Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 18, NWS Green Bay, WI

June 17, 20184 counties in Wisconsin

NWS Green Bay, WI issued this severe thunderstorm warning at Jun 17, 2018, 9:12 PM CDT for 4 counties in Wisconsin. It was in force for 51 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: Jun 17, 2018, 9:12 PM CDT (02:12 UTC)
Expired: Jun 17, 2018, 10:03 PM CDT
In force: 51 min
Issued by: NWS Green Bay, WI
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

Counties Brown County, WI, Menominee County, WI, Oconto County, WI, Shawano County, WI

What was reported inside it

Time	Report	Where	Remark
Jun 17, 9:33 PM CDT	TSTM WND GST 50	Krakow, WI

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

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
Jun 17, 3:46 PM CDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 00:00Z, 2.2 hours before the alert went out and 30 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: 1303 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 1550 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 87 m²/s²
0-3 km storm-relative helicity: 181 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 4.6

Open this sounding in Storm Lab

The text

As transmitted.

968 
WUUS53 KGRB 180212
SVRGRB
WIC009-078-083-115-180315-
/O.NEW.KGRB.SV.W.0018.180618T0212Z-180618T0315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Green Bay WI
912 PM CDT SUN JUN 17 2018

The National Weather Service in Green Bay has issued a

* Severe Thunderstorm Warning for...
  Northwestern Brown County in northeastern Wisconsin...
  Southeastern Menominee County in northeastern Wisconsin...
  Southern Oconto County in northeastern Wisconsin...
  Eastern Shawano County in northeastern Wisconsin...

* Until 1015 PM CDT.

* At 912 PM CDT, severe thunderstorms were located along a line
  extending from near Legend Lake to near Shawano to near Embarrass,
  moving east at 40 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Shawano, Oconto, Pulaski, Gillett, Navarino Wildlife Area, Legend
  Lake, Keshena, Howard, Suamico and Little Suamico.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

Prepare immediately for large hail and damaging winds. People outside
should move immediately to shelter inside a strong building. Stay
away from windows.

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4457 8819 4459 8819 4459 8846 4460 8861
      4468 8860 4468 8875 4485 8858 4505 8859
      4499 8791 4495 8773 4491 8775 4490 8777
      4485 8778 4471 8792 4465 8793 4455 8801
TIME...MOT...LOC 0212Z 282DEG 36KT 4494 8849 4482 8849 4471 8874 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH
 
$$

Kurimski

3 follow-up statements

217 
WWUS53 KGRB 180231
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
931 PM CDT SUN JUN 17 2018

WIC078-180241-
/O.CAN.KGRB.SV.W.0018.000000T0000Z-180618T0315Z/
Menominee WI-
931 PM CDT SUN JUN 17 2018

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MENOMINEE COUNTY
IS CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until midnight CDT for
northeastern Wisconsin.

LAT...LON 4457 8819 4459 8819 4459 8846 4460 8861
      4468 8860 4475 8856 4484 8846 4503 8838
      4499 8791 4495 8773 4491 8775 4490 8777
      4485 8778 4471 8792 4465 8793 4455 8801
TIME...MOT...LOC 0231Z 282DEG 36KT 4490 8826 4478 8826 4467 8851 

$$

WIC009-083-115-180315-
/O.CON.KGRB.SV.W.0018.000000T0000Z-180618T0315Z/
Brown WI-Oconto WI-Shawano WI-
931 PM CDT SUN JUN 17 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1015 PM CDT
FOR NORTHWESTERN BROWN...SOUTHERN OCONTO AND EASTERN SHAWANO
COUNTIES...

At 931 PM CDT, severe thunderstorms were located along a line
extending from near Gillett to 8 miles north of Pulaski to near
Navarino Wildlife Area, moving east at 40 mph.

HAZARD...70 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings.

Locations impacted include...
Oconto, Pulaski, Gillett, Navarino Wildlife Area, Howard, Suamico,
Little Suamico, Chase, Oconto Falls and Pittsfield.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

Prepare immediately for large hail and damaging winds. People outside
should move to a shelter, inside a strong building and away from
windows.

