THUNDERSTORMS ARE LIKELY TUESDAY THROUGH WEDNESDAY NIGHT FOR ALL

OF NORTHERN ILLINOIS AND NORTHWEST INDIANA. THERE IS A SLIGHT

RISK THAT SOME STORMS MAY BE STRONG TO SEVERE...PARTICULARLY OVER

NORTHERN ILLINOIS. THE GREATEST THREAT WITH THESE STORMS WILL BE

DAMAGING WINDS AND LARGE HAIL. ISOLATED TORNADOES AND LOCALLY

HEAVY RAINFALL WILL BE POSSIBLE AS WELL.

THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A


* SEVERE THUNDERSTORM WARNING FOR...

SOUTHERN BOONE COUNTY IN NORTH CENTRAL ILLINOIS...

NORTHERN DE KALB COUNTY IN NORTH CENTRAL ILLINOIS...

SOUTHERN MCHENRY COUNTY IN NORTHEAST ILLINOIS...

NORTHERN OGLE COUNTY IN NORTH CENTRAL ILLINOIS...

SOUTHEASTERN WINNEBAGO COUNTY IN NORTH CENTRAL ILLINOIS...


* UNTIL 1215 PM CDT


* AT 1127 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A

LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE

HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE

LOCATED ALONG A LINE EXTENDING FROM ROCKFORD TO OREGON...AND MOVING

EAST AT 30 MPH.


* SEVERE THUNDERSTORMS WILL BE NEAR...

STILLMAN VALLEY AND CHERRY VALLEY AROUND 1135 AM CDT.

BELVIDERE AROUND 1145 AM CDT.

MARENGO AND KIRKLAND AROUND 1210 PM CDT.

KINGSTON...GENOA AND WOODSTOCK AROUND 1215 PM CDT.


OTHER LOCATIONS IMPACTED BY THESE SEVERE THUNDERSTORMS INCLUDE NEW

MILLFORD...DAVIS JUNCTION AND UNION.


THOSE ATTENDING THE BOONE COUNTY FAIR ARE IN THE PATH

OF THESE STORMS AND SHOULD PREPARE FOR DANGEROUS WEATHER CONDITIONS.


PRECAUTIONARY/PREPAREDNESS ACTIONS...


SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER

HOUR...LARGE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR YOUR

PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME

OR BUSINESS.

SEVERE THUNDERSTORM WATCH 719 IS IN EFFECT UNTIL 100 AM CDT

FOR THE FOLLOWING LOCATIONS


COUNTY SPECIFIC MESSAGE:


/O.NEW.KWNS.SV.A.0719.110802T2225Z-110803T0600Z/


IL

.    ILLINOIS COUNTIES INCLUDED ARE


BOONE                COOK                DE KALB

DUPAGE               FORD                GRUNDY

IROQUOIS             KANE                KANKAKEE

KENDALL              LAKE                LA SALLE

LEE                  LIVINGSTON          MCHENRY

OGLE                 WILL                WINNEBAGO




AFFECTED COUNTIES:

IN ILLINOIS: BOONE, COOK, DEKALB, DUPAGE, FORD, GRUNDY, IROQUOIS, KANE, KANKAKEE, KENDALL, LA SALLE, LAKE, LEE, LIVINGSTON, MCHENRY, OGLE, WILL, WINNEBAGO.

HEAT INDEX VALUES FROM 103 TO 109

THUNDERSTORMS...A FEW MAY PRODUCE

DAMAGING WIND GUSTS IN EXCESS OF 60 MPH

LARGE HAIL

HEAVY RAINFALL

ISOLATED TORNADOES



AREAS AFFECTED AND TIMING:


HEAT INDEX VALUES WILL RANGE FROM 103 TO 109 DEGREES FROM LATE

THIS MORNING THROUGH THIS AFTERNOON ACROSS ALL OF NORTH CENTRAL

AND NORTHEAST ILLINOIS AND NORTHWEST INDIANA.


THUNDERSTORM CHANCES WILL INCREASE FROM NORTH TO SOUTH ACROSS

THE ENTIRE OUTLOOK AREA FROM LATE THIS AFTERNOON THROUGH THIS

EVENING.

...JULY HIGH TEMPERATURES 80 OR WARMER EVERYDAY IN ROCKFORD AND ALL
BUT ONE DAY IN CHICAGO...

THE HIGH TEMPERATURE REACHED AT LEAST 80 DEGREES EVERYDAY IN JULY
2011 AT ROCKFORD AIRPORT. THIS IS ONLY THE SIXTH TIME THIS HAS
HAPPENED SINCE ROCKFORD TEMPERATURE RECORDS BEGAN IN 1906. PREVIOUS
YEARS WERE 1921...1923...1935...1936...1955...AND 2002.

AT CHICAGOS OHARE AIRPORT THE HIGH TEMPERATURE REACHED 80 OR GREATER
ON 30 OF 31 DAYS IN JULY. THE ONLY YEAR THAT THE HIGH TEMPERATURE
REACHED 80 OR GREATER ON ALL 31 DAYS WAS IN 1955...WHICH IS THE
WARMEST JULY ON RECORD...AND PART OF THE WARMEST SUMMER IN CHICAGO.
A HIGH TEMPERATURE OF 80 OR GREATER ALSO OCCURRED ON 30 DAYS IN 1999
AND 2010. TEMPERATURE RECORDS FOR CHICAGO GO BACK TO 1872.

THUNDERSTORMS ARE POSSIBLE ACROSS THE ENTIRE AREA LATE TUESDAY
AFTERNOON THROUGH EARLY WEDNESDAY MORNING. SOME OF THESE
THUNDERSTORMS MAY BECOME SEVERE WITH DAMAGING WIND GUSTS. HEAVY
RAIN WILL ALSO BE POSSIBLE WITH THESE THUNDERSTORMS.

THERE IS ANOTHER CHANCE OF THUNDERSTORMS THURSDAY AFTERNOON
THROUGH EARLY SATURDAY MORNING...THEN AGAIN ON SUNDAY.

HEAT INDICES MAY EXCEED 105 DEGREES ACROSS MUCH OF THE AREA
TUESDAY.