Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 38, NWS Green Bay, WI

May 22, 2011Portage County, Shawano County, Waupaca County, Wisconsin

NWS Green Bay, WI issued this severe thunderstorm warning at May 22, 2011, 6:56 PM CDT for Portage County, Shawano County, Waupaca County, Wisconsin. It was in force for 34 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: May 22, 2011, 6:56 PM CDT (23:56 UTC)
Expired: May 22, 2011, 7:30 PM CDT
In force: 34 min
Issued by: NWS Green Bay, WI
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Portage County, WI, Shawano County, WI, Waupaca County, WI

The radar

The Green Bay radar (KGRB), 76 km from the middle of the area, began a volume at 23:58 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

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 22, 2:04 PM CDT	Tornado Watch	SPC	9 hr

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 11.9 hours before the alert went out and 77 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: 351 J/kg
Mixed-layer CIN: -121 J/kg
Mixed-layer LCL: 1006 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: -1 m²/s²
0-3 km storm-relative helicity: -1 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.4

Open this sounding in Storm Lab

The text

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

802 
WUUS53 KGRB 222356
SVRGRB
WIC097-115-135-230030-
/O.NEW.KGRB.SV.W.0038.110522T2356Z-110523T0030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GREEN BAY WI
656 PM CDT SUN MAY 22 2011

THE NATIONAL WEATHER SERVICE IN GREEN BAY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EAST CENTRAL PORTAGE COUNTY IN CENTRAL WISCONSIN...
  SHAWANO COUNTY IN NORTHEAST WISCONSIN...
  NORTHERN WAUPACA COUNTY IN NORTHEAST WISCONSIN...

* UNTIL 730 PM CDT

* AT 654 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 6 MILES
  NORTHEAST OF AMHERST...OR 14 MILES NORTHWEST OF WAUPACA...AND
  MOVING NORTHEAST AT 50 MPH.

* LOCATIONS IMPACTED INCLUDE...
  CLINTONVILLE...NORTHLAND...IOLA...BIG FALLS...TIGERTON...SYMCO...
  SPLIT ROCK AND MARION.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORNADOES CAN DEVELOP QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH 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.

THIS IS A DANGEROUS THUNDERSTORM. DUE TO THE NATURE OF THESE
STORMS...THEY ARE CAPABLE OF PRODUCING ALL TYPES OF SEVERE WEATHER...
INCLUDING EXTREMELY LARGE HAIL...DESTRUCTIVE STRAIGHT LINE WINDS AND
POSSIBLY TORNADOES. MOVE QUICKLY TO A SAFE SHELTER...PREFERABLY INTO
AN INTERIOR ROOM...SUCH AS A BATHROOM OR A CLOSET...OR INTO A
BASEMENT.

&&

LAT...LON 4461 8938 4480 8886 4459 8873 4455 8874
      4441 8926
TIME...MOT...LOC 2355Z 246DEG 41KT 4452 8918
WIND...HAIL 60MPH 1.00IN

$$

MPC

2 follow-up statements

045 
WWUS53 KGRB 230006
SVSGRB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREEN BAY WI
706 PM CDT SUN MAY 22 2011

WIC097-230016-
/O.CAN.KGRB.SV.W.0038.000000T0000Z-110523T0030Z/
PORTAGE WI-
706 PM CDT SUN MAY 22 2011

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL PORTAGE COUNTY IS
CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED 
AREA.

LAT...LON 4446 8915 4466 8918 4480 8886 4459 8873
      4455 8874
TIME...MOT...LOC 0006Z 241DEG 44KT 4460 8901

$$

WIC115-135-230030-
/O.CON.KGRB.SV.W.0038.000000T0000Z-110523T0030Z/
WAUPACA WI-SHAWANO WI-
706 PM CDT SUN MAY 22 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SHAWANO AND
NORTHERN WAUPACA COUNTIES UNTIL 730 PM CDT...

AT 703 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 15 MILES
NORTHEAST OF AMHERST...OR 17 MILES NORTH OF WAUPACA...MOVING
NORTHEAST AT 50 MPH.

