Alert archive / Wisconsin / Tornado Warnings in 2017

Tornado Warning 20, NWS Twin Cities, MN

June 28, 2017Pierce County, Saint Croix County, Wisconsin

NWS Twin Cities, MN issued this tornado warning at Jun 28, 2017, 4:30 PM CDT for Pierce County, Saint Croix County, Wisconsin. It was in force for 32 min. 3 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: Jun 28, 2017, 4:30 PM CDT (21:30 UTC)
Expired: Jun 28, 2017, 5:02 PM CDT
In force: 32 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.25 in

Counties Pierce County, WI, Saint Croix County, WI

The radar

The Minneapolis radar (KMPX), 95 km from the middle of the area, began a volume at 21:29 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
Jun 28, 4:31 PM CDT	TORNADO	6 Nne Ellsworth, WI	0.25 MILE SOUTH OF 650TH STREET AND 780TH AVE...HALF A HOME DESTROYED...TREES DOWN.
Jun 28, 4:44 PM CDT	TORNADO	4 Wsw Spring Valley, WI	CORRECTED AMENDED UPDATED...MULTIPLE TREES AND POWER LINES DOWN...SIGNIFICANT DAMAGE TO HOUSES.
Jun 28, 4:44 PM CDT	TORNADO	4 Wsw Spring Valley, WI

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
Jun 28, 4:09 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 9.5 hours before the alert went out and 97 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: 6 J/kg
Mixed-layer CIN: -111 J/kg
Mixed-layer LCL: 537 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 511 m²/s²
0-3 km storm-relative helicity: 568 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

257 
WFUS53 KMPX 282130
TORMPX
WIC093-109-282215-
/O.NEW.KMPX.TO.W.0020.170628T2130Z-170628T2215Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Twin Cities/Chanhassen MN
430 PM CDT WED JUN 28 2017

The National Weather Service in The Twin Cities has issued a

* Tornado Warning for...
  Northeastern Pierce County in west central Wisconsin...
  Southeastern St. Croix County in west central Wisconsin...

* Until 515 PM CDT
    
* At 429 PM CDT, a severe thunderstorm capable of producing a tornado
  was located over Martel, or 8 miles east of River Falls, moving
  east at 25 mph.

  HAZARD...Tornado and half dollar 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. 

* This dangerous storm will be near...
  Elmwood around 500 PM CDT. 

Other locations impacted by this tornadic thunderstorm include Martel
and Wilson.

This includes Interstate 94 in Wisconsin between mile markers 25 and
31.
 
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 4478 9251 4489 9253 4496 9214 4478 9213
TIME...MOT...LOC 2129Z 258DEG 24KT 4483 9245 

TORNADO...RADAR INDICATED
HAIL...1.25IN

$$

3 follow-up statements

868 
WWUS53 KMPX 282137
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
437 PM CDT WED JUN 28 2017

WIC093-109-282215-
/O.CON.KMPX.TO.W.0020.000000T0000Z-170628T2215Z/
Pierce WI-St. Croix WI-
437 PM CDT WED JUN 28 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 515 PM CDT FOR
NORTHEASTERN PIERCE AND SOUTHEASTERN ST. CROIX COUNTIES...
        
At 436 PM CDT, a confirmed tornado was located over Martel, or 11
miles east of River Falls, moving east at 30 mph.

HAZARD...Damaging tornado and half dollar size hail. 

SOURCE...Radar confirmed tornado. 

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 tornado will be near...
  Elmwood around 500 PM CDT. 

Doppler radar is showing a tornado on the ground in the Martel area 
and moving east toward the northeast corner of Pierce county to the 
north of Elmwood.

Other locations impacted by this tornadic thunderstorm include Martel
and Wilson.

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 4478 9242 4489 9244 4496 9214 4478 9213
TIME...MOT...LOC 2136Z 258DEG 24KT 4484 9238 

TORNADO...OBSERVED
HAIL...1.25IN

$$

596 
WWUS53 KMPX 282145
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
445 PM CDT WED JUN 28 2017

WIC093-109-282215-
/O.CON.KMPX.TO.W.0020.000000T0000Z-170628T2215Z/
Pierce WI-St. Croix WI-
445 PM CDT WED JUN 28 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 515 PM CDT FOR
NORTHEASTERN PIERCE AND SOUTHEASTERN ST. CROIX COUNTIES...
    
At 445 PM CDT, a confirmed tornado was located near El Paso, or 16
miles east of River Falls, moving east at 30 mph.

HAZARD...Damaging tornado and quarter size hail. 

SOURCE...Law enforcement confirmed tornado. 

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 tornado will be near...
  Elmwood around 455 PM CDT. 

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.

This tornado will be passing between Spring Valley and Elmwood.

&&

LAT...LON 4478 9233 4488 9235 4490 9214 4478 9213
TIME...MOT...LOC 2145Z 270DEG 27KT 4482 9228 

TORNADO...OBSERVED
HAIL...1.00IN

$$

MPG

027 
WWUS53 KMPX 282202
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
502 PM CDT WED JUN 28 2017

WIC093-109-282212-
/O.CAN.KMPX.TO.W.0020.000000T0000Z-170628T2215Z/
Pierce WI-St. Croix WI-
502 PM CDT WED JUN 28 2017

...THE TORNADO WARNING FOR NORTHEASTERN PIERCE AND SOUTHEASTERN ST.
CROIX COUNTIES IS CANCELLED...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning has
been cancelled.

A tornado watch remains in effect until 1000 PM CDT for west central
Wisconsin.

LAT...LON 4478 9233 4488 9235 4490 9214 4478 9213
TIME...MOT...LOC 2201Z 258DEG 24KT 4484 9212 

$$

The office that day

Everything else NWS Twin Cities, MN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 28, 2:41 PM CDT	Special Weather Statement	MPX	Pierce	34 min
Jun 28, 4:06 PM CDT	Severe Thunderstorm Warning	MPX	Pierce	24 min
Jun 28, 4:12 PM CDT	Special Weather Statement	MPX	Saint Croix	33 min
Jun 28, 4:23 PM CDT	Severe Thunderstorm Warning	MPX	Pierce, Saint Croix	40 min
Jun 28, 4:59 PM CDT	Severe Thunderstorm Warning	MPX	Dunn, Pepin, Pierce	46 min
Jun 28, 5:12 PM CDT	Special Weather Statement	MPX	Saint Croix	63 min

Nearby

Tornado Warnings in Wisconsin, 2017 Every tornado warning in 2017 Tornadoes in 2017

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.