Alert archive / Wisconsin / Special Weather Statements in 2017

Special Weather Statement, NWS Green Bay, WI

June 20, 2017Oconto County, Wisconsin

NWS Green Bay, WI issued this special weather statement at Jun 20, 2017, 12:54 PM CDT for Oconto County, Wisconsin. It was in force for 66 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: Jun 20, 2017, 12:54 PM CDT (17:54 UTC)
Expired: Jun 20, 2017, 2:00 PM CDT
In force: 66 min
Issued by: NWS Green Bay, WI

County Oconto County, WI

The radar

The Green Bay radar (KGRB), 72 km from the middle of the area, began a volume at 17:57 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, 5.9 hours before the alert went out and 74 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: 2 J/kg
Mixed-layer CIN: -79 J/kg
Mixed-layer LCL: 1410 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 95 m²/s²
0-3 km storm-relative helicity: 111 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 Jun 20, 12:19 PM CDT, 35 minutes earlier.

Area forecast discussion, Jun 20, 12:19 PM CDT, 35 minutes before

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Hazardous weather outlook, Jun 20, 3:37 AM CDT, 9 hours 17 minutes before

Hazardous Weather Outlook
National Weather Service Green Bay WI
337 AM CDT Tue Jun 20 2017

WIZ005-010>013-018>022-030-031-035>040-045-048>050-073-074-210845-
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-
337 AM CDT Tue Jun 20 2017

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

.DAY ONE...Today and Tonight

There is a chance of thunderstorms today, but severe weather is
not expected at this time.

Due to recent heavy rains, many streams and rivers are flowing
faster than normal. Boaters and fishermen should use caution due
to fast flows.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

Thunderstorms are expected Wednesday evening into Thursday
morning. There is a marginal risk of severe storms Wednesday
night, mainly southwest of a line from Rhinelander to Green Bay.
Large hail and damaging winds are expected to be the main severe
threats.

Another round of thunderstorms are forecast for Thursday afternoon
into Thursday night as a cold front slowly settles to the south.
There is a marginal risk of severe storms, mainly south of a line
from Marshfield to Green Bay. Large hail and damaging winds are
again the primary threats.

Thunderstorms are possible during the upcoming weekend into early
next week, primarily during the afternoon hours. It is too early
to determine whether any of these storms could become severe.

.SPOTTER INFORMATION STATEMENT...

Spotter activation should not be needed today or tonight.

LMZ521-522-541>543-210845-
The Bay of Green Bay south of a line from Cedar River MI to Rock
Island Passage-Lake Michigan from Washington Island to Sheboygan-
337 AM CDT Tue Jun 20 2017

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

.DAY ONE...Today and Tonight

There is a chance of thunderstorms today, but severe weather is
not expected at this time.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

Thunderstorms are expected Wednesday night into Thursday morning.
These storms could produce strong winds and large hail.

Thunderstorms are also forecast for Thursday afternoon into
Thursday night. Strong winds and large hail are again possible.

Thunderstorms are possible during the upcoming weekend into Monday,
but it is too early to tell if they will become severe.

RDM/AK

In the hours before

Special weather statement, Jun 20, 11:32 AM CDT, 1 hour 22 minutes before

Special Weather Statement
National Weather Service Green Bay WI
1132 AM CDT TUE JUN 20 2017

WIZ011-013-021-073-201715-
Southern Marinette County WI-Northern Oconto County WI-Forest WI-
Northern Marinette County WI-
1132 AM CDT TUE JUN 20 2017

...SCATTERED SHOWERS AND THUNDERSTORMS DEVELOPING ACROSS CENTRAL
MARINETTE AND SOUTHEAST FOREST COUNTIES...

At 1131 AM CDT, Doppler radar was tracking scattered showers and
thunderstorms from Mc Allister and Wausaukee to near Athelstane.
The scattered showers and storms extended westward to near
Blackwell in southeast Forest County. The showers and thunderstorms
were moving to the southeast around 20 mph.

Pea size hail and winds in excess of 30 mph will be possible with
this storm.

Locations impacted include...
Menominee, Crivitz, Wausaukee, Porterfield, Laona, Middle Inlet,
Amberg, Athelstane, Silver Cliff and Blackwell.

LAT...LON 4519 8840 4559 8878 4551 8780 4547 8781
      4544 8786 4541 8785 4535 8789 4536 8787
      4534 8785 4535 8775 4539 8770 4538 8768
      4534 8765 4529 8769 4517 8774 4513 8768
      4513 8760 4514 8758 4513 8754 4511 8754
TIME...MOT...LOC 1627Z 289DEG 18KT 4532 8758

Eckberg

Special weather statement, Jun 20, 12:54 PM CDT, 0 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 20, 11:32 AM CDT	Special Weather Statement	GRB	Marinette	43 min
Jun 20, 1:42 PM CDT	Special Weather Statement	GRB	Oconto	48 min
Jun 20, 2:55 PM CDT	Special Weather Statement	GRB	Oconto	35 min

Nearby

Special Weather Statements in Wisconsin, 2017 Every special weather statement in 2017

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.