Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 140, NWS Twin Cities, MN

August 27, 20184 counties in Wisconsin

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 27, 2018, 6:20 PM CDT for 4 counties in Wisconsin. It was in force for 55 min. 7 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Aug 27, 2018, 6:20 PM CDT (23:20 UTC)
Expired: Aug 27, 2018, 7:15 PM CDT
In force: 55 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 0.75 in
Wind: 80.0 mph

Counties Chippewa County, WI, Dunn County, WI, Eau Claire County, WI, Pepin County, WI

The radar

The La Crosse radar (KARX), 136 km from the middle of the area, began a volume at 23:20 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.

What was reported inside it

Time	Report	Where	Remark
Aug 27, 6:26 PM CDT	TSTM WND DMG	Boyceville, WI	MULTIPLE TREES AND POWER LINES DOWN. REPORT RELAYED VIA DISPATCH. TIME ESTIMATED FROM RADAR.
Aug 27, 6:33 PM CDT	TSTM WND DMG	5 Ene Wheeler, WI	5 LARGE OAK TREES UPROOTED AND BLOCKING 690TH ST. NEAR 1070TH AVE.
Aug 27, 6:41 PM CDT	TSTM WND DMG	Elk Mound, WI	TREE DOWN BLOCKING ROAD. REPORT RELAYED VIA DISPATCH. TIME ESTIMATED FROM RADAR.
Aug 27, 6:44 PM CDT	TSTM WND DMG	Colfax, WI	TREE DOWN BLOCKING ROAD. REPORT RELAYED VIA DISPATCH. TIME ESTIMATED FROM RADAR.
Aug 27, 6:49 PM CDT	TSTM WND DMG	New Auburn, WI	TREE DOWN BLOCKING ROAD. REPORT RELAYED VIA DISPATCH. TIME ESTIMATED FROM RADAR.
Aug 27, 6:49 PM CDT	TSTM WND DMG	Ridgeland, WI	TREES DOWN. REPORT RELAYED VIA DISPATCH. TIME ESTIMATED FROM RADAR.
Aug 27, 6:50 PM CDT	TSTM WND DMG	2 S Eau Claire, WI	REPORTS VIA TWITTER OF TREE BRANCHES DOWN ACROSS SOUTH SIDE OF EAU CLAIRE. TIME ESTIMATED FROM RADAR.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Aug 27, 2:57 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 11.3 hours before the alert went out and 152 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: 1465 J/kg
Mixed-layer CIN: -96 J/kg
Mixed-layer LCL: 698 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 232 m²/s²
0-3 km storm-relative helicity: 249 m²/s²
Significant tornado parameter: 0.8
Supercell composite: 4.7

Open this sounding in Storm Lab

The text

As transmitted.

946 
WUUS53 KMPX 272320
SVRMPX
WIC017-033-035-091-280015-
/O.NEW.KMPX.SV.W.0140.180827T2320Z-180828T0015Z/

BULLETIN - EAS ACTIVATION REQUESTED
Severe Thunderstorm Warning
National Weather Service Twin Cities/Chanhassen MN
620 PM CDT MON AUG 27 2018

The National Weather Service in The Twin Cities has issued a

* Severe Thunderstorm Warning for...
  Northeastern Pepin County in west central Wisconsin...
  Dunn County in west central Wisconsin...
  Chippewa County in west central Wisconsin...
  Eau Claire County in west central Wisconsin...

* Until 715 PM CDT.

* At 619 PM CDT, severe thunderstorms were located along a line
  extending from Glenwood City to near Menomonie to Rattlesnake
  Ridge, moving northeast at 80 mph.

  These are very dangerous storms.

  HAZARD...80 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be heavily damaged. Expect 
           considerable damage to roofs, windows, and vehicles. 
           Extensive tree damage and power outages are likely.

* Severe thunderstorms will be near...
  Menomonie, Boyceville and Wheeler around 625 PM CDT.
  Colfax around 630 PM CDT.
  Ridgeland around 635 PM CDT.
  Bloomer and New Auburn around 640 PM CDT.
  Cornell around 655 PM CDT.
  Augusta around 700 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This is an EXTREMELY DANGEROUS SITUATION. These storms are producing 
widespread wind damage. SEEK SHELTER NOW inside a sturdy structure 
and stay away from windows!

&&

LAT...LON 4460 9185 4485 9183 4513 9216 4517 9216
      4521 9208 4521 9155 4529 9153 4529 9093
      4460 9092
TIME...MOT...LOC 2319Z 235DEG 68KT 4506 9218 4489 9198 4425 9197 

HAIL...<.75IN
WIND...80MPH
 
$$

BORGHOFF

4 follow-up statements

515 
WWUS53 KMPX 272339
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
639 PM CDT MON AUG 27 2018

WIC017-033-035-091-280015-
/O.CON.KMPX.SV.W.0140.000000T0000Z-180828T0015Z/
Pepin WI-Dunn WI-Chippewa WI-Eau Claire WI-
639 PM CDT MON AUG 27 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM CDT
FOR NORTHEASTERN PEPIN...DUNN...CHIPPEWA AND EAU CLAIRE COUNTIES...

At 638 PM CDT, severe thunderstorms were located along a line
extending from Dallas to 6 miles northeast of Colfax to Lookout,
moving northeast at 70 mph.

HAZARD...70 mph wind gusts.

SOURCE...Law enforcement relayed multiple reports of wind damage 
         across Pierce and St Croix counties.

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings.

These severe storms will be near...
  Bloomer and New Auburn around 645 PM CDT.
  Augusta around 700 PM CDT.

