Alert archive / Wisconsin / Tornado Warnings in 2008

Tornado Warning 7, NWS Green Bay, WI

July 20, 2008Door County, Wisconsin

NWS Green Bay, WI issued this tornado warning at Jul 20, 2008, 10:08 PM CDT for Door County, Wisconsin. It was in force for 22 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 20, 2008, 10:08 PM CDT (03:08 UTC)
Expired: Jul 20, 2008, 10:30 PM CDT
In force: 22 min
Issued by: NWS Green Bay, WI
Area: Storm-based polygon

County Door County, WI

The radar

The Green Bay radar (KGRB), 64 km from the middle of the area, began a volume at 03:09 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 20, 10:13 PM CDT	TSTM WND DMG	2 Se Maplewood, WI	THUNDERSTORM WINDS...LIKELY THE REAR-FLANK DOWNDRAFT... SNAPPED SEVERAL TEN TO TWELVE INCH DIAMETER TREES.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 00:00Z, 3.1 hours before the alert went out and 64 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: 917 J/kg
Mixed-layer CIN: -30 J/kg
Mixed-layer LCL: 1188 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 16 m²/s²
0-3 km storm-relative helicity: 55 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

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

000 
WFUS53 KGRB 210308
TORGRB
WIC029-210330-
/O.NEW.KGRB.TO.W.0007.080721T0308Z-080721T0330Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE GREEN BAY WI
1008 PM CDT SUN JUL 20 2008

THE NATIONAL WEATHER SERVICE IN GREEN BAY HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHERN DOOR COUNTY IN NORTHEAST WISCONSIN...

* UNTIL 1030 PM CDT

* AT 1005 PM CDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM
  CAPABLE OF PRODUCING A TORNADO 6 MILES WEST OF STURGEON BAY...
  MOVING SOUTHEAST AT 36 MPH.

* THE TORNADO WILL BE NEAR...
  CLAY BANKS BY 1020 PM...

DOPPLER RADAR INDICATES STRONG ROTATION WITH THE STORM. A TORNADO MAY
ALREADY BE ON THE GROUND...OR IS EXPECTED TO DEVELOP SHORTLY. IF YOU
ARE IN THE PATH OF THIS DANGEROUS STORM...MOVE INDOORS AND TO THE
LOWEST LEVEL OF THE BUILDING AND STAY AWAY FROM WINDOWS. IF
DRIVING...DO NOT SEEK SHELTER UNDER A HIGHWAY OVERPASS.

LAT...LON 4474 8732 4471 8732 4468 8736 4472 8765
      4487 8754 4488 8748 4489 8746 4480 8727
TIME...MOT...LOC 0308Z 312DEG 31KT 4478 8747

$$
TH

2 follow-up statements

000 
WWUS53 KGRB 210314
SVSGRB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREEN BAY WI
1014 PM CDT SUN JUL 20 2008

WIC029-210330-
/O.CON.KGRB.TO.W.0007.000000T0000Z-080721T0330Z/
DOOR-
1013 PM CDT SUN JUL 20 2008

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1030 PM CDT FOR 
SOUTHERN DOOR COUNTY...

AT 1009 PM...DOPPLER RADAR CONTINUED TO INDICATE A TORNADO. THIS
TORNADO WAS LOCATED NEAR MAPLEWOOD...OR 6 MILES SOUTHWEST OF STURGEON
BAY...AND MOVING SOUTHEAST AT 30 MPH.

* THE TORNADO WILL BE NEAR...
  CLAY BANKS BY 1020 PM...

DOPPLER RADAR INDICATES STRONG ROTATION WITH THE STORM. A TORNADO MAY
ALREADY BE ON THE GROUND...OR IS EXPECTED TO DEVELOP SHORTLY. IF YOU
ARE IN THE PATH OF THIS DANGEROUS STORM...MOVE INDOORS AND TO THE
LOWEST LEVEL OF THE BUILDING AND STAY AWAY FROM WINDOWS. IF
DRIVING...DO NOT SEEK SHELTER UNDER A HIGHWAY OVERPASS.

LAT...LON 4474 8732 4471 8732 4468 8736 4472 8765
      4487 8754 4488 8748 4489 8746 4480 8727
TIME...MOT...LOC 0313Z 315DEG 32KT 4474 8743

$$
TH

000 
WWUS53 KGRB 210330
SVSGRB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREEN BAY WI
1030 PM CDT SUN JUL 20 2008

WIC029-210339-
/O.EXP.KGRB.TO.W.0007.000000T0000Z-080721T0330Z/
DOOR-
1029 PM CDT SUN JUL 20 2008

...THE TORNADO WARNING FOR SOUTHERN DOOR COUNTY WILL EXPIRE AT 1030 
PM CDT...

THE SEVERE THUNDERSTORM THAT PROMPTED THE WARNING HAS MOVED OUT OF 
THE AREA.  

GUSTY WINDS AND SMALL HAIL ARE STILL POSSIBLE WITH OTHER STORMS 
LATER THIS EVENING. 

LAT...LON 4474 8732 4471 8732 4468 8736 4472 8765
      4487 8754 4488 8748 4489 8746 4480 8727
TIME...MOT...LOC 0329Z 315DEG 32KT 4464 8729

$$
TH

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 20, 7:30 PM CDT	Severe Thunderstorm Warning	GRB	Forest	45 min
Jul 20, 8:35 PM CDT	Severe Thunderstorm Warning	GRB	Marinette, Oconto	55 min
Jul 20, 8:52 PM CDT	Severe Thunderstorm Warning	GRB	Forest, Marinette	53 min
Jul 20, 9:07 PM CDT	Severe Thunderstorm Warning	GRB	Marinette	38 min
Jul 20, 9:20 PM CDT	Special Marine Warning	GRB		85 min
Jul 20, 9:39 PM CDT	Severe Thunderstorm Warning	GRB	Marinette, Oconto	36 min
Jul 20, 9:45 PM CDT	Severe Thunderstorm Warning	GRB	Door	47 min
Jul 20, 10:15 PM CDT	Severe Thunderstorm Warning	GRB	Marinette	15 min
Jul 21, 4:47 PM CDT	Severe Thunderstorm Warning	GRB	Marathon	28 min
Jul 21, 5:27 PM CDT	Areal Flood Advisory	GRB	Marathon, Portage, Shawano, Waupaca, Wood	63 min

Nearby

Tornado Warnings in Wisconsin, 2008 Every tornado warning in 2008 Tornadoes in 2008

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.