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4457 8819 4459 8819 4459 8846 4460 8861
      4468 8860 4475 8856 4484 8846 4503 8838
      4499 8791 4495 8773 4491 8775 4490 8777
      4485 8778 4471 8792 4465 8793 4455 8801
TIME...MOT...LOC 0231Z 282DEG 36KT 4490 8826 4478 8826 4467 8851 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...70MPH
 
$$

Kurimski

142 
WWUS53 KGRB 180249
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
949 PM CDT SUN JUN 17 2018

WIC009-083-115-180315-
/O.CON.KGRB.SV.W.0018.000000T0000Z-180618T0315Z/
Brown WI-Oconto WI-Shawano WI-
949 PM CDT SUN JUN 17 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1015 PM CDT
FOR NORTHWESTERN BROWN...SOUTHERN OCONTO AND EASTERN SHAWANO
COUNTIES...

At 949 PM CDT, severe thunderstorms were located along a line
extending from 7 miles west of Oconto to near Pulaski, moving east at
40 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Oconto, Pulaski, Howard, Suamico, Little Suamico, Chase, Oconto
Falls, Pittsfield, Abrams and Angelica.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for damaging winds. People outside should move 
to a shelter, inside a strong building and away from windows.

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4457 8819 4459 8819 4459 8846 4468 8849
      4483 8827 4501 8812 4499 8791 4495 8773
      4491 8775 4490 8777 4485 8778 4471 8792
      4465 8793 4455 8801
TIME...MOT...LOC 0249Z 282DEG 36KT 4487 8804 4475 8804 4464 8829 

HAIL...<.75IN
WIND...60MPH
 
$$

Kurimski

124 
WWUS53 KGRB 180303
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
1003 PM CDT SUN JUN 17 2018

WIC009-083-115-180312-
/O.CAN.KGRB.SV.W.0018.000000T0000Z-180618T0315Z/
Brown WI-Oconto WI-Shawano WI-
1003 PM CDT SUN JUN 17 2018

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN BROWN...SOUTHERN
OCONTO AND EASTERN SHAWANO COUNTIES IS CANCELLED...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning has been cancelled.  However gusty winds and
heavy rain are still possible with these thunderstorms.

A Severe Thunderstorm Watch remains in effect until midnight CDT for
northeastern Wisconsin.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Green Bay.

LAT...LON 4457 8819 4459 8819 4459 8846 4468 8849
      4483 8827 4501 8812 4499 8791 4495 8773
      4491 8775 4490 8777 4485 8778 4471 8792
      4465 8793 4455 8801
TIME...MOT...LOC 0301Z 282DEG 36KT 4484 8787 4472 8787 4461 8812 

$$

Kurimski

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 Jun 17, 6:51 PM CDT, 2 hours 21 minutes earlier.

Area forecast discussion, Jun 17, 6:51 PM CDT, 2 hours 21 minutes before

Area Forecast Discussion
National Weather Service Green Bay WI
651 PM CDT Sun Jun 17 2018

Updated aviation portion for 00Z TAF issuance

.SHORT TERM...Tonight and Monday
Issued at 322 PM CDT Sun Jun 17 2018

Flood and severe weather potential are the main
concerns tonight and early Monday.

A cold front will move very slowly across the area tonight and
early Monday. Very warm and humid air ahead of the front will
provide showers and storms with the potential for producing very
heavy rains, especially given the slow movement. We added some
counties to the flash flood watch in northern counties. The main
severe storm threat should be strong winds, as temperatures aloft
are not cold for large hail. A brief tornado is not out of the
question along the front though is not expected.

There are model differences about how quickly the front and
associated showers and storms exit the area tomorrow. That will
have an effect on temperatures.

.LONG TERM...Monday Night Through Sunday
Issued at 322 PM CDT Sun Jun 17 2018

Zonal pattern at 500mb will dominate the weather pattern at the
beginning of the period. A northwest flow pattern is expected by
the weekend, allowing for low humidity and seasonable temperatures
as Canadian high pressure moves across the area. Temperatures on
some nights could fall into the 40s at our typical cold spots
across the north later this week.

