Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 51, NWS Milwaukee, WI

August 11, 2021Green Lake County, Marquette County, Wisconsin

NWS Milwaukee, WI issued this severe thunderstorm warning at Aug 11, 2021, 2:46 PM CDT for Green Lake County, Marquette County, Wisconsin. It was in force for 59 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 11, 2021, 2:46 PM CDT (19:46 UTC)
Expired: Aug 11, 2021, 3:45 PM CDT
In force: 59 min
Issued by: NWS Milwaukee, WI
Area: Storm-based polygon
Tornado: Possible
Hail: 1.0 in
Wind: 60.0 mph

Counties Green Lake County, WI, Marquette County, WI

The radar

The Green Bay radar (KGRB), 110 km from the middle of the area, began a volume at 19:48 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.

Issued	Product	Office	Lasted
Aug 11, 12:17 PM CDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 7.8 hours before the alert went out and 110 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: 1499 J/kg
Mixed-layer CIN: -136 J/kg
Mixed-layer LCL: 678 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 156 m²/s²
0-3 km storm-relative helicity: 206 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.1

Open this sounding in Storm Lab

The text

As transmitted.

511 
WUUS53 KMKX 111946
SVRMKX
WIC047-077-112100-
/O.NEW.KMKX.SV.W.0051.210811T1946Z-210811T2100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Milwaukee/Sullivan WI
246 PM CDT Wed Aug 11 2021

The National Weather Service in Milwaukee/Sullivan has issued a

* Severe Thunderstorm Warning for...
  Northern Green Lake County in south central Wisconsin...
  Marquette County in south central Wisconsin...

* Until 400 PM CDT.

* At 245 PM CDT, a severe thunderstorm was located near Adams, or
  near Friendship, moving east at 45 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...
  Berlin, Montello, Westfield, Princeton, Green Lake, Lawrence,
  Mecan, Oxford, Neshkoro, Springfield Corners and Harrisville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 800 PM CDT for south central
Wisconsin.

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

&&

LAT...LON 4379 8889 4378 8960 4398 8960 4398 8889
TIME...MOT...LOC 1945Z 268DEG 38KT 4392 8977 

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

$$

STUMPF

4 follow-up statements

845 
WWUS53 KMKX 112010
SVSMKX

Severe Weather Statement
National Weather Service Milwaukee/Sullivan WI
310 PM CDT Wed Aug 11 2021

WIC047-077-112100-
/O.CON.KMKX.SV.W.0051.000000T0000Z-210811T2100Z/
Green Lake WI-Marquette WI-
310 PM CDT Wed Aug 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM CDT
FOR NORTHERN GREEN LAKE AND NORTHERN MARQUETTE COUNTIES...

At 310 PM CDT, a severe thunderstorm was located near Westfield, or
10 miles southwest of Wautoma, moving east at 45 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...
Berlin, Westfield, Princeton, Green Lake, Lawrence, Neshkoro,
Springfield Corners and Harrisville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 800 PM CDT for south central
Wisconsin.

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

&&

LAT...LON 4384 8889 4383 8960 4398 8960 4398 8889
TIME...MOT...LOC 2010Z 268DEG 38KT 4393 8940 

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

$$

STUMPF

223 
WWUS53 KMKX 112022
SVSMKX

Severe Weather Statement
National Weather Service Milwaukee/Sullivan WI
322 PM CDT Wed Aug 11 2021

WIC047-077-112100-
/O.CON.KMKX.SV.W.0051.000000T0000Z-210811T2100Z/
Green Lake WI-Marquette WI-
322 PM CDT Wed Aug 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM CDT
FOR NORTHERN GREEN LAKE AND NORTHEASTERN MARQUETTE COUNTIES...

At 321 PM CDT, a severe thunderstorm was located 7 miles northwest of
Princeton, or 9 miles south of Wautoma, moving east at 45 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...
Berlin, Princeton, Green Lake and Neshkoro. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 800 PM CDT for south central
Wisconsin.

