Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 87, NWS Green Bay, WI

July 30, 2012Manitowoc County, Wisconsin

NWS Green Bay, WI issued this severe thunderstorm warning at Jul 30, 2012, 8:14 PM CDT for Manitowoc County, Wisconsin. It was in force for 46 min. 1 report 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 30, 2012, 8:14 PM CDT (01:14 UTC)
Expired: Jul 30, 2012, 9:00 PM CDT
In force: 46 min
Issued by: NWS Green Bay, WI
Area: Storm-based polygon
Hail: 1.5 in
Wind: 50.0 mph

County Manitowoc County, WI

The radar

The Green Bay radar (KGRB), 51 km from the middle of the area, began a volume at 01:18 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 30, 8:22 PM CDT	HAIL 0.5	Mishicot, WI	AND 42 MPH WIND GUST

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 30, 1:28 PM CDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 1.2 hours before the alert went out and 375 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: 693 J/kg
Mixed-layer CIN: -115 J/kg
Mixed-layer LCL: 1937 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: -29 m²/s²
0-3 km storm-relative helicity: 40 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

The text

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

638 
WUUS53 KGRB 310114
SVRGRB
WIC071-310200-
/O.NEW.KGRB.SV.W.0087.120731T0114Z-120731T0200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GREEN BAY WI
814 PM CDT MON JUL 30 2012

THE NATIONAL WEATHER SERVICE IN GREEN BAY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN MANITOWOC COUNTY IN EAST CENTRAL WISCONSIN...

* UNTIL 900 PM CDT

* AT 808 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING PING PONG BALL SIZE HAIL. 
  THIS STORM WAS LOCATED NEAR TWO CREEKS...OR 12 MILES NORTH OF
  MANITOWOC...AND MOVING EAST AT 25 MPH.

* THE SEVERE THUNDERSTORM WILL AFFECT MAINLY RURAL AREAS OF
  NORTHEASTERN MANITOWOC COUNTY...INCLUDING THE FOLLOWING LOCATIONS
  POINT BEACH NUCLEAR PLANT AND POINT BEACH STATE FOREST.

THIS WARNING EXTENDS THE WARNING THAT WAS IN EFFECT FOR NORTHERN
MANITOWOC. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...LARGE HAIL...AND DEADLY
LIGHTNING. FOR YOUR PROTECTION...MOVE TO AN INTERIOR ROOM ON THE
LOWEST FLOOR OF YOUR HOME OR BUSINESS.

&&

LAT...LON 4416 8776 4433 8775 4433 8754 4432 8753
      4429 8753 4423 8750 4420 8750 4417 8752
      4416 8754
TIME...MOT...LOC 0113Z 271DEG 25KT 4426 8759
WIND...HAIL <50MPH 1.50IN

$$

ECKBERG

3 follow-up statements

912 
WWUS53 KGRB 310127
SVSGRB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREEN BAY WI
827 PM CDT MON JUL 30 2012

WIC071-310200-
/O.CON.KGRB.SV.W.0087.000000T0000Z-120731T0200Z/
MANITOWOC WI-
827 PM CDT MON JUL 30 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHEASTERN
MANITOWOC COUNTY UNTIL 900 PM CDT...

AT 826 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING PING PONG BALL SIZE HAIL. 
THIS STORM WAS LOCATED NEAR TWO CREEKS...OR 13 MILES NORTH OF
MANITOWOC...MOVING EAST AT 25 MPH.

THE SEVERE THUNDERSTORM WILL AFFECT MAINLY RURAL AREAS OF
NORTHEASTERN MANITOWOC COUNTY...INCLUDING THE FOLLOWING LOCATIONS 
POINT BEACH STATE FOREST AND TWO CREEKS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...LARGE HAIL...AND DEADLY
LIGHTNING. FOR YOUR PROTECTION...MOVE TO AN INTERIOR ROOM ON THE
LOWEST FLOOR OF YOUR HOME OR BUSINESS.

&&

LAT...LON 4416 8776 4433 8775 4433 8754 4432 8753
      4429 8753 4423 8750 4420 8750 4417 8752
      4416 8754
TIME...MOT...LOC 0126Z 269DEG 20KT 4426 8757
WIND...HAIL <50MPH 1.50IN

$$

ECKBERG

075 
WWUS53 KGRB 310134
SVSGRB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREEN BAY WI
834 PM CDT MON JUL 30 2012

WIC071-310200-
/O.CON.KGRB.SV.W.0087.000000T0000Z-120731T0200Z/
MANITOWOC WI-
834 PM CDT MON JUL 30 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHEASTERN
MANITOWOC COUNTY UNTIL 900 PM CDT...

AT 832 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR TWO
CREEKS...OR 13 MILES NORTH OF MANITOWOC...MOVING SOUTHEAST AT 20 MPH.

THE SEVERE THUNDERSTORM WILL AFFECT MAINLY RURAL AREAS OF
NORTHEASTERN MANITOWOC COUNTY...INCLUDING THE FOLLOWING LOCATIONS
POINT BEACH STATE FOREST.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM HAS EXHIBITED SOME WEAK ROTATION. TORNADOES CAN DEVELOP
QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH ONE IS NOT IMMEDIATELY
LIKELY...IF A TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF
SAFETY INSIDE A STURDY STRUCTURE... SUCH AS A BASEMENT OR SMALL
INTERIOR ROOM.

&&

LAT...LON 4416 8776 4433 8775 4433 8754 4432 8753
      4429 8753 4423 8750 4420 8750 4417 8752
      4416 8754
TIME...MOT...LOC 0134Z 288DEG 13KT 4425 8756
WIND...HAIL 60MPH 1.75IN

$$

ECKBERG

361 
WWUS53 KGRB 310153
SVSGRB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREEN BAY WI
853 PM CDT MON JUL 30 2012

WIC071-310201-
/O.EXP.KGRB.SV.W.0087.000000T0000Z-120731T0200Z/
MANITOWOC WI-
853 PM CDT MON JUL 30 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN MANITOWOC COUNTY
WILL EXPIRE AT 900 PM CDT...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
HOWEVER SMALL HAIL...GUSTY WINDS AND HEAVY RAIN ARE STILL POSSIBLE 
WITH THIS THUNDERSTORM.

MORE STORMS ARE DEVELOPING WEST OF MANITOWOC COUNTY THIS EVENING. 
SOME OF THE STORMS MAY BE STRONG WITH GUSTY WINDS...HEAVY RAIN
AND FREQUENT CLOUD TO GROUND LIGHTNING STRIKES. STAY TUNED FOR 
POSSIBLE WARNINGS THROUGHOUT THE EVENING. 

LAT...LON 4416 8776 4433 8775 4433 8754 4432 8753
      4429 8753 4423 8750 4420 8750 4417 8752
      4416 8754
TIME...MOT...LOC 0151Z 288DEG 13KT 4423 8748

$$

ECKBERG

The office that day

Everything else NWS Green Bay, WI issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 30, 7:11 PM CDT	Severe Thunderstorm Warning	GRB	Brown	49 min
Jul 30, 7:21 PM CDT	Severe Thunderstorm Warning	GRB	Manitowoc	54 min
Jul 30, 7:30 PM CDT	Severe Thunderstorm Warning	GRB	Kewaunee	30 min
Jul 30, 7:44 PM CDT	Severe Thunderstorm Warning	GRB	Door	61 min
Jul 30, 8:38 PM CDT	Special Marine Warning	GRB		2 hr

Nearby

Severe Thunderstorm Warnings in Wisconsin, 2012 Every severe thunderstorm warning in 2012

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.