Tuesday, August 24, 2021

Hazardous Weather Outlook for McHenry Co., IL

<pre>FLUS43 KLOT 241736
HWOLOT

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
1236 PM CDT Tue Aug 24 2021


Winnebago-Boone-McHenry-Lake IL-Ogle-Lee-De Kalb-Kane-DuPage-
La Salle-Kendall-Grundy-Kankakee-Livingston-Iroquois-Ford-
Northern Cook-Central Cook-Southern Cook-Northern Will-
Southern Will-Eastern Will-Lake IN-Porter-Newton-Jasper-Benton-
1236 PM CDT Tue Aug 24 2021 /136 PM EDT Tue Aug 24 2021/

This Hazardous Weather Outlook is for portions of North Central
Illinois...Northeast Illinois and Northwest Indiana.

.DAY ONE...This Afternoon and Tonight.

Weather hazards expected...

Limited Thunderstorm Risk...with an associated:
Limited damaging wind risk...up to 60 mph.
Limited hail risk...up to quarter size.
Limited Flooding Risk.
Elevated Excessive Heat Risk.

DISCUSSION...

Thunderstorms stretching from northern Iowa to central Wisconsin
as of mid day may move into areas mainly north of I-88 toward and
after sunset this evening. The main threat would be wind gusts
strong enough to down tree limbs if these storms do affect the
area and remain strong to severe. Additional thunderstorms are
possible in the late evening and overnight. Any thunderstorm
through tonight will produce torrential downpours capable of
producing ponding on roadways and possibly localized flooding.

Hot and humid conditions with heat index values of 100 to 110
degrees will continue through the afternoon.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

Wednesday...
Limited Thunderstorm Risk.
Elevated Excessive Heat Risk.
Thursday through Sunday...
Limited Thunderstorm Risk.
Limited Excessive Heat Risk.
Monday...
Limited Thunderstorm Risk.

DISCUSSION:

Hot and humid conditions are expected through at least Wednesday
with heat indices over 100 possible. Periodic thunderstorms will
occur as well, though many hours will stay dry.

.SPOTTER INFORMATION STATEMENT...

Spotters may be needed in the evening, mainly north of I-80.

GENERAL STORM MOTION OF THE DAY:

Moving toward east and east-southeast at 30 to 35 mph.
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