:15 PM CDT
In force: 25 min
Issued by: NWS Milwaukee, WI
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Washington County, WI

The radar

The Milwaukee radar (KMKX), 53 km from the middle of the area, began a volume at 21:52 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 8, 5:07 PM CDT	TSTM WND DMG	4 Ne Allenton, WI	REPORTS OF A TWO FOOT DIAMETER TREE DOWN ACROSS BEAVER DAM ROAD JUST WEST OF TOWNLINE RD AND A 12 INCH DIAMETER BRANCH DOWN ACROSS TOWNLINE RD.
Aug 8, 5:11 PM CDT	TSTM WND DMG	3 Sw Kewaskum, WI	ONE FOOT DIAMETER TREE DOWN ACROSS RIDGE RD. ONE QUARTER MILE WEST OF HIGHLAND DR. MULTIPLE SIX INCH DIAMETER BRANCHES DOWN NEARBY AS WELL.
Aug 8, 5:15 PM CDT	TSTM WND DMG	2 Wsw Kewaskum, WI	POWER POLES SNAPPED AND LINES DOWN AT THE INTERSECTION OF COUNTY ROAD H AND HIGHLAND DRIVE.
Aug 8, 5:16 PM CDT	TSTM WND DMG	Kewaskum, WI	TREE DOWN AND SPLIT IN KEWASKUM.

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

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 9.8 hours before the alert went out and 121 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: 445 J/kg
Mixed-layer CIN: -23 J/kg
Mixed-layer LCL: 568 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 108 m²/s²
0-3 km storm-relative helicity: 44 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

964 
WUUS53 KMKX 082150
SVRMKX
WIC131-082215-
/O.NEW.KMKX.SV.W.0040.210808T2150Z-210808T2215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Milwaukee/Sullivan WI
450 PM CDT Sun Aug 8 2021

The National Weather Service in Milwaukee/Sullivan has issued a

* Severe Thunderstorm Warning for...
  Northern Washington County in southeastern Wisconsin...

* Until 515 PM CDT.

* At 450 PM CDT, a severe thunderstorm was located near Slinger,
  moving northeast at 30 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  West Bend, Jackson, Slinger, Kewaskum, Addison, Wayne, Fillmore,
  Boltonville, Allenton, Keowns, Nabob, Saint Lawrence and
  Kohlsville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4329 8823 4336 8842 4337 8841 4337 8840
      4339 8840 4354 8831 4354 8804 4345 8804
TIME...MOT...LOC 2150Z 209DEG 24KT 4339 8826 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

HANSEN

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 7, 7:00 PM CDT	Special Weather Statement	MKX	Rock	30 min
Aug 7, 7:20 PM CDT	Special Weather Statement	MKX	Waukesha	25 min
Aug 7, 7:32 PM CDT	Special Weather Statement	MKX	Walworth	58 min
Aug 7, 7:51 PM CDT	Special Weather Statement	MKX	Milwaukee, Waukesha	54 min
Aug 7, 8:06 PM CDT	Special Weather Statement	MKX	Racine, Walworth	69 min
Aug 7, 9:13 PM CDT	Special Weather Statement	MKX	Green Lake, Marquette	77 min
Aug 7, 10:01 PM CDT	Special Weather Statement	MKX	Dodge, Fond du Lac, Washington	59 min
Aug 7, 10:22 PM CDT	Areal Flood Advisory	MKX	Fond du Lac, Green Lake, Marquette	3 hr
Aug 7, 10:33 PM CDT	Special Weather Statement	MKX	Ozaukee, Sheboygan	57 min
Aug 7, 11:00 PM CDT	Special Weather Statement	MKX	Washington	60 min
Aug 7, 11:36 PM CDT	Areal Flood Advisory	MKX	Dodge, Ozaukee, Washington	75 min
Aug 7, 11:56 PM CDT	Special Weather Statement	MKX	Dodge	34 min
Aug 8, 12:49 AM CDT	Areal Flood Warning	MKX	Dodge, Ozaukee, Washington	6 hr
Aug 8, 12:56 AM CDT	River Flood Warning	MKX	Fond du Lac	11 hr
Aug 8, 1:37 AM CDT	Areal Flood Warning	MKX	Milwaukee, Ozaukee, Washington, Waukesha	5 hr
Aug 8, 2:19 AM CDT	Flash Flood Warning	MKX	Milwaukee, Ozaukee	3 hr
Aug 8, 2:43 AM CDT	Flash Flood Watch	MKX	Columbia, Dodge, Fond du Lac, Green Lake, Marquette, Milwaukee and 3 more	17 hr
Aug 8, 9:54 AM CDT	Small Craft Advisory	MKX		10 hr
Aug 8, 4:24 PM CDT	Severe Thunderstorm Warning	MKX	Green Lake, Marquette	36 min
Aug 8, 4:38 PM CDT	Special Weather Statement	MKX	Dodge	37 min
Aug 8, 5:05 PM CDT	Special Marine Warning	MKX		24 min
Aug 8, 5:12 PM CDT	Special Weather Statement	MKX	Washington	33 min
Aug 8, 5:37 PM CDT	Special Weather Statement	MKX	Sheboygan	23 min
Aug 8, 5:45 PM CDT	Severe Thunderstorm Warning	MKX	Sheboygan	30 min
Aug 8, 6:09 PM CDT	Special Marine Warning	MKX		51 min
Aug 8, 6:50 PM CDT	Special Marine Warning	MKX		55 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.