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Hazardous Weather Outlook

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
1249 PM CDT Fri Jul 21 2017

ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
221800-
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-
1249 PM CDT Fri Jul 21 2017 /149 PM EDT Fri Jul 21 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:
      Significant Thunderstorm Wind Damage Risk...up to 70 mph.
      Elevated Hail Risk...up to quarter size.
      Limited Tornado Risk.
  Significant Flooding Risk.
  Significant Excessive Heat Risk this afternoon.

DISCUSSION:

Thunderstorm potential will increase late this afternoon through
early Saturday morning, with the potential to produce torrential rainfall
and flash flooding. Strong to severe storms will be most likely
from late this afternoon through this evening, with damaging winds
the primary severe weather threat, in addition to very heavy rainfall.
Behind the initial line of storms, additional heavy rain producing
thunderstorms will likely develop for some areas.
Heaviest rainfall amounts, in excess of 1.5 inches or more, are expected to
occur primarily over far northern Illinois north of Interstate 80.

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

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Saturday...
  Limited Flooding Risk.
  Elevated Severe Thunderstorm Risk.
  Elevated Excessive Heat Risk.
Sunday...
  Limited Severe Thunderstorm Risk.
Thursday...
  Limited Thunderstorm Risk.

In addition, flooding will continue along portions of the Fox and
Des Plaines Rivers.

.SPOTTER INFORMATION STATEMENT...

Spotters will likely be needed beginning this evening.

GENERAL STORM MOTION OF THE DAY:

Toward the east-southeast at 35 to 40 mph.

&&

$$



Flash Flood Watch

Flood Watch
National Weather Service Chicago/Romeoville IL
1129 AM CDT Fri Jul 21 2017

ILZ003>006-008-010>014-019>022-220030-
/O.CON.KLOT.FF.A.0004.170721T2100Z-170722T1400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Winnebago-Boone-McHenry-Lake IL-Ogle-Lee-De Kalb-Kane-DuPage-Cook-
La Salle-Kendall-Grundy-Will-
Including the cities of Rockford, Belvidere, Woodstock, Waukegan,
Oregon, Dixon, Dekalb, Aurora, Elgin, Wheaton, Chicago, Ottawa,
Oswego, Morris, and Joliet
1129 AM CDT Fri Jul 21 2017

...FLASH FLOOD WATCH REMAINS IN EFFECT FROM 4 PM CDT THIS
AFTERNOON THROUGH SATURDAY MORNING...

The Flash Flood Watch continues for

* Portions of north central Illinois and northeast Illinois,
  including the following areas, in north central Illinois,
  Boone, De Kalb, La Salle, Lee, Ogle, and Winnebago. In
  northeast Illinois, Cook, DuPage, Grundy, Kane, Kendall, Lake
  IL, McHenry, and Will.

* From 4 PM CDT this afternoon through Saturday morning.

* Multiple rounds of thunderstorms producing heavy rainfall with
  rates well over one inch per hour are likely to move across
  portions of north central and northeast Illinois late this
  afternoon through early Saturday morning.

* Additional heavy rainfall could exacerbate flooding already
  occurring across portions of northern Illinois...producing new
  rises on area rivers and creeks. With the ground already
  saturated in many areas...heavy rainfall will likely quickly
  produce runoff and produce flash flooding.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flash Flood Watch means that conditions may develop that lead
to flash flooding. Flash flooding is a very dangerous situation.

You should monitor later forecasts and be prepared to take action
should Flash Flood Warnings be issued.

&&

$$

Rodriguez




Flood Warning

Flood Statement
National Weather Service Chicago/Romeoville IL
832 AM CDT Fri Jul 21 2017

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

  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
  Des Plaines River at Riverside affecting Cook County
  Fox River at Algonquin Tailwater affecting Kane and McHenry
  Counties
  Fox River at Montgomery affecting Kane and Kendall Counties

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

ILC089-093-220331-
/O.CON.KLOT.FL.W.0098.000000T0000Z-000000T0000Z/
/MNGI2.2.ER.170712T2137Z.170722T0000Z.000000T0000Z.UU/
832 AM CDT Fri Jul 21 2017

The Flood Warning continues for
  The Fox River at Montgomery.
* until further notice.
* At  745 AM Friday the stage was 13.9 feet.
* Flood stage is 13.0 feet.
* Minor flooding is occurring and Moderate flooding is forecast.
* Forecast...The river will rise slightly to near 14.0 feet by this
  evening. Additional rises may be possible thereafter.
* Impact...At 13.0 feet...Minor lowland flooding begins near river.

&&

LAT...LON 4194 8827 4169 8826 4154 8860 4163 8860
      4173 8838 4195 8838

$$



Flood Warning

Flood Statement
National Weather Service Chicago/Romeoville IL
832 AM CDT Fri Jul 21 2017

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

  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
  Des Plaines River at Riverside affecting Cook County
  Fox River at Algonquin Tailwater affecting Kane and McHenry
  Counties
  Fox River at Montgomery affecting Kane and Kendall Counties

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

ILC089-111-220332-
/O.CON.KLOT.FL.W.0101.000000T0000Z-000000T0000Z/
/AFBI2.3.ER.170712T1522Z.170720T1715Z.000000T0000Z.UU/
832 AM CDT Fri Jul 21 2017

The Flood Warning continues for
  The Fox River at Algonquin Tailwater.
* until further notice.
* At  730 AM Friday the stage was 12.6 feet.
* Flood stage is 9.5 feet.
* Recent activity...Flood forecasts for Algonquin were moved to this
  location on July 5 2011. Gage zero datum is different from the old
  gage location. Flood and action stages have changed.
* Major flooding is occurring and Major flooding is forecast.
* Forecast...The river will continue rising to near 12.8 feet by
  Saturday afternoon. Additional rises may be possible thereafter.


&&

LAT...LON 4238 8830 4237 8817 4221 8814 4194 8827
      4195 8838 4224 8828

$$



U.S. Dept. of Commerce
NOAA National Weather Service
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Silver Spring, MD 20910
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Page last modified: May 16, 2007
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