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Hazardous Weather Outlook

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
343 PM CDT Tue Jul 25 2017

ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
262045-
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-
343 PM CDT Tue Jul 25 2017 /443 PM EDT Tue Jul 25 2017/

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

.DAY ONE...Tonight.

Flooding continues along many area rivers.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

Wednesday...
  Elevated Flooding Risk.
  Elevated Severe Thunderstorm Risk.
Thursday...
  Elevated Flooding Risk.
  Limited Severe Thunderstorm Risk.
  High Swim Risk.
Monday...
  Limited Thunderstorm Risk.

DISCUSSION:

Thunderstorms are expected to develop across the area as early as
Wednesday evening and continue into Thursday as a cold front
moves across the area. Some storms could be strong to severe with
large hail and damaging wind gusts Wednesday night, with a more
isolated severe storm potential mainly east of I-55 across eastern
Illinois and northwest Indiana Thursday. The potential for heavy
rainfall exists especially Wednesday night, particularly over the
southern half of the outlook area.

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

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be necessary through tonight.

&&

$$



Hydrologic Outlook

Hydrologic Outlook
ILC031-037-043-053-063-075-089-091-093-099-103-105-141-197-INC007-
073-089-111-127-260830-

Hydrologic Outlook
National Weather Service Chicago IL
322 PM CDT Tue Jul 25 2017 /422 PM EDT Tue Jul 25 2017/

...POTENTIAL FOR HEAVY RAINFALL WEDNESDAY NIGHT INTO EARLY
THURSDAY...

Thunderstorms are expected to return to the area by Wednesday
evening, with the return of a very humid air mass which will
support the potential for heavy rainfall. There remains
uncertainty as to where the heaviest rainfall will occur, though
there is some signal that locations south of a Dixon, to Joliet,
to Valparaiso line may be most favored for higher rainfall
amounts, potentially of 1 to 3 inches.

Given the wet antecedent conditions from recent heavy rainfall,
areas that receive additional heavy rainfall Wednesday night and
early Thursday will likely be more susceptible to flooding than
normal. This would likely cause additional rises on portions of
the Kankakee and Illinois Rivers, where rises have already
occurred due to 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 Wednesday night into early Thursday.

$$

Rodriguez




Flood Warning

Flood Statement
National Weather Service Chicago/Romeoville IL
819 AM CDT Tue Jul 25 2017

...The Flood Warning continues for the following rivers in
Illinois...Indiana...

  Des Plaines River near Gurnee affecting Lake County
  Des Plaines River at Lincolnshire affecting Lake County
  Des Plaines River near Des Plaines affecting Cook County
  Kankakee River at Shelby affecting Lake and Newton Counties
...The Flood Warning continues for the following rivers in
Illinois...
  Fox River at Algonquin Tailwater affecting Kane and McHenry
  Counties
  Fox River at Montgomery affecting Kane and Kendall Counties
  Fox River at Dayton affecting La Salle County

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Safety message...If you encounter a flooded roadway...turn around and
find an alternate route.

&&

ILC031-260318-
/O.EXT.KLOT.FL.W.0097.000000T0000Z-170726T1800Z/
/DSPI2.2.ER.170712T1631Z.170723T0045Z.170726T1200Z.NO/
819 AM CDT Tue Jul 25 2017

The Flood Warning continues for
  The Des Plaines River near Des Plaines.
* until Wednesday afternoon.
* At  745 AM Tuesday the stage was 16.1 feet.
* Flood stage is 15.0 feet.
* Recent activity...Gage datum was changed by 10 feet on Nov 14 2014.
  Flood thresholds and flood impacts are now 10 feet higher than
  previous values.
* Minor flooding is occurring and Minor flooding is forecast.
* Forecast...The river will continue to fall to below flood stage by
  Wednesday morning.
* Impact...At 15.5 feet...Water reaches some backyards along Big Bend
  Drive.

&&

LAT...LON 4212 8784 4196 8780 4196 8790 4212 8794


$$



U.S. Dept. of Commerce
NOAA National Weather Service
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Silver Spring, MD 20910
E-mail: w-nws.webmaster@noaa.gov
Page last modified: May 16, 2007
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