Update 12:51AM CDT…

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 515 AM CDT EARLY THIS
MORNING FOR EAST CENTRAL BOONE, NORTHEASTERN DE KALB, NORTHERN COOK,
NORTHERN KANE, SOUTHERN LAKE IL AND SOUTHERN MCHENRY COUNTIES...
..ADDED DUPAGE COUNTY...

At 1251 AM CDT, doppler radar and automated rain gauges indicated
thunderstorms producing rainfall rates of 1 to 2 inches per hour
continuing across the warned area. Between 1 and 3 inches of rain
have fallen, with isolated higher amounts. Some areas may see
additional rainfall of up to 2 inches.

HAZARD...Flash flooding.

SOURCE...Radar and automated gauges.

IMPACT...Rapid-onset flooding of small creeks and streams, urban
         areas, highways, streets and underpasses, as well as
         other poor drainage and low lying areas.

Locations that will experience flash flooding include...
  Elgin, Arlington Heights, Evanston, Schaumburg, Palatine, Skokie,
  Des Plaines, Mount Prospect, Hoffman Estates, Glenview, Buffalo
  Grove, Bartlett, Crystal Lake, Streamwood, Hanover Park,
  Carpentersville, Wheeling, Park Ridge and Northbrook.
__________________________________________________________________
he National Weather Service in Chicago has issued a

* Flash Flood Warning for...
  East Central Boone County in north central Illinois...
  Northeastern De Kalb County in north central Illinois...
  Northern Cook County in northeastern Illinois...
  Northern Kane County in northeastern Illinois...
  Southern Lake IL County in northeastern Illinois...
  Southern McHenry County in northeastern Illinois...

* Until 515 AM CDT.

* At 1215 AM CDT, doppler radar and automated rain gauges indicated
  thunderstorms producing heavy rain across the warned area. Up to 2
  inches of rain have fallen. Storms are producing rain rates of 1
  to 2 inches in 1 hour, with isolated rates near 3 inches per hour.
  Flash flooding is ongoing or expected to begin shortly.

  HAZARD...Flash flooding.

  SOURCE...Radar and automated gauges.

  IMPACT...Rapid-onset flooding of small creeks and streams,
           urban areas, highways, streets and underpasses, as
           well as other poor drainage and low lying areas.

* Some locations that will experience flash flooding include...
  Chicago, Elgin, Arlington Heights, Evanston, Schaumburg, Palatine,
  Skokie, Des Plaines, Mount Prospect, Hoffman Estates, Glenview,
  Buffalo Grove, Bartlett, Crystal Lake, Streamwood, Hanover Park,
  Carpentersville, Wheeling, Park Ridge and Northbrook.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flash Flood Warning means rapid-onset flooding is imminent or may
already be occurring. Persons along creeks, drainage ditches, and
other waterways should take immediate precautions to protect life
and property.

Expect flooding of creeks, ditches, canals, and storm sewers, as
well roadways, underpasses, and other poor drainage areas.