Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 21, NWS Milwaukee, WI

June 10, 2020Washington County, Waukesha County, Wisconsin

NWS Milwaukee, WI issued this severe thunderstorm warning at Jun 10, 2020, 1:22 PM CDT for Washington County, Waukesha County, Wisconsin. It was in force for 38 min. 1 report 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: Jun 10, 2020, 1:22 PM CDT (18:22 UTC)
Expired: Jun 10, 2020, 2:00 PM CDT
In force: 38 min
Issued by: NWS Milwaukee, WI
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Washington County, WI, Waukesha County, WI

The radar

The Milwaukee radar (KMKX), 31 km from the middle of the area, began a volume at 18:22 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
Jun 10, 1:24 PM CDT	HAIL 1	1 Ne Merton, 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, 6.4 hours before the alert went out and 144 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: 867 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: -150 m²/s²
0-3 km storm-relative helicity: -31 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

104 
WUUS53 KMKX 101822
SVRMKX
WIC131-133-101900-
/O.NEW.KMKX.SV.W.0021.200610T1822Z-200610T1900Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Milwaukee/Sullivan WI
122 PM CDT Wed Jun 10 2020

The National Weather Service in Milwaukee/Sullivan has issued a

* Severe Thunderstorm Warning for...
  North central Waukesha County in southeastern Wisconsin...
  Southern Washington County in southeastern Wisconsin...

* Until 200 PM CDT.

* At 121 PM CDT, a severe thunderstorm was located near Merton, or
  near Sussex, moving northeast at 30 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...
  Hartland, Jackson, Slinger, Merton, Richfield, Chenequa, Colgate,
  Hubertus, North Lake and Holy Hill.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4309 8836 4319 8845 4320 8844 4320 8842
      4322 8842 4338 8824 4323 8806
TIME...MOT...LOC 1821Z 223DEG 28KT 4319 8829 

HAIL...1.00IN
WIND...60MPH
 
$$

HANSEN

2 follow-up statements

805 
WWUS53 KMKX 101834
SVSMKX

Severe Weather Statement
National Weather Service Milwaukee/Sullivan WI
134 PM CDT Wed Jun 10 2020

WIC131-133-101900-
/O.CON.KMKX.SV.W.0021.000000T0000Z-200610T1900Z/
Waukesha WI-Washington WI-
134 PM CDT Wed Jun 10 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 200 PM CDT
FOR NORTH CENTRAL WAUKESHA AND SOUTHERN WASHINGTON COUNTIES...

At 134 PM CDT, a severe thunderstorm was located over Jackson, moving
northeast 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...
Jackson, Slinger, Richfield, Hubertus, Colgate and Holy Hill. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4314 8825 4324 8840 4338 8824 4323 8806
TIME...MOT...LOC 1834Z 222DEG 36KT 4329 8817 

HAIL...1.00IN
WIND...60MPH
 
$$

HANSEN

923 
WWUS53 KMKX 101850
SVSMKX

Severe Weather Statement
National Weather Service Milwaukee/Sullivan WI
150 PM CDT Wed Jun 10 2020

WIC131-133-101900-
/O.EXP.KMKX.SV.W.0021.000000T0000Z-200610T1900Z/
Waukesha WI-Washington WI-
150 PM CDT Wed Jun 10 2020

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL WAUKESHA AND
SOUTHERN WASHINGTON COUNTIES WILL EXPIRE AT 200 PM CDT...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will
be allowed to expire.

LAT...LON 4314 8825 4324 8840 4338 8824 4323 8806
TIME...MOT...LOC 1850Z 223DEG 28KT 4337 8806 

$$

HANSEN

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 10, 1:17 PM CDT	Special Weather Statement	MKX	Waukesha	28 min
Jun 10, 1:48 PM CDT	Special Weather Statement	MKX	Washington	27 min
Jun 10, 1:53 PM CDT	Special Marine Warning	MKX		63 min
Jun 10, 4:19 PM CDT	Areal Flood Advisory	MKX	Columbia, Dodge	116 min
Jun 10, 4:43 PM CDT	Flash Flood Warning	MKX	Fond du Lac	3 hr
Jun 10, 5:27 PM CDT	Special Marine Warning	MKX		33 min
Jun 10, 6:04 PM CDT	Areal Flood Advisory	MKX	Milwaukee	116 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 2020 Every severe thunderstorm warning in 2020

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.