Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 15, NWS Milwaukee, WI

July 29, 2021Dane County, Jefferson County, Wisconsin

NWS Milwaukee, WI issued this severe thunderstorm warning at Jul 29, 2021, 12:45 AM CDT for Dane County, Jefferson County, Wisconsin. It was in force for 45 min. 16 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 29, 2021, 12:45 AM CDT (05:45 UTC)
Expired: Jul 29, 2021, 1:30 AM CDT
In force: 45 min
Issued by: NWS Milwaukee, WI
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

Counties Dane County, WI, Jefferson County, WI

The radar

The Milwaukee radar (KMKX), 54 km from the middle of the area, began a volume at 05:47 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, 12:47 AM CDT	TSTM WND DMG	Cross Plains, WI	MULTIPLE TREES DOWN ON POWER LINES. RELAYED FROM SOCIAL MEDIA.
Jul 29, 12:47 AM CDT	TORNADO	3 Nnw Verona, WI	NWS STORM SURVEY HAS CONFIRMED AN EF-1 TORNADO BETWEEN THE TOWN OF MIDDLETON AND VERONA. THIS TORNADO PRODUCED AN AREA OF DAMAGE BEGINNING JUST NORTH OF HAWKS LANDING GOLF COURSE AND JUST NORTH OF VERONA PUBLIC LIBRARY. PATH LENGTH IS ESTIMATED TO BE 3.3 MILES
Jul 29, 12:50 AM CDT	TSTM WND DMG	Middleton, WI	REPORTS OF MULTIPLE TREES SNAPPED AND UPROOTED ACROSS MIDDLETON. TREES ON POWERLINES AND TREES ON HOUSES AND OTHER STRUCTURES. TIME ESTIMATED FROM RADAR.
Jul 29, 12:55 AM CDT	TSTM WND DMG	1 N Verona, WI	SEVERAL REPORTS OF TREE AND MINOR STRUCTURAL DAMAGE BETWEEN VERONA AND MIDDLETON.
Jul 29, 1:03 AM CDT	TSTM WND DMG	Watertown, WI	RELAYED FROM WISN LARGE TREE DOWN IN WATERTOWN. TIME ESTIMATED FROM RADAR.
Jul 29, 1:05 AM CDT	TORNADO	3 Sw Watertown, WI	NWS STORM SURVEY FOUND PRELIMINARY EF0 TORNADO DAMAGE JUST SOUTHWEST OF WATERTOWN. DAMAGE IS CONCENTRATED ALONG HILLTOP RD JUST NORTH OF HIGHWAY A. TORNADO OCCURRED AT APPROXIMATELY 1:05 AM CDT ON JULY 29, 2021. PATH LENGTH AND OTHER DETAILS TBD.
Jul 29, 1:07 AM CDT	TSTM WND DMG	4 W Watertown, WI	BARN DAMAGE NEAR INTERSECTION OF WEST RD AND T.
Jul 29, 1:10 AM CDT	TSTM WND DMG	2 N Sullivan, WI	TREES DAMAGE AND TREES DOWN ON HIGHWAY F AND E FROM SULLIVAN TO CONCORD. TIME ESTIMATED FROM RADAR.
Jul 29, 1:10 AM CDT	TORNADO	4 E Johnson Creek, WI	NWS STORM SURVEY HAS CONFIRMED AN EF-0 TORNADO NORTH OF FARMINGTON. THIS TORNADO PRODUCED A NARROW PATH OF DAMAGE BEGINNING NORTH OF I-94 ALONG SAUCER DR. AND ENDING JUST SOUTH OF I-94. PATH LENGTH IS ESTIMATED TO BE 0.7 MILES LONG WITH PEAK WIND SPEED AROUND
Jul 29, 1:12 AM CDT	TSTM WND GST 70	Johnson Creek, WI	NWS EMPLOYEE ESTIMATED WIND GUST OF 70 MPH.
Jul 29, 1:13 AM CDT	TSTM WND DMG	4 N Sullivan, WI	POWER POLES DOWN ACROSS HIGHWAY F. DEBRIS FROM HOUSES AND OTHER STRUCTURES COVERING ROADWAY. TIME ESTIMATED FROM RADAR.
Jul 29, 1:15 AM CDT	TSTM WND DMG	4 Sse Pipersville, WI	REPORT OF MULTIPLE HOMES AND BUILDINGS DAMAGED ALONG COUNTY RD E JUST NORTH OF I-94 IN CONCORD.
Jul 29, 1:15 AM CDT	TORNADO	4 Sse Pipersville, WI	...EDITED TO INCLUDE PATH LENGTH EXTENDED INTO WAUKESHA COUNTY...NWS STORM SURVEY HAS CONFIRMED A TORNADO STARTING BETWEEN WATERTOWN AND CONCORD, WITH WIDESPREAD DAMAGE IN THE CONCORD AREA. THE PATH EXTENDS SOUTHEAST INTO WAUKESHA COUNTY, ENDING NORTH OF DOUSM
Jul 29, 1:15 AM CDT	TORNADO	4 Sse Pipersville, WI	NWS STORM SURVEY HAS CONFIRMED A TORNADO NEAR CONCORD WI DURING THE EARLY MORNING HOURS OF JULY 29, 2021. THE TORNADO HAS A PRELIMINARY DAMAGE RATING OF EF1. PATH LENGTH AND OTHER DETAILS ARE STILL TBD.
Jul 29, 1:18 AM CDT	TSTM WND DMG	4 N Sullivan, WI	BUSINESS BUILDING DAMAGE.
Jul 29, 1:24 AM CDT	TSTM WND DMG	2 E Sullivan, WI	MULTIPLE VERY LARGE TREES BROKEN AND DOWNED.

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, 5.8 hours before the alert went out and 176 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.

593 
WUUS53 KMKX 290545
SVRMKX
WIC025-055-290630-
/O.NEW.KMKX.SV.W.0015.210729T0545Z-210729T0630Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Milwaukee/Sullivan WI
1245 AM CDT Thu Jul 29 2021

The National Weather Service in Milwaukee/Sullivan has issued a

* Severe Thunderstorm Warning for...
  Dane County in south central Wisconsin...
  Jefferson County in southeastern Wisconsin...

* Until 130 AM CDT.

* At 1245 AM CDT, severe thunderstorms were located along a line
  extending from near Fall River to near Marshall to near Cross
  Plains, moving southeast at 50 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Madison, Sun Prairie, Fitchburg, Watertown, Middleton, Whitewater,
  Stoughton, Fort Atkinson, Waunakee, Verona, Oregon, Jefferson,
  McFarland, Monona, Mount Horeb, Windsor, Lake Mills, Edgerton,
  Marshall and Waterloo.

People attending The CrossFit Games in Madison should seek safe
shelter immediately!

This includes the following Location Wisconsin State Capitol.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4286 8976 4314 8976 4326 8917 4328 8916
      4328 8901 4320 8901 4320 8854 4284 8855
TIME...MOT...LOC 0545Z 319DEG 42KT 4342 8895 4320 8910 4309 8959 

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 28, 11:55 PM CDT	Severe Thunderstorm Warning	MKX	Dodge, Washington	65 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, 12:51 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.