Alert archive / Wisconsin / Special Weather Statements in 2021

Special Weather Statement, NWS Milwaukee, WI

October 10, 2021Lafayette County, Wisconsin

NWS Milwaukee, WI issued this special weather statement at Oct 10, 2021, 6:21 AM CDT for Lafayette County, Wisconsin. It was in force for 39 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: Oct 10, 2021, 6:21 AM CDT (11:21 UTC)
Expired: Oct 10, 2021, 7:00 AM CDT
In force: 39 min
Issued by: NWS Milwaukee, WI
Hail: 0.25 in
Wind: 30

County Lafayette County, WI

The radar

The Quad Cities radar (KDVN), 121 km from the middle of the area, began a volume at 11:22 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, 11.4 hours before the alert went out and 118 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: 642 J/kg
Mixed-layer CIN: -225 J/kg
Mixed-layer LCL: 1320 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 165 m²/s²
0-3 km storm-relative helicity: 282 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted.

081 
WWUS83 KMKX 101121
SPSMKX

Special Weather Statement
National Weather Service Milwaukee/Sullivan WI
621 AM CDT Sun Oct 10 2021
 
WIZ062-067-068-101200-
Green WI-Lafayette WI-Iowa WI-
621 AM CDT Sun Oct 10 2021

...A strong thunderstorm will impact portions of Lafayette,
southwestern Green and south central Iowa Counties through 700 AM
CDT...

At 617 AM CDT, Doppler radar was tracking a cluster of strong 
thunderstorms, extending from the Galena area west to southwest 
of Dubuque, moving northeast at 45 mph.

HAZARD...Wind gusts of 30 to 35 mph and pea size hail are possible. 
         Frequent lightning with occasional cloud to ground strikes. 

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...
Monroe, Dodgeville, Mineral Point, Darlington, Shullsburg, Belmont,
Benton, Argyle, Apple River, Wiota, New Diggings, South Wayne,
Waldwick, Elk Grove, Fayette, Lamont, Browntown, Gratiot, Calamine
and Lead Mine.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building. 

&&

LAT...LON 4265 9043 4298 9019 4255 8943 4250 8963
      4251 9042
TIME...MOT...LOC 1117Z 226DEG 62KT 4244 9040 

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...30 MPH

$$

KAVINSKY

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 10, 7:07 AM CDT	Special Weather Statement	MKX	Green	23 min
Oct 10, 7:30 AM CDT	Special Weather Statement	MKX	Rock	30 min
Oct 10, 7:50 AM CDT	Special Weather Statement	MKX	Walworth	25 min
Oct 10, 8:01 AM CDT	Special Weather Statement	MKX	Jefferson	29 min
Oct 10, 8:30 AM CDT	Special Weather Statement	MKX	Waukesha	45 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.