Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 12, NWS Milwaukee, WI

July 28, 2021Fond du Lac County, Green Lake County, Marquette County, Wisconsin

NWS Milwaukee, WI issued this severe thunderstorm warning at Jul 28, 2021, 11:18 PM CDT for Fond du Lac County, Green Lake County, Marquette County, Wisconsin. It was in force for 72 min. 6 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, 11:18 PM CDT (04:18 UTC)
Expired: Jul 29, 2021, 12:30 AM CDT
In force: 72 min
Issued by: NWS Milwaukee, WI
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

Counties Fond du Lac County, WI, Green Lake County, WI, Marquette County, WI

The radar

The Green Bay radar (KGRB), 90 km from the middle of the area, began a volume at 04:18 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 28, 11:27 PM CDT	TSTM WND GST 45	Berlin, WI	SPOTTERS ESTIMATED WIND GUSTS OF 40 TO 50 MPH WITH STORM MOVING THROUGH BERLIN.
Jul 28, 11:37 PM CDT	TSTM WND DMG	3 Se Ripon, WI	HWY KK BETWEEN CALLAN RD AND BRANDON RD WAS CLOSED DUE TO SNAPPED POWER POLES. ALSO, THERE WAS SHEET METAL ROOFING OR SIDING STREWN IN THE FIELDS ON EITHER SIDE OF BRANDON RD JUST NORTH OF INTERSECTION WITH KK.
Jul 28, 11:43 PM CDT	TSTM WND DMG	Ripon, WI	REPORT OF MULTIPLE TREES DOWN IN RIPON. TIME ESTIMATED FROM RADAR.
Jul 28, 11:43 PM CDT	TSTM WND DMG	Ripon, WI	REPORTS OF MULTIPLE TREES DOWN IN RIPON. TIME ESTIMATED FROM RADAR.
Jul 28, 11:45 PM CDT	TSTM WND DMG	Ripon, WI	RELAYED FROM TMJ4 MULTIPLE POWER LINES AND POLES DOWN ACROSS RIPON. TIME ESTIMATED FROM RADAR.
Jul 28, 11:45 PM CDT	TSTM WND DMG	Ripon, WI	CITY OF RIPON POLICE DEPARTMENT REPORTS NUMEROUS DOWNED TREES AND ROAD CLOSURES CITY WIDE. POWER OUT CITY WIDE.

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, 4.3 hours before the alert went out and 89 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.

072 
WUUS53 KMKX 290418
SVRMKX
WIC039-047-077-290530-
/O.NEW.KMKX.SV.W.0012.210729T0418Z-210729T0530Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Milwaukee/Sullivan WI
1118 PM CDT Wed Jul 28 2021

The National Weather Service in Milwaukee/Sullivan has issued a

* Severe Thunderstorm Warning for...
  Green Lake County in south central Wisconsin...
  Fond du Lac County in east central Wisconsin...
  Marquette County in south central Wisconsin...

* Until 1230 AM CDT.

* At 1118 PM CDT, severe thunderstorms were located along a line
  extending from 8 miles west of Menasha to near Redgranite to 8
  miles south of Lake Wazeecha, moving southeast at 45 mph.

  HAZARD...60 mph wind gusts and penny size hail.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Fond Du Lac, Waupun, Ripon, Berlin, North Fond Du Lac,
  Campbellsport, Montello, Markesan, Westfield, Princeton, Oakfield,
  Rosendale, Green Lake, Brandon, Southern Lake Winnebago, Lawrence,
  Taycheedah, Ashford, Lamartine and Byron.

People attending Fond du Lac Airport should seek safe shelter
immediately!

This includes the following Location Puckaway Lake.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4390 8888 4389 8841 4394 8840 4394 8817
      4354 8816 4354 8840 4363 8841 4364 8960
      4398 8960 4398 8889
TIME...MOT...LOC 0418Z 318DEG 39KT 4422 8860 4409 8906 4426 8972 

TORNADO...POSSIBLE
HAIL...0.75IN
WIND...60MPH
 
$$

HANSEN

1 follow-up statement

826 
WWUS53 KMKX 290444
SVSMKX

Severe Weather Statement
National Weather Service Milwaukee/Sullivan WI
1144 PM CDT Wed Jul 28 2021

WIC039-047-077-290530-
/O.CON.KMKX.SV.W.0012.000000T0000Z-210729T0530Z/
Green Lake WI-Fond du Lac WI-Marquette WI-
1144 PM CDT Wed Jul 28 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1230 AM CDT
FOR GREEN LAKE...FOND DU LAC AND MARQUETTE COUNTIES...

At 1143 PM CDT, severe thunderstorms were located along a line
extending from near Southern Lake Winnebago to near Ripon to 6 miles
north of Westfield, moving southeast at 55 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...
Fond Du Lac, Waupun, Ripon, Berlin, North Fond Du Lac, Campbellsport,
Montello, Markesan, Westfield, Princeton, Oakfield, Rosendale, Green
Lake, Brandon, Southern Lake Winnebago, Lawrence, Taycheedah,
Ashford, Lamartine and Byron.

People attending Fond du Lac Airport should seek safe shelter
immediately!

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4390 8888 4389 8841 4394 8840 4394 8817
      4354 8816 4354 8840 4363 8841 4364 8960
      4398 8960 4398 8889
TIME...MOT...LOC 0443Z 329DEG 49KT 4394 8838 4381 8884 4398 8949 

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

HANSEN

The office that day

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

Issued	Product	Office	Counties	Lasted
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, 12:45 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.