Alert archive / Wisconsin / Tornado Warnings in 2019

Tornado Warning 59, NWS Twin Cities, MN

September 24, 2019Eau Claire County, Wisconsin

NWS Twin Cities, MN issued this tornado warning at Sep 24, 2019, 8:59 PM CDT for Eau Claire County, Wisconsin. It was in force for 11 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: Sep 24, 2019, 8:59 PM CDT (01:59 UTC)
Expired: Sep 24, 2019, 9:10 PM CDT
In force: 11 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

County Eau Claire County, WI

The radar

The La Crosse radar (KARX), 101 km from the middle of the area, began a volume at 02:02 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Sep 24, 4:43 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 2.0 hours before the alert went out and 202 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: 1764 J/kg
Mixed-layer CIN: -32 J/kg
Mixed-layer LCL: 1238 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 113 m²/s²
0-3 km storm-relative helicity: 158 m²/s²
Significant tornado parameter: 1.5
Supercell composite: 10.5

Open this sounding in Storm Lab

The text

As transmitted.

237 
WFUS53 KMPX 250159
TORMPX
WIC035-250230-
/O.NEW.KMPX.TO.W.0059.190925T0159Z-190925T0230Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Twin Cities/Chanhassen MN
859 PM CDT Tue Sep 24 2019

The National Weather Service in The Twin Cities has issued a

* Tornado Warning for...
  Eastern Eau Claire County in west central Wisconsin...

* Until 930 PM CDT.
    
* At 859 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Augusta, or 21 miles southeast of Eau Claire,
  moving northeast at 45 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
  eastern Eau Claire County, including the following locations...
  Lake Eau Claire County Park.

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 4460 9110 4473 9124 4486 9101 4486 9092
      4470 9092
TIME...MOT...LOC 0159Z 225DEG 40KT 4473 9106 

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

$$

BORGHOFF

1 follow-up statement

990 
WWUS53 KMPX 250210
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
910 PM CDT Tue Sep 24 2019

WIC035-250219-
/O.CAN.KMPX.TO.W.0059.000000T0000Z-190925T0230Z/
Eau Claire WI-
910 PM CDT Tue Sep 24 2019

...THE TORNADO WARNING FOR EASTERN EAU CLAIRE COUNTY 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 midnight CDT for west central
Wisconsin.

LAT...LON 4460 9110 4473 9124 4486 9101 4486 9092
      4470 9092
TIME...MOT...LOC 0208Z 225DEG 40KT 4480 9096 

$$

BORGHOFF

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 24, 7:03 PM CDT	Tornado Warning	MPX	Saint Croix	27 min
Sep 24, 7:46 PM CDT	Tornado Warning	MPX	Chippewa, Dunn	29 min
Sep 24, 8:23 PM CDT	Tornado Warning	MPX	Chippewa	37 min

Nearby

Tornado Warnings in Wisconsin, 2019 Every tornado warning in 2019 Tornadoes in 2019

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.