FLUS43 KLOT 200839
HWOLOT
Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
339 AM CDT Thu Jul 20 2017
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-
339 AM CDT Thu Jul 20 2017 /439 AM EDT Thu Jul 20 2017/
THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL ILLINOIS...
NORTHEAST ILLINOIS AND NORTHWEST INDIANA.
.DAY ONE...Today and Tonight.
WEATHER HAZARDS EXPECTED:
Significant Thunderstorm Risk...with an associated:
Elevated Flooding Risk.
Limited Hail Risk...up to half dollar size.
Limited Thunderstorm Wind Damage Risk...up to 60 MPH.
Elevated Excessive Heat Risk.
DISCUSSION:
Thunderstorms will move slowly southeast over northern Illinois
and possibly northwest Indiana through mid-morning. These will
produce periods of very heavy rainfall which could cause flooding.
Also, they will bring isolated winds in excess of 40 mph.
Isolated storms are possible this afternoon into tonight along
the outflow boundary from the morning storms. While coverage of
storms is likely to be limited, if they can develop they will have
heavy rain and a possible flooding threat, as well as some chance
to be severe.
If rain cooled air and clouds have a limited effect, locations
south of Interstate 80 will have heat index readings approach 105
degrees this afternoon.
Flooding will continue along portions of the Fox and Des Plaines
Rivers.
.DAYS TWO THROUGH SEVEN...Friday through Wednesday.
Friday...
Significant Flooding Risk.
Elevated Severe Thunderstorm Risk.
Elevated Excessive Heat Risk.
Saturday...
Limited Flooding Risk.
Elevated Severe Thunderstorm Risk.
Elevated Excessive Heat Risk.
Sunday...
Limited Thunderstorm Risk.
Wednesday...
Limited Thunderstorm Risk.
DISCUSSION:
An active and humid weather pattern will continue through Saturday.
Thunderstorms are likely at times Friday and more so Friday night,
especially north of Interstate 80. The potential for heavy rain in
the region is significant which could cause worsened flooding.
However, the exact location of the heaviest rainfall is uncertain.
In addition there is a severe thunderstorm threat, mainly north of
Interstate 80, on Friday and Friday night as well.
Thunderstorm chances continue on Saturday, shifting mainly along and
south of Interstate 80 by Saturday night.
Heat index readings will approach 105 degrees both Friday and
Saturday, mainly along and south of Interstate 80.
In addition, flooding will continue along portions of the Fox and
Des Plaines Rivers and may develop along other rivers of far
northern Illinois.
.SPOTTER INFORMATION STATEMENT...
Spotters may be needed this afternoon and evening.
GENERAL STORM MOTION OF THE DAY:
Moving to the southeast at 25 mph.
&&
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