Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 3, NWS La Crosse, WI

April 27, 2021La Crosse County, Wisconsin

NWS La Crosse, WI issued this severe thunderstorm warning at Apr 27, 2021, 1:49 AM CDT for La Crosse County, Wisconsin. It was in force for 41 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: Apr 27, 2021, 1:49 AM CDT (06:49 UTC)
Expired: Apr 27, 2021, 2:30 AM CDT
In force: 41 min
Issued by: NWS La Crosse, WI
Area: Storm-based polygon
Hail: 1.25 in
Wind: 50.0 mph

County La Crosse County, WI

The radar

The La Crosse radar (KARX), 24 km from the middle of the area, began a volume at 06:49 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
Apr 27, 2:01 AM CDT	HAIL 0.7	4 Ne New Amsterdam, WI	A LOT OF DIME-SIZED HAIL.
Apr 27, 2:05 AM CDT	HAIL 0.75	4 Ne New Amsterdam, WI

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 6.8 hours before the alert went out and 210 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 828 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 397 m²/s²
0-3 km storm-relative helicity: 378 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

125 
WUUS53 KARX 270649
SVRARX
WIC063-270730-
/O.NEW.KARX.SV.W.0003.210427T0649Z-210427T0730Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service La Crosse WI
149 AM CDT Tue Apr 27 2021

The National Weather Service in La Crosse has issued a

* Severe Thunderstorm Warning for...
  Northern La Crosse County in west central Wisconsin...

* Until 230 AM CDT.

* At 148 AM CDT, a severe thunderstorm was located near New 
  Amsterdam, or 13 miles north of La Crosse, moving east at 30 mph.

  HAZARD...Half dollar size hail.

  SOURCE...Radar indicated.

  IMPACT...Damage to vehicles is expected.

* This severe thunderstorm will remain over mainly rural areas of
  northern La Crosse County, including the following locations...
  Severson Coulee, Mindoro, Camp Decorah, New Amsterdam, Stevenstown,
  Highway 162 And County T and Council Bay.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm is producing large hail. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows!

&&

LAT...LON 4398 9135 4399 9132 4402 9134 4403 9134
      4407 9131 4406 9128 4407 9127 4406 9125
      4405 9122 4409 9120 4409 9117 4407 9115
      4407 9092 4401 9091 4398 9091
TIME...MOT...LOC 0648Z 257DEG 13KT 4403 9128 

HAIL...1.25IN
WIND...<50MPH
 
$$

DAS

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 27, 12:26 AM CDT	Severe Thunderstorm Warning	ARX	Buffalo, Trempealeau	49 min
Apr 27, 1:13 AM CDT	Severe Thunderstorm Warning	ARX	Buffalo, Jackson, Trempealeau	47 min
Apr 27, 1:25 AM CDT	Special Weather Statement	ARX	La Crosse	20 min
Apr 27, 2:16 AM CDT	Special Weather Statement	ARX	Jackson	59 min
Apr 27, 2:33 AM CDT	Special Weather Statement	ARX	Buffalo, Trempealeau	57 min
Apr 27, 3:24 AM CDT	Special Weather Statement	ARX	Adams	36 min
Apr 27, 3:44 AM CDT	Special Weather Statement	ARX	Clark	46 min
Apr 27, 4:35 AM CDT	Special Weather Statement	ARX	Taylor	40 min
Apr 27, 5:20 PM CDT	Special Weather Statement	ARX	Trempealeau	55 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.