LOCATIONS IMPACTED INCLUDE...
  CLINTONVILLE...SPLIT ROCK...MARION AND CAROLINE.

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 4446 8915 4466 8918 4480 8886 4459 8873
      4455 8874
TIME...MOT...LOC 0006Z 241DEG 44KT 4460 8901
WIND...HAIL 60MPH 1.00IN

$$

MPC

135 
WWUS53 KGRB 230015
SVSGRB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREEN BAY WI
715 PM CDT SUN MAY 22 2011

WIC115-135-230030-
/O.CON.KGRB.SV.W.0038.000000T0000Z-110523T0030Z/
WAUPACA WI-SHAWANO WI-
715 PM CDT SUN MAY 22 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SHAWANO AND
NORTHEASTERN WAUPACA COUNTIES UNTIL 730 PM CDT...

AT 712 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF
60 MPH.  THIS STORM WAS LOCATED 8 MILES WEST OF CLINTONVILLE...OR 19
MILES SOUTHWEST OF SHAWANO...MOVING NORTHEAST AT 50 MPH. PENNY SIZE
HAIL MAY ALSO ACCOMPANY THESE DAMAGING WINDS.

LOCATIONS IMPACTED INCLUDE...
  CLINTONVILLE AND CAROLINE.

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 4472 8905 4480 8886 4459 8873 4455 8874
      4449 8903
TIME...MOT...LOC 0015Z 241DEG 44KT 4465 8887
WIND...HAIL 60MPH 0.75IN

$$

MPC

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Green Bay, WI wrote its last area forecast discussion before this severe thunderstorm warning went out at May 22, 5:57 PM CDT, 59 minutes earlier.

Area forecast discussion, May 22, 5:57 PM CDT, 59 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GREEN BAY WI
557 PM CDT SUN MAY 22 2011

.UPDATE...

SEVERE WEATHER AND TORNADO THREAT CONTINUES THIS EVENING.

STORMS OVER FOX VALLEY AND FAR NORTHEAST WISCONSIN STILL PRODUCING
HAIL UP TO PING BALL SIZE. THESE STORMS SHOULD MOVE OFF SHORE BY
630 PM CDT.

REFOCUSING ATTENTION ON WESTERN HALF OF THE FORECAST AREA WHERE
STRONG UPPER DYNAMICS...ASSOCIATED WITH STRONG DEEP LAYER IN
EXCESS OF 50 KNOTS...AND STRENGTHENING LOW-LEVEL SHEAR WHERE
BOUNDARY FLOW HAS BACKED SUBSTANTIALLY.

STILL MAILY DISCRETE STORMS AT THIS TIME THUS TORNADO THREAT
CONTINUES OVER THE SOUTHWEST...CENTRAL AND NORTHWEST PORTION OF
THE FORECAST AREA. STORMS WILL SPREAD BACK INTO THE FOX VALLEY
BEWTEEN ABOUT 7 AND 730 PM CDT.

ESB
&&

.GRB WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

Hazardous weather outlook, May 22, 12:03 PM CDT, 6 hours 53 minutes before

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE GREEN BAY WI
1203 PM CDT SUN MAY 22 2011

WIZ005-010>013-018>022-030-031-035>040-045-048>050-073-074-231715-
VILAS-ONEIDA-FOREST-FLORENCE-NORTHERN MARINETTE-LINCOLN-LANGLADE-
MENOMINEE-NORTHERN OCONTO-DOOR-MARATHON-SHAWANO-WOOD-PORTAGE-
WAUPACA-OUTAGAMIE-BROWN-KEWAUNEE-WAUSHARA-WINNEBAGO-CALUMET-
MANITOWOC-SOUTHERN MARINETTE-SOUTHERN OCONTO-
1203 PM CDT SUN MAY 22 2011

...SEVERE WEATHER OUTBREAK POSSIBLE THIS AFTERNOON AND THIS
EVENING...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL AND NORTHEAST
WISCONSIN.

