Alert archive / Wisconsin / Special Weather Statements in 2021

Special Weather Statement, NWS La Crosse, WI

July 29, 2021Grant County, Wisconsin

NWS La Crosse, WI issued this special weather statement at Jul 29, 2021, 1:39 AM CDT for Grant County, Wisconsin. It was in force for 66 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 29, 2021, 1:39 AM CDT (06:39 UTC)
Expired: Jul 29, 2021, 2:45 AM CDT
In force: 66 min
Issued by: NWS La Crosse, WI

County Grant County, WI

The radar

The La Crosse radar (KARX), 118 km from the middle of the area, began a volume at 06:39 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.

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 6.7 hours before the alert went out and 134 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: 4022 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 1022 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 52 m²/s²
0-3 km storm-relative helicity: 90 m²/s²
Significant tornado parameter: 1.0
Supercell composite: 6.8

Open this sounding in Storm Lab

The text

As transmitted.

803 
WWUS83 KARX 290639
SPSARX

Special Weather Statement
National Weather Service La Crosse WI
139 AM CDT Thu Jul 29 2021

IAZ030-WIZ061-290745-
Clayton-Grant-
139 AM CDT Thu Jul 29 2021

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT CENTRAL CLAYTON AND
GRANT COUNTIES...

At 139 AM CDT, radar indicated strong thunderstorms were located
along a line extending from near Monona to Bloomington to 8 miles
south of Muscoda. Movement was southeast at 40 mph.

Wind gusts of 50 to 55 mph and pea size hail are possible with these
storms.

Locations impacted include...
Platteville, Lancaster, Guttenberg, Fennimore, Cuba City, Monona,
Hazel Green, Dickeyville, Cassville, McGregor, Garnavillo,
Bloomington, Farmersburg, Potosi and Livingston.

Torrential rainfall is also occurring with these storms, and may
cause localized flooding. Do not drive your vehicle through flooded
roadways.

LAT...LON 4254 9064 4263 9070 4265 9076 4268 9090
      4265 9090 4264 9114 4308 9145 4308 9138
      4302 9117 4299 9116 4300 9110 4297 9099
      4310 9043 4251 9042 4251 9064
TIME...MOT...LOC 0639Z 329DEG 36KT 4302 9133 4291 9094 4306 9045 

$$

Rieck

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 28, 7:09 PM CDT	Special Weather Statement	ARX	Taylor	51 min
Jul 28, 8:19 PM CDT	Severe Thunderstorm Warning	ARX	Taylor	56 min
Jul 28, 9:32 PM CDT	Severe Thunderstorm Warning	ARX	Clark	43 min
Jul 28, 9:48 PM CDT	Severe Thunderstorm Warning	ARX	Clark, Jackson	57 min
Jul 28, 10:44 PM CDT	Severe Thunderstorm Warning	ARX	Buffalo, Trempealeau	46 min
Jul 28, 10:45 PM CDT	Special Weather Statement	ARX	Adams, Jackson, Juneau	60 min
Jul 28, 11:19 PM CDT	Severe Thunderstorm Warning	ARX	Jackson, Monroe, Trempealeau	26 min
Jul 28, 11:37 PM CDT	Special Weather Statement	ARX	La Crosse, Monroe	53 min
Jul 28, 11:54 PM CDT	Areal Flood Advisory	ARX	La Crosse	79 min
Jul 29, 12:26 AM CDT	Special Weather Statement	ARX	Crawford, Grant	94 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.