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

&&

LAT...LON 4383 8940 4398 8941 4398 8889 4384 8889
TIME...MOT...LOC 2021Z 268DEG 38KT 4393 8923 

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

$$

STUMPF

722 
WWUS53 KMKX 112032
SVSMKX

Severe Weather Statement
National Weather Service Milwaukee/Sullivan WI
332 PM CDT Wed Aug 11 2021

WIC047-077-112100-
/O.CON.KMKX.SV.W.0051.000000T0000Z-210811T2100Z/
Green Lake WI-Marquette WI-
332 PM CDT Wed Aug 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM CDT
FOR NORTHERN GREEN LAKE AND NORTHEASTERN MARQUETTE COUNTIES...

At 332 PM CDT, a severe thunderstorm was located near Princeton, or 9
miles west of Berlin, moving east at 40 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...
Berlin, Princeton, Green Lake and Neshkoro. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 800 PM CDT for south central
Wisconsin.

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

&&

LAT...LON 4383 8925 4398 8925 4398 8889 4384 8889
TIME...MOT...LOC 2032Z 264DEG 33KT 4395 8914 

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

$$

STUMPF

695 
WWUS53 KMKX 112045
SVSMKX

Severe Weather Statement
National Weather Service Milwaukee/Sullivan WI
345 PM CDT Wed Aug 11 2021

WIC047-077-112055-
/O.CAN.KMKX.SV.W.0051.000000T0000Z-210811T2100Z/
Green Lake WI-Marquette WI-
345 PM CDT Wed Aug 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN GREEN LAKE AND
NORTHEASTERN MARQUETTE 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.

A Tornado Watch remains in effect until 800 PM CDT for south central
Wisconsin.

LAT...LON 4383 8925 4398 8925 4398 8889 4384 8889
TIME...MOT...LOC 2042Z 268DEG 38KT 4395 8895 

$$

STUMPF

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 10, 7:05 PM CDT	Special Weather Statement	MKX	Jefferson	25 min
Aug 10, 7:24 PM CDT	Severe Thunderstorm Warning	MKX	Sheboygan	51 min
Aug 10, 7:43 PM CDT	Severe Thunderstorm Warning	MKX	Kenosha, Milwaukee, Ozaukee, Racine	32 min
Aug 10, 8:07 PM CDT	Special Marine Warning	MKX		53 min
Aug 10, 8:16 PM CDT	Special Marine Warning	MKX		44 min
Aug 11, 6:44 AM CDT	Small Craft Advisory	MKX		15 hr
Aug 11, 9:58 AM CDT	Special Weather Statement	MKX	Kenosha, Milwaukee, Racine, Rock, Walworth	77 min
Aug 11, 10:06 AM CDT	Special Marine Warning	MKX		84 min
Aug 11, 4:22 PM CDT	Severe Thunderstorm Warning	MKX	Iowa	53 min
Aug 11, 5:05 PM CDT	Special Weather Statement	MKX	Iowa	25 min
Aug 11, 5:10 PM CDT	Severe Thunderstorm Warning	MKX	Iowa	50 min
Aug 11, 5:24 PM CDT	Special Weather Statement	MKX	Milwaukee	36 min
Aug 11, 5:49 PM CDT	Severe Thunderstorm Warning	MKX	Milwaukee, Waukesha	41 min
Aug 11, 5:56 PM CDT	Special Marine Warning	MKX		94 min
Aug 11, 5:58 PM CDT	Special Weather Statement	MKX	Iowa	47 min
Aug 11, 6:04 PM CDT	Tornado Warning	MKX	Iowa	41 min
Aug 11, 6:24 PM CDT	Severe Thunderstorm Warning	MKX	Kenosha, Racine, Walworth	53 min
Aug 11, 6:34 PM CDT	Tornado Warning	MKX	Dane	15 min
Aug 11, 6:48 PM CDT	Special Marine Warning	MKX		57 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.