THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL ILLINOIS... NORTHEAST ILLINOIS AND NORTHWEST INDIANA. .DAY ONE...TODAY AND TONIGHT. WEATHER HAZARDS EXPECTED: THUNDERSTORMS...SOME OF WHICH MAY BE SEVERE WITH: DAMAGING WINDS. VERY HEAVY RAINFALL. ISOLATED LARGE HAIL AND TORNADOES. AREAS AFFECTED AND TIMING: SCATTERED THUNDERSTORMS MAINLY ALONG AND SOUTH OF INTERSTATE 80 THIS MORNING WILL BE CAPABLE OF HEAVY RAINFALL. MORE STORM DEVELOPMENT IS EXPECTED OVER THE AREA DURING THE AFTERNOON INTO THE NIGHT PRESENTING SEVERE WEATHER AND CONTINUED HEAVY RAINFALL POTENTIAL. DISCUSSION: A MOIST AIR MASS WILL BECOME INCREASINGLY UNSTABLE BY AFTERNOON PRESENTING GREATER CHANCES FOR THUNDERSTORMS. AS MULTIPLE UPPER LEVEL DISTURBANCES MOVE OVER THE AREA LATER THIS AFTERNOON AND TONIGHT...NUMEROUS STORMS ARE EXPECTED TO DEVELOP. ALL OF THESE WILL BE CAPABLE OF HEAVY RAINFALL...SOME OF WHICH COULD CREATE FLASH FLOODING. THE PRIMARY SEVERE WEATHER THREAT WITH ANY ORGANIZED STORMS WILL BE DAMAGING WINDS. THERE IS AN ISOLATED LARGE HAIL AND TORNADO THREAT...PRIMARILY WEST OF HIGHWAY 47 IN NORTH CENTRAL ILLINOIS THIS AFTERNOON AND EVENING. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY. THERE WILL BE A LINGERING CHANCE OF THUNDERSTORMS ON WEDNESDAY... ESPECIALLY SOUTH OF INTERSTATE 80. SOME OF THESE IN THE MORNING MAY PRODUCE HEAVY RAINFALL...THOUGH SEVERE WEATHER IS UNLIKELY. SMALL CHANCE FOR STORMS RETURN LATE IN THE WEEKEND INTO EARLY NEXT WEEK ACROSS FAR NORTHERN ILLINOIS. .SPOTTER INFORMATION STATEMENT... SPOTTERS MAY BE NEEDED THIS AFTERNOON AND TONIGHT.
Posted on: Tue, 09 Jul 2013 10:45:14 +0000