Other locations impacted by these severe thunderstorms include Cedar
Falls, Caryville, Holcombe, Tainter Lake, Tilden, Otter Lake, Jim
Falls, Allen, Sand Creek and Chippewa Moraine State Rec Area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

These storms are producing widespread wind damage across Pierce and 
St Croix counties. SEEK SHELTER NOW inside a sturdy structure and 
stay away from windows.

&&

LAT...LON 4460 9185 4485 9183 4513 9216 4517 9216
      4521 9208 4521 9155 4529 9153 4529 9093
      4460 9092
TIME...MOT...LOC 2338Z 233DEG 62KT 4525 9180 4506 9162 4444 9160 

HAIL...<.75IN
WIND...70MPH
 
$$

JRB

225 
WWUS53 KMPX 272350
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
650 PM CDT MON AUG 27 2018

WIC017-033-035-091-280015-
/O.CON.KMPX.SV.W.0140.000000T0000Z-180828T0015Z/
Pepin WI-Dunn WI-Chippewa WI-Eau Claire WI-
650 PM CDT MON AUG 27 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM CDT
FOR NORTHEASTERN PEPIN...EASTERN DUNN...CHIPPEWA AND EAU CLAIRE
COUNTIES...

At 649 PM CDT, severe thunderstorms were located along a line
extending from Canton to near New Auburn to near Eleva, moving
northeast at 65 mph.

HAZARD...70 mph wind gusts.

SOURCE...Law enforcement reported widespread damage in Pierce and 
         St Croix counties.

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings.

These severe storms will be near...
  Stanley and Boyd around 715 PM CDT.

Other locations impacted by these severe thunderstorms include
Caryville, Holcombe, Tilden, Otter Lake, Jim Falls, Allen, Sand
Creek, Chippewa Moraine State Rec Area, Foster and Brackett.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This is a DANGEROUS SITUATION. These storms are producing widespread 
wind damage across counties in western Wisconsin. SEEK SHELTER NOW 
inside a sturdy structure and stay away from windows.
 
&&

LAT...LON 4460 9179 4507 9180 4521 9208 4521 9155
      4529 9153 4529 9093 4460 9092
TIME...MOT...LOC 2349Z 231DEG 57KT 4543 9166 4524 9148 4462 9147 

HAIL...<.75IN
WIND...70MPH
 
$$

JRB

655 
WWUS53 KMPX 280000
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
700 PM CDT MON AUG 27 2018

WIC033-091-280009-
/O.CAN.KMPX.SV.W.0140.000000T0000Z-180828T0015Z/
Pepin WI-Dunn WI-
700 PM CDT MON AUG 27 2018

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN PEPIN AND EASTERN
DUNN COUNTIES IS CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 1000 PM CDT for
west central Wisconsin.

LAT...LON 4460 9157 4529 9153 4529 9093 4460 9092
TIME...MOT...LOC 2359Z 263DEG 47KT 4525 9129 4463 9128 

$$

WIC017-035-280015-
/O.CON.KMPX.SV.W.0140.000000T0000Z-180828T0015Z/
Chippewa WI-Eau Claire WI-
700 PM CDT MON AUG 27 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM CDT
FOR CHIPPEWA AND EAU CLAIRE COUNTIES...

At 659 PM CDT, severe thunderstorms were located along a line
extending from near Chippewa Moraine State Rec Area to Foster, moving
east at 55 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

These severe storms will be near...
  Augusta and Cornell around 710 PM CDT.
  Fairchild around 715 PM CDT.

Other locations impacted by these severe thunderstorms include
Holcombe, Tilden, Otter Lake, Jim Falls, Allen, Chippewa Moraine
State Rec Area, Foster, Brackett, Lake Eau Claire County Park and
Bateman.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4460 9157 4529 9153 4529 9093 4460 9092
TIME...MOT...LOC 2359Z 263DEG 47KT 4525 9129 4463 9128 

HAIL...<.75IN
WIND...60MPH
 
$$

BORGHOFF

275 
WWUS53 KMPX 280013
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
713 PM CDT MON AUG 27 2018

WIC017-035-280022-
/O.EXP.KMPX.SV.W.0140.000000T0000Z-180828T0015Z/
Chippewa WI-Eau Claire WI-
713 PM CDT MON AUG 27 2018

...THE SEVERE THUNDERSTORM WARNING FOR CHIPPEWA AND EAU CLAIRE
COUNTIES WILL EXPIRE AT 715 PM CDT...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However heavy rain
is still possible with these thunderstorms.

A Severe Thunderstorm Watch remains in effect until 1000 PM CDT for
west central Wisconsin.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
The Twin Cities.

LAT...LON 4460 9157 4529 9153 4529 9093 4460 9092
TIME...MOT...LOC 0012Z 235DEG 68KT 4539 9100 4477 9099 

$$

BORGHOFF

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 27, 1:53 AM CDT	Special Weather Statement	MPX	Dunn, Pepin, Pierce, Saint Croix	67 min
Aug 27, 3:09 AM CDT	Special Weather Statement	MPX	Barron, Chippewa, Dunn, Eau Claire, Pepin, Rusk	36 min
Aug 27, 5:47 PM CDT	Severe Thunderstorm Warning	MPX	Dunn, Pepin, Pierce, Saint Croix	58 min
Aug 27, 6:03 PM CDT	Severe Thunderstorm Warning	MPX	Barron, Polk, Saint Croix	57 min
Aug 27, 6:41 PM CDT	Severe Thunderstorm Warning	MPX	Barron, Rusk	36 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.