Heavy Thunderstorms Underway with FLASH FLOOD WATCH and FLOOD ADVISORY In Effect

Weather radar [LIVE RADAR] shows the heaviest rain and thunderstorm activity along a line at the latitude of Lake Cook Road. Buffalo Grove and Wheeling have some flooding with Wheeling Road blocked between Dundee Road and Hintz Road. Some flooding was also reported near the police station on Dundee Road. Other areas of flooding are also expected. Wheeling police have helped a few drivers who have become stranded in deep water.

Peak thunderstorm activity occurred in Arlington Heights at about 4:55 a.m. Severe lightning has accompanied heavy rain.

Radar looks as though storms might be setting up for training along the Lake-Cook line. Storms continued to build with backgrowth toward western Kane County and storms moving toward the east. Another large area of storms already developed are heading toward Rockford. The backfill could meet up with the second group of storms and bring continuous rain for the next couple of hours.

FLOOD ADVISORY
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
433 AM CDT WED JUN 26 2013

MCHENRY IL-LAKE IL-COOK IL-
433 AM CDT WED JUN 26 2013

THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED AN

* URBAN AND SMALL STREAM FLOOD ADVISORY FOR…
NORTHWESTERN COOK COUNTY IN NORTHEAST ILLINOIS…
SOUTHEASTERN MCHENRY COUNTY IN NORTHEAST ILLINOIS…
SOUTHERN LAKE COUNTY IN NORTHEAST ILLINOIS…

* UNTIL 1030 AM CDT

* AT 432 AM CDT…NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THUNDERSTORMS WITH HEAVY RAINFALL ACROSS THE ADVISORY AREA. DOPPLER
RADAR ESTIMATED 1.5 TO 3 INCHES OF RAINFALL HAS FALLEN WITH
ADDITIONAL THUNDERSTORMS MOVING OVER THE AREA.

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE MINOR FLOODING TO
OCCUR…ESPECIALLY ALONG SMALL STREAMS AND NEAR LOW WATER
CROSSINGS. SOME LOCATIONS THAT WILL EXPERIENCE MINOR FLOODING
INCLUDE…ALGONQUIN…ARLINGTON HEIGHTS…BARRINGTON…BUFFALO
GROVE…DEERFIELD…GLENCOE…GLENVIEW…HIGHLAND PARK…ISLAND
LAKE…LAKE FOREST…LAKE ZURICH…LIBERTYVILLE…LINCOLNSHIRE…
LONG GROVE AND MCHENRY.

OTHER LOCATIONS AFFECTED…
GREAT LAKES NAVAL TRAINING CENTER…HARPER COLLEGE…LAKE COUNTY IL
FAIRGROUNDS…LAKE FOREST COLLEGE…MCHENRY COUNTY COLLEGE…MORRAIN
HILLS STATE PARK…

PRECAUTIONARY/PREPAREDNESS ACTIONS…

EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE ELEVATED LEVELS ON SMALL
CREEKS AND STREAMS…PONDING OF WATER ON ROADS…URBAN AREAS…
HIGHWAYS… VIADUCTS…UNDERPASSES AND LOW LYING AREAS.

FLOOD WATCH
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
1246 AM CDT WED JUN 26 2013

…MORE HEAVY RAINFALL POSSIBLE TONIGHT THROUGH WEDNESDAY…

WINNEBAGO-BOONE-MCHENRY-LAKE IL-OGLE-LEE-DE KALB-KANE-DUPAGE-COOK-
LA SALLE-KENDALL-GRUNDY-WILL-KANKAKEE-LIVINGSTON-IROQUOIS-FORD-
LAKE IN-PORTER-NEWTON-JASPER-BENTON-
INCLUDING THE CITIES OF…ROCKFORD…BELVIDERE…WOODSTOCK…
WAUKEGAN…OREGON…DIXON…DEKALB…AURORA…WHEATON…CHICAGO…
OTTAWA…OSWEGO…MORRIS…JOLIET…KANKAKEE…PONTIAC…
WATSEKA…PAXTON…GARY…VALPARAISO…MOROCCO…RENSSELAER…
FOWLER
1246 AM CDT WED JUN 26 2013 /146 AM EDT WED JUN 26 2013/

…FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH THIS EVENING…

THE FLASH FLOOD WATCH CONTINUES FOR

* PORTIONS OF ILLINOIS AND INDIANA…INCLUDING THE FOLLOWING
AREAS…IN ILLINOIS…BOONE…COOK…DE KALB…DUPAGE…FORD…
GRUNDY…IROQUOIS…KANE…KANKAKEE…KENDALL…LA SALLE…
LAKE IL…LEE…LIVINGSTON…MCHENRY…OGLE…WILL AND
WINNEBAGO. IN INDIANA…BENTON…JASPER…LAKE IN…NEWTON AND
PORTER.

* OVERNIGHT THROUGH THIS EVENING.

* THUNDERSTORMS WILL REDEVELOP OVER PORTIONS OF IOWA AND NORTHERN
ILLINOIS OVERNIGHT…AND WILL INCREASE IN COVERAGE DURING THE
PRE DAWN HOURS AS THEY SPREAD EAST ACROSS THE AREA. THESE
THUNDERSTORMS WILL BE CAPABLE OF PRODUCING HEAVY RAINFALL RATES
OF 1 TO 2 INCH PER HOUR AND POTENTIAL TRAINING OVER THE SAME
AREA. THIS…ON TOP OF ALREADY SATURATED GROUND FROM RECENT
STORMS COULD PRODUCE FLASH FLOODING.

* RAPID FLOODING OF CREEKS…SMALL STREAMS…ROADS…VIADUCTS…
AND LOW LYING AREAS IS POSSIBLE IN THUNDERSTORMS.

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.


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