NWS Hazardous Weather Outlook Hazardous Weather Outlook National Weather Service Chicago/Romeoville Illinois 434 PM CST Monday January 28 2013 ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019- 292245- Winnebago-Boone-McHenry-Lake Illinois-Ogle-Lee-De Kalb-Kane- dupage-Cook-La Salle-Kendall-Grundy-Will-Kankakee-Livingston- Iroquois-Ford-434 PM CST Monday January 28 2013 /534 PM est Monday January 28 2013/ This Hazardous Weather Outlook is for north central Illinois, northeast Illinois and northwest Indiana. DAY ONE - TONIGHT. weather hazards expected: locally dense fog. scattered thunderstorms, some May produce: heavy downpours. cloud to ground lightning. and small hail. areas affected and timing: areas of dense fog have spread north through central Illinois and Indiana to just north of the Illinois and Kankakee river valleys. It is possible that the dense fog May spread north to the Interstate 80 corridor, especially over more rural areas. there is a chance that the fog May spread farther north of i-80 later tonight. scattered thunderstorms will likely develop late this evening and continue into the overnight hours, with the greatest coverage of thunderstorms is likely to be north of Interstate 80. discussion: a weak front will stall out over central Illinois and Indiana with dense fog along and north of the front through tonight as winds diminish. Fog should tend to dissipate overnight as warm air surges north into the region as the front lifts north tonight. also as the front lifts back north tonight, scattered thunderstorms are forecast to develop. While severe weather appears unlikely overnight tonight due to weak instability, cold air aloft could allow for some small hail along with heavy rain with the stronger storms. DAYS TWO THROUGH SEVEN - TUESDAY THROUGH SUNDAY. thunderstorms are possible Tuesday morning and early afternoon but will become more likely by late Tuesday afternoon and evening. Very strong winds aloft and increasing moisture near the surface will create an environment favorable for severe thunderstorms should sufficient instability develop. The greatest severe threat will be for strong damaging winds, but an isolated tornado cannot be ruled out. while there is a risk of severe thunderstorms, the greater threat to the region will be from heavy rainfall and flooding. widespread rainfall totals of one to two inches appear likely with localized amounts in excess of three inches possible by Wednesday morning. Rainfall of this magnitude will likely result in flooding, potentially significant flooding. there is a chance of accumulating snow on Wednesday. SPOTTER INFORMATION STATEMENT Spotter activation will not be necessary through tonight. |
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