Alert archive / Wisconsin / Special Weather Statements in 2021

Special Weather Statement, NWS Twin Cities, MN

October 20, 2021Polk County, Wisconsin

NWS Twin Cities, MN issued this special weather statement at Oct 20, 2021, 1:57 PM CDT for Polk County, Wisconsin. It was in force for 33 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, 1:57 PM CDT (18:57 UTC)
Expired
Oct 20, 2021, 2:30 PM CDT
In force
33 min
Issued by
NWS Twin Cities, MN
Hail
0.50 in
Wind
30

County Polk County, WI

The radar

The Minneapolis radar (KMPX), 107 km from the middle of the area, began a volume at 19:02 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, 7.0 hours before the alert went out and 109 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.

208 
WWUS83 KMPX 201857
SPSMPX

Special Weather Statement
National Weather Service Twin Cities/Chanhassen MN
157 PM CDT Wed Oct 20 2021
 
MNZ053-WIZ014-201930-
Chisago MN-Polk WI-
157 PM CDT Wed Oct 20 2021

...A strong thunderstorm will impact portions of east central Chisago
and northwestern Polk Counties through 230 PM CDT...

At 157 PM CDT, Doppler radar was tracking a strong thunderstorm near
Taylors Falls, or 26 miles east of Cambridge, moving north at 25 mph.

HAZARD...Half inch hail.

SOURCE...Radar indicated.

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

This strong thunderstorm will be near...
  Centuria around 200 PM CDT.

This includes U.S. Highway 8 in Minnesota between mile markers 21 and
22.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building. 

&&

LAT...LON 4562 9248 4538 9259 4541 9280 4564 9276
      4564 9264
TIME...MOT...LOC 1857Z 196DEG 22KT 4546 9271 

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, 2:11 PM CDTSpecial Weather StatementMPXEau Claire, Pepin49 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.