weather.gov     
National Weather Service

Watches, Warnings & Advisories
NWS Homepage

One product issued by NWS for: Amf Ohare IL
Share |


Hazardous Weather Outlook

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
1205 PM CDT Wed Jun 28 2017

ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
291715-
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-
1205 PM CDT Wed Jun 28 2017 /105 PM EDT Wed Jun 28 2017/

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

.DAY ONE...This Afternoon and Tonight.

WEATHER HAZARDS EXPECTED:
  Significant Thunderstorm Risk...with an associated:
      Elevated Tornado Risk.
      Elevated Hail Risk...up to half dollar size.
      Significant Thunderstorm Wind Damage Risk...up to 70 MPH.
  Elevated Flooding Risk.

DISCUSSION:

An area of decaying showers and thunderstorms is moving through
northeastern Illinois and northwestern Indiana this morning.
Low level moisture and instability will increase later this
afternoon and evening from the west however, with renewed storm
development expected from the west. These storms will spread east
into northwest and north central Illinois by this evening, with
severe storms possible. While the potential for severe weather
will extend east across much of the outlook area, the greatest
potential for severe weather will be focused over northwest and
north central Illinois during the evening. Damaging winds and
large hail are the primary threats expected, though supercell
storm structures may pose a tornado threat early in the evening.
Storms will have the potential to produce locally heavy rainfall
amounts, and any training of storms could produce localized
flooding.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Thursday...
  Elevated Flooding Risk.
  Elevated Severe Thunderstorm Risk.
Friday...
  Limited Severe Thunderstorm Risk.
Saturday and Sunday...
  Limited Thunderstorm Risk.
Monday...
  Elevated Thunderstorm Risk.
Tuesday...
  Limited Thunderstorm Risk.

DISCUSSION:

Periods of thunderstorms are expected Friday into Friday night.
Some of these storms could produce severe weather and locally
heavy rainfall. Thunderstorms should become less numerous
Saturday and Sunday, limited mainly to the afternoon and early
evening hours.

.SPOTTER INFORMATION STATEMENT...

Spotters will likely be needed late this afternoon into this
evening across northwest and north central Illinois.

GENERAL STORM MOTION OF THE DAY:

Moving east at 35 MPH...

&&

$$



U.S. Dept. of Commerce
NOAA National Weather Service
1325 East West Highway
Silver Spring, MD 20910
E-mail: w-nws.webmaster@noaa.gov
Page last modified: May 16, 2007
NATIONAL WEATHER SERVICE: for Safety, for Work, for Fun - FOR LIFE