Wednesday, July 28, 2021

Hazardous Weather Outlook for McHenry Co., IL

<pre>FLUS43 KLOT 280858
HWOLOT

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
358 AM 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-
358 AM CDT Wed Jul 28 2021 /458 AM EDT Wed Jul 28 2021/

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

.DAY ONE...Today 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...

Scattered thunderstorms will be seen this morning with the
possibility of a few thunderstorms this afternoon and early
evening. A few of these could be marginally severe and produce
locally heavy rainfall.

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.

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 Excessive Heat Risk south of I-80.
Limited Severe Thunderstorm Risk south of I-80.
High Swim Risk.
Friday...
High Swim Risk.
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 if not the entire day Thursday.

.SPOTTER INFORMATION STATEMENT...

Spotter reports with any stronger thunderstorms today are
appreciated, and any reports of wind damage from late
tonight.

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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