Alert archive / Wisconsin / Tornado Warnings in 2020

Tornado Warning 12, NWS Milwaukee, WI

November 10, 2020Racine County, Walworth County, Wisconsin

NWS Milwaukee, WI issued this tornado warning at Nov 10, 2020, 4:21 PM CST for Racine County, Walworth County, Wisconsin. It was in force for 24 min. 4 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: Nov 10, 2020, 4:21 PM CST (22:21 UTC)
Expired: Nov 10, 2020, 4:45 PM CST
In force: 24 min
Issued by: NWS Milwaukee, WI
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

Counties Racine County, WI, Walworth County, WI

The radar

The Milwaukee radar (KMKX), 34 km from the middle of the area, began a volume at 22:21 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
Nov 10, 4:21 PM CST	TSTM WND DMG	4 Nne Lake Geneva, WI	REPORT OF MULTIPLE TREES DOWN AND A TREE ON A HOUSE IN SPRINGFIELD. TIME ESTIMATED FROM RADAR.
Nov 10, 4:25 PM CST	TSTM WND DMG	7 W Burlington, WI	DELAYED REPORT: MULTIPLE LARGE TREES SNAPPED IN SPRING PRAIRIE. TIME ESTIMATED BASED ON RADAR.
Nov 10, 4:30 PM CST	TSTM WND DMG	1 Wsw Burlington, WI	MULTIPLE TREES DOWN AT STATE STREET AND OAKLAND AVENUE. TIME ESTIMATED FROM RADAR.
Nov 10, 4:33 PM CST	TSTM WND DMG	Rochester, WI	MULTIPLE REPORTS OF TREES ON ROADWAYS AND POWER POLES SNAPPED. TIME ESTIMATED FROM RADAR.

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
Nov 10, 2:05 PM CST	Tornado Watch	SPC	6 hr

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 10.4 hours before the alert went out and 199 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: 499 m above ground
0-6 km bulk shear: 73 kt
0-1 km storm-relative helicity: -81 m²/s²
0-3 km storm-relative helicity: 204 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

105 
WFUS53 KMKX 102221
TORMKX
WIC101-127-102245-
/O.NEW.KMKX.TO.W.0012.201110T2221Z-201110T2245Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Milwaukee/Sullivan WI
421 PM CST Tue Nov 10 2020

The National Weather Service in Milwaukee/Sullivan has issued a

* Tornado Warning for...
  Northeastern Walworth County in southeastern Wisconsin...
  Western Racine County in southeastern Wisconsin...

* Until 445 PM CST.

* At 420 PM CST, severe thunderstorms capable of producing both
  tornadoes and extensive straight line wind damage were located near
  Lake Geneva, moving northeast at 65 mph.

  HAZARD...Tornado and quarter size hail.

  SOURCE...Radar indicated rotation.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely.

* These dangerous storms will be near...
  East Troy and Browns Lake around 425 PM CST.
  Rochester and Potter Lake around 430 PM CST.
  Waterford North around 435 PM CST.
  Wind Lake around 440 PM CST.

Other locations impacted by this tornadic thunderstorm include Honey
Creek, Waterford, Springfield and Burlington.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

This cluster of thunderstorms is capable of producing tornadoes and
widespread significant wind damage. Do not wait to see or hear the
tornado. For your protection move to an interior room on the lowest
floor of a building.

&&

LAT...LON 4274 8852 4284 8841 4284 8818 4261 8819
      4261 8830 4260 8830 4259 8848
TIME...MOT...LOC 2220Z 225DEG 55KT 4268 8840 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

WAGNER

The office that day

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

Issued	Product	Office	Counties	Lasted
Nov 10, 3:09 AM CST	Wind Advisory	MKX	Columbia, Dane, Dodge, Fond du Lac, Green, Green Lake and 14 more	25 hr
Nov 10, 2:58 PM CST	Special Weather Statement	MKX	Fond du Lac	62 min
Nov 10, 3:38 PM CST	Severe Thunderstorm Warning	MKX	Rock, Walworth	82 min
Nov 10, 4:16 PM CST	Severe Thunderstorm Warning	MKX	Kenosha, Racine	74 min
Nov 10, 4:17 PM CST	Severe Thunderstorm Warning	MKX	Jefferson, Waukesha	44 min
Nov 10, 4:35 PM CST	Severe Thunderstorm Warning	MKX	Milwaukee	38 min
Nov 10, 4:37 PM CST	Special Marine Warning	MKX		113 min
Nov 10, 4:59 PM CST	Special Marine Warning	MKX		61 min
Nov 10, 5:10 PM CST	Tornado Warning	MKX	Kenosha	20 min

Nearby

Tornado Warnings in Wisconsin, 2020 Every tornado warning in 2020 Tornadoes 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.