FLUS43 KLOT 202159
HWOLOT
Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
459 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-
459 PM CDT Thu Jul 20 2017 /559 PM EDT Thu Jul 20 2017/
THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL ILLINOIS...
NORTHEAST ILLINOIS AND NORTHWEST INDIANA.
.DAY ONE...Tonight.
WEATHER HAZARDS EXPECTED:
Limited Thunderstorm Risk...with an associated:
Limited Hail Risk...up to quarter size.
Limited Thunderstorm Wind Damage Risk...up to 60 MPH.
Limited Flooding Risk.
Elevated Excessive Heat Risk through this evening.
Elevated Fog Risk.
DISCUSSION:
Scattered thunderstorm development is possible along and south of a
Rochelle, IL to Rensselaer, IN line late this evening through the
overnight hours. The main threat from all storms will be
torrential rainfall. However, the strongest storms will be
capable of producing large hail and damaging winds.
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.
Limited Fog 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 evening into Saturday morning, 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 late this evening.
GENERAL STORM MOTION OF THE DAY:
Moving toward the southeast at 35 to 40 MPH.
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