Monday, August 20, 2018

Hazardous Weather Outlook for McHenry Co., IL

<pre>FLUS43 KLOT 200911 HWOLOT

Hazardous Weather Outlook National Weather Service Chicago/Romeoville IL 411 AM CDT Mon Aug 20 2018

Winnebago-Boone-McHenry-Lake IL-Ogle-Lee-DeKalb-Kane-DuPage-Cook- La Salle-Kendall-Grundy-Will-Kankakee-Livingston-Iroquois-Ford- Lake IN-Porter-Newton-Jasper-Benton- 411 AM CDT Mon Aug 20 2018 /511 AM EDT Mon Aug 20 2018/

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

.DAY ONE…Today and Tonight.

Weather hazards expected…

Significant Thunderstorm Risk...with an associated:     Elevated Tornado risk.  Limited Flooding Risk.  High Swim Risk

DISCUSSION…

A wave of showers and thunderstorms, some with heavy downpours, will move across the outlook area this morning into the early to mid afternoon.

Behind this activity, additional isolated to scattered thunderstorms are forecast to develop this afternoon from northwest Illinois arcing southeast to portions of east central Illinois. Conditions could become favorable for a couple of these storms to potentially become tornadic from late this afternoon until around sunset. The greatest risk of severe weather is south and west of a line from Dixon to Joliet to Fowler Indiana.

.DAYS TWO THROUGH SEVEN…Tuesday through Sunday.

Tuesday…

Limited Thunderstorm Risk.  Elevated Lakeshore Flood Risk  High Swim Risk

Wednesday…

High Swim Risk

Friday…

Elevated Thunderstorm Risk.

Saturday…

Limited Thunderstorm Risk.

Sunday…

Limited Thunderstorm Risk.  Limited Excessive Heat Risk.

.SPOTTER INFORMATION STATEMENT…

Spotters may be needed between 2 pm and 9 pm.

GENERAL STORM MOTION OF THE DAY:

Moving toward the north or northeast at 25 mph.

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