Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 9, NWS Green Bay, WI

May 20, 2012Forest County, Wisconsin

NWS Green Bay, WI issued this severe thunderstorm warning at May 20, 2012, 3:22 PM CDT for Forest County, Wisconsin. It was in force for 53 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: May 20, 2012, 3:22 PM CDT (20:22 UTC)
Expired: May 20, 2012, 4:15 PM CDT
In force: 53 min
Issued by: NWS Green Bay, WI
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

County Forest County, WI

The radar

The Marquette radar (KMQT), 125 km from the middle of the area, began a volume at 20:22 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 20, 3:30 PM CDT	HAIL 0.88	Wabeno, WI	30 TO 35 MPH WINDS WITH TSTM

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 20, 12:24 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 8.4 hours before the alert went out and 156 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: 752 J/kg
Mixed-layer CIN: -121 J/kg
Mixed-layer LCL: 1614 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 51 m²/s²
0-3 km storm-relative helicity: 31 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.

282 
WUUS53 KGRB 202022
SVRGRB
WIC041-202115-
/O.NEW.KGRB.SV.W.0009.120520T2022Z-120520T2115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GREEN BAY WI
322 PM CDT SUN MAY 20 2012

THE NATIONAL WEATHER SERVICE IN GREEN BAY HAS ISSUED A

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

* UNTIL 415 PM CDT

* AT 320 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
  HAIL.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM 15
  MILES WEST OF TIPLER TO 5 MILES NORTHWEST OF WHITE LAKE...AND
  MOVING NORTHEAST AT 30 MPH.

* LOCATIONS IMPACTED INCLUDE...
  CARTER...ARGONNE...ALVIN...LAONA...WABENO...NEWALD...CAVOUR AND
  BLACKWELL.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE PATH OF THESE STORMS...PREPARE IMMEDIATELY FOR
LARGE HAIL AND DAMAGING WINDS. MOVE TO AN INTERIOR ROOM OF YOUR HOME
OR BUSINESS. HEAVY RAINS CAN FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO
AREAS WHERE MOVING WATER COVERS THE ROAD.

&&

LAT...LON 4603 8882 4604 8878 4602 8877 4603 8873
      4602 8868 4572 8868 4572 8846 4541 8843
      4538 8849 4538 8892 4546 8892 4546 8905
      4598 8905 4598 8894 4607 8893
TIME...MOT...LOC 2022Z 211DEG 25KT 4585 8892 4521 8885
WIND...HAIL <50MPH 1.00IN

$$

TH

3 follow-up statements

736 
WWUS53 KGRB 202039
SVSGRB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREEN BAY WI
339 PM CDT SUN MAY 20 2012

WIC041-202115-
/O.CON.KGRB.SV.W.0009.000000T0000Z-120520T2115Z/
FOREST WI-
339 PM CDT SUN MAY 20 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR FOREST COUNTY
UNTIL 415 PM CDT...

AT 337 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE HAIL. 
THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM 5 MILES
SOUTHEAST OF PHELPS TO 6 MILES NORTH OF CARTER...MOVING NORTHEAST AT
30 MPH.

LOCATIONS IMPACTED INCLUDE...
  LAONA...CRANDON...CAVOUR...NEWALD AND ALVIN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE PATH OF THESE STORMS...PREPARE IMMEDIATELY FOR 
LARGE HAIL AND POSSIBLY DAMAGING WINDS. MOVE TO AN INTERIOR ROOM OF 
YOUR HOME OR BUSINESS. HEAVY RAINS CAN FLOOD ROADS QUICKLY SO DO NOT 
DRIVE INTO AREAS WHERE MOVING WATER COVERS THE ROAD.

&&

LAT...LON 4603 8882 4604 8878 4602 8877 4603 8873
      4602 8868 4572 8868 4572 8846 4541 8843
      4538 8849 4538 8892 4546 8892 4546 8905
      4598 8905 4598 8894 4607 8893
TIME...MOT...LOC 2038Z 211DEG 25KT 4599 8903 4548 8859
WIND...HAIL <50MPH 1.00IN

$$

TH

548 
WWUS53 KGRB 202107
SVSGRB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREEN BAY WI
407 PM CDT SUN MAY 20 2012

WIC041-202115-
/O.CON.KGRB.SV.W.0009.000000T0000Z-120520T2115Z/
FOREST WI-
407 PM CDT SUN MAY 20 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR FOREST COUNTY
UNTIL 415 PM CDT...

AT 403 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE HAIL. 
THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM 10 MILES
NORTHEAST OF PHELPS TO 6 MILES WEST OF GOODMAN...MOVING NORTHEAST AT
30 MPH.

LOCATIONS IMPACTED INCLUDE...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR LARGE 
HAIL WITH DAMAGING WINDS POSSIBLE. MOVE TO AN INTERIOR ROOM OF YOUR 
HOME OR BUSINESS. HEAVY RAINS CAN FLOOD ROADS QUICKLY SO DO NOT 
DRIVE INTO AREAS WHERE MOVING WATER COVERS THE ROAD.

&&

LAT...LON 4603 8882 4604 8878 4602 8877 4603 8873
      4602 8868 4572 8868 4572 8846 4541 8843
      4538 8849 4538 8892 4546 8892 4546 8905
      4598 8905 4598 8894 4607 8893
TIME...MOT...LOC 2106Z 211DEG 25KT 4616 8889 4565 8845
WIND...HAIL <50MPH 1.00IN

$$

TH

254 
WWUS53 KGRB 202114
SVSGRB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREEN BAY WI
414 PM CDT SUN MAY 20 2012

WIC041-202124-
/O.EXP.KGRB.SV.W.0009.000000T0000Z-120520T2115Z/
FOREST WI-
414 PM CDT SUN MAY 20 2012

...THE SEVERE THUNDERSTORM WARNING FOR FOREST COUNTY WILL EXPIRE AT
415 PM CDT...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAS WEAKENED BELOW 
SEVERE LIMITS.

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A SEVERE 
THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM CDT.

LAT...LON 4603 8882 4604 8878 4602 8877 4603 8873
      4602 8868 4572 8868 4572 8846 4541 8843
      4538 8849 4538 8892 4546 8892 4546 8905
      4598 8905 4598 8894 4607 8893
TIME...MOT...LOC 2114Z 211DEG 25KT 4621 8885 4570 8841

$$

TH

The office that day

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

Issued	Product	Office	Counties	Lasted
May 20, 1:32 PM CDT	Severe Thunderstorm Warning	GRB	Oneida, Vilas	58 min
May 20, 1:55 PM CDT	Severe Thunderstorm Warning	GRB	Lincoln, Marathon	50 min
May 20, 2:40 PM CDT	Severe Thunderstorm Warning	GRB	Oneida, Vilas	65 min
May 20, 2:53 PM CDT	Severe Thunderstorm Warning	GRB	Langlade	67 min
May 20, 3:56 PM CDT	Severe Thunderstorm Warning	GRB	Langlade, Menominee, Oconto	49 min
May 20, 3:58 PM CDT	Severe Thunderstorm Warning	GRB	Florence	32 min
May 20, 4:10 PM CDT	Small Craft Advisory	GRB		5 hr
May 20, 4:21 PM CDT	Severe Thunderstorm Warning	GRB	Forest, Langlade, Marinette, Oconto	39 min
May 20, 4:56 PM CDT	Severe Thunderstorm Warning	GRB	Marinette	17 min
May 20, 5:38 PM CDT	Severe Thunderstorm Warning	GRB	Marinette	50 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.