Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 77, NWS Green Bay, WI

July 30, 2012Brown County, Wisconsin

NWS Green Bay, WI issued this severe thunderstorm warning at Jul 30, 2012, 5:50 PM CDT for Brown County, Wisconsin. It was in force for 40 min. 6 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 30, 2012, 5:50 PM CDT (22:50 UTC)
Expired: Jul 30, 2012, 6:30 PM CDT
In force: 40 min
Issued by: NWS Green Bay, WI
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Brown County, WI

The radar

The Green Bay radar (KGRB), 12 km from the middle of the area, began a volume at 22:53 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
Jul 30, 5:52 PM CDT	HAIL 1.5	Green Bay, WI
Jul 30, 5:54 PM CDT	HAIL 1	Howard, WI
Jul 30, 5:57 PM CDT	HAIL 1	1 S Suamico, WI
Jul 30, 5:57 PM CDT	HAIL 2.5	Howard, WI
Jul 30, 6:05 PM CDT	HAIL 0.5	3 Wsw Howard, WI
Jul 30, 6:25 PM CDT	HAIL 0.75	Bellevue, WI

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

Green Bay/Straub, WI (KGRB), launched 12:00Z, 10.8 hours before the alert went out and 12 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: 455 J/kg
Mixed-layer CIN: -119 J/kg
Mixed-layer LCL: 805 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 132 m²/s²
0-3 km storm-relative helicity: 114 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.0

Open this sounding in Storm Lab

The text

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

456 
WUUS53 KGRB 302250
SVRGRB
WIC009-302330-
/O.NEW.KGRB.SV.W.0077.120730T2250Z-120730T2330Z/

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

THE NATIONAL WEATHER SERVICE IN GREEN BAY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  BROWN COUNTY IN NORTHEAST WISCONSIN...

* UNTIL 630 PM CDT

* AT 543 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING LARGE HAIL AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED
  ALONG A LINE EXTENDING FROM 8 MILES NORTH OF GREEN BAY TO 6 MILES
  SOUTHWEST OF GREEN BAY...AND MOVING SOUTHEAST AT 35 MPH.

* LOCATIONS IMPACTED INCLUDE...
  GREEN BAY...DENMARK...ALLOUEZ...RED BANKS...UW GREEN BAY...
  LEDGEVIEW...BAY SETTLEMENT AND CHAMPION.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THESE ARE DANGEROUS STORMS. IF YOU ARE IN THEIR PATH...PREPARE
IMMEDIATELY FOR LARGE DESTRUCTIVE HAIL CAPABLE OF PRODUCING
SIGNIFICANT DAMAGE. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING AND AWAY FROM WINDOWS.

&&

LAT...LON 4440 8819 4444 8819 4468 8804 4467 8797
      4463 8800 4459 8796 4459 8799 4460 8801
      4456 8802 4454 8797 4455 8793 4458 8792
      4463 8787 4464 8782 4463 8776 4433 8777
      4433 8788 4428 8789
TIME...MOT...LOC 2248Z 299DEG 29KT 4460 8795 4445 8805
WIND...HAIL 60MPH <.75IN

$$

TH

4 follow-up statements

336 
WWUS53 KGRB 302257
SVSGRB

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

WIC009-302330-
/O.CON.KGRB.SV.W.0077.000000T0000Z-120730T2330Z/
BROWN WI-
557 PM CDT MON JUL 30 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR BROWN COUNTY
UNTIL 630 PM CDT...

AT 553 PM CDT...TRAINED WEATHER SPOTTERS REPORTED A LINE OF SEVERE
THUNDERSTORMS PRODUCING PING PONG BALL SIZE HAIL.  THESE STORMS WERE
LOCATED ALONG A LINE EXTENDING FROM 7 MILES NORTHEAST OF GREEN BAY TO
GREEN BAY...MOVING SOUTHEAST AT 35 MPH.

LOCATIONS IMPACTED INCLUDE...
  DENMARK...ALLOUEZ...LEDGEVIEW...CHAMPION...NEW FRANKEN...
  HUMBOLDT...BELLEVUE AND GLENMORE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR LARGE DESTRUCTIVE HAIL CAPABLE OF PRODUCING
SIGNIFICANT DAMAGE. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING AND AWAY FROM WINDOWS.

&&

LAT...LON 4440 8819 4444 8819 4468 8804 4467 8797
      4463 8800 4459 8796 4459 8799 4460 8801
      4456 8802 4454 8797 4455 8793 4458 8792
      4463 8787 4464 8782 4463 8776 4433 8777
      4433 8788 4428 8789
TIME...MOT...LOC 2257Z 299DEG 29KT 4456 8786 4446 8798
WIND...HAIL <50MPH 1.50IN

$$

TH

849 
WWUS53 KGRB 302309
SVSGRB

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

WIC009-302330-
/O.CON.KGRB.SV.W.0077.000000T0000Z-120730T2330Z/
BROWN WI-
609 PM CDT MON JUL 30 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR BROWN COUNTY
UNTIL 630 PM CDT...

AT 607 PM CDT...TRAINED WEATHER SPOTTERS REPORTED A LINE OF SEVERE 
THUNDERSTORMS PRODUCING UP TO PING PONG BALL SIZE HAIL.  THESE 
STORMS WERE LOCATED ALONG A LINE EXTENDING FROM 7 MILES NORTHEAST OF 
GREEN BAY TO GREEN BAY...MOVING EAST AT 15 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  GREEN BAY VICINITY TO AROUND 615 PM CDT.