.DAY ONE...THIS AFTERNOON AND TONIGHT

A SIGNIFICANT OUTBREAK OF SEVERE THUNDERSTORMS IS POSSIBLE THIS
AFTERNOON AND EVENING. THE PRIMARY RISK IS OF LARGE HAIL AND
DAMAGING WINDS. BUT THERE IS ALSO A RISK OF TORNADOES. OVER
CENTRAL AND NORTH-CENTRAL WISCONSIN...THE GREATEST RISK WILL
OCCUR FROM 200 PM TO 800 PM. OVER THE EAST...THE GREATEST RISK
WILL OCCUR FROM 400 PM THROUGH 1100 PM.

A STRONG UPPER-LEVEL STORM SYSTEM MOVING TOWARD THE AREA FROM THE
WEST IS EXPECTED TO INITIATE SEVERE THUNDERSTORMS OVER SOUTHEAST
MINNESOTA AND WESTERN WISCONSIN DURING THE EARLY TO MIDDLE
AFTERNOON HOURS. THE STORMS ARE EXPECTED TO ORGANIZE INTO A LARGE
COMPLEX OF SEVERE STORMS AND MOVE EAST INTO THE AREA. THE COMPLEX
IS LIKELY TO PRODUCE DAMAGING WINDS AND LARGE HAIL. BUT TORNADOES
WILL ALSO BE POSSIBLE...ESPECIALLY IF A FEW DISCRETE STORMS ARE
ABLE TO DEVELOP AND REACH THE AREA BEFORE ORGANIZING INTO THE
COMPLEX.

AS A RESULT OF THE SEVERE WEATHER POTENTIAL...THE STORM PREDICTION
CENTER HAS POSTED A MODERATE RISK FOR SEVERE THUNDERSTORMS SOUTH
AND WEST OF A LINE FROM WAUSAU TO OSHKOSH...AND A SLIGHT RISK
ACROSS THE REMAINDER OF THE AREA.

AREAS OF DENSE FOG WILL PERSIST NEAR LAKE MICHIGAN TODAY AND
POSSIBLY INTO THIS EVENING.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

ISOLATED THUNDERSTORMS ARE EXPECTED MONDAY...BUT THOSE STORMS ARE
NOT EXPECTED TO BE SEVERE.

FROST IS POSSIBLE AWAY FROM LAKE MICHIGAN TUESDAY NIGHT...WEDNESDAY
NIGHT...AND THURSDAY NIGHT.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL BE NEEDED THIS AFTERNOON AND THIS EVENING.

LMZ521-522-541>543-231715-
THE BAY OF GREEN BAY SOUTH OF A LINE FROM CEDAR RIVER MI TO ROCK
ISLAND PASSAGE-LAKE MICHIGAN FROM WASHINGTON ISLAND TO SHEBOYGAN-
1203 PM CDT SUN MAY 22 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHWEST LAKE
MICHIGAN AND THE WATERS OF GREEN BAY.

.DAY ONE...THIS AFTERNOON AND TONIGHT

THUNDERSTORMS...SOME SEVERE...ARE POSSIBLE LATE THIS AFTERNOON AND
THIS EVENING. AREAS OF DENSE FOG ARE LIKELY TO PERSIST THROUGH THE
EVENING.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

ISOLATED THUNDERSTORMS ARE EXPECTED MONDAY...BUT THOSE STORMS ARE
NOT EXPECTED TO BE SEVERE. CONDITIONS HAZARDOUS TO SMALL CRAFT
ARE POSSIBLE MONDAY.

EB

In the hours before

Local storm report, May 22, 6:34 PM CDT, 22 minutes before

PRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE GREEN BAY WI
634 PM CDT SUN MAY 22 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0629 PM     TORNADO          5 S WISCONSIN RAPIDS    44.33N 89.84W
05/22/2011                   WOOD               WI   LAW ENFORCEMENT

            SEVERAL REPORTS OF MAJOR DAMAGE. TORNADO WENT THROUGH
            GRAND RAPIDS. LOCATION ESTIMATED.

