Alert archive / Wisconsin / Special Weather Statements in 2018

Special Weather Statement, NWS Twin Cities, MN

August 7, 2018Dunn County, Wisconsin

NWS Twin Cities, MN issued this special weather statement at Aug 7, 2018, 4:41 PM CDT for Dunn County, Wisconsin. It was in force for 64 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, 4:41 PM CDT (21:41 UTC)
Expired
Aug 7, 2018, 5:45 PM CDT
In force
64 min
Issued by
NWS Twin Cities, MN

County Dunn County, WI

The radar

The Minneapolis radar (KMPX), 136 km from the middle of the area, began a volume at 21:40 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, 9.7 hours before the alert went out and 139 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.

092 
WWUS83 KMPX 072141
SPSMPX

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

WIZ025-072245-
Dunn-
441 PM CDT TUE AUG 7 2018

...A STRONG THUNDERSTORM WILL AFFECT NORTHERN DUNN COUNTY...

At 441 PM CDT, a strong thunderstorm was located over Connorsville,
or 16 miles northwest of Menomonie, moving east at 20 mph.

Pea size hail is possible with this storm.

Locations impacted include...
Menomonie, Colfax, Boyceville, Elk Mound, Wheeler, Ridgeland, Sand
Creek, Downing, Tainter Lake, Hoffman Hills Rec Area and
Connorsville.

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 4505 9214 4521 9214 4520 9167 4512 9167
      4512 9165 4486 9165
TIME...MOT...LOC 2141Z 288DEG 16KT 4512 9204 

$$

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, 3:25 PM CDTSpecial Weather StatementMPXEau Claire35 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.