Alert archive / Wisconsin / Special Weather Statements in 2021

Special Weather Statement, NWS Milwaukee, WI

October 10, 2021Jefferson County, Wisconsin

NWS Milwaukee, WI issued this special weather statement at Oct 10, 2021, 8:01 AM CDT for Jefferson County, Wisconsin. It was in force for 29 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, 8:01 AM CDT (13:01 UTC)
Expired: Oct 10, 2021, 8:30 AM CDT
In force: 29 min
Issued by: NWS Milwaukee, WI
Hail: 0.00 in
Wind: 50

County Jefferson County, WI

The radar

The Milwaukee radar (KMKX), 27 km from the middle of the area, began a volume at 13:04 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

Green Bay/Straub, WI (KGRB), launched 12:00Z, 1.0 hours before the alert went out and 175 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: 559 J/kg
Mixed-layer CIN: -163 J/kg
Mixed-layer LCL: 987 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 130 m²/s²
0-3 km storm-relative helicity: 185 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

As transmitted.

455 
WWUS83 KMKX 101301
SPSMKX

Special Weather Statement
National Weather Service Milwaukee/Sullivan WI
801 AM CDT Sun Oct 10 2021
 
WIZ063>065-101330-
Waukesha WI-Jefferson WI-Dane WI-
801 AM CDT Sun Oct 10 2021

...A strong thunderstorm will impact portions of west central
Waukesha, southeastern Dane and Jefferson Counties through 830 AM
CDT...

At 800 AM CDT, Doppler radar was tracking a strong thunderstorm near
Fort Atkinson, moving northeast at 40 mph.

HAZARD...Wind gusts up to 50 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around 
         unsecured objects.

Locations impacted include...
Watertown, Fort Atkinson, Jefferson, Lake Mills, Johnson Creek,
Cambridge, Lake Ripley, Lake Koshkonong, Ixonia, Rome, Milford,
Sullivan, Rockdale, Busseyville, Pipersville, Helenville and Summit.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building. 

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 4299 8911 4320 8875 4320 8867 4302 8848
      4284 8896 4285 8904
TIME...MOT...LOC 1300Z 239DEG 36KT 4293 8891 

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...50 MPH

$$

KAVINSKY

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 10, 6:21 AM CDT	Special Weather Statement	MKX	Lafayette	39 min
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, 8:30 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.