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Hazardous Weather Outlook

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
447 AM CDT FRI AUG 22 2014

ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
231000-
WINNEBAGO-BOONE-MCHENRY-LAKE ILLINOIS-OGLE-LEE-DE KALB-KANE-
DUPAGE-COOK-LA SALLE-KENDALL-GRUNDY-WILL-KANKAKEE-LIVINGSTON-
IROQUOIS-FORD-LAKE INDIANA-PORTER-NEWTON-JASPER-BENTON-
447 AM CDT FRI AUG 22 2014 /547 AM EDT FRI AUG 22 2014/

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL ILLINOIS...
NORTHEAST ILLINOIS AND NORTHWEST INDIANA.

.DAY ONE...TODAY AND TONIGHT.

  WEATHER HAZARDS EXPECTED:

   SCATTERED THUNDERSTORMS...SOME COULD PRODUCE:
    TORRENTIAL RAINFALL AND FLASH FLOODING.
    FREQUENT CLOUD TO GROUND LIGHTNING.
    WIND GUSTS TO 50 MPH.
    NICKEL SIZE HAIL.

   AREAS AFFECTED AND TIMING:

   THUNDERSTORMS WITH HEAVY RAIN SOUTH OF INTERSTATE 80 WILL END
   THIS MORNING. ADDITIONAL THUNDERSTORMS ARE POSSIBLE THIS
   AFTERNOON AND TONIGHT...THOUGH CONFIDENCE REGARDING COVERAGE
   AND TIMING IS SOMEWHAT UNCERTAIN.

   DISCUSSION:

   VERY WARM AND HUMID AIR WILL REMAIN IN PLACE AS AN UPPER LEVEL
   RIDGE SLOWLY BUILDS ACROSS THE REGION. THUNDERSTORMS ARE
   POSSIBLE TODAY AND TONIGHT. THE MAIN THREAT FROM THESE STORMS
   WILL BE TORRENTIAL RAINFALL WHICH MAY LEAD TO FLASH FLOODING.
   WITH THE SOIL SATURATED IN MANY AREAS...ANY ADDITIONAL HEAVY
   RAIN MAY QUICKLY LEAD TO FLASH FLOODING. RAINFALL RATES WITH
   ANY THUNDERSTORMS THAT DEVELOP COULD REACH 2 TO 3 INCHES PER
   HOUR.

DENSE FOG WILL BE POSSIBLE EARLY THIS MORNING ACROSS FAR NORTHEAST
ILLINOIS.

HEAT INDICES WILL APPROACH 100 DEGREES AWAY FROM LAKE MICHIGAN
THIS AFTERNOON.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.

THERE IS A CHANCE OF THUNDERSTORMS SATURDAY AND SATURDAY NIGHT...
SUNDAY AFTERNOON...THEN MONDAY THROUGH THURSDAY. HEAVY RAIN AND
FLASH FLOODING WILL BE POSSIBLE WITH ANY THUNDERSTORMS THAT
DEVELOP.

HEAT INDICES COULD EXCEED 100 DEGREES SUNDAY AND MONDAY AFTERNOONS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER REPORTS OF RAINFALL AND FLOODING WILL BE APPRECIATED.

&&

$$



Flash Flood Warning

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
348 AM CDT FRI AUG 22 2014

ILC031-043-INC089-221330-
/O.CON.KLOT.FF.W.0024.000000T0000Z-140822T1330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
DUPAGE IL-COOK IL-LAKE IN-
348 AM CDT FRI AUG 22 2014

...FLASH FLOOD WARNING REMAINS IN EFFECT FOR NORTHWESTERN LAKE...COOK
AND DUPAGE COUNTIES UNTIL 830 AM CDT...

AT 347 AM CDT...DOPPLER RADAR INDICATED THAT THE EXTREMELY HEAVY
RAINFALL HAS MOVED OUT OF THE AREA...WITH ONLY LIGHT TO MODERATE
RAIN CONTINUING. HOWEVER...TOTAL RAINFALL AMOUNTS OF 3 TO 5 INCHES
OCCURRED ACROSS PORTIONS OF THE WARNED AREA WITHIN ONLY A FEW HOUR
PERIOD FROM THESE THUNDERSTORMS. THEREFORE...RUNOFF FROM THIS HEAVY
RAINFALL WILL LIKELY CONTINUE TO LEAD TO AREAS OF FLASH FLOODING
ACROSS THE REGION THIS MORNING...WITH SOME ROADS LIKELY REMAINING
IMPASSIBLE FOR SEVERAL HOURS.

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
ADDISON...ALSIP...BERWYN...BLUE ISLAND...BROOKFIELD...BURNHAM...BURR
RIDGE...CALUMET CITY...CAROL STREAM...CHATHAM...CHICAGO...CHICAGO
HEIGHTS...CICERO...DOLTON AND DOWNERS GROVE.


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... UNDERPASSES AND LOW LYING AREAS.

&&

LAT...LON 4196 8763 4191 8762 4190 8760 4184 8760
      4175 8753 4170 8751 4169 8748 4138 8750
      4139 8753 4147 8753 4147 8779 4156 8780
      4156 8791 4164 8791 4164 8803 4173 8803
      4172 8826 4206 8826 4207 8824 4212 8824

$$

BIRK








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