Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 2, NWS La Crosse, WI

April 27, 2021Buffalo County, Jackson County, Trempealeau County, Wisconsin; Winona County, Minnesota

NWS La Crosse, WI issued this severe thunderstorm warning at Apr 27, 2021, 1:13 AM CDT for Buffalo County, Jackson County, Trempealeau County, Wisconsin; Winona County, Minnesota. It was in force for 47 min. 8 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, 1:13 AM CDT (06:13 UTC)
Expired: Apr 27, 2021, 2:00 AM CDT
In force: 47 min
Issued by: NWS La Crosse, WI
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

Counties Winona County, MN, Buffalo County, WI, Jackson County, WI, Trempealeau County, WI

The radar

The La Crosse radar (KARX), 31 km from the middle of the area, began a volume at 06:16 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, 1:15 AM CDT	HAIL 1	2 Nw Pickwick, MN
Apr 27, 1:20 AM CDT	HAIL 1.25	2 Se Winona, MN	REPORT FROM MPING: HALF DOLLAR (1.25 IN.).
Apr 27, 1:25 AM CDT	HAIL 1	2 S Winona, MN	HAIL COVERED THE GROUND.
Apr 27, 1:35 AM CDT	HAIL 1.25	Trempealeau, WI	RELAYED BY BROADCAST MEDIA - WKBT.
Apr 27, 1:35 AM CDT	HAIL 1.25	Trempealeau, WI	RELAYED VIA SOCIAL MEDIA.
Apr 27, 1:37 AM CDT	HAIL 0.75	Trempealeau, WI	REPORT FROM MPING: DIME (0.75 IN.).
Apr 27, 1:39 AM CDT	HAIL 0.75	2 Wsw Galesville, WI	REPORT FROM MPING: DIME (0.75 IN.).
Apr 27, 1:40 AM CDT	HAIL 1	Trempealeau, WI	REPORT FROM MPING: QUARTER (1.00 IN.).

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, 6.2 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: 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.

239 
WUUS53 KARX 270613
SVRARX
MNC169-WIC011-053-121-270700-
/O.NEW.KARX.SV.W.0002.210427T0613Z-210427T0700Z/

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

The National Weather Service in La Crosse has issued a

* Severe Thunderstorm Warning for...
  Central Winona County in southeastern Minnesota...
  Southeastern Buffalo County in west central Wisconsin...
  Southwestern Jackson County in west central Wisconsin...
  Southern Trempealeau County in west central Wisconsin...

* Until 200 AM CDT.

* At 112 AM CDT, a severe thunderstorm was located near Galesville,
  or 11 miles east of Winona, moving northeast at 40 mph.

  HAZARD...Quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Damage to vehicles is expected.

* This severe thunderstorm will be near...
  North Bend around 135 AM CDT.
  Blair around 140 AM CDT.

Other locations impacted by this severe thunderstorm include
Franklin, Melrose, Taylor, Beach Corners, Perrot State Park,
Marshland and Thimble Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4440 9104 4407 9097 4407 9115 4409 9119
      4405 9122 4407 9127 4407 9131 4403 9134
      4401 9134 4400 9133 4393 9168 4403 9174
TIME...MOT...LOC 0612Z 242DEG 34KT 4408 9144 

HAIL...1.00IN
WIND...<50MPH
 
$$

DAS

1 follow-up statement

549 
WWUS53 KARX 270632
SVSARX

Severe Weather Statement
National Weather Service La Crosse WI
132 AM CDT Tue Apr 27 2021

MNC169-WIC011-053-121-270700-
/O.CON.KARX.SV.W.0002.000000T0000Z-210427T0700Z/
Winona MN-Buffalo WI-Jackson WI-Trempealeau WI-
132 AM CDT Tue Apr 27 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 200 AM CDT
FOR EAST CENTRAL WINONA...SOUTHEASTERN BUFFALO...SOUTHWESTERN JACKSON
AND SOUTHERN TREMPEALEAU COUNTIES...

At 131 AM CDT, a severe thunderstorm was located near North Bend, or
14 miles south of Whitehall, moving northeast at 40 mph.

HAZARD...Ping pong ball size hail.

SOURCE...Radar indicated. Quarter size hail has been reported at 125 
         am in Winona. 

IMPACT...People and animals outdoors will be injured. Expect damage 
         to roofs, siding, windows, and vehicles.

This severe storm will be near...
  North Bend around 135 AM CDT.
  Blair around 140 AM CDT.

Other locations impacted by this severe thunderstorm include
Franklin, Melrose, Taylor, Beach Corners, Perrot State Park,
Marshland and Thimble Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4440 9104 4407 9097 4407 9115 4409 9119
      4405 9122 4407 9127 4407 9131 4403 9134
      4401 9134 4400 9133 4396 9153 4408 9165
TIME...MOT...LOC 0631Z 242DEG 34KT 4416 9122 

HAIL...1.50IN
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, 1:25 AM CDT	Special Weather Statement	ARX	La Crosse	20 min
Apr 27, 1:49 AM CDT	Severe Thunderstorm Warning	ARX	La Crosse	41 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
Apr 27, 3:56 PM CDT	Special Weather Statement	ARX	Dodge	64 min
Apr 27, 4:38 PM CDT	Special Weather Statement	ARX	Olmsted, Wabasha	52 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 2021 Severe Thunderstorm Warnings in Minnesota, 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.