Alert archive / Wisconsin / Special Weather Statements in 2018

Special Weather Statement, NWS Twin Cities, MN

August 1, 2018Pepin County, Wisconsin

NWS Twin Cities, MN issued this special weather statement at Aug 1, 2018, 3:12 PM CDT for Pepin County, Wisconsin. It was in force for 63 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 1, 2018, 3:12 PM CDT (20:12 UTC)
Expired
Aug 1, 2018, 4:15 PM CDT
In force
63 min
Issued by
NWS Twin Cities, MN

County Pepin County, WI

The radar

The La Crosse radar (KARX), 106 km from the middle of the area, began a volume at 20:16 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, 8.2 hours before the alert went out and 140 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 2018-08-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 69 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, Minneapolis, MN at 12:00Z on 2018-08-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 77 square meters per square second.193958Sfc1 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
69 J/kg
Mixed-layer CIN
-143 J/kg
Mixed-layer LCL
1302 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
77 m²/s²
0-3 km storm-relative helicity
147 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

As transmitted.

953 
WWUS83 KMPX 012012
SPSMPX

Special Weather Statement
National Weather Service Twin Cities/Chanhassen MN
312 PM CDT WED AUG 1 2018

WIZ025-026-012115-
Dunn-Pepin-
312 PM CDT WED AUG 1 2018

...A STRONG THUNDERSTORM WILL AFFECT NORTHEASTERN PEPIN AND
SOUTHEASTERN DUNN COUNTIES...

At 312 PM CDT, a strong thunderstorm was located over Eau Galle, or
14 miles south of Menomonie, moving east at 15 mph.

Winds in excess of 30 mph and dime size hail are possible with this
storm.

Locations impacted include...
Durand, Eau Galle, Rock Falls and Arkansaw. 

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 4459 9170 4460 9193 4464 9207 4475 9204
      4475 9165
TIME...MOT...LOC 2012Z 279DEG 14KT 4469 9196 

$$

SPD

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 1, 4:02 PM CDTSpecial Weather StatementMPXChippewa43 min

Nearby

Special Weather Statements in Wisconsin, 2018Every special weather statement in 2018

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.