FLUS43 KLOT 201819
HWOLOT
Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
119 PM 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-
119 PM CDT Thu Jul 20 2017 /219 PM EDT Thu Jul 20 2017/
THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL ILLINOIS...
NORTHEAST ILLINOIS AND NORTHWEST INDIANA.
.DAY ONE...This Afternoon and Tonight.
WEATHER HAZARDS EXPECTED:
Limited Thunderstorm Risk...with an associated:
Limited Hail Risk...up to quarter size.
Elevated Thunderstorm Wind Damage Risk...up to 60 MPH.
Limited Flooding Risk.
Elevated Excessive Heat Risk.
DISCUSSION:
Scattered thunderstorm development is possible south of a
Rochelle, IL to Rensselaer, IN line through this evening. The main
threat from all storms will be torrential rainfall. However, only
the strongest storms will be capable of producing large hail and
damaging winds.
Heat indices will be around or just over 100 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 through this evening.
GENERAL STORM MOTION OF THE DAY:
Moving toward the southeast at 35 to 40 MPH.
&&
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