...WINTER STORM WARNING IN EFFECT FROM 6 PM THIS EVENING TO 6 AM CST TUESDAY... THE NATIONAL WEATHER SERVICE IN LINCOLN HAS ISSUED A WINTER STORM WARNING FOR HEAVY SNOW...WHICH IS IN EFFECT FROM 6 PM THIS EVENING TO 6 AM CST TUESDAY. THE WINTER WEATHER ADVISORY HAS BEEN REPLACED BY THIS WARNING. * TIMING...SNOW WILL BEGIN MOVING INTO AREAS WEST OF THE ILLINOIS RIVER THIS AFTERNOON...AND REMAIN STEADY THROUGH MIDNIGHT BEFORE DIMINISHING. THE HEAVIEST SNOWFALL WILL OCCUR DURING THE EVENING. * ACCUMULATIONS...5 TO 7 INCHES ARE LIKELY BEFORE THE SNOW DIMINISHES AFTER MIDNIGHT. THE HEAVIEST TOTALS ARE EXPECTED TO BE NORTH OF THE I-74 CORRIDOR. * IMPACTS...ROADS WILL QUICKLY BECOME SNOW COVERED AND SLIPPERY THIS EVENING. TREACHEROUS ROADS WILL BE HAVE ADDITIONAL DIFFICULTY BECAUSE OF HOW QUICKLY THE SNOW WILL ACCUMULATE--THE PLOWS MAY HAVE A DIFFICULT TIME KEEPING UP WITH THE HEAVY SNOW. IN ADDITION...VISIBILITY WILL BE BELOW A MILE AT TIMES IN THE HEAVIER SNOW BANDS. SOME DRIFTING OF SNOW IS POSSIBLE AS WELL. Includes McLean, Tazewell, and Woodford counties. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER STORM WARNING FOR HEAVY SNOW MEANS SEVERE WINTER WEATHER CONDITIONS ARE EXPECTED OR OCCURRING. SIGNIFICANT AMOUNTS OF SNOW ARE FORECAST THAT WILL MAKE TRAVEL DANGEROUS. ONLY TRAVEL IN AN EMERGENCY. IF YOU MUST TRAVEL...KEEP AN EXTRA FLASHLIGHT...FOOD...AND WATER IN YOUR VEHICLE IN CASE OF AN EMERGENCY.