Flash Flood Warning 7, NWS Chicago, IL

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHICAGO IL
235 AM CDT MON JUL 10 2000

PRESENT SCENARIO INVOLVES FLOODING AND POSSIBLE SEVERE WX THIS
MORNING ACROSS NRN IL/NW IN. SEVERAL FLOOD WARNINGS OUT AND MORE
LIKELY TO FOLLOW AS DERECHO LOOKING BOW IN NERN IA IMPENDING ACROSS
NRN IL BFR DAWN. THIS ADDING MORE FLOODING AND RISK OF HIGH WINDS.
WOULD THINK LINE OF STORMS IN ECNTL IL FROM OLD OUTFLOW FROM
YESTERDAY MORNING. DEWPOINT DISCONTINUITY AT SFC CAN SUPPORT THIS
BOUNDARY. HOWEVER NEW DEVELOPMENT FROM THIS LINE BACK TO DBQ FAVORS
ETA MODEL 700 MB HIGH DEWPOINT AXIS.

FOLLOWING ETA THIS MORNING WOULD PINPOINT BOW ECHO IN ERN IA
ASSOCIATED WITH SHORT WAVE AT SAME LOCATION TO DRIVE EASTSOUTHEAST
ACROSS NRN IL TO NWRN INDIANA BY DAYBREAK. SECONDARY WAVE NOW IN ERN
NEBRASKA TO FOLLOW ON ITS HEALS DURING THE DAY...SO HEAVY RAIN AND
HIGH WINDS NOT LIMITED TO THE MORNING HOURS AND WILL CONTINUE RISK
OF TSTMS INTO THE EVENING HOURS. EVEN CONTINUE THROUGH TNGT FOR SRN
CWA.

ETA SHOWS FRONT...NOW MEANDERING ACROSS SRN OR CNTL WISCONSIN...TO
DROP THRU NRN IL/NWRN IN SOMETIME LATE THIS AFTN INTO ERY EVENING.
SFC HIGH BUILDING DOWN OUT OF CANADA TONIGHT HELPING TO STABILIZE
...COOL...AND DRY THE AREA LATE TONIGHT AND TUESDAY. SFC HIGH SHIFTS
OFF TO THE EAST TUES NIGHT. WAVE DRIVING SEWD DOWN UPPER FLOW
REFLECTED BY SFC LO ALONG OLD FRONTAL BOUNDARY IN CENTRAL IL.
OVERRUNNING MSTR RETURNING THREAT OF RAIN TO NRN IL/NWRN IN ON WED
WITH HIGH PRESSURE BUILDING INTO NRN IL ONCE AGAIN WED NIGHT AND
THURSDAY. FAN AND FWC TEMPS NRLY IDENTICAL. WILL CONTINUE TO
FOLLOW.

.CHI...FFW OGLE...LEE...DE KALB...LA SALLE...LIVINGSTON...
FORD...IROQUOIS COUNTIES IN ILLINOIS AND NEWTON...JASPER...
AND BENTON COUNTIES IN INDIANA TIL 600 AM. WW#563 TIL 8AM FOR NRN IL.

BRUMER

ILZ003>006-008-010>014-019>023-032>033-039-INZ001>002-010>011-019-
101100-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO IL
432 AM CDT/EST MON JUL 10 2000

...SEVERE THUNDERSTORM WATCH FOR MUCH OF NORTHERN ILLINOIS THROUGH
800 AM THIS MORNING...
...FLASH FLOOD WARNINGS POSTED FOR PORTIONS OF NORTHERN ILLINOIS AND
NORTHWEST INDIANA UNTIL 600 AM...

MORE THUNDERSTORMS ARE ROLLING SOUTHEAST THROUGH LA SALLE...LIVINGSTON
...FORD...AND IROQUOIS COUNTIES IN ILLINOIS AND NEWTON...JASPER...AND
BENTON COUNTIES IN INDIANA WHERE A FLASH FLOOD WARNING REMAINS IN
EFFECT. THE SAME IS TRUE FOR OGLE...LEE...AND DE KALB COUNTIES IN
ILLINOIS. ALREADY UP TO 4 INCHES OF RAIN HAS FALLEN OVER PARTS OF SOME
OF THESE COUNTIES. PROSPECTS FOR ANOTHER COUPLE INCHES EXISTS WITH
THESE NEW LINES OF STORMS.

