HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 339 PM CDT TUE JUN 25 2013 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- 339 PM CDT TUE JUN 25 2013 /439 PM EDT TUE JUN 25 2013/ THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL ILLINOIS...NORTHEAST ILLINOIS AND NORTHWEST INDIANA. .DAY ONE...TONIGHT. WEATHER HAZARDS EXPECTED: THUNDERSTORMS...THE STRONGEST MAY PRODUCE: DAMAGING WINDS...POTENTIALLY IN EXCESS OF 70 MPH. FREQUENT CLOUD TO GROUND LIGHTNING. HAIL TO THE SIZE OF QUARTERS. AND HEAVY RAIN AND FLASH FLOODING. AREAS AFFECTED AND TIMING: THUNDERSTORMS ARE EXPECTED TO DEVELOP THIS AFTERNOON AND EVENING...POSSIBLY FORMING INTO ANOTHER LINE OF SEVERE THUNDERSTORMS. THESE STORMS LOOK TO IMPACT PORTIONS OF NORTHERN ILLINOIS AND NORTHWESTERN INDIANA LATE THIS AFTERNOON AND EVENING. ADDITIONAL THUNDERSTORMS WILL ALSO AFFECT PORTIONS OF THE AREA LATER TONIGHT. DISCUSSION: AN UPPER LEVEL DISTURBANCE OVER EASTERN IOWA IS INTERACTING WITH AN UNSTABLE ATMOSPHERE LEADING TO THE DEVELOPMENT OF SHOWERS AND THUNDERSTORMS ACROSS PORTIONS OF THE REGION. THESE STORMS WILL POSS A SEVERE THREAT THROUGH EARLY THIS EVENING. THE MAIN THREATS FROM THESE THUNDERSTORMS WILL BE WIND GUSTS IN EXCESS OF 70 MPH AND HAIL TO THE SIZE OF QUARTERS. PERIODS OF HEAVY RAINFALL WILL LIKELY ACCOMPANY THESE STORMS. ADDITIONAL THUNDERSTORMS ARE EXPECTED TONIGHT AS A LOW LEVEL JET STRENGTHENS...AND THESE STORMS COULD BE SLOW MOVING AND CONTAIN VERY HEAVY RAINFALL. THEREFORE...THE POTENTIAL FOR FLASH FLOODING DOES REMAIN A CONCERN...ESPECIALLY ACROSS AREAS THAT HAVE RECEIVED HEAVY RAINFALL IN THE PAST 24 TO 48 HOURS. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY. THERE WILL BE PERIODIC CHANCES FOR THUNDERSTORMS WEDNESDAY THROUGH FRIDAY. SOME OF THESE STORMS COULD BE SEVERE WEDNESDAY. THERE IS ALSO A CONTINUED THREAT OF VERY HEAVY RAINFALL ACROSS NORTHERN ILLINOIS AND NORTHWESTERN INDIANA INTO WEDNESDAY. THIS HEAVY RAINFALL COULD RESULT IN FLASH FLOODING AND SIGNIFICANT RISES ON AREA RIVERS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS REQUESTED THIS EVENING...ESPECIALLY ALONG AND SOUTH OF INTERSTATE 80.
Posted on: Tue, 25 Jun 2013 21:40:26 +0000
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