Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 143, NWS Twin Cities, MN

August 31, 2018Polk County, Wisconsin

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 31, 2018, 6:49 AM CDT for Polk County, Wisconsin. It was in force for 20 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 31, 2018, 6:49 AM CDT (11:49 UTC)
Expired: Aug 31, 2018, 7:09 AM CDT
In force: 20 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 1.25 in
Wind: 50.0 mph

County Polk County, WI

The radar

The Minneapolis radar (KMPX), 132 km from the middle of the area, began a volume at 11:49 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, 11.8 hours before the alert went out and 134 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1307 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 120 m²/s²
0-3 km storm-relative helicity: 354 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted.

654 
WUUS53 KMPX 311149
SVRMPX
WIC095-311230-
/O.NEW.KMPX.SV.W.0143.180831T1149Z-180831T1230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Twin Cities/Chanhassen MN
649 AM CDT FRI AUG 31 2018

The National Weather Service in The Twin Cities has issued a

* Severe Thunderstorm Warning for...
  Northeastern Polk County in northwestern Wisconsin...

* Until 730 AM CDT.

* At 649 AM CDT, a severe thunderstorm was located over Luck, or 31
  miles southeast of Pine City, moving northeast at 25 mph.

  HAZARD...Half dollar size hail.

  SOURCE...Radar indicated.

  IMPACT...Damage to vehicles is expected.

* This severe thunderstorm will be near...
  Frederic around 700 AM CDT.

Other locations impacted by this severe thunderstorm include Clam
Falls, Mckinley and Straight Lake Wilderness State Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4571 9215 4554 9216 4547 9250 4559 9262
      4573 9236 4572 9216
TIME...MOT...LOC 1149Z 239DEG 21KT 4555 9247 

HAIL...1.25IN
WIND...<50MPH
 
$$

BORGHOFF

2 follow-up statements

525 
WWUS53 KMPX 311204
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
704 AM CDT FRI AUG 31 2018

WIC095-311230-
/O.CON.KMPX.SV.W.0143.000000T0000Z-180831T1230Z/
Polk WI-
704 AM CDT FRI AUG 31 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 AM CDT
FOR NORTHEASTERN POLK COUNTY...

At 704 AM CDT, a severe thunderstorm was located over Straight Lake
Wilderness State Park, or 27 miles southwest of Spooner, moving
northeast at 25 mph.

HAZARD...Quarter size hail.

SOURCE...Radar indicated.

IMPACT...Damage to vehicles is expected.

This severe thunderstorm will remain over mainly rural areas of
northeastern Polk County, including the following locations... Clam
Falls, Mckinley and Straight Lake Wilderness State Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4571 9215 4554 9216 4553 9239 4562 9247
      4573 9236 4572 9216
TIME...MOT...LOC 1204Z 239DEG 21KT 4560 9236 

HAIL...1.00IN
WIND...<50MPH
 
$$

BORGHOFF

462 
WWUS53 KMPX 311209
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
709 AM CDT FRI AUG 31 2018

WIC095-311219-
/O.CAN.KMPX.SV.W.0143.000000T0000Z-180831T1230Z/
Polk WI-
709 AM CDT FRI AUG 31 2018

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN POLK COUNTY IS
CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled.

LAT...LON 4571 9215 4554 9216 4553 9239 4562 9247
      4573 9236 4572 9216
TIME...MOT...LOC 1208Z 239DEG 21KT 4561 9233 

$$

BORGHOFF

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 31, 4:33 AM CDT	Special Weather Statement	MPX	Dunn	27 min
Aug 31, 6:31 AM CDT	Special Weather Statement	MPX	Polk	44 min
Aug 31, 11:32 AM CDT	Special Weather Statement	MPX	Pierce	28 min
Aug 31, 11:38 AM CDT	Severe Thunderstorm Warning	MPX	Pierce	37 min
Aug 31, 12:09 PM CDT	Special Weather Statement	MPX	Pierce	21 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 2018 Every severe thunderstorm warning 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.