* WHAT...Heavy lake effect snow expected. Total snow accumulations 10 to 20 inches in the most persistent lake snows. Winds gusting as high as 45 mph will produce considerable blowing and drifting snow.

* WHERE...Northern Erie and Genesee Counties.

* WHEN...From 10 PM this evening to 1 PM EST Friday.

* IMPACTS...Travel will be very difficult with deep snow cover on roads and very poor visibility. Areas of blowing snow will significantly reduce visibility, with near whiteout conditions at times. The hazardous conditions could impact the Thursday morning and evening commutes.