Tuesday, July 21, 2020

Hazardous Weather Outlook for McHenry Co., IL

<pre>FLUS43 KLOT 211657
HWOLOT

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
1157 AM CDT Tue Jul 21 2020


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-
1157 AM CDT Tue Jul 21 2020 /1257 PM EDT Tue Jul 21 2020/

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...

Elevated Thunderstorm Risk...with an associated:
Limited hail risk...up to one inch diameter.
Limited damaging wind risk...up to 60 mph.
Limited Flooding Risk.

DISCUSSION...

The first round of storms moving through mainly southern portions
of the area during the early afternoon is expected to be followed
by another round later in the day. Damaging winds are the primary
concern with these storms, though some isolated hail to the size
of quarters is possible. Very heavy rainfall will also accompany
these storms, and this may result in some localized areas of flash
flooding, especially in areas that experience multiple storms.

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

Wednesday and Thursday...
Limited Thunderstorm Risk.
Friday and Saturday...
Limited Thunderstorm Risk.
Limited Excessive Heat Risk.
Sunday and Monday...
Limited Thunderstorm Risk.
Elevated Excessive Heat Risk.

DISCUSSION:

Periodic small chances of thunderstorms will continue Wednesday
and Thursday, mainly south of I-80. Low chances for spotty storms
continue Friday and through the weekend, though most will remain
dry. A better chance for storms returns Sunday night and Monday.

Hot and increasingly humid conditions are likely to return to the
area for the weekend. Heat indices may exceed 100 degrees,
especially on Sunday.

.SPOTTER INFORMATION STATEMENT...

Spotters may be needed this afternoon and evening, especially
toward southern portions of the outlook area south of I-80.

GENERAL STORM MOTION OF THE DAY:

Moving toward the east at 35 to 40 mph.
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