Severe Thunderstorm Warning 150, NWS Chicago, IL

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Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
356 PM CDT Thu Aug 3 2017

ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
042100-
Winnebago-Boone-McHenry-Lake Illinois-Ogle-Lee-De Kalb-Kane-
DuPage-Cook-La Salle-Kendall-Grundy-Will-Kankakee-Livingston-
Iroquois-Ford-Lake Indiana-Porter-Newton-Jasper-Benton-
356 PM CDT Thu Aug 3 2017 /456 PM EDT Thu Aug 3 2017/

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL ILLINOIS...
NORTHEAST ILLINOIS AND NORTHWEST INDIANA.

.DAY ONE...Tonight.

WEATHER HAZARDS EXPECTED:
  Elevated Thunderstorm Risk...with an associated:
  Limited Tornado Risk.
  Elevated Hail Risk...up to quarter size.
  Elevated Thunderstorm Wind Damage Risk...up to 70 MPH.
  Limited Flooding Risk.

DISCUSSION:

Widely scattered  to scattered thunderstorms will continue through
this evening. Storm coverage and intensity will increase through
the late afternoon into the evening hours. One general area of
thunderstorms over northeastern and east-central Illinois into
northwest Indiana will continue to push east, with chances for
marginally severe hail, strong, damaging wind gusts and heavy
downpours. Localized flooding will be possible.

Another line of storms developing just west of the Mississippi
River along a cold front will push into northwestern Illinois by
early evening and then push east across the outlook area. With
this line, the most likely hazards are damaging winds and quarter
size hail. There is a low, but non-zero, risk of a tornado as
well, should some storms develop supercell characteristics. The
thunderstorm threat will end from west to east during the late
evening hours and come to an end by around midnight tonight.

In addition, portions of the Pecatonica River will remain in
flood.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Sunday and Monday...
  Limited Thunderstorm Risk.
Wednesday...
  Limited Thunderstorm Risk.

.SPOTTER INFORMATION STATEMENT...

Spotters will likely be needed this afternoon through this
evening.

GENERAL STORM MOTION OF THE DAY:

East at 30 mph.

&&

LMZ740>745-042100-
Winthrop Harbor to Wilmette Harbor-
Wilmette Harbor to Northerly Island-
Northerly Island to Calumet Harbor-Calumet Harbor to Gary-
Gary to Burns Harbor-Burns Harbor to Michigan City-
356 PM CDT Thu Aug 3 2017

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE ILLINOIS NEARSHORE
WATERS OF LAKE MICHIGAN AND THE INDIANA NEARSHORE WATERS OF LAKE
MICHIGAN.

.DAY ONE...Tonight.

  Elevated Thunderstorm Risk.
  Hazardous Conditions for Small Craft are likely.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Friday...
  Hazardous Conditions for Small Craft are likely.

Sunday and Monday...
  Limited Thunderstorm Risk.

&&

LMZ080-261-362-364-366-563-565-567-669-671-673-675-777-779-868-
870-872-874-876-878-042100-
Lake Michigan from Michigan City IN to St. Joseph MI 5 NM
offshore to Mid Lake-
Lake Michigan from Seul Choix Point to Rock Island Passage 5 NM
offshore to Mid Lake-
Lake Michigan South of a line from Seul Choix Point to the
Mackinac Bridge and north of a line from Charlevoix MI to South
Fox Island 5 NM offshore-
Lake Michigan from Charlevoix to Point Betsie MI 5 NM offshore to
Mid Lake-
Lake Michigan from Point Betsie to Manistee MI 5 NM offshore to
Mid Lake-
Lake Michigan from Rock Island Passage to Sturgeon Bay WI-
Lake Michigan from Sturgeon Bay to Two Rivers WI 5 NM offshore to
Mid Lake-
Lake Michigan from Two Rivers to Sheboygan WI 5 NM offshore to
Mid Lake-
Lake Michigan from Sheboygan to Port Washington WI 5 NM offshore
to Mid Lake-
Lake Michigan from Port Washington to North Point Light WI 5 NM
offshore to Mid Lake-
Lake Michigan from North Point Light to Wind Point WI 5 NM
offshore to Mid Lake-
Lake Michigan from Wind Point WI to Winthrop Harbor IL 5 NM
offshore to Mid Lake-
Lake Michigan from Winthrop Harbor to Wilmette Harbor IL 5 NM
offshore to Mid Lake-
Lake Michigan from Wilmette Harbor IL to Michigan City IN 5 NM
offshore to Mid Lake-
Lake Michigan from Pentwater to Manistee MI 5 NM offshore to Mid
Lake-
Lake Michigan from Whitehall to Pentwater MI 5 NM offshore to Mid
Lake-
Lake Michigan from Grand Haven to Whitehall MI 5 NM offshore to
Mid Lake-
Lake Michigan from Holland to Grand Haven MI 5 NM offshore to Mid
Lake-
Lake Michigan from South Haven to Holland MI 5 NM offshore to Mid
Lake-
Lake Michigan from St. Joseph to South Haven MI 5 NM offshore to
Mid Lake-
356 PM CDT Thu Aug 3 2017

