Alert archive / Wisconsin / Special Weather Statements in 2018

Special Weather Statement, NWS Twin Cities, MN

August 4, 2018Polk County, Wisconsin

NWS Twin Cities, MN issued this special weather statement at Aug 4, 2018, 12:58 AM CDT for Polk County, Wisconsin. It was in force for 32 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 4, 2018, 12:58 AM CDT (05:58 UTC)
Expired
Aug 4, 2018, 1:30 AM CDT
In force
32 min
Issued by
NWS Twin Cities, MN

County Polk County, WI

The radar

The Minneapolis radar (KMPX), 116 km from the middle of the area, began a volume at 06:01 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 00:00Z, 6.0 hours before the alert went out and 118 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 00:00Z on 2018-08-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3195 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 00:00Z on 2018-08-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 164 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
3195 J/kg
Mixed-layer CIN
-10 J/kg
Mixed-layer LCL
1086 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
164 m²/s²
0-3 km storm-relative helicity
230 m²/s²
Significant tornado parameter
3.0
Supercell composite
17.5

Open this sounding in Storm Lab

The text

As transmitted.

674 
WWUS83 KMPX 040558
SPSMPX

Special Weather Statement
National Weather Service Twin Cities/Chanhassen MN
1258 AM CDT SAT AUG 4 2018

WIZ014-040630-
Polk-
1258 AM CDT SAT AUG 4 2018

...A STRONG THUNDERSTORM WILL AFFECT NORTHEASTERN POLK COUNTY...

At 1258 AM CDT, a strong thunderstorm was located over Balsam Lake,
or 34 miles west of Rice Lake, moving northeast at 30 mph.

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

Locations impacted include...
Amery, Frederic, Luck, Turtle Lake, Balsam Lake, Centuria, Milltown,
Clayton, Range, Joel, Wolf Creek and Cushing.

This includes U.S. Highway 61 near mile marker 165.
 
LAT...LON 4572 9235 4539 9215 4529 9216 4527 9248
      4538 9249 4557 9275
TIME...MOT...LOC 0558Z 243DEG 24KT 4544 9245 

$$

AMK

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 3, 7:02 PM CDTSevere Thunderstorm WarningMPXStearns, Wright43 min
Aug 3, 7:33 PM CDTSevere Thunderstorm WarningMPXBenton, Mille Lacs, Sherburne, Wright27 min
Aug 3, 7:41 PM CDTSpecial Weather StatementMPXRenville49 min
Aug 3, 10:19 PM CDTFlash Flood WarningMPXBenton, Sherburne, Stearns3 hr
Aug 4, 12:05 AM CDTSpecial Weather StatementMPXIsanti25 min
Aug 4, 12:17 AM CDTSevere Thunderstorm WarningMPXChisago, Washington28 min
Aug 4, 12:41 AM CDTSpecial Weather StatementMPXMille Lacs34 min
Aug 4, 12:43 AM CDTSpecial Weather StatementMPXIsanti32 min
Aug 4, 1:15 AM CDTSpecial Weather StatementMPXKanabec30 min
Aug 4, 1:49 AM CDTSpecial Weather StatementMPXBarron26 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.