Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 61, NWS Milwaukee, WI

August 27, 2021Columbia County, Dane County, Sauk County, Wisconsin

NWS Milwaukee, WI issued this severe thunderstorm warning at Aug 27, 2021, 9:27 AM CDT for Columbia County, Dane County, Sauk County, Wisconsin. It was in force for 48 min. 2 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: Aug 27, 2021, 9:27 AM CDT (14:27 UTC)
Expired: Aug 27, 2021, 10:15 AM CDT
In force: 48 min
Issued by: NWS Milwaukee, WI
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

Counties Columbia County, WI, Dane County, WI, Sauk County, WI

The radar

The Milwaukee radar (KMKX), 92 km from the middle of the area, began a volume at 14:29 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
Aug 27, 9:35 AM CDT	TSTM WND DMG	4 Nne Cross Plains, WI	TREE SNAPPED OFF AT BASE.
Aug 27, 9:41 AM CDT	HAIL 0.75	5 Nne Cross Plains, WI

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 2.5 hours before the alert went out and 174 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 733 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 112 m²/s²
0-3 km storm-relative helicity: 135 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

973 
WUUS53 KMKX 271427
SVRMKX
WIC021-025-111-271515-
/O.NEW.KMKX.SV.W.0061.210827T1427Z-210827T1515Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Milwaukee/Sullivan WI
927 AM CDT Fri Aug 27 2021

The National Weather Service in Milwaukee/Sullivan has issued a

* Severe Thunderstorm Warning for...
  Southwestern Columbia County in south central Wisconsin...
  Northwestern Dane County in south central Wisconsin...
  East central Sauk County in south central Wisconsin...

* Until 1015 AM CDT.

* At 927 AM CDT, severe thunderstorms were located along a line
  extending from near Prairie Du Sac to near Black Earth, moving east
  at 35 mph.

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

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Madison, Sun Prairie, Middleton, Waunakee, Windsor, Lake Wisconsin,
  Deforest, Cross Plains, Lodi, Poynette, Maple Bluff, Dane,
  Arlington, Merrimac, Harmony Grove, Morrisonville, Pine Bluff,
  Token Creek, Interstate 90/94 Interchange and Okee.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4354 8937 4313 8923 4305 8969 4329 8971
      4330 8973 4333 8971 4344 8972
TIME...MOT...LOC 1427Z 254DEG 32KT 4334 8982 4308 8975 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

HANSEN

2 follow-up statements

858 
WWUS53 KMKX 271449
SVSMKX

Severe Weather Statement
National Weather Service Milwaukee/Sullivan WI
949 AM CDT Fri Aug 27 2021

WIC021-025-111-271515-
/O.CON.KMKX.SV.W.0061.000000T0000Z-210827T1515Z/
Columbia WI-Dane WI-Sauk WI-
949 AM CDT Fri Aug 27 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1015 AM CDT
FOR SOUTHWESTERN COLUMBIA...NORTH CENTRAL DANE AND EAST CENTRAL SAUK
COUNTIES...

At 949 AM CDT, severe thunderstorms were located along a line
extending from Lake Wisconsin to near Middleton, moving east at 35
mph.

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

SOURCE...Radar indicated.

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

Locations impacted include...
Sun Prairie, Waunakee, Windsor, Lake Wisconsin, Deforest, Lodi,
Poynette, Dane, Arlington, Merrimac, Harmony Grove, Morrisonville,
Token Creek, Interstate 90/94 Interchange and Okee.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4316 8924 4314 8957 4345 8969 4354 8937
TIME...MOT...LOC 1449Z 254DEG 30KT 4340 8956 4314 8949 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

HANSEN

154 
WWUS53 KMKX 271509
SVSMKX

Severe Weather Statement
National Weather Service Milwaukee/Sullivan WI
1009 AM CDT Fri Aug 27 2021

WIC021-025-111-271519-
/O.EXP.KMKX.SV.W.0061.000000T0000Z-210827T1515Z/
Columbia WI-Dane WI-Sauk WI-
1009 AM CDT Fri Aug 27 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN COLUMBIA...NORTH
CENTRAL DANE AND EAST CENTRAL SAUK COUNTIES WILL EXPIRE AT 1015 AM
CDT...
    
The storms which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire.

LAT...LON 4316 8924 4314 8957 4345 8969 4354 8937
TIME...MOT...LOC 1509Z 254DEG 32KT 4344 8934 4318 8928 

$$

HANSEN

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 27, 8:57 AM CDT	Severe Thunderstorm Warning	MKX	Dane, Iowa, Sauk	48 min
Aug 27, 9:02 AM CDT	Special Weather Statement	MKX	Dodge	43 min
Aug 27, 10:05 AM CDT	Areal Flood Advisory	MKX	Columbia, Sauk	75 min
Aug 27, 10:08 AM CDT	Special Weather Statement	MKX	Columbia	52 min
Aug 27, 10:47 AM CDT	Special Weather Statement	MKX	Dodge, Fond du Lac	43 min
Aug 27, 11:19 AM CDT	Special Weather Statement	MKX	Fond du Lac	41 min
Aug 27, 11:59 AM CDT	Special Weather Statement	MKX	Sheboygan	31 min
Aug 27, 2:46 PM CDT	Special Weather Statement	MKX	Fond du Lac	44 min
Aug 27, 3:24 PM CDT	Special Weather Statement	MKX	Sheboygan	51 min
Aug 27, 4:01 PM CDT	Special Weather Statement	MKX	Dodge	59 min
Aug 27, 4:07 PM CDT	Severe Thunderstorm Warning	MKX	Sheboygan	26 min
Aug 27, 4:09 PM CDT	Special Marine Warning	MKX		66 min
Aug 27, 4:35 PM CDT	Special Weather Statement	MKX	Washington	25 min
Aug 27, 4:44 PM CDT	Severe Thunderstorm Warning	MKX	Dodge, Washington	46 min
Aug 27, 5:28 PM CDT	Special Weather Statement	MKX	Washington	47 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.