Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 16, NWS Milwaukee, WI

July 29, 2021Dane County, Iowa County, Sauk County, Wisconsin

NWS Milwaukee, WI issued this severe thunderstorm warning at Jul 29, 2021, 12:51 AM CDT for Dane County, Iowa County, Sauk County, Wisconsin. It was in force for 39 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Jul 29, 2021, 12:51 AM CDT (05:51 UTC)
Expired
Jul 29, 2021, 1:30 AM CDT
In force
39 min
Issued by
NWS Milwaukee, WI
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Dane County, WI, Iowa County, WI, Sauk County, WI

The radar

The La Crosse radar (KARX), 118 km from the middle of the area, began a volume at 05:53 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Jul 28, 7:17 PM CDTSevere Thunderstorm Watch PDSSPC7 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 5.9 hours before the alert went out and 165 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-pSkew-T log-p diagram, Davenport, at 00:00Z on 2021-07-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4022 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Davenport, at 00:00Z on 2021-07-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 52 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
4022 J/kg
Mixed-layer CIN
-33 J/kg
Mixed-layer LCL
1022 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
52 m²/s²
0-3 km storm-relative helicity
90 m²/s²
Significant tornado parameter
1.0
Supercell composite
6.8

Open this sounding in Storm Lab

The text

As transmitted.

080 
WUUS53 KMKX 290551
SVRMKX
WIC025-049-111-290630-
/O.NEW.KMKX.SV.W.0016.210729T0551Z-210729T0630Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Milwaukee/Sullivan WI
1251 AM CDT Thu Jul 29 2021

The National Weather Service in Milwaukee/Sullivan has issued a

* Severe Thunderstorm Warning for...
  Iowa County in south central Wisconsin...
  Southwestern Dane County in south central Wisconsin...
  Southwestern Sauk County in south central Wisconsin...

* Until 130 AM CDT.

* At 1249 AM CDT, severe thunderstorms were located along a line
  extending from near Cross Plains to 7 miles southeast of Muscoda,
  moving southeast at 45 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated. At 61 MPH was reported at Lone Rock 
           Airport.

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

* Locations impacted include...
  Dodgeville, Mineral Point, Mazomanie, Spring Green, Blanchardville,
  Barneveld, Blue Mounds, Highland, Arena, Ridgeway, Centerville,
  Avoca, Orion, Linden, Waldwick, Cobb, Clyde, Rewey, Hollandale and
  Blackhawk Lake Rec Area.

This includes the following Locations Hyde's Mill, The House on the
Rock, and Iowa-Grant School.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4320 9043 4321 9029 4319 9028 4319 9025
      4317 9020 4324 9019 4323 8976 4286 8976
      4286 8984 4281 8984 4281 9043
TIME...MOT...LOC 0549Z 317DEG 41KT 4307 8959 4309 9037 

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

HANSEN

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 28, 11:18 PM CDTSevere Thunderstorm WarningMKXFond du Lac, Green Lake, Marquette72 min
Jul 28, 11:41 PM CDTTornado WarningMKXFond du Lac20 min
Jul 28, 11:48 PM CDTSpecial Weather StatementMKXSauk42 min
Jul 28, 11:55 PM CDTSevere Thunderstorm WarningMKXDodge, Washington65 min
Jul 29, 12:22 AM CDTSevere Thunderstorm WarningMKXColumbia, Dane, Sauk53 min
Jul 29, 12:26 AM CDTTornado WarningMKXColumbia, Dodge31 min
Jul 29, 12:43 AM CDTTornado WarningMKXColumbia, Dane, Dodge, Jefferson32 min
Jul 29, 12:45 AM CDTSevere Thunderstorm WarningMKXDane, Jefferson45 min
Jul 29, 12:57 AM CDTSevere Thunderstorm WarningMKXDodge, Washington48 min
Jul 29, 1:07 AM CDTSevere Thunderstorm WarningMKXGreen, Lafayette38 min
Jul 29, 1:08 AM CDTTornado WarningMKXJefferson, Waukesha37 min
Jul 29, 1:17 AM CDTSevere Thunderstorm WarningMKXDane, Jefferson, Kenosha, Milwaukee, Racine, Rock and 2 more67 min
Jul 29, 1:24 AM CDTSpecial Marine WarningMKX96 min
Jul 29, 1:31 AM CDTTornado WarningMKXMilwaukee, Racine, Walworth, Waukesha44 min
Jul 29, 1:36 AM CDTTornado WarningMKXRock24 min
Jul 29, 1:51 AM CDTSpecial Weather StatementMKXGreen, Lafayette24 min
Jul 29, 4:06 AM CDTSmall Craft AdvisoryMKX33 hr
Jul 29, 2:02 PM CDTBeach Hazards StatementMKXKenosha, Milwaukee, Ozaukee, Racine, Sheboygan29 hr

Nearby

Severe Thunderstorm Warnings in Wisconsin, 2021Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.