Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 21, NWS Green Bay, WI

May 12, 2011Marathon County, Wisconsin

NWS Green Bay, WI issued this severe thunderstorm warning at May 12, 2011, 4:55 PM CDT for Marathon County, Wisconsin. It was in force for 50 min. 4 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: May 12, 2011, 4:55 PM CDT (21:55 UTC)
Expired: May 12, 2011, 5:45 PM CDT
In force: 50 min
Issued by: NWS Green Bay, WI
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

County Marathon County, WI

The radar

The Green Bay radar (KGRB), 119 km from the middle of the area, began a volume at 21:56 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
May 12, 4:58 PM CDT	HAIL 0.75	Weston, WI
May 12, 4:59 PM CDT	HAIL 1	Rothschild, WI	PENNY TO QUARTER SIZE HAIL.
May 12, 5:00 PM CDT	HAIL 1	Schofield, WI
May 12, 5:07 PM CDT	HAIL 1	Rothschild, 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
May 12, 1:41 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 9.9 hours before the alert went out and 121 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: 122 J/kg
Mixed-layer CIN: -257 J/kg
Mixed-layer LCL: 929 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 79 m²/s²
0-3 km storm-relative helicity: 130 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.

973 
WUUS53 KGRB 122155
SVRGRB
WIC073-122245-
/O.NEW.KGRB.SV.W.0021.110512T2155Z-110512T2245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GREEN BAY WI
455 PM CDT THU MAY 12 2011

THE NATIONAL WEATHER SERVICE IN GREEN BAY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN MARATHON COUNTY IN CENTRAL WISCONSIN...

* UNTIL 545 PM CDT

* AT 452 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS
  STORM WAS LOCATED 9 MILES NORTHEAST OF WAUSAU...AND MOVING NORTH AT
  15 MPH.

* THE SEVERE THUNDERSTORM WILL AFFECT MAINLY RURAL AREAS OF
  NORTHEASTERN MARATHON COUNTY.

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.

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
IN GREEN BAY.

&&

LAT...LON 4512 8965 4512 8927 4512 8926 4512 8922
      4484 8922 4484 8965
TIME...MOT...LOC 2155Z 177DEG 8KT 4503 8946
WIND...HAIL <50MPH 1.00IN

$$

KALLAS

3 follow-up statements

151 
WWUS53 KGRB 122201
SVSGRB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREEN BAY WI
501 PM CDT THU MAY 12 2011

WIC073-122245-
/O.CON.KGRB.SV.W.0021.000000T0000Z-110512T2245Z/
MARATHON WI-
501 PM CDT THU MAY 12 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHEASTERN
MARATHON COUNTY UNTIL 545 PM CDT...

AT 456 PM CDT...TRAINED WEATHER SPOTTERS REPORTED A SEVERE 
THUNDERSTORM PRODUCING QUARTER SIZE HAIL IN THE TOWN OF ROTHSCHILD.
THIS STORM WAS LOCATED 10 MILES NORTHEAST OF WAUSAU...MOVING NORTH 
AT 15 MPH.

THE SEVERE THUNDERSTORM WILL AFFECT THE TOWNS OF SCHOFIELD AND 
NUTTERVILLE.

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.

TO REPORT SEVERE WEATHER...CONTACT THE NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
IN GREEN BAY.

&&

LAT...LON 4512 8965 4512 8927 4512 8926 4512 8922
      4484 8922 4484 8965
TIME...MOT...LOC 2200Z 177DEG 8KT 4504 8946
WIND...HAIL <50MPH 1.00IN

$$

KALLAS

406 
WWUS53 KGRB 122217
SVSGRB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREEN BAY WI
517 PM CDT THU MAY 12 2011

WIC073-122245-
/O.CON.KGRB.SV.W.0021.000000T0000Z-110512T2245Z/
MARATHON WI-
517 PM CDT THU MAY 12 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHEASTERN
MARATHON COUNTY UNTIL 545 PM CDT...

AT 513 PM CDT...DOPPLER RADAR REPORTED A SEVERE THUNDERSTORM 
PRODUCING QUARTER SIZE HAIL. THIS STORM WAS LOCATED 13 MILES 
NORTHEAST OF WAUSAU...MOVING NORTH AT 15 MPH.

LOCATIONS IMPACTED INCLUDE...
  MAINLY RURAL AREAS OF EXTREME NORTHEASTERN MARATHON COUNTY.

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.

TO REPORT SEVERE WEATHER...CONTACT THE NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
IN GREEN BAY.

&&

LAT...LON 4512 8965 4512 8927 4512 8926 4512 8922
      4484 8922 4484 8965
TIME...MOT...LOC 2217Z 202DEG 11KT 4509 8942
WIND...HAIL <50MPH 1.00IN

$$

KALLAS

162 
WWUS53 KGRB 122241
SVSGRB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREEN BAY WI
541 PM CDT THU MAY 12 2011

WIC073-122250-
/O.EXP.KGRB.SV.W.0021.000000T0000Z-110512T2245Z/
MARATHON WI-
541 PM CDT THU MAY 12 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN MARATHON COUNTY
WILL EXPIRE AT 545 PM CDT...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A SEVERE 
THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 700 PM CDT!

LAT...LON 4512 8965 4512 8927 4512 8926 4512 8922
      4484 8922 4484 8965
TIME...MOT...LOC 2240Z 212DEG 19KT 4512 8946

$$

KALLAS

The office that day

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

Issued	Product	Office	Counties	Lasted
May 12, 3:48 AM CDT	Marine Dense Fog Advisory	GRB		27 hr
May 12, 3:32 PM CDT	Severe Thunderstorm Warning	GRB	Portage, Waupaca	43 min
May 12, 4:13 PM CDT	Severe Thunderstorm Warning	GRB	Outagamie, Shawano, Waupaca	62 min
May 12, 5:15 PM CDT	Severe Thunderstorm Warning	GRB	Langlade, Lincoln	45 min
May 12, 5:16 PM CDT	Severe Thunderstorm Warning	GRB	Outagamie	40 min
May 12, 5:49 PM CDT	Areal Flood Advisory	GRB	Marathon	3 hr
May 12, 6:11 PM CDT	Severe Thunderstorm Warning	GRB	Forest, Marinette	49 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 2011 Every severe thunderstorm warning in 2011

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.