Alert archive / Wisconsin / Special Weather Statements in 2018

Special Weather Statement, NWS Twin Cities, MN

August 7, 2018Eau Claire County, Wisconsin

NWS Twin Cities, MN issued this special weather statement at Aug 7, 2018, 3:25 PM CDT for Eau Claire County, Wisconsin. It was in force for 35 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 7, 2018, 3:25 PM CDT (20:25 UTC)
Expired
Aug 7, 2018, 4:00 PM CDT
In force
35 min
Issued by
NWS Twin Cities, MN

County Eau Claire County, WI

The radar

The La Crosse radar (KARX), 103 km from the middle of the area, began a volume at 20:29 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, 8.4 hours before the alert went out and 176 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 2018-08-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 138 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 2018-08-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 23 square meters per square second.1939587897Sfc1 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
138 J/kg
Mixed-layer CIN
-72 J/kg
Mixed-layer LCL
1084 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
23 m²/s²
0-3 km storm-relative helicity
4 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

471 
WWUS83 KMPX 072025
SPSMPX

Special Weather Statement
National Weather Service Twin Cities/Chanhassen MN
325 PM CDT TUE AUG 7 2018

WIZ028-072100-
Eau Claire-
325 PM CDT TUE AUG 7 2018

...A STRONG THUNDERSTORM WILL AFFECT WESTERN EAU CLAIRE COUNTY 
THROUGH 400 PM CDT...

At 325 PM CDT, a strong thunderstorm was located near Altoona, or 9
miles south of Eau Claire, moving east at 15 mph.

Dime size hail is possible with this storm.

Locations impacted include...
Eau Claire, Altoona, Lake Hallie, Fall Creek, Brackett, Allen and
Seymour.

This includes the following highways...
 Interstate 94 in Wisconsin between mile markers 64 and 80.
 U.S. Highway 53 between mile markers 86 and 92.

LAT...LON 4465 9117 4465 9156 4476 9160 4486 9143
      4486 9133
TIME...MOT...LOC 2025Z 257DEG 11KT 4472 9151 

$$

JPC

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 6, 7:19 PM CDTSpecial Weather StatementMPXSibley56 min
Aug 6, 7:53 PM CDTSpecial Weather StatementMPXNicollet, Sibley52 min
Aug 7, 2:46 PM CDTSpecial Weather StatementMPXPolk44 min
Aug 7, 4:41 PM CDTSpecial Weather StatementMPXDunn64 min
Aug 7, 5:11 PM CDTSpecial Weather StatementMPXDunn64 min
Aug 7, 6:08 PM CDTSpecial Weather StatementMPXPierce67 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.