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE OPEN WATERS OF LAKE
MICHIGAN.

.DAY ONE...Tonight.

Thunderstorms are likely, some could be severe through this
evening south of a Bay of Green Bay to Traverse City line.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Gales to 40 kt are likely Friday and Friday night.

There is a chance of thunderstorms and waterspouts Friday and
Friday evening.

There is also a chance of thunderstorms again Sunday and Monday
and again, Wednesday and Thursday.

&&

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Special Weather Statement
National Weather Service Chicago/Romeoville Il
455 PM CDT THU AUG 3 2017

ILZ006-032215-
Lake IL-
455 PM CDT THU AUG 3 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN LAKE COUNTY UNTIL 515 PM
CDT...

At 455 PM CDT, Doppler radar was tracking a strong thunderstorm over
Lindenhurst, or over Venetian Village, moving northeast at 30 mph.

Nickel size hail and wind gusts up to 50 mph will be possible with
this storm.

Locations impacted include...
Waukegan, Gurnee, Zion, Grayslake, Round Lake, Antioch, Beach Park,
Fox Lake, Lake Villa, Gages Lake, Venetian Village, Long Lake,
Pistakee Highlands, Lindenhurst, Lakemoor, Wadsworth, Volo, Third
Lake, Lake Catherine and Grandwood Park.

Including the following interstates...
 I-94 between mile markers 1 and 10.
 I-294 between mile markers 1 and 10.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 4249 8780 4246 8780 4238 8781 4230 8820
      4249 8820 4250 8818 4250 8812
TIME...MOT...LOC 2155Z 241DEG 25KT 4242 8800

RC

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
504 PM CDT THU AUG 03 2017

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

0455 PM     HAIL             NNW LINDENHURST         42.42N 88.03W
08/03/2017  M0.88 INCH       LAKE               IL   COCORAHS

&&

AKREIN

Special Weather Statement
National Weather Service Chicago/Romeoville Il
620 PM CDT THU AUG 3 2017

ILZ003-008-032345-
Winnebago IL-Ogle IL-
620 PM CDT THU AUG 3 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN OGLE AND WESTERN
WINNEBAGO COUNTIES UNTIL 645 PM CDT...

At 620 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Albany to Dakota to near Lanark. Movement
was east at 40 mph.

Half inch to dime sized hail and wind gusts up to 50 mph will be
possible with these storms.

Locations impacted include...
Rockford, Beloit, Rockton, Mount Morris, Winnebago, Pecatonica,
Forreston, Durand, Lake Summerset, Leaf River and Adeline.

LAT...LON 4250 8905 4237 8911 4201 8940 4201 8969
      4220 8969 4220 8940 4250 8940
TIME...MOT...LOC 2320Z 269DEG 35KT 4271 8935 4236 8950 4205 8983

RC

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
637 PM CDT THU AUG 03 2017

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

0555 PM     HAIL             ROUND LAKE PARK         42.32N 88.06W
08/03/2017  E1.00 INCH       LAKE               IL   EMERGENCY MNGR

&&

MTF