Alert archive / Wisconsin / Tornado Warnings in 2022

Tornado Warning 51, NWS Twin Cities, MN

July 31, 2022Pierce County, Saint Croix County, Wisconsin

NWS Twin Cities, MN issued this tornado warning at Jul 31, 2022, 9:23 PM CDT for Pierce County, Saint Croix County, Wisconsin. It was in force for 22 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 31, 2022, 9:23 PM CDT (02:23 UTC)
Expired: Jul 31, 2022, 9:45 PM CDT
In force: 22 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Pierce County, WI, Saint Croix County, WI

The radar

The Minneapolis radar (KMPX), 73 km from the middle of the area, began a volume at 02:23 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.

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 2.4 hours before the alert went out and 76 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: 1636 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 1070 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 192 m²/s²
0-3 km storm-relative helicity: 222 m²/s²
Significant tornado parameter: 1.3
Supercell composite: 8.1

Open this sounding in Storm Lab

The text

As transmitted.

565 
WFUS53 KMPX 010223
TORMPX
WIC093-109-010245-
/O.NEW.KMPX.TO.W.0051.220801T0223Z-220801T0245Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Twin Cities/Chanhassen MN
923 PM CDT Sun Jul 31 2022

The National Weather Service in the Twin Cities has issued a

* Tornado Warning for...
  North central Pierce County in west central Wisconsin...
  Southwestern St. Croix County in west central Wisconsin...

* Until 945 PM CDT.
    
* At 923 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near River Falls, 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 dangerous storm will be near...
  River Falls around 935 PM CDT.

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.

Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!

&&

LAT...LON 4477 9252 4488 9277 4489 9278 4492 9275
      4484 9247
TIME...MOT...LOC 0223Z 290DEG 27KT 4488 9270 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN

$$

ETA

1 follow-up statement

740 
WWUS53 KMPX 010235
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
935 PM CDT Sun Jul 31 2022

WIC093-109-010245-
/O.EXP.KMPX.TO.W.0051.000000T0000Z-220801T0245Z/
Pierce WI-St. Croix WI-
935 PM CDT Sun Jul 31 2022

...THE TORNADO WARNING FOR NORTH CENTRAL PIERCE AND SOUTHWESTERN ST.
CROIX COUNTIES WILL EXPIRE AT 945 PM CDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore, the warning will be allowed to expire.

LAT...LON 4477 9252 4488 9277 4489 9278 4492 9275
      4484 9247
TIME...MOT...LOC 0235Z 290DEG 27KT 4485 9258 

$$

ETA

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 31, 8:52 PM CDT	Special Weather Statement	MPX	Saint Croix	38 min
Jul 31, 9:10 PM CDT	Special Weather Statement	MPX	Barron, Polk	50 min

Nearby

Tornado Warnings in Wisconsin, 2022 Every tornado warning in 2022 Tornadoes in 2022

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.