Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 21, NWS Milwaukee, WI

August 6, 2021Dodge County, Fond du Lac County, Wisconsin

NWS Milwaukee, WI issued this severe thunderstorm warning at Aug 6, 2021, 4:09 PM CDT for Dodge County, Fond du Lac 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: Aug 6, 2021, 4:09 PM CDT (21:09 UTC)
Expired: Aug 6, 2021, 4:48 PM CDT
In force: 39 min
Issued by: NWS Milwaukee, WI
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

Counties Dodge County, WI, Fond du Lac County, WI

The radar

The Milwaukee radar (KMKX), 85 km from the middle of the area, began a volume at 21:08 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 nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 9.2 hours before the alert went out and 87 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: 132 J/kg
Mixed-layer CIN: -114 J/kg
Mixed-layer LCL: 962 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 84 m²/s²
0-3 km storm-relative helicity: 98 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

957 
WUUS53 KMKX 062109
SVRMKX
WIC027-039-062200-
/O.NEW.KMKX.SV.W.0021.210806T2109Z-210806T2200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Milwaukee/Sullivan WI
409 PM CDT Fri Aug 6 2021

The National Weather Service in Milwaukee/Sullivan has issued a

* Severe Thunderstorm Warning for...
  Southeastern Fond du Lac County in east central Wisconsin...
  Northeastern Dodge County in southeastern Wisconsin...

* Until 500 PM CDT.

* At 409 PM CDT, a severe thunderstorm was located near Oakfield, or
  near Fond Du Lac, moving east at 20 mph.

  HAZARD...Quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Damage to vehicles is expected.

* Locations impacted include...
  Fond Du Lac, Lomira, Oakfield, Lamartine, Byron, Eden, Brownsville,
  Dundee, Waucousta and Town of Forest.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4381 8830 4368 8816 4365 8816 4360 8852
      4373 8860
TIME...MOT...LOC 2109Z 259DEG 19KT 4368 8844 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH

$$

HANSEN

1 follow-up statement

319 
WWUS53 KMKX 062148
SVSMKX

Severe Weather Statement
National Weather Service Milwaukee/Sullivan WI
448 PM CDT Fri Aug 6 2021

WIC027-039-062158-
/O.CAN.KMKX.SV.W.0021.000000T0000Z-210806T2200Z/
Fond du Lac WI-Dodge WI-
448 PM CDT Fri Aug 6 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN FOND DU LAC AND
NORTHEASTERN DODGE COUNTIES IS CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled.  However gusty winds are
still possible with this thunderstorm.

LAT...LON 4381 8830 4368 8816 4365 8816 4360 8852
      4373 8860
TIME...MOT...LOC 2147Z 259DEG 19KT 4372 8816 

$$

HANSEN

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 6, 3:06 PM CDT	Special Weather Statement	MKX	Calumet	24 min
Aug 6, 3:44 PM CDT	Special Weather Statement	MKX	Sheboygan	31 min
Aug 6, 3:48 PM CDT	Special Marine Warning	MKX		42 min
Aug 6, 4:04 PM CDT	Severe Thunderstorm Warning	MKX	Fond du Lac, Sheboygan	41 min
Aug 6, 4:21 PM CDT	Severe Thunderstorm Warning	MKX	Sheboygan	24 min
Aug 6, 4:23 PM CDT	Special Marine Warning	MKX		52 min
Aug 6, 4:38 PM CDT	Severe Thunderstorm Warning	MKX	Sheboygan	52 min
Aug 6, 4:41 PM CDT	Special Marine Warning	MKX		64 min
Aug 6, 4:58 PM CDT	Severe Thunderstorm Warning	MKX	Dodge, Jefferson	32 min
Aug 6, 5:06 PM CDT	Severe Thunderstorm Warning	MKX	Ozaukee, Sheboygan	24 min
Aug 6, 5:08 PM CDT	Special Marine Warning	MKX		52 min
Aug 6, 5:23 PM CDT	Special Marine Warning	MKX		111 min
Aug 6, 5:26 PM CDT	Special Weather Statement	MKX	Dodge, Ozaukee, Washington, Waukesha	94 min
Aug 6, 6:22 PM CDT	Severe Thunderstorm Warning	MKX	Jefferson	38 min
Aug 6, 6:53 PM CDT	Special Weather Statement	MKX	Jefferson, Milwaukee, Waukesha	82 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.