Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 13, NWS Milwaukee, WI

July 28, 2021Dodge County, Washington County, Wisconsin

NWS Milwaukee, WI issued this severe thunderstorm warning at Jul 28, 2021, 11:55 PM CDT for Dodge County, Washington County, Wisconsin. It was in force for 65 min. 2 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: Jul 28, 2021, 11:55 PM CDT (04:55 UTC)
Expired: Jul 29, 2021, 1:00 AM CDT
In force: 65 min
Issued by: NWS Milwaukee, WI
Area: Storm-based polygon
Hail: 0.75 in
Wind: 70.0 mph

Counties Dodge County, WI, Washington County, WI

The radar

The Milwaukee radar (KMKX), 50 km from the middle of the area, began a volume at 04:55 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
Jul 29, 12:32 AM CDT	TSTM WND DMG	2 Nnw Fox Lake, WI	LARGE TREE DOWN ALONG WITH DISPLACED BOAT HOIST ON THE EAST SIDE OF ELMWOOD ISLAND. TIME ESTIMATED WITH RADAR.
Jul 29, 1:00 AM CDT	TSTM WND DMG	Clyman, WI	MULTIPLE TREES DOWN IN CLYMAN. TIME ESTIMATED FROM RADAR.

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
Jul 28, 7:17 PM CDT	Severe Thunderstorm Watch PDS	SPC	7 hr

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 00:00Z, 4.9 hours before the alert went out and 122 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: 593 J/kg
Mixed-layer CIN: -264 J/kg
Mixed-layer LCL: 1088 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 62 m²/s²
0-3 km storm-relative helicity: 154 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

523 
WUUS53 KMKX 290455
SVRMKX
WIC027-131-290600-
/O.NEW.KMKX.SV.W.0013.210729T0455Z-210729T0600Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Milwaukee/Sullivan WI
1155 PM CDT Wed Jul 28 2021

The National Weather Service in Milwaukee/Sullivan has issued a

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

* Until 100 AM CDT.

* At 1155 PM CDT, severe thunderstorms were located along a line
  extending from near Fond Du Lac to near Waupun to near Princeton,
  moving southeast at 45 mph.

  HAZARD...70 mph wind gusts and penny size hail.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  West Bend, Watertown, Beaver Dam, Hartford, Waupun, Jackson,
  Mayville, Slinger, Kewaskum, Horicon, Juneau, Germantown, Lomira,
  Theresa, Hustisford, Iron Ridge, Burnett, Richfield, Addison and
  Ashippun.

This includes the following Location Horicon Marsh.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4320 8807 4320 8901 4363 8900 4363 8841
      4354 8840 4354 8817 4331 8806
TIME...MOT...LOC 0455Z 331DEG 41KT 4381 8838 4367 8875 4384 8918 

HAIL...0.75IN
WIND...70MPH
 
$$

HANSEN

1 follow-up statement

854 
WWUS53 KMKX 290529
SVSMKX

Severe Weather Statement
National Weather Service Milwaukee/Sullivan WI
1229 AM CDT Thu Jul 29 2021

WIC027-131-290600-
/O.CON.KMKX.SV.W.0013.000000T0000Z-210729T0600Z/
Washington WI-Dodge WI-
1229 AM CDT Thu Jul 29 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 100 AM CDT
FOR WASHINGTON AND DODGE COUNTIES...

At 1229 AM CDT, severe thunderstorms were located along a line
extending from near Kewaskum to near Horicon to near Randolph to near
Rio, moving southeast at 40 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
West Bend, Watertown, Beaver Dam, Hartford, Waupun, Jackson,
Mayville, Slinger, Kewaskum, Horicon, Juneau, Germantown, Lomira,
Theresa, Hustisford, Iron Ridge, Burnett, Richfield, Addison and
Ashippun.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4320 8807 4320 8901 4363 8900 4363 8841
      4354 8840 4354 8817 4331 8806
TIME...MOT...LOC 0529Z 321DEG 34KT 4352 8815 4351 8868 4358 8896 4342
8930

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

HANSEN

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 28, 11:18 PM CDT	Severe Thunderstorm Warning	MKX	Fond du Lac, Green Lake, Marquette	72 min
Jul 28, 11:41 PM CDT	Tornado Warning	MKX	Fond du Lac	20 min
Jul 28, 11:48 PM CDT	Special Weather Statement	MKX	Sauk	42 min
Jul 29, 12:22 AM CDT	Severe Thunderstorm Warning	MKX	Columbia, Dane, Sauk	53 min
Jul 29, 12:26 AM CDT	Tornado Warning	MKX	Columbia, Dodge	31 min
Jul 29, 12:43 AM CDT	Tornado Warning	MKX	Columbia, Dane, Dodge, Jefferson	32 min
Jul 29, 12:45 AM CDT	Severe Thunderstorm Warning	MKX	Dane, Jefferson	45 min
Jul 29, 12:51 AM CDT	Severe Thunderstorm Warning	MKX	Dane, Iowa, Sauk	39 min
Jul 29, 12:57 AM CDT	Severe Thunderstorm Warning	MKX	Dodge, Washington	48 min
Jul 29, 1:07 AM CDT	Severe Thunderstorm Warning	MKX	Green, Lafayette	38 min
Jul 29, 1:08 AM CDT	Tornado Warning	MKX	Jefferson, Waukesha	37 min
Jul 29, 1:17 AM CDT	Severe Thunderstorm Warning	MKX	Dane, Jefferson, Kenosha, Milwaukee, Racine, Rock and 2 more	67 min
Jul 29, 1:24 AM CDT	Special Marine Warning	MKX		96 min
Jul 29, 1:31 AM CDT	Tornado Warning	MKX	Milwaukee, Racine, Walworth, Waukesha	44 min
Jul 29, 1:36 AM CDT	Tornado Warning	MKX	Rock	24 min
Jul 29, 1:51 AM CDT	Special Weather Statement	MKX	Green, Lafayette	24 min
Jul 29, 4:06 AM CDT	Small Craft Advisory	MKX		33 hr
Jul 29, 2:02 PM CDT	Beach Hazards Statement	MKX	Kenosha, Milwaukee, Ozaukee, Racine, Sheboygan	29 hr

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.