Alert archive / Wisconsin / Special Weather Statements in 2021

Special Weather Statement, NWS Twin Cities, MN

October 20, 2021Eau Claire County, Pepin County, Wisconsin

NWS Twin Cities, MN issued this special weather statement at Oct 20, 2021, 2:11 PM CDT for Eau Claire County, Pepin County, Wisconsin. It was in force for 49 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 20, 2021, 2:11 PM CDT (19:11 UTC)
Expired
Oct 20, 2021, 3:00 PM CDT
In force
49 min
Issued by
NWS Twin Cities, MN
Hail
0.50 in
Wind
30

Counties Eau Claire County, WI, Pepin County, WI

The radar

The La Crosse radar (KARX), 103 km from the middle of the area, began a volume at 19:10 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

Minneapolis, MN (KMPX), launched 12:00Z, 7.2 hours before the alert went out and 161 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, Minneapolis, MN at 12:00Z on 2021-10-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Minneapolis, MN at 12:00Z on 2021-10-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 62 square meters per square second.19395878Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1107 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
62 m²/s²
0-3 km storm-relative helicity
163 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

285 
WWUS83 KMPX 201911
SPSMPX

Special Weather Statement
National Weather Service Twin Cities/Chanhassen MN
211 PM CDT Wed Oct 20 2021
 
WIZ025>028-202000-
Chippewa WI-Dunn WI-Eau Claire WI-Pepin WI-
211 PM CDT Wed Oct 20 2021

...A strong thunderstorm will impact portions of northeastern Pepin,
southeastern Dunn, south central Chippewa and western Eau Claire
Counties through 300 PM CDT...

At 210 PM CDT, Doppler radar was tracking a strong thunderstorm near
Mondovi, moving northeast at 45 mph.

HAZARD...Half inch hail.

SOURCE...Radar indicated.

IMPACT...Minor damage to outdoor objects is possible.

Locations impacted include...
  Altoona, Lake Hallie, Eau Claire, Fall Creek and Lake Wissota.

This includes the following highways...
 Interstate 94 in Wisconsin between mile markers 58 and 77.
 U.S. Highway 53 between mile markers 86 and 101.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building. 

&&

LAT...LON 4459 9152 4460 9195 4461 9197 4502 9139
      4482 9109
TIME...MOT...LOC 1910Z 229DEG 38KT 4459 9177 

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...<30 MPH

$$

NDC

The office that day

Everything else NWS Twin Cities, MN issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Oct 20, 11:41 AM CDTSpecial Weather StatementMPXDakota34 min
Oct 20, 1:06 PM CDTSpecial Weather StatementMPXChisago24 min
Oct 20, 1:57 PM CDTSpecial Weather StatementMPXPolk33 min

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.