OTHER LOCATIONS IMPACTED BY SEVERE THUNDERSTORMS INCLUDE DE PERE...
RED BANKS...UW GREEN BAY...BAY SETTLEMENT...ALLOUEZ...LEDGEVIEW...
CHAMPION...NEW FRANKEN...HUMBOLDT AND BELLEVUE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR LARGE DESTRUCTIVE HAIL CAPABLE OF PRODUCING
SIGNIFICANT DAMAGE. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING AND AWAY FROM WINDOWS.

&&

LAT...LON 4440 8819 4444 8819 4468 8804 4467 8797
      4463 8800 4459 8796 4459 8799 4460 8801
      4456 8802 4454 8797 4455 8793 4458 8792
      4463 8787 4464 8782 4463 8776 4433 8777
      4433 8788 4428 8789
TIME...MOT...LOC 2308Z 291DEG 12KT 4461 8794 4451 8805
WIND...HAIL <50MPH 1.50IN

$$

TH

392 
WWUS53 KGRB 302316
SVSGRB

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

WIC009-302330-
/O.CON.KGRB.SV.W.0077.000000T0000Z-120730T2330Z/
BROWN WI-
616 PM CDT MON JUL 30 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR BROWN COUNTY
UNTIL 630 PM CDT...

AT 611 PM CDT...DOPPLER RADAR INDICATE A LINE OF SEVERE 
THUNDERSTORMS PRODUCING QUARTER SIZE HAIL.  THESE STORMS WERE 
LOCATED ALONG A LINE EXTENDING FROM 8 MILES NORTHEAST OF GREEN BAY 
TO GREEN BAY...MOVING EAST AT 15 MPH.

SEVERE THUNDERSTORMS WILL AFFECT MAINLY RURAL AREAS OF BROWN
COUNTY...INCLUDING THE FOLLOWING LOCATIONS RED BANKS...UW GREEN
BAY...BAY SETTLEMENT...ALLOUEZ...LEDGEVIEW...CHAMPION...NEW
FRANKEN...HUMBOLDT AND BELLEVUE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR LARGE
HAIL. IF INDOORS...STAY AWAY FROM WINDOWS. PEOPLE OUTSIDE SHOULD MOVE
TO A SHELTER...PREFERABLY INSIDE A STRONG BUILDING.

&&

LAT...LON 4440 8812 4445 8812 4467 8798 4467 8797
      4463 8800 4459 8796 4459 8799 4460 8801
      4456 8802 4454 8797 4455 8793 4458 8792
      4460 8790 4462 8787 4464 8782 4463 8776
      4433 8777 4433 8788
TIME...MOT...LOC 2315Z 291DEG 12KT 4460 8791 4450 8802
WIND...HAIL <50MPH 1.00IN

$$

TH

191 
WWUS53 KGRB 302329
SVSGRB

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

WIC009-302337-
/O.EXP.KGRB.SV.W.0077.000000T0000Z-120730T2330Z/
BROWN WI-
629 PM CDT MON JUL 30 2012

...THE SEVERE THUNDERSTORM WARNING FOR BROWN COUNTY WILL EXPIRE AT
630 PM CDT...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAS WEAKENED BELOW 
SEVERE LIMITS.  HOWEVER UP TO PENNY SIZE HAIL IS STILL POSSIBLE WITH 
A LINE OF THUNDERSTORMS MOVING OVER BROWN COUNTY.

HOWEVER SEVERE THUNDERSTORMS MAY REDEVELOP WHICH WOULD PROMPT 
ANOTHER WARNING. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT 
UNTIL 800 PM CDT.

LAT...LON 4440 8812 4445 8812 4467 8798 4467 8797
      4463 8800 4459 8796 4459 8799 4460 8801
      4456 8802 4454 8797 4455 8793 4458 8792
      4460 8790 4462 8787 4464 8782 4463 8776
      4433 8777 4433 8788
TIME...MOT...LOC 2327Z 291DEG 12KT 4459 8786 4449 8797

$$

TH

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 30, 4:36 PM CDT	Severe Thunderstorm Warning	GRB	Marinette	24 min
Jul 30, 5:28 PM CDT	Severe Thunderstorm Warning	GRB	Brown, Oconto	47 min
Jul 30, 5:32 PM CDT	Special Marine Warning	GRB		51 min
Jul 30, 5:58 PM CDT	Severe Thunderstorm Warning	GRB	Brown, Door, Kewaunee	62 min
Jul 30, 6:04 PM CDT	Special Marine Warning	GRB		86 min
Jul 30, 6:06 PM CDT	Severe Thunderstorm Warning	GRB	Door	39 min
Jul 30, 6:36 PM CDT	Severe Thunderstorm Warning	GRB	Brown	39 min
Jul 30, 6:44 PM CDT	Severe Thunderstorm Warning	GRB	Door	61 min
Jul 30, 6:49 PM CDT	Special Marine Warning	GRB		116 min
Jul 30, 6:53 PM CDT	Severe Thunderstorm Warning	GRB	Kewaunee, Manitowoc	37 min

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.