Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 129, NWS Twin Cities, MN

August 22, 2015Saint Croix County, Wisconsin

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 22, 2015, 7:22 PM CDT for Saint Croix County, Wisconsin. It was in force for 23 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 22, 2015, 7:22 PM CDT (00:22 UTC)
Expired: Aug 22, 2015, 7:45 PM CDT
In force: 23 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Saint Croix County, WI

The radar

The Minneapolis radar (KMPX), 102 km from the middle of the area, began a volume at 00:25 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 watch it was issued in

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

Issued	Product	Office	Lasted
Aug 22, 2:35 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 00:00Z, 0.4 hours before the alert went out and 342 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: 1692 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: 65 m²/s²
0-3 km storm-relative helicity: 57 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

820 
WUUS53 KMPX 230022
SVRMPX
WIC109-230045-
/O.NEW.KMPX.SV.W.0129.150823T0022Z-150823T0045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
722 PM CDT SAT AUG 22 2015

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN ST. CROIX COUNTY IN WEST CENTRAL WISCONSIN...

* UNTIL 745 PM CDT

* AT 722 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED OVER HOULTON...OR
  13 MILES NORTH OF RIVER FALLS...MOVING NORTHEAST AT 40 MPH.

  HAZARD...60 MPH WIND GUSTS AND QUARTER SIZE HAIL. 

  SOURCE...RADAR INDICATED. 

  IMPACT...HAIL DAMAGE TO VEHICLES IS EXPECTED. EXPECT WIND DAMAGE 
           TO ROOFS...SIDING AND TREES. 

* THIS SEVERE THUNDERSTORM WILL REMAIN OVER MAINLY RURAL AREAS OF
  NORTHEASTERN ST. CROIX COUNTY...INCLUDING THE FOLLOWING
  LOCATIONS...HOULTON...FOREST...CYLON AND DEER PARK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1100 PM CDT FOR NORTHWESTERN
WISCONSIN.

LAT...LON 4517 9217 4499 9250 4506 9258 4521 9240
      4520 9219
TIME...MOT...LOC 0022Z 229DEG 36KT 4505 9252 

HAIL...1.00IN
WIND...60MPH
 
$$

CLF

1 follow-up statement

295 
WWUS53 KMPX 230037
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
737 PM CDT SAT AUG 22 2015

WIC109-230047-
/O.EXP.KMPX.SV.W.0129.000000T0000Z-150823T0045Z/
ST. CROIX WI-
737 PM CDT SAT AUG 22 2015

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN ST. CROIX COUNTY
WILL EXPIRE AT 745 PM CDT...
                
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSE AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
THEREFORE THE WARNING WILL BE ALLOWED TO EXPIRE.

LAT...LON 4517 9217 4499 9250 4506 9258 4521 9240
      4520 9219
TIME...MOT...LOC 0035Z 229DEG 36KT 4505 9252 

$$

CLF

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 22, 7:18 PM CDT	Special Weather Statement	MPX	Saint Croix	27 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 2015 Every severe thunderstorm warning in 2015

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.