THE LINE IN NORTH CENTRAL ILLINOIS IS PART OF A POSSIBLY SEVERE BAND
OF STORMS IMPENDING UPON NORTHERN PORTIONS OF NORTHEAST ILLINOIS SUCH
AS MCHENRY...LAKE...KANE...DU PAGE...AND COOK COUNTIES. THE MORE
SEVERE LOOKING PORTION ROLLED THROUGH ROCKFORD BUT ONLY PRODUCED 35 TO
40 MPH WINDS. HOWEVER HEAVY RAINS FROM THIS LINE OF STORMS COULD SET
THE REST OF NORTHERN ILLINOIS AND NORTHWEST INDIANA FOR FLOODING LATER
THIS MORNING. A NEW AREA OF STORMS HAS SPRUNG UP IN EASTERN IOWA AND
WILL SPREAD INTO NORTHWEST ILLINOIS BY DAYBREAK. IF THESE NEWER STORMS
MAINTAIN THEIR STRENGTH...ANOTHER COUPLE INCHES IS IN STORE FOR
NORTHERN ILLINOIS AND NORTHWEST INDIANA.

COMMUNITIES SHOULD BE ALERT FOR STRONG WINDS AND HEAVY RAIN WITH THE
STORMS THIS MORNING. FLOODING IS LIKELY TO BE THE BIGGEST PROBLEM.
MOTORISTS SHOULD AVOID DRIVING ACROSS FLOODED ROADWAYS AND BE PREPARED
TO TAKE ALTERNATE ROUTES.

BRUMER

ILZ003>006-008-010>014-019>023-032>033-039-INZ001>002-010>011-019-
101135-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO IL
535 AM CDT/EST MON JUL 10 2000

...SEVERE THUNDERSTORM WATCH CANCELLED FOR PORTIONS OF NORTHERN
ILLINOIS...

THE SEVERE THUNDERSTORM WATCH IS CANCELLED FOR WINNEBAGO...OGLE
...BOONE...AND MCHENRY COUNTIES. THE LINE OF STRONG STORMS HAS MOVED
OUT OF THE AREA AND NO LONGER POSES A THREAT TO THOSE COUNTIES. RAIN
WILL CONTINUE FOR THE NEXT FEW HOURS. NEW STORMS MOVING OUT OF IOWA
APPEAR TO BE HEADED SOUTH OF THESE AREAS.

BRUMER

ILZ003>006-008-010>014-019>023-032>033-039-INZ001>002-010>011-019-
101150-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO IL
550 AM CDT/EST MON JUL 10 2000

...SEVERE THUNDERSTORM WATCH CANCELLED FOR PORTIONS OF NORTHEAST
ILLINOIS...

THE SEVERE THUNDERSTORM WATCH IS CANCELLED FOR LEE...DE KALB...KANE
...DU PAGE...AND LAKE COUNTIES IN ILLINOIS. THE LINE OF STRONG STORMS
HAS MOVED OUT OF THE AREA AND NO LONGER POSES A SEVERE WEATHER THREAT.
RAIN WILL CONTINUE FOR THE NEXT SEVERAL HOURS. NEW STORMS MOVING OUT
OF IOWA SHOULD MOVE SOUTH OF THESE AREAS.

BRUMER

ILZ003>006-008-010>014-019>023-032>033-039-INZ001>002-010>011-019-
101700-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHICAGO IL
600 AM CDT/EST MON JUL 10 2000

FOR NORTH CENTRAL AND NORTHEAST ILLINOIS AND NORTHWEST INDIANA...

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS TODAY AND TONIGHT.

SEVERAL DISTURBANCES ARE EXPECTED TO MOVE FROM THE WEST TODAY. THESE
WAVES WILL GENERATE THUNDERSTORMS ACROSS IOWA THAT WILL CONTINUE TO
DRIFT EAST SOUTHEAST INTO NORTHERN ILLINOIS AND NORTHWEST INDIANA.
HEAVY RAINS WILL STILL BE A PROBLEM AS WELL. FLOODING SHOULD RECEDE
LATER THIS MORNING BUT COULD AGAIN ARISE WITH ANOTHER BOUT OF STORMS
THIS AFTERNOON AND EVENING.

A COLD FRONT WILL PUSH SLOWLY DOWN FROM THE NORTH THIS AFTERNOON INTO
THE EVENING HOURS...HELPING TO DRY AND STABILIZE THE AREA. A RISK OF
THUNDERSTORMS WILL CONTINUE WELL INTO TONIGHT FOR THE SOUTHERN TIER OF
THE AREA.

BRUMER