Alert archive / Wisconsin / Special Weather Statements in 2021

Special Weather Statement, NWS La Crosse, WI

August 7, 2021Vernon County, Wisconsin

NWS La Crosse, WI issued this special weather statement at Aug 7, 2021, 3:17 PM CDT for Vernon County, Wisconsin. It was in force for 73 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 7, 2021, 3:17 PM CDT (20:17 UTC)
Expired: Aug 7, 2021, 4:30 PM CDT
In force: 73 min
Issued by: NWS La Crosse, WI
Hail: 0.88 in
Wind: 40

County Vernon County, WI

The radar

The La Crosse radar (KARX), 51 km from the middle of the area, began a volume at 20:16 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
Aug 7, 3:38 PM CDT	HAIL 0.75	Ontario, WI	RELAYED BY DISPATCH.
Aug 7, 3:39 PM CDT	HAIL 0.88	4 Se Cashton, WI

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 12:00Z, 8.3 hours before the alert went out and 217 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: 20 J/kg
Mixed-layer CIN: -32 J/kg
Mixed-layer LCL: 656 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 72 m²/s²
0-3 km storm-relative helicity: 103 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

725 
WWUS83 KARX 072017
SPSARX

Special Weather Statement
National Weather Service La Crosse WI
317 PM CDT Sat Aug 7 2021
 
WIZ042-053-072130-
Vernon WI-Monroe WI-
317 PM CDT Sat Aug 7 2021

...A strong thunderstorm will impact portions of northeastern Vernon
and southern Monroe Counties through 430 PM CDT...

At 317 PM CDT, Doppler radar was tracking a strong thunderstorm over
Cashton, or 12 miles south of Sparta, moving east at 25 mph.

HAZARD...Winds in excess of 40 mph and nickel size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around 
         unsecured objects. Minor damage to outdoor objects is 
         possible.

Locations impacted include...
Westby, Hillsboro, Cashton, Glendale, Portland, Norwalk, Ontario,
Wilton, Kendall, Melvina, Wildcat Mountain State Park, Jersey Valley
County Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building. 

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

&&

LAT...LON 4355 9037 4368 9092 4373 9091 4386 9090
      4388 9032 4355 9031
TIME...MOT...LOC 2017Z 272DEG 20KT 4377 9081 

MAX HAIL SIZE...0.88 IN
MAX WIND GUST...40 MPH

$$

Rieck

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 7, 6:26 AM CDT	Special Weather Statement	ARX	Buffalo	34 min
Aug 7, 7:40 AM CDT	Special Weather Statement	ARX	La Crosse	35 min
Aug 7, 9:17 AM CDT	Special Weather Statement	ARX	Juneau	28 min
Aug 7, 10:12 AM CDT	Special Weather Statement	ARX	Adams	33 min
Aug 7, 11:17 AM CDT	Special Weather Statement	ARX	Crawford	28 min
Aug 7, 11:24 AM CDT	Severe Thunderstorm Warning	ARX	La Crosse, Vernon	27 min
Aug 7, 11:26 AM CDT	Severe Thunderstorm Warning	ARX	Crawford, Richland, Vernon	21 min
Aug 7, 12:19 PM CDT	Special Weather Statement	ARX	Richland	26 min
Aug 7, 12:59 PM CDT	Areal Flood Advisory	ARX	Buffalo	2 hr
Aug 7, 1:17 PM CDT	Severe Thunderstorm Warning	ARX	Richland, Vernon	58 min
Aug 7, 1:48 PM CDT	Special Weather Statement	ARX	La Crosse	27 min
Aug 7, 2:14 PM CDT	Special Weather Statement	ARX	La Crosse	31 min
Aug 7, 2:23 PM CDT	Areal Flood Advisory	ARX	La Crosse, Trempealeau	112 min
Aug 7, 3:02 PM CDT	River Flood Warning	ARX	Monroe, Vernon	21 days
Aug 7, 3:02 PM CDT	River Flood Warning	ARX	Vernon	4 days
Aug 7, 3:02 PM CDT	River Flood Warning	ARX	Richland, Vernon	4 days
Aug 7, 3:02 PM CDT	River Flood Warning	ARX	Richland, Vernon	61 hr
Aug 7, 3:02 PM CDT	River Flood Warning	ARX	Buffalo, Trempealeau	19 hr
Aug 7, 3:07 PM CDT	Areal Flood Advisory	ARX	La Crosse	74 min
Aug 7, 3:23 PM CDT	Flash Flood Warning	ARX	La Crosse, Monroe	3 hr
Aug 7, 3:35 PM CDT	Severe Thunderstorm Warning	ARX	Vernon	55 min
Aug 7, 3:52 PM CDT	Severe Thunderstorm Warning	ARX	Crawford	38 min
Aug 7, 4:00 PM CDT	Tornado Warning	ARX	Crawford	30 min
Aug 7, 4:05 PM CDT	Severe Thunderstorm Warning	ARX	Richland	40 min
Aug 7, 4:19 PM CDT	Tornado Warning	ARX	Crawford, Grant	41 min
Aug 7, 4:27 PM CDT	Flash Flood Warning	ARX	Vernon	3 hr
Aug 7, 4:56 PM CDT	Tornado Warning Tornado observed	ARX	Grant	19 min
Aug 7, 5:53 PM CDT	Severe Thunderstorm Warning	ARX	Juneau, Monroe, Vernon	37 min
Aug 7, 6:18 PM CDT	Flash Flood Watch	ARX	Adams, Buffalo, Clark, Crawford, Jackson, Juneau and 5 more	35 hr
Aug 7, 7:21 AM CDT	Special Weather Statement	ARX	Winona	24 min
Aug 7, 10:29 AM CDT	Special Weather Statement	ARX	Olmsted	31 min
Aug 7, 10:33 AM CDT	Severe Thunderstorm Warning	ARX	Dodge, Olmsted, Wabasha	42 min
Aug 7, 11:14 AM CDT	Special Weather Statement	ARX	Wabasha	31 min
Aug 7, 12:12 PM CDT	Special Weather Statement	ARX	Wabasha	18 min
Aug 7, 12:23 PM CDT	Special Weather Statement	ARX	Olmsted	37 min

Nearby

Special Weather Statements in Wisconsin, 2021 Every special weather statement 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.