Thursday also could see light sleet and snow in the afternoon and evening, according to the service.
The fog will reduce visibility in some areas to a quarter-mile or less, the weather service said in its advisory.
On Thursday in McHenry County, highs are expected to be in the low 50s, with temperatures falling to the mid-30s by the evening. There is not enough instability to cause severe weather, but expect heavier downpours in any thunderstorms that do arise. If this were to happen, which is unlikely but still possible, no accumulation nor travel concerns will arise.
The National Weather Service has issued a dense fog advisory for all of East Central Illinois except Ford and Iroquois counties until 12 p.m. Tuesday.
Late this morning and toward noon, the fog lifts and we are left with a mostly cloudy sky and temperatures in the 60s. By the time our temperatures drop below freezing the precipitation should be gone.
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