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Heavy Rain Threat 7/21-7/24


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MESOSCALE DISCUSSION 1717

NWS STORM PREDICTION CENTER NORMAN OK

0615 AM CDT SUN JUL 24 2011

AREAS AFFECTED...PART OF NORTH CENTRAL-NERN IL

CONCERNING...HEAVY RAINFALL

VALID 241115Z - 241345Z

HEAVY RAINFALL RATES /1.5-2 INCH PER HOUR WITH LOCALLY HIGHER RATES

UP TO 3 INCH PER HOUR/ EXPECTED TO PERSIST AND DEVELOP/SPREAD ESEWD

ACROSS NRN IL EARLY THIS MORNING...REACHING THE CHICAGO METRO AREA

AFTER 13Z.

EARLY MORNING SURFACE ANALYSES AND REGIONAL RADAR IMAGERY SHOWED A

CONVECTIVE OUTFLOW BOUNDARY...ATTENDANT TO A WEAKENING MCS THAT

RECENTLY MOVED EWD ACROSS LAKE MICHIGAN...EXTENDED FROM SRN LAKE

MICHIGAN SWWD INTO FAR NRN IL. TSTMS HAD FORMED E-W ALONG AND JUST

NORTH OF THIS BOUNDARY FROM MCHENRY TO JO DAVIESS COUNTIES IL.

ADDITIONAL STORMS HAD FORMED IN A LINEARLY N-S ORIENTATION FROM FAR

NWRN IL TO HENRY COUNTY IL. WEAK EFFECTIVE BULK SHEAR OF 20-25 KT

SUGGESTS THE OVERALL SEVERE WEATHER THREAT SHOULD REMAIN LOW...WHILE

THE GREATER THREAT WILL BE HEAVY RAINFALL RATES OF 1.5-2 INCHES PER

HOUR...WITH LOCALLY HIGHER RATES UP TO 3 INCHES PER HOUR POSSIBLE.

CORFIDI PROPAGATION VECTORS ARE EWD AT 5 KT AND PRECIPITABLE WATER

VALUES EXCEEDING 2 INCHES ACROSS NRN IL ARE SUFFICIENT TO SUPPORT

HEAVY RAINFALL RATES. IN ADDITION...THE COMBINATION OF THE EWD

MOVING LINE OF STORMS AND THE SEWD TRANSLATION OF THE GENERALLY E-W

ORIENTED CONVECTION WILL MAINTAIN A LIKELIHOOD FOR TRAINING STORMS

OVER NRN IL THROUGH 15Z.

POINT FORECAST SOUNDINGS SUGGEST THE NRN IL TSTM COMPLEX IS ROOTED

IN THE LOW-MID LEVELS /800-700 MB LAYER/ WITH OBJECTIVE ANALYSES

INDICATING WLY 700 MB FLOW EXTENDING FROM IA WHERE A RESERVOIR OF

STRONG INSTABILITY EXISTS. THUS...MOIST/UNSTABLE WAA IN THIS LAYER

IS EXPECTED TO MAINTAIN THE LIKELIHOOD FOR CONTINUED STORM

DEVELOPMENT AS THE ACTIVITY MOVES ESEWD.

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ILC031-089-093-197-241930-

/O.NEW.KLOT.FF.W.0025.110724T1326Z-110724T1930Z/

/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED

FLASH FLOOD WARNING

NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL

826 AM CDT SUN JUL 24 2011

THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A

* FLASH FLOOD WARNING FOR...

KENDALL COUNTY IN NORTHEAST ILLINOIS...

NORTHERN WILL COUNTY IN NORTHEAST ILLINOIS...

SOUTHERN COOK COUNTY IN NORTHEAST ILLINOIS...

SOUTHERN KANE COUNTY IN NORTHEAST ILLINOIS...

* UNTIL 230 PM CDT SUNDAY

* AT 823 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED

SLOW MOVING THUNDERSTORMS ALONG A LINE FROM SUGAR GROVE TO

CHICAGO. RADAR ESTIMATES THAT TWO TO THREE INCHES...WITH LOCALIZED

HIGHER AMOUNTS HAVE FALLEN ACROSS THE WARNED AREA.

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PRELIMINARY LOCAL STORM REPORT

NATIONAL WEATHER SERVICE LINCOLN IL

819 AM CDT SUN JUL 24 2011

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...

..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....

..REMARKS..

0745 AM HEAVY RAIN BRADFORD 41.18N 89.66W

07/24/2011 M2.58 INCH STARK IL COCORAHS

RAINFALL IN THE PAST HOUR

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Could use some of that rain in MI...

Past 30 days percent of normal:

post-542-0-03756400-1311518485.png

Incredible how quickly my grass went from green and under water from flooding in the middle of may to almost brown and dorment now. Also its been interesting to see the storms train and dump rain along i80 to the south of here while we get nothing. I see Pennsylvania and new York aren't doing much better.

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A lone cell is drenching the Mount Clemens area... Boundries galore visible on the DTX radar, we'll see if anything else can fire up.

sitting right over my house. loud clap of thunder scared the crap outta me. I thought the sun was out. Been raining heavily for about 20 mins now

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