Sunday, May 17, 2020

Hazardous Weather Outlook for McHenry Co., IL

<pre>FLUS43 KLOT 172035 CCA
HWOLOT

Hazardous Weather Outlook...CORRECTED
National Weather Service Chicago/Romeoville IL
335 PM CDT Sun May 17 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-
335 PM CDT Sun May 17 2020 /435 PM EDT Sun May 17 2020/

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

.DAY ONE...Tonight.

Weather hazards expected...

Significant Flooding Risk.
Significant Thunderstorm Risk...with an associated:
Elevated Tornado risk mainly south of I-80.
Limited damaging wind risk...up to 60 mph.
Elevated Fog Risk.
Elevated Lakeshore Flood Risk Illinois shore.

DISCUSSION...

Showers and storms will increase and coverage and intensity
through this afternoon. The ground is saturated and anticipated
swaths of heavy rainfall are therefore expected to result in flash
flooding, some potentially significant, along with renewed river
rises. A threat for severe storms exists this afternoon and
evening, with a potential for damaging wind gusts and and even a
few tornadoes, mainly south of I-80 and east of I-39.

Some dense fog will be possible tonight. In addition, increasing
surge and waves will result in a threat for minor lakeshore
flooding across the Illinois shore.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Monday and Tuesday...
Elevated Fog Risk.
Elevated Lakeshore Flood Risk.
Thursday through Saturday...
Limited Thunderstorm Risk.

DISCUSSION:

Near record water levels combined with gusty northeast winds,
increased wave action, and developing surge may lead to areas of
lakeshore flooding Monday into Tuesday.

.SPOTTER INFORMATION STATEMENT...

Spotters may be needed this afternoon and evening.

GENERAL STORM MOTION OF THE DAY:

Individual storms moving toward the northeast at 30 to 35 mph,
with the line of storms motion generally toward the east at
10 to 15 mph.
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