* WHAT...Heavy snow expected. Total snow accumulations between 12 and 18 inches, with localized amounts up to 22 inches. Northwest winds gusting as high as 35 mph Monday afternoon will cause areas of blowing and drifting snow. * WHERE...Portions of central New York and northeast Pennsylvania. * WHEN...Until 7 PM EST Monday. * IMPACTS...Travel could be very difficult to impossible. Areas of blowing snow could significantly reduce visibility. The hazardous conditions could impact the Monday morning and evening commutes. * ADDITIONAL DETAILS... Snowfall will likely be very heavy at times this afternoon into the evening with hourly rates potentially exceeding 2 inches per hour. The snow tapers down this evening. Temperatures will be very cold throughout this storm, hovering in the upper single digits to teens the entire time, with colder wind chills.