The cold front will gradually push south of the area Monday
night. However, additional complexes of showers and thunderstorms
are expected which may clip our southern counties Monday night
into Tuesday before the front pushes far enough south of the
area. Canadian high pressure system should dominate the weather
pattern into Friday morning. The next chance of showers and storms
are possible next Friday into the weekend, although confidence
is low in the timing of the rain chances. Some adjustments were
made to max temperatures to account for our warmer biased sites.
Did lower minimum temperatures on a few nights later in the week
across the north to account for our typical cold spots.
&&

.AVIATION...for 00Z TAF Issuance
Issued at 639 PM CDT Sun Jun 17 2018

Strong and locally severe thunderstorms with gusty winds and
torrential rain were ongoing over north central and far northeast
WI early this evening. These will continue to sag southeast
across the region this evening and overnight, with the
precipitation eventually shifting south of the region on Monday.
The combination of steady rains and the arrival of a cold front
will cause ceilings to lower to MVFR/local IFR overnight into
early Monday, but some improvement should occur by midday Monday.

LLWS will occur this evening, then taper off overnight. Southwest
winds will shift north to northeast after the cold front passes.

&&

.GRB WATCHES/WARNINGS/ADVISORIES...
Flash Flood Watch through Monday afternoon for WIZ005-010>013-
018-019-021-030-073.
&&

SHORT TERM.....RDM
LONG TERM......Eckberg
AVIATION.......Kieckbusch

Hazardous weather outlook, Jun 17, 3:12 PM CDT, 6 hours before

Hazardous Weather Outlook
National Weather Service Green Bay WI
312 PM CDT Sun Jun 17 2018

WIZ005-010>013-018>022-030-031-035>040-045-048>050-073-074-182015-
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-
312 PM CDT Sun Jun 17 2018

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

.DAY ONE...Tonight

Thunderstorms are expected across the area later this afternoon
and tonight. A few storms could become severe, especially north
of Highway 10. Damaging winds are the main severe weather threat.

A flash flood watch is in effect for much of central and northern
Wisconsin, where recent heavy rains have left the ground nearly
saturated and rivers and stream levels high.

.DAYS TWO THROUGH SEVEN...Monday through Sunday

Scattered thunderstorms are forecast for Monday morning. A few
strong storms with gusty winds and heavy rain are possible early.

There is a chance of thunderstorms on Friday into next weekend.
It is too early to determine if any of these storms would become
severe.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed tonight.

LMZ521-522-541>543-182015-
The Bay of Green Bay south of a line from Cedar River MI to Rock
Island Passage-Lake Michigan from Washington Island to Sheboygan-
312 PM CDT Sun Jun 17 2018

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

.DAY ONE...Tonight

Scattered thunderstorms will pose a hazard to boaters on the lake
and bay at times tonight. Dense fog is also possible at times.

.DAYS TWO THROUGH SEVEN...Monday through Sunday

There is a chance of thunderstorms into Monday, and again late in
the week.

RDM/Eckberg

In the hours before

Local storm report, Jun 17, 8:09 PM CDT, 1 hour 3 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREEN BAY WI
809 PM CDT SUN JUN 17 2018

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

0805 PM     TSTM WND GST     DANCY                   44.68N 89.69W
06/17/2018  E65 MPH          PORTAGE            WI   TRAINED SPOTTER

&&

BERSCH

Local storm report, Jun 17, 8:10 PM CDT, 1 hour 2 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREEN BAY WI
810 PM CDT SUN JUN 17 2018

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

0755 PM     TSTM WND GST     MOSINEE                 44.78N 89.69W
06/17/2018  M55 MPH          MARATHON           WI   AWOS

&&

BERSCH

Local storm report, Jun 17, 8:44 PM CDT, 28 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREEN BAY WI
844 PM CDT SUN JUN 17 2018

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

0800 PM     FUNNEL CLOUD     HALDER                  44.79N 89.86W
06/17/2018                   MARATHON           WI   TRAINED SPOTTER

&&

BERSCH

Special weather statement, Jun 17, 8:51 PM CDT, 21 minutes before

Special Weather Statement
National Weather Service Green Bay WI
851 PM CDT SUN JUN 17 2018

WIZ022-073-074-180245-
Southern Oconto County WI-Southern Marinette County WI-Door WI-
851 PM CDT SUN JUN 17 2018

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN MARINETTE...DOOR AND
CENTRAL OCONTO COUNTIES UNTIL 945 PM CDT...

At 851 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Newport State Park to near Menominee to
near Oconto. Movement was east at 30 mph.

Pea size hail and winds in excess of 40 mph will be possible with
these storms.

Strong thunderstorms will be near...
  Newport State Park around 900 PM CDT.
  Egg Harbor around 925 PM CDT.
  Ephraim around 930 PM CDT.
  Jacksonport around 940 PM CDT.
  Sturgeon Bay around 945 PM CDT.

