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Flood Advisory

Flood Advisory
National Weather Service Chicago/Romeoville Il
714 AM CDT THU JUL 20 2017

ILC031-043-089-093-097-197-INC089-201415-
/O.NEW.KLOT.FA.Y.0026.170720T1214Z-170720T1415Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Kendall IL-Lake IL-Will IL-Kane IL-DuPage IL-Cook IL-Lake IN-
714 AM CDT THU JUL 20 2017

The National Weather Service in Chicago has issued a

* Flood Advisory for Minor Flooding in Poor Drainage Areas for...
  Kendall County in northeastern Illinois...
  Southern Lake County in northeastern Illinois...
  Northern Will County in northeastern Illinois...
  Southeastern Kane County in northeastern Illinois...
  DuPage County in northeastern Illinois...
  Cook County in northeastern Illinois...
  Northwestern Lake County in northwestern Indiana...

* Until 915 AM CDT

* At 712 AM CDT, Doppler radar indicated heavy rain due to
  thunderstorms. While the storms will have move quickly through,
  earlier storms from last night and early this morning have
  saturated the ground.  This will cause minor flooding.

* Some locations that will experience flooding include...
  Chicago and many of its suburbs.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don`t drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, urban areas, highways, streets and underpasses as
well as other drainage areas and low lying spots.

&&

LAT...LON 4233 8783 4227 8783 4213 8774 4206 8767
      4190 8761 4190 8760 4188 8762 4183 8760
      4169 8750 4147 8750 4146 8860 4183 8860
      4216 8822 4216 8820 4217 8820 4240 8781

$$

MTF




Hydrologic Outlook

Hydrologic Outlook
ILC007-031-037-043-089-097-103-111-141-201-202100-

Hydrologic Outlook
National Weather Service Chicago IL
346 AM CDT Thu Jul 20 2017

Heavy rain producing thunderstorms will end by mid to late
morning over northern Illinois, but isolated storms are possible
again this afternoon and tonight. More widespread storms are
forecast Friday and especially Friday night. These storms will
likely be efficient rainfall producers. While there remains
modest uncertainty in placement of storms within the region from
Friday and Friday night, there is increasing signal that along and
north of Interstate 88 in northern Illinois and into Wisconsin
may be the most favored. Again on Saturday, there is a chance for
thunderstorms as well before drier air moves into the region.
Given wet antecedent conditions over the Des Plaines, Fox,
Kishwaukee, and north branch of the Chicago River basins, this
portion of northern Illinois is susceptible to additional flooding
if multiple rounds of heavy rainfall pan out.

Those with hydrologic concerns in the area should maintain a
close watch on the rainfall and river stage forecasts which will
become gradually more refined with time.

$$




Hazardous Weather Outlook

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
339 AM CDT Thu Jul 20 2017

ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
210845-
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-
339 AM CDT Thu Jul 20 2017 /439 AM EDT Thu Jul 20 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:
      Elevated Flooding Risk.
      Limited Hail Risk...up to half dollar size.
      Limited Thunderstorm Wind Damage Risk...up to 60 MPH.
  Elevated Excessive Heat Risk.

DISCUSSION:

Thunderstorms will move slowly southeast over northern Illinois
and possibly northwest Indiana through mid-morning. These will
produce periods of very heavy rainfall which could cause flooding.
Also, they will bring isolated winds in excess of 40 mph.

Isolated storms are possible this afternoon into tonight along
the outflow boundary from the morning storms. While coverage of
storms is likely to be limited, if they can develop they will have
heavy rain and a possible flooding threat, as well as some chance
to be severe.

If rain cooled air and clouds have a limited effect, locations
south of Interstate 80 will have heat index readings approach 105
degrees this afternoon.

Flooding will continue along portions of the Fox and Des Plaines
Rivers.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Friday...
  Significant Flooding Risk.
  Elevated Severe Thunderstorm Risk.
  Elevated Excessive Heat Risk.
Saturday...
  Limited Flooding Risk.
  Elevated Severe Thunderstorm Risk.
  Elevated Excessive Heat Risk.
Sunday...
  Limited Thunderstorm Risk.
Wednesday...
  Limited Thunderstorm Risk.

DISCUSSION:

An active and humid weather pattern will continue through Saturday.
Thunderstorms are likely at times Friday and more so Friday night,
especially north of Interstate 80. The potential for heavy rain in
the region is significant which could cause worsened flooding.
However, the exact location of the heaviest rainfall is uncertain.
In addition there is a severe thunderstorm threat, mainly north of
Interstate 80, on Friday and Friday night as well.

Thunderstorm chances continue on Saturday, shifting mainly along and
south of Interstate 80 by Saturday night.

Heat index readings will approach 105 degrees both Friday and
Saturday, mainly along and south of Interstate 80.

In addition, flooding will continue along portions of the Fox and
Des Plaines Rivers and may develop along other rivers of far
northern Illinois.

.SPOTTER INFORMATION STATEMENT...

Spotters may be needed this afternoon and evening.

GENERAL STORM MOTION OF THE DAY:

Moving to the southeast at 25 mph.

&&

$$



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