Alert archive / Wisconsin / Special Weather Statements in 2018

Special Weather Statement, NWS Green Bay, WI

July 30, 2018Door County, Kewaunee County, Wisconsin

NWS Green Bay, WI issued this special weather statement at Jul 30, 2018, 11:41 AM CDT for Door County, Kewaunee County, Wisconsin. It was in force for 64 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: Jul 30, 2018, 11:41 AM CDT (16:41 UTC)
Expired: Jul 30, 2018, 12:45 PM CDT
In force: 64 min
Issued by: NWS Green Bay, WI

Counties Door County, WI, Kewaunee County, WI

The radar

The Green Bay radar (KGRB), 86 km from the middle of the area, began a volume at 16:43 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.

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 4.7 hours before the alert went out and 86 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: 319 J/kg
Mixed-layer CIN: -85 J/kg
Mixed-layer LCL: 1300 m above ground
0-6 km bulk shear: 4 kt
0-1 km storm-relative helicity: -5 m²/s²
0-3 km storm-relative helicity: 7 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Jul 30, 4:11 AM CDT, 7 hours 30 minutes earlier.

Area forecast discussion, Jul 30, 4:11 AM CDT, 7 hours 30 minutes before

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</head>
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Hazardous weather outlook, Jul 30, 4:18 AM CDT, 7 hours 23 minutes before

Hazardous Weather Outlook
National Weather Service Green Bay WI
418 AM CDT Mon Jul 30 2018

WIZ005-010>013-018>022-030-031-035>040-045-048>050-073-074-311100-
Vilas-Oneida-Forest-Florence-Northern Marinette County-Lincoln-
Langlade-Menominee-Northern Oconto County-Door-Marathon-Shawano-
Wood-Portage-Waupaca-Outagamie-Brown-Kewaunee-Waushara-Winnebago-
Calumet-Manitowoc-Southern Marinette County-
Southern Oconto County-
418 AM CDT Mon Jul 30 2018

This Hazardous Weather Outlook is for north-central and northeast
Wisconsin.

.DAY ONE...Today and Tonight

Isolated thunderstorms are expected this afternoon. The storms are
not expected to be severe, but could produce brief heavy rain.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

Thunderstorms are possible Wednesday through Wednesday night.
There is a marginal risk of severe storms, mainly during the
afternoon and evening. Strong winds appear to be the main severe
threat.

There is a chance for thunderstorms late Saturday night and
Sunday but it is too early to determine their severe weather
potential.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed today or tonight.

LMZ521-522-541>543-311100-
The Bay of Green Bay south of a line from Cedar River MI to Rock
Island Passage-Lake Michigan from Washington Island to Sheboygan-
418 AM CDT Mon Jul 30 2018

This Hazardous Weather Outlook is for portions of northwest Lake
Michigan and the waters of Green Bay.

.DAY ONE...Today and Tonight

Isolated thunderstorms developing over the land this afternoon
could move over the southern Bay of Green Bay. Any storms that
move over the water will pose a lightning hazard to boaters.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

Thunderstorms are possible Wednesday afternoon and Wednesday night.
and again late Saturday night and Sunday. Any storms that develop
would pose a hazard to mariners.

Skowronski/MG

In the hours before

Special weather statement, Jul 30, 11:41 AM CDT, 0 minutes before

Special Weather Statement
National Weather Service Green Bay WI
1141 AM CDT MON JUL 30 2018

WIZ022-040-301745-
Kewaunee WI-Door WI-
1141 AM CDT MON JUL 30 2018

...SLOW MOVING THUNDERSTORMS ACROSS DOOR AND NORTHERN KEWAUNEE
COUNTIES...

At 1138 AM CDT, Doppler radar was tracking a strong thunderstorm near
Algoma, or 9 miles south of Sturgeon Bay. This storm was nearly
stationary. Other thunderstorms were located near Forestville and
just west of Jacksonport.

Half inch hail, torrential rain and winds in excess of 30 mph will
be possible with these storms.

Locations impacted include...
Sturgeon Bay, Kewaunee, Algoma, Jacksonport, Ephraim, Egg Harbor,
Whitefish Bay, Brussels, Baileys Harbor and Sister Bay.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4516 8697 4510 8695 4501 8710 4486 8715
      4476 8727 4441 8747 4467 8781 4490 8757
      4494 8745 4507 8736 4509 8737 4527 8717
      4520 8692
TIME...MOT...LOC 1638Z 054DEG 0KT 4471 8744

Bersch

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 30, 12:24 PM CDT	Special Weather Statement	GRB	Kewaunee	66 min
Jul 30, 12:49 PM CDT	Special Weather Statement	GRB	Brown	26 min
Jul 30, 1:38 PM CDT	Special Weather Statement	GRB	Manitowoc	22 min
Jul 30, 2:21 PM CDT	Special Weather Statement	GRB	Calumet	24 min
Jul 30, 2:37 PM CDT	Special Weather Statement	GRB	Calumet	23 min
Jul 30, 3:22 PM CDT	Special Weather Statement	GRB	Shawano	38 min

Nearby

Special Weather Statements in Wisconsin, 2018 Every special weather statement in 2018

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.