Other locations impacted by these storms include Peninsula Center,
Fish Creek, Cullen, Peninsula State Park, Valmy, County Line,
Harmony, Ellison Bay, Peshtigo and Whitefish Bay.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

A Severe Thunderstorm Watch remains in effect until midnight CDT for
northeastern Wisconsin.

LAT...LON 4510 8695 4501 8710 4466 8734 4480 8771
      4494 8767 4493 8772 4483 8780 4492 8803
      4516 8772 4512 8754 4507 8752 4487 8765
      4493 8746 4507 8736 4521 8742 4522 8721
      4541 8700 4543 8681 4542 8681
TIME...MOT...LOC 0151Z 290DEG 25KT 4528 8704 4519 8758 4495 8789

Kurimski

Local storm report, Jun 17, 9:02 PM CDT, 10 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREEN BAY WI
902 PM CDT SUN JUN 17 2018

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

0645 PM     TSTM WND DMG     N ARGONNE               45.66N 88.88W
06/17/2018                   FOREST             WI   PUBLIC

            STORMS DESTROYED BIRD PENS JUST NORTH OF ARGONNE. TIME
            ESTIMATED. REPORT VIA SOCIAL MEDIA.

&&

KLB

Local storm report, Jun 17, 9:05 PM CDT, 7 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREEN BAY WI
905 PM CDT SUN JUN 17 2018

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

0841 PM     TSTM WND DMG     1 SSW BOWLER            44.84N 88.98W
06/17/2018                   SHAWANO            WI   LAW ENFORCEMENT

            FEW TREES DOWN. COUNTY D AND J.

0848 PM     TSTM WND DMG     TIGERTON                44.73N 89.05W
06/17/2018                   SHAWANO            WI   LAW ENFORCEMENT

            A FEW TREES DOWN

&&

BERSCH

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 17, 7:06 PM CDT	Special Weather Statement	GRB	Lincoln, Marathon, Portage, Wood	39 min
Jun 17, 7:17 PM CDT	Severe Thunderstorm Warning	GRB	Marathon, Portage, Wood	88 min
Jun 17, 7:20 PM CDT	Severe Thunderstorm Warning	GRB	Langlade	40 min
Jun 17, 8:11 PM CDT	Special Marine Warning	GRB		2 hr
Jun 17, 8:16 PM CDT	Severe Thunderstorm Warning	GRB	Langlade, Menominee, Oconto, Shawano	59 min
Jun 17, 8:17 PM CDT	Severe Thunderstorm Warning	GRB	Marinette	31 min
Jun 17, 8:51 PM CDT	Special Weather Statement	GRB	Door	54 min
Jun 17, 9:19 PM CDT	Special Marine Warning	GRB		116 min
Jun 17, 9:24 PM CDT	Tornado Warning	GRB	Oconto, Shawano	24 min
Jun 17, 10:01 PM CDT	Special Weather Statement	GRB	Brown, Kewaunee	59 min
Jun 17, 10:25 PM CDT	Special Weather Statement	GRB	Waupaca	65 min
Jun 17, 10:56 PM CDT	Special Weather Statement	GRB	Outagamie, Portage, Waupaca, Waushara, Winnebago, Wood	49 min
Jun 17, 11:48 PM CDT	Special Weather Statement	GRB	Winnebago	27 min
Jun 18, 12:19 AM CDT	Special Weather Statement	GRB	Calumet, Manitowoc	41 min
Jun 18, 12:51 AM CDT	Special Weather Statement	GRB	Brown, Calumet, Manitowoc, Outagamie, Portage, Waupaca and 3 more	84 min
Jun 18, 2:43 AM CDT	Areal Flood Advisory	GRB	Outagamie, Portage, Waupaca, Waushara, Winnebago, Wood	6 hr
Jun 18, 10:21 AM CDT	River Flood Warning	GRB	Oneida	35 hr
Jun 18, 11:30 AM CDT	River Flood Warning	GRB	Waupaca	5 days
Jun 18, 11:32 AM CDT	River Flood Warning	GRB	Waupaca	3 days
Jun 18, 3:52 PM CDT	River Flood Advisory	GRB	Oneida	36 hr

Nearby

Severe Thunderstorm Warnings in Wisconsin, 2018 Every severe thunderstorm warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive.