Alert archive / Wisconsin / Special Weather Statements in 2021

Special Weather Statement, NWS Milwaukee, WI

August 3, 2021Waukesha County, Wisconsin

NWS Milwaukee, WI issued this special weather statement at Aug 3, 2021, 5:24 PM CDT for Waukesha County, Wisconsin. It was in force for 36 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
Aug 3, 2021, 5:24 PM CDT (22:24 UTC)
Expired
Aug 3, 2021, 6:00 PM CDT
In force
36 min
Issued by
NWS Milwaukee, WI
Hail
0.50 in
Wind
40

County Waukesha County, WI

The radar

The Milwaukee radar (KMKX), 41 km from the middle of the area, began a volume at 22:26 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, 10.4 hours before the alert went out and 144 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-pSkew-T log-p diagram, Green Bay/Straub, WI at 12:00Z on 2021-08-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 46 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Green Bay/Straub, WI at 12:00Z on 2021-08-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -7 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
46 J/kg
Mixed-layer CIN
-81 J/kg
Mixed-layer LCL
1357 m above ground
0-6 km bulk shear
13 kt
0-1 km storm-relative helicity
-7 m²/s²
0-3 km storm-relative helicity
12 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

489 
WWUS83 KMKX 032224
SPSMKX

Special Weather Statement
National Weather Service Milwaukee/Sullivan WI
524 PM CDT Tue Aug 3 2021
 
WIZ059-060-065-066-032300-
Waukesha WI-Milwaukee WI-Washington WI-Ozaukee WI-
524 PM CDT Tue Aug 3 2021

...A strong thunderstorm will impact portions of southwestern
Ozaukee, northwestern Milwaukee, northeastern Waukesha and
southeastern Washington Counties through 600 PM CDT...

At 523 PM CDT, Doppler radar was tracking a strong thunderstorm over
Germantown, moving southwest at 15 mph.

HAZARD...Winds in excess of 40 mph and half inch 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...
Northern Milwaukee, Wauwatosa, Brookfield, Menomonee Falls, Mequon,
Pewaukee, Sussex, Hartland, Delafield, Germantown, Lisbon, Merton,
Butler, Lannon and Colgate.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building. 

&&

LAT...LON 4328 8816 4325 8802 4306 8803 4306 8838
TIME...MOT...LOC 2223Z 022DEG 12KT 4321 8812 

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...40 MPH

$$

BOXELL

Nearby

Special Weather Statements in Wisconsin, 2021Every 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.