Alert archive / Wisconsin / Tornado Warnings in 2018

Tornado Warning 3, NWS Milwaukee, WI

May 9, 2018Washington County, Wisconsin

NWS Milwaukee, WI issued this tornado warning at May 9, 2018, 4:54 PM CDT for Washington County, Wisconsin. It was in force for 19 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: May 9, 2018, 4:54 PM CDT (21:54 UTC)
Expired: May 9, 2018, 5:13 PM CDT
In force: 19 min
Issued by: NWS Milwaukee, WI
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.0 in

County Washington County, WI

The radar

The Milwaukee radar (KMKX), 40 km from the middle of the area, began a volume at 21:53 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
May 9, 4:55 PM CDT	TORNADO	3 Sw Richfield, WI	PRELIMINARY DAMAGE RATING EF0 WITH PEAK WINDS ESTIMATED AT 80 MPH. PATH LENGTH, WIDTH, START AND END TIMES WILL BE DETERMINED SOMETIME THIS AFTERNOON.
May 9, 4:58 PM CDT	TORNADO	3 Sw Richfield, WI	CORRECTS TIME OF PREVIOUS TORNADO REPORT FROM 3 SW RICHFIELD. LOCATION NORTH OF HWY Q AND WEST OF HWY 164.

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, 9.9 hours before the alert went out and 139 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: 1724 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 71 m²/s²
0-3 km storm-relative helicity: 125 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

126 
WFUS53 KMKX 092154
TORMKX
WIC131-092230-
/O.NEW.KMKX.TO.W.0003.180509T2154Z-180509T2230Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Milwaukee/Sullivan WI
454 PM CDT WED MAY 9 2018

The National Weather Service in Milwaukee/Sullivan has issued a

* Tornado Warning for...
  Southeastern Washington County in southeastern Wisconsin...

* Until 530 PM CDT.
    
* At 454 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Merton, or 7 miles northwest of Sussex, moving
  east at 30 mph.

  HAZARD...Tornado.

  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.

* This tornadic thunderstorm will remain over mainly rural areas of
  southeastern Washington County, including the following
  locations... Richfield, Hubertus and Holy Hill.

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.

&&

LAT...LON 4320 8833 4324 8834 4333 8806 4320 8807
TIME...MOT...LOC 2154Z 255DEG 27KT 4322 8830 

TORNADO...RADAR INDICATED
HAIL...0.00IN

$$

MRC

2 follow-up statements

357 
WWUS53 KMKX 092206
SVSMKX

Severe Weather Statement
National Weather Service Milwaukee/Sullivan WI
506 PM CDT WED MAY 9 2018

WIC131-092230-
/O.CON.KMKX.TO.W.0003.000000T0000Z-180509T2230Z/
Washington WI-
506 PM CDT WED MAY 9 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 530 PM CDT FOR
SOUTHEASTERN WASHINGTON COUNTY...
    
At 504 PM CDT, a confirmed tornado was located near Jackson, moving
east at 30 mph.

HAZARD...Damaging tornado.

SOURCE...Weather spotters confirmed tornado. At 458 PM, a tornado 
         was reported just west of Hubertus by a trained spotter.

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.

Locations impacted include...
Richfield and Hubertus. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a tornado is on the ground. 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.

&&

LAT...LON 4321 8822 4325 8824 4333 8806 4320 8807
TIME...MOT...LOC 2204Z 255DEG 27KT 4324 8820 

TORNADO...OBSERVED
HAIL...0.00IN

$$

MRC

977 
WWUS53 KMKX 092213
SVSMKX

Severe Weather Statement
National Weather Service Milwaukee/Sullivan WI
513 PM CDT WED MAY 9 2018

WIC131-092223-
/O.CAN.KMKX.TO.W.0003.000000T0000Z-180509T2230Z/
Washington WI-
513 PM CDT WED MAY 9 2018

...THE TORNADO WARNING FOR SOUTHEASTERN WASHINGTON COUNTY IS
CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore, the warning has been cancelled.

LAT...LON 4321 8822 4325 8824 4333 8806 4320 8807
TIME...MOT...LOC 2211Z 255DEG 27KT 4326 8810 

$$

MRC

The office that day

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

Issued	Product	Office	Counties	Lasted
May 9, 2:18 PM CDT	Special Weather Statement	MKX	Washington	27 min
May 9, 2:33 PM CDT	Special Weather Statement	MKX	Sauk	42 min
May 9, 2:53 PM CDT	Special Weather Statement	MKX	Dane, Green, Rock	37 min
May 9, 3:28 PM CDT	Severe Thunderstorm Warning	MKX	Dane	32 min
May 9, 4:48 PM CDT	Special Marine Warning	MKX		57 min
May 9, 5:16 PM CDT	Special Weather Statement	MKX	Milwaukee	29 min
May 9, 5:18 PM CDT	Special Weather Statement	MKX	Walworth	27 min
May 9, 5:25 PM CDT	Special Marine Warning	MKX		65 min
May 9, 5:29 PM CDT	Severe Thunderstorm Warning	MKX	Milwaukee, Racine	16 min

Nearby

Tornado Warnings in Wisconsin, 2018 Every tornado warning in 2018 Tornadoes in 2018

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.