(Updated at 5:30 p.m. on Sunday) The National Weather Service has issued a Winter Storm Warning Sunday night and Monday for snow and mixed precipitation in Oneida, Madison, Otsego Counties. A Winter Storm Warning is now posted for Herkimer County.

