Wednesday, July 28, 2021

Hazardous Weather Outlook for McHenry Co., IL

<pre>FLUS43 KLOT 281816
HWOLOT

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
116 PM CDT Wed Jul 28 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-
116 PM CDT Wed Jul 28 2021 /216 PM EDT Wed Jul 28 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 Excessive Heat Risk.
Significant Thunderstorm Risk...with an associated:
Elevated Damaging Wind Risk...up to 75 mph.
Limited Tornado Risk.
Limited Hail Risk...up to half dollar size.
Limited Flooding Risk.

DISCUSSION...

Very humid air will spread over the region today, resulting
in heat index readings at or just above 100 degrees in parts
of north central and east central Illinois through late afternoon.

There is a chance for a few isolated thunderstorms in the mid to
late afternoon. If any stronger thunderstorm were to form, it
would pose a threat for localized damaging wind gusts and hail.

Organized, severe thunderstorms will develop in Wisconsin this
evening and track southeast. These are likely to at least clip
northeast Illinois and far northwest Indiana between 11 pm and
4 am, but may also move directly into the outlook area during
that time. Damaging winds would be most favored threat with
these storms depending on their track, as well as period of very
heavy rainfall that could cause localized flooding.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Thursday...
Limited Severe Thunderstorm Risk.
Limited Flooding Risk.
Elevated Excessive Heat Risk.
High Swim Risk at Lake Michigan beches.
Friday...
High Swim Risk at Lake Michigan beaches.
Saturday...
Limited Thunderstorm Risk.

DISCUSSION:

Scattered thunderstorms may continue into Thursday morning,
likely shifting south of I-80 by afternoon. A few of these
storms could be severe.

High waves from the gusty storms overnight may continue into
Thursday morning, with waves then building in the afternoon behind
a cold front. This will create dangerous swimming conditions for
at least part of if not the entire day Thursday and into or through
Friday.

.SPOTTER INFORMATION STATEMENT...

Spotter reports of wind damage from late tonight are appreciated.

GENERAL STORM MOTION OF THE DAY:

Moving toward the east southeast at 35 mph today, and toward
the southeast at 45 to 60 mph tonight.
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