Monday, May 15, 2017

Hazardous Weather Outlook for McHenry Co., IL

FLUS43 KLOT 151716
HWOLOT

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
1216 PM CDT Mon May 15 2017


Winnebago-Boone-McHenry-Lake Illinois-Ogle-Lee-De Kalb-Kane-
DuPage-Cook-La Salle-Kendall-Grundy-Will-Kankakee-Livingston-
Iroquois-Ford-Lake Indiana-Porter-Newton-Jasper-Benton-
1216 PM CDT Mon May 15 2017 /116 PM EDT Mon May 15 2017/

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL ILLINOIS...
NORTHEAST ILLINOIS AND NORTHWEST INDIANA.

.DAY ONE...This Afternoon and Tonight.

WEATHER HAZARDS EXPECTED:
Elevated Thunderstorm Risk...with an associated:
Limited Tornado Risk.
Elevated Hail Risk...up to quarter size.
Significant Thunderstorm Wind Damage Risk...up to 60 MPH.

DISCUSSION:

Thunderstorms in the form of clusters or at least a loosely
organized complex are possible mainly north of I-88 late
this afternoon into the evening. Confidence is low in the
evolution of these thunderstorms, but the amount of atmospheric
instability and wind shear expected to be available presents at
least some severe risk, especially across far northern Illinois.
The main severe threats, if severe thunderstorms occur, are
anticipated to be hail and damaging wind gusts.

The prime period for concern would be in the 7 to 10 pm time frame
across north Central Illinois, and 830 pm to 11 pm time across
the Chicago metro area, should the organized complex of storms
move through the area. It is possible the storms remain north or
weaken during this time.

In addition...minor flooding will continue along portions of the
Illinois and Kankakee Rivers.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

Wednesday...
Limited Thunderstorm Risk.
Limited Non Thunderstorm Wind Risk.
Thursday...
Limited Thunderstorm Risk.
Friday and Saturday...
Limited Thunderstorm Risk.

DISCUSSION:

An unseasonably strong storm system will affect the Midwest on
Wednesday. Thunderstorms are possible, with a conditional risk
for severe thunderstorms. In addition, very strong southerly wind
gusts up to or above 40 mph are possible.

In addition...minor flooding will continue along portions of the
Illinois and Kankakee rivers.

.SPOTTER INFORMATION STATEMENT...

Spotters may be needed this evening.

GENERAL STORM MOTION OF THE DAY:

Toward the southeast or east southeast at around 30 mph.

&&



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