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Hazardous Weather Outlook

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
434 AM CDT Wed Jul 26 2017

ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
270945-
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-
434 AM CDT Wed Jul 26 2017 /534 AM EDT Wed Jul 26 2017/

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

.DAY ONE...Today and Tonight.

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

Flooding continues along many area rivers.

DISCUSSION:

Thunderstorms will develop from west to east across the outlook
area from late this afternoon into this evening, and continue
tonight. A very moist air mass will support the potential for
locally heavy rainfall with these storms, especially if multiple
storms train over the same location. It appears that the greatest
threat of widespread heavy rainfall will be generally south of a
line from Dixon to Joliet to Rensselaer Indiana. In addition,
strong to severe thunderstorms are possible especially this
evening, with damaging winds and large hail the primary threats.
The severe threat should diminish later in the night.

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

Thursday...
  Limited Flooding Risk.
  Limited Severe Thunderstorm Risk.
  High Swim Risk.
Monday and Tuesday...
  Limited Thunderstorm Risk.

Flooding will continue on many area rivers and new rises are
possible if heavy rain occurs tonight.

.SPOTTER INFORMATION STATEMENT...

Spotters may be needed late today and this evening.

GENERAL STORM MOTION OF THE DAY:

moving east at 25 MPH...

&&

$$



Hydrologic Outlook

Hydrologic Outlook
ILC053-063-075-091-093-099-103-105-197-INC007-073-111-262130-

Hydrologic Outlook
National Weather Service Chicago IL
410 AM CDT Wed Jul 26 2017 /510 AM EDT Wed Jul 26 2017/

...LOCALLY HEAVY RAINFALL POSSIBLE TONIGHT INTO EARLY THURSDAY...

Thunderstorms are expected to develop across the area by this
evening, with the return of a very humid air mass which will
support the potential for heavy rainfall. While some uncertainty
still exists as to the exact location where the heaviest rains
will occur, areas south of a Dixon to Joliet to Rensselaer line
appear to have the greatest potential to see higher rainfall
amounts, potentially of 1 to 3 inches.

Given wet ground conditions from recent heavy rains, any
locations that receive additional heavy rainfall tonight into
early Thursday will likely be more susceptible to flooding than
normal. In addition, this would likely cause additional rises on
portions of the Illinois and Kankakee Rivers, where rises have
already occurred from recent rains.

Those with hydrologic concerns in these areas should maintain a
close watch on actual rainfall amounts and river stage forecasts.
Be sure to monitor later forecasts for updates on the heavy rain
and flooding potential tonight into early Thursday.

$$

Ratzer




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