<pre>FLUS43 KLOT 082037
HWOLOT
Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
337 PM CDT Sun Aug 8 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-
337 PM CDT Sun Aug 8 2021 /437 PM EDT Sun Aug 8 2021/
This Hazardous Weather Outlook is for portions of North Central
Illinois...Northeast Illinois and Northwest Indiana.
.DAY ONE...Tonight.
Weather hazards expected...
Elevated Thunderstorm Risk...with an associated:
Limited hail risk...up to quarter size.
Limited damaging wind risk...up to 60 mph.
Limited Flooding Risk.
Limited Excessive Heat Risk.
Limited Non Thunderstorm Wind Risk.
DISCUSSION...
Widely scattered thunderstorms along a line from Crystal Lake
to Pontiac will likely bring wind gusts to 45 or 50 mph this
afternoon. Winds area wide will gust to 35 mph for those
having outdoor events. These will reach the lakefront around 5-530
PM CDT.
The main window for more widespread thunderstorms, and some potential
severe thunderstorms will early to mid evening, most
favored across the Interstate 39 corridor west of the Chicago
metro area. These storms near will move from the southwest
where ongoing strong to severe storms are ongoing across Missouri.
Any organized storm clusters which develop will have the
potential to produce localized damaging winds and isolated large hail.
Thunderstorms across the Chicago area will be favored in the
early to mid evening.
Clusters of heavy showers and embedded thunderstorms may occur
overnight, and some of these may present an isolated flooding
risk overnight. This risk is higher south of Interstate 80.
.DAYS TWO THROUGH SEVEN...Monday through Saturday.
Monday...
Limited Severe Thunderstorm Risk.
Limited Flooding Risk.
Tuesday...
Limited Severe Thunderstorm Risk.
Limited Flooding Risk.
Elevated Excessive Heat Risk.
Wednesday and Thursday...
Limited Thunderstorm Risk.
Limited Excessive Heat Risk.
Friday...
Limited Thunderstorm Risk.
DISCUSSION:
A warm, humid and unsettled weather pattern will remain in
place across the area through much of the week. Periodic
thunderstorms are expected. Monday afternoon and evening there
is an increasing concern for severe thunderstorms across
northeast Illinois. The threat will switch to a period of
pose a locally heavy rainfall and a flooding threat in the
later evening and overnight. Another round of strong to severe
storms is possible late Tuesday or Tuesday night.
Warm and very humid conditions will persist through mid-week.
Heat indices of over 100 are expected in most areas during the
afternoon hours, with dangerous heat index values higher than 105
appearing more likely for areas southwest of the Chicago metro area.
.SPOTTER INFORMATION STATEMENT...
Spotters may be needed this afternoon and evening.
GENERAL STORM MOTION OF THE DAY:
Moving toward the northeast at 20 to 25 mph.
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