Alert archive / Wisconsin / Tornado Warnings in 2021

Tornado Warning 16, NWS La Crosse, WI

August 27, 2021Grant County, Wisconsin

NWS La Crosse, WI issued this tornado warning at Aug 27, 2021, 8:59 PM CDT for Grant County, Wisconsin. It was in force for 31 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: Aug 27, 2021, 8:59 PM CDT (01:59 UTC)
Expired: Aug 27, 2021, 9:30 PM CDT
In force: 31 min
Issued by: NWS La Crosse, WI
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

County Grant County, WI

The radar

The La Crosse radar (KARX), 98 km from the middle of the area, began a volume at 02:03 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
Aug 27, 9:20 PM CDT	FUNNEL CLOUD	3 E Mount Hope, WI	FENNIMORE FIRE DEPT SAW A FUNNEL CLOUD BETWEEN MT HOPE AND MT IDA.
Aug 27, 9:20 PM CDT	FUNNEL CLOUD	3 E Mount Hope, WI	FUNNEL CLOUD BETWEEN MOUNT HOPE AND MT. IDA ON RICE ROAD REPORTED BY FENNIMORE FIRE DEPT.

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
Aug 27, 5:15 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 2.0 hours before the alert went out and 153 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: 995 J/kg
Mixed-layer CIN: -68 J/kg
Mixed-layer LCL: 1707 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 53 m²/s²
0-3 km storm-relative helicity: 148 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.3

Open this sounding in Storm Lab

The text

As transmitted.

922 
WFUS53 KARX 280159
TORARX
WIC043-280230-
/O.NEW.KARX.TO.W.0016.210828T0159Z-210828T0230Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service La Crosse WI
859 PM CDT Fri Aug 27 2021

The National Weather Service in La Crosse has issued a

* Tornado Warning for...
  West central Grant County in southwestern Wisconsin...

* Until 930 PM CDT.
    
* At 859 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Bloomington, or 10 miles southeast of Prairie Du
  Chien, moving east at 20 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.

* This tornadic thunderstorm will remain over mainly rural areas of
  west central Grant County, including the following locations...
  Patch Grove and Mount Hope.

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.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4293 9104 4298 9104 4302 9079 4293 9078
TIME...MOT...LOC 0159Z 261DEG 18KT 4296 9097 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...1.00 IN

$$

Skow

1 follow-up statement

676 
WWUS53 KARX 280221
SVSARX

Severe Weather Statement
National Weather Service La Crosse WI
921 PM CDT Fri Aug 27 2021

WIC043-280231-
/O.EXP.KARX.TO.W.0016.000000T0000Z-210828T0230Z/
Grant WI-
921 PM CDT Fri Aug 27 2021

...THE TORNADO WARNING FOR WEST CENTRAL GRANT COUNTY WILL EXPIRE AT
930 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.  However heavy rain
is still possible with this thunderstorm.

A Tornado Watch remains in effect until 1100 PM CDT for southwestern
Wisconsin.

LAT...LON 4293 9104 4298 9104 4302 9079 4293 9078
TIME...MOT...LOC 0221Z 261DEG 18KT 4298 9082 

$$

Skow

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 27, 7:38 PM CDT	Flash Flood Watch	ARX	Crawford, Richland, Vernon	18 hr
Aug 27, 8:03 PM CDT	Severe Thunderstorm Warning	ARX	Crawford, Grant	42 min
Aug 27, 8:48 PM CDT	Severe Thunderstorm Warning	ARX	Grant	42 min
Aug 27, 11:24 PM CDT	Special Weather Statement	ARX	Vernon	36 min
Aug 27, 11:31 PM CDT	Severe Thunderstorm Warning	ARX	Richland, Vernon	59 min
Aug 27, 11:41 PM CDT	Flash Flood Warning	ARX	Vernon	4 hr
Aug 27, 11:53 PM CDT	Severe Thunderstorm Warning	ARX	Richland	37 min
Aug 28, 1:40 AM CDT	Severe Thunderstorm Warning	ARX	Crawford, Richland	49 min
Aug 28, 3:15 AM CDT	River Flood Warning	ARX	La Crosse, Trempealeau	5 days
Aug 28, 4:14 AM CDT	River Flood Warning	ARX	Vernon	31 hr
Aug 28, 10:24 AM CDT	River Flood Warning	ARX	Crawford	4 days
Aug 28, 10:38 AM CDT	River Flood Watch	ARX	Juneau	22 hr
Aug 28, 10:46 AM CDT	River Flood Watch	ARX	Crawford	23 hr

Nearby

Tornado Warnings in Wisconsin, 2021 Every tornado warning in 2021 Tornadoes in 2021

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.