Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 150, NWS Twin Cities, MN

July 12, 2017Pierce County, Polk County, Saint Croix County, Wisconsin; Dakota County, Ramsey County, Washington County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 12, 2017, 2:48 AM CDT for Pierce County, Polk County, Saint Croix County, Wisconsin; Dakota County, Ramsey County, Washington County, Minnesota. It was in force for 27 min. 8 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: Jul 12, 2017, 2:48 AM CDT (07:48 UTC)
Expired: Jul 12, 2017, 3:15 AM CDT
In force: 27 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Dakota County, MN, Ramsey County, MN, Washington County, MN, Pierce County, WI, Polk County, WI, Saint Croix County, WI

The radar

The Minneapolis radar (KMPX), 65 km from the middle of the area, began a volume at 07:49 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.

What was reported inside it

Time	Report	Where	Remark
Jul 12, 2:48 AM CDT	TSTM WND DMG	3 Ene Mahtomedi, MN	TREES DOWN.
Jul 12, 2:48 AM CDT	TSTM WND DMG	Somerset, WI	NUMEROUS TREES DOWN.
Jul 12, 2:48 AM CDT	TSTM WND DMG	St. Paul, MN	TREES AND POWER LINES DOWN. TIME ESTIMATED.
Jul 12, 2:50 AM CDT	TSTM WND DMG	Star Prairie, WI	TREES AND POWER LINES DOWN.
Jul 12, 2:50 AM CDT	TSTM WND DMG	Star Prairie, WI	TREES AND POWER LINES DOWN.
Jul 12, 2:57 AM CDT	TSTM WND DMG	Stillwater, MN	TREES DOWN.
Jul 12, 3:15 AM CDT	TSTM WND GST 53	2 N New Richmond, WI	AWOS STATION RNH, NEW RICHMOND AP CORRECTED TO TSTM WND GST.
Jul 12, 3:15 AM CDT	NON-TSTM WND GST 53	2 N New Richmond, WI	AWOS STATION RNH, NEW RICHMOND AP.

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
Jul 11, 10:00 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 7.8 hours before the alert went out and 68 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: 913 J/kg
Mixed-layer CIN: -179 J/kg
Mixed-layer LCL: 1279 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 86 m²/s²
0-3 km storm-relative helicity: 202 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 4.0

Open this sounding in Storm Lab

The text

As transmitted.

208 
WUUS53 KMPX 120748
SVRMPX
MNC037-123-163-WIC093-095-109-120815-
/O.NEW.KMPX.SV.W.0150.170712T0748Z-170712T0815Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Twin Cities/Chanhassen MN
248 AM CDT WED JUL 12 2017

The National Weather Service in The Twin Cities has issued a

* Severe Thunderstorm Warning for...
  Northeastern Dakota County in east central Minnesota...
  Washington County in east central Minnesota...
  Southern Ramsey County in east central Minnesota...
  Western Pierce County in west central Wisconsin...
  St. Croix County in west central Wisconsin...
  South central Polk County in northwestern Wisconsin...

* Until 315 AM CDT

* At 248 AM CDT, severe thunderstorms were located along a line
  extending from East Farmington to near Lake Elmo Airport to St.
  Paul, moving southeast at 70 mph.

  HAZARD...60 mph wind gusts. 

  SOURCE...Radar indicated. 

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

* Severe thunderstorms will be near,
  Hudson, New Richmond, Afton and Star Prairie around 255 AM CDT. 
  River Falls around 300 AM CDT. 
  Hastings and Prescott around 305 AM CDT. 
  Ellsworth, Baldwin and Hammond around 310 AM CDT. 
  Woodville around 315 AM CDT. 
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

Wind damage with these storms will occur before any rain or
lightning. Do not wait for the sound of thunder before taking cover.
SEEK SHELTER IMMEDIATELY inside a sturdy structure and stay away from
windows.

&&

LAT...LON 4505 9215 4469 9243 4462 9262 4464 9262
      4471 9273 4467 9273 4482 9308 4489 9318
      4496 9321 4502 9320 4508 9292 4533 9270
      4537 9269
TIME...MOT...LOC 0748Z 314DEG 60KT 4527 9268 4502 9285 4496 9308 

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

BORGHOFF

1 follow-up statement

373 
WWUS53 KMPX 120810
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
310 AM CDT WED JUL 12 2017

MNC037-123-163-WIC093-095-109-120819-
/O.EXP.KMPX.SV.W.0150.000000T0000Z-170712T0815Z/
Dakota MN-Washington MN-Ramsey MN-Pierce WI-St. Croix WI-Polk WI-
310 AM CDT WED JUL 12 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN DAKOTA...
WASHINGTON...SOUTHERN RAMSEY...WESTERN PIERCE...ST. CROIX AND SOUTH
CENTRAL POLK COUNTIES WILL EXPIRE AT 315 AM CDT...
    
The gust front which prompted the warning has weakened below severe 
limits. Therefore the warning will be allowed to expire.  However 
gusty winds are still possible for the next hour.

LAT...LON 4505 9215 4469 9243 4462 9262 4464 9262
      4471 9273 4467 9273 4482 9308 4489 9318
      4496 9321 4502 9320 4508 9292 4533 9270
      4537 9269
TIME...MOT...LOC 0809Z 314DEG 60KT 4503 9233 4478 9250 4472 9273 

$$

BORGHOFF

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 12, 3:17 AM CDT	Severe Thunderstorm Warning	MPX	Barron, Polk	43 min
Jul 12, 3:25 AM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Dunn, Eau Claire	35 min
Jul 12, 3:41 AM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Rusk	38 min
Jul 12, 3:51 AM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Eau Claire	24 min
Jul 12, 4:32 PM CDT	Special Weather Statement	MPX	Eau Claire	28 min
Jul 11, 11:02 PM CDT	Special Weather Statement	MPX	Swift	28 min
Jul 11, 11:14 PM CDT	Severe Thunderstorm Warning	MPX	Douglas	46 min
Jul 11, 11:27 PM CDT	Severe Thunderstorm Warning	MPX	Pope	33 min
Jul 11, 11:59 PM CDT	Severe Thunderstorm Warning	MPX	Douglas, Pope, Stearns, Todd	46 min
Jul 12, 12:10 AM CDT	Severe Thunderstorm Warning	MPX	Mille Lacs, Morrison	35 min
Jul 12, 12:45 AM CDT	Severe Thunderstorm Warning	MPX	Douglas, Pope, Stearns, Todd	21 min
Jul 12, 12:46 AM CDT	Severe Thunderstorm Warning	MPX	Kanabec, Mille Lacs	44 min
Jul 12, 1:44 AM CDT	Severe Thunderstorm Warning	MPX	Anoka, Benton, Isanti, Mille Lacs, Sherburne	46 min
Jul 12, 2:27 AM CDT	Special Weather Statement	MPX	Anoka, Ramsey, Washington	33 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 2017 Severe Thunderstorm Warnings in Minnesota, 2017 Every severe thunderstorm warning in 2017

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.