Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 105, NWS La Crosse, WI

September 20, 2021Adams County, Juneau County, Wisconsin

NWS La Crosse, WI issued this severe thunderstorm warning at Sep 20, 2021, 7:58 PM CDT for Adams County, Juneau County, Wisconsin. It was in force for 47 min. 4 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: Sep 20, 2021, 7:58 PM CDT (00:58 UTC)
Expired: Sep 20, 2021, 8:45 PM CDT
In force: 47 min
Issued by: NWS La Crosse, WI
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Adams County, WI, Juneau County, WI

The radar

The La Crosse radar (KARX), 111 km from the middle of the area, began a volume at 01:02 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.

What was reported inside it

Time	Report	Where	Remark
Sep 20, 8:10 PM CDT	TSTM WND DMG	5 Ne White Creek, WI	TREE DOWN NEAR 11TH AVE AND EDGEWOOD AVE JUNCTION.
Sep 20, 8:10 PM CDT	TSTM WND DMG	5 Ne White Creek, WI	TREE DOWN. NEAR 11TH AVE AND EDGEWOOD AVE JUNCTION.
Sep 20, 8:20 PM CDT	TSTM WND DMG	4 Ene Adams, WI	TREE DOWN. NEAR DEERBORN AVE AND 8TH AVE JUNCTION.
Sep 20, 8:20 PM CDT	TSTM WND DMG	4 Ene Adams, WI	TREES DOWN NEAR DEERBORN AVE AND 8TH AVE JUNCTION.

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 00:00Z, 1.0 hours before the alert went out and 156 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: 429 J/kg
Mixed-layer CIN: -23 J/kg
Mixed-layer LCL: 735 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 194 m²/s²
0-3 km storm-relative helicity: 212 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 2.0

Open this sounding in Storm Lab

The text

As transmitted.

518 
WUUS53 KARX 210058
SVRARX
WIC001-057-210145-
/O.NEW.KARX.SV.W.0105.210921T0058Z-210921T0145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service La Crosse WI
758 PM CDT Mon Sep 20 2021

The National Weather Service in La Crosse has issued a

* Severe Thunderstorm Warning for...
  Southeastern Juneau County in central Wisconsin...
  Adams County in central Wisconsin...

* Until 845 PM CDT.

* At 757 PM CDT, severe thunderstorms were located along a line
  extending from near New Lisbon to 7 miles north of Reedsburg,
  moving northeast at 60 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Severe thunderstorms will be near...
  Dellwood around 810 PM CDT.
  Friendship and Adams around 815 PM CDT.

Other locations impacted by these severe thunderstorms include County
Roads B And P, County Roads B And K, The Town Of Quincy, Highways 13
And 21, County Roads G And M, Stand Rock Campground and Big Spring.

This includes Interstate 90/94 between mile markers 82 and 86.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4364 8982 4387 8997 4393 9006 4412 8960
      4364 8960
TIME...MOT...LOC 0057Z 246DEG 51KT 4385 9015 4364 8995 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Skow

2 follow-up statements

876 
WWUS53 KARX 210129
SVSARX

Severe Weather Statement
National Weather Service La Crosse WI
829 PM CDT Mon Sep 20 2021

WIC057-210138-
/O.CAN.KARX.SV.W.0105.000000T0000Z-210921T0145Z/
Juneau WI-
829 PM CDT Mon Sep 20 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN JUNEAU COUNTY IS
CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

LAT...LON 4364 8975 4389 8987 4393 8990 4406 8960
      4364 8960
TIME...MOT...LOC 0128Z 246DEG 44KT 4405 8966 4370 8958 

$$

WIC001-210145-
/O.CON.KARX.SV.W.0105.000000T0000Z-210921T0145Z/
Adams WI-
829 PM CDT Mon Sep 20 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 845 PM CDT
FOR SOUTHEASTERN ADAMS COUNTY...

At 828 PM CDT, severe thunderstorms were located along a line
extending from 9 miles northeast of Friendship to 11 miles northeast
of Wisconsin Dells, moving northeast at 50 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

These severe thunderstorms will remain over mainly rural areas of
southeastern Adams County, including the following locations...
County Roads B And P, Brooks, K And L Campground, County Roads B And
K, Highway 23 And County G, County Roads A And B and County Roads G
And M.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4364 8975 4389 8987 4393 8990 4406 8960
      4364 8960
TIME...MOT...LOC 0128Z 246DEG 44KT 4405 8966 4370 8958 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Skow

490 
WWUS53 KARX 210136
SVSARX

Severe Weather Statement
National Weather Service La Crosse WI
836 PM CDT Mon Sep 20 2021

WIC001-210145-
/O.EXP.KARX.SV.W.0105.000000T0000Z-210921T0145Z/
Adams WI-
836 PM CDT Mon Sep 20 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN ADAMS COUNTY WILL
EXPIRE AT 845 PM CDT...
    
The storms which prompted the warning have weakened below severe
limits, and have exited the warned area. Therefore, the warning will
be allowed to expire.

LAT...LON 4364 8975 4389 8987 4393 8990 4406 8960
      4364 8960
TIME...MOT...LOC 0135Z 246DEG 51KT 4409 8953 4374 8945 

$$

Skow

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 20, 7:01 PM CDT	Special Weather Statement	ARX	Crawford, Grant, Juneau, Monroe, Richland, Vernon	44 min
Sep 20, 7:17 PM CDT	Tornado Warning	ARX	Richland, Vernon	28 min
Sep 20, 7:20 PM CDT	Severe Thunderstorm Warning	ARX	Crawford, Grant, Richland	40 min
Sep 20, 7:41 PM CDT	Severe Thunderstorm Warning	ARX	Juneau, Monroe, Richland, Vernon	34 min
Sep 20, 7:48 PM CDT	Special Weather Statement	ARX	Grant	27 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 2021 Every severe thunderstorm warning 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.