&&

BERSCH

Local storm report, May 22, 6:35 PM CDT, 21 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREEN BAY WI
635 PM CDT SUN MAY 22 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0635 PM     HAIL             PLOVER                  44.45N 89.53W
05/22/2011  E1.25 INCH       PORTAGE            WI   TRAINED SPOTTER

&&

TOMH

Local storm report, May 22, 6:36 PM CDT, 20 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREEN BAY WI
636 PM CDT SUN MAY 22 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0636 PM     HAIL             PLOVER                  44.45N 89.53W
05/22/2011  M1.00 INCH       PORTAGE            WI   TRAINED SPOTTER

            COVERING THE GROUND.

&&

SAC

Local storm report, May 22, 6:39 PM CDT, 17 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREEN BAY WI
639 PM CDT SUN MAY 22 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0638 PM     TORNADO          4 S PLOVER              44.39N 89.53W
05/22/2011                   PORTAGE            WI   TRAINED SPOTTER

            TORNADO ON THE GROUND

&&

TOMH

Local storm report, May 22, 6:42 PM CDT, 14 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREEN BAY WI
642 PM CDT SUN MAY 22 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0630 PM     HAIL             KELLNER                 44.34N 89.71W
05/22/2011  M1.75 INCH       PORTAGE            WI   TRAINED SPOTTER

&&

BERSCH

Local storm report, May 22, 6:54 PM CDT, 2 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREEN BAY WI
654 PM CDT SUN MAY 22 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0635 PM     HAIL             PLOVER                  44.45N 89.53W
05/22/2011  E2.00 INCH       PORTAGE            WI   CO-OP OBSERVER

&&

TERIE

The office that day

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

Issued	Product	Office	Counties	Lasted
May 22, 2:23 PM CDT	Severe Thunderstorm Warning	GRB	Marathon, Portage, Wood	52 min
May 22, 2:54 PM CDT	Severe Thunderstorm Warning	GRB	Waushara	51 min
May 22, 3:14 PM CDT	Severe Thunderstorm Warning	GRB	Portage, Waupaca	46 min
May 22, 3:30 PM CDT	Severe Thunderstorm Warning	GRB	Winnebago	45 min
May 22, 3:45 PM CDT	Severe Thunderstorm Warning	GRB	Waushara	30 min
May 22, 3:48 PM CDT	Tornado Warning	GRB	Outagamie, Waupaca, Winnebago	42 min
May 22, 3:53 PM CDT	Severe Thunderstorm Warning	GRB	Portage, Waupaca	37 min
May 22, 4:29 PM CDT	Severe Thunderstorm Warning	GRB	Outagamie	46 min
May 22, 4:47 PM CDT	Severe Thunderstorm Warning	GRB	Brown	43 min
May 22, 4:54 PM CDT	Special Marine Warning	GRB		96 min
May 22, 5:00 PM CDT	Areal Flood Advisory	GRB	Brown, Outagamie	73 min
May 22, 5:02 PM CDT	Severe Thunderstorm Warning	GRB	Brown, Calumet, Outagamie, Winnebago	32 min
May 22, 5:14 PM CDT	Severe Thunderstorm Warning	GRB	Outagamie	17 min
May 22, 5:29 PM CDT	Severe Thunderstorm Warning	GRB	Brown, Door, Kewaunee	61 min
May 22, 5:32 PM CDT	Severe Thunderstorm Warning	GRB	Wood	43 min
May 22, 5:45 PM CDT	Tornado Warning	GRB	Portage, Wood	45 min
May 22, 5:51 PM CDT	Special Marine Warning	GRB		84 min
May 22, 6:00 PM CDT	Severe Thunderstorm Warning	GRB	Door	46 min
May 22, 6:18 PM CDT	Tornado Warning	GRB	Portage, Waupaca, Wood	42 min
May 22, 6:35 PM CDT	Tornado Warning	GRB	Oneida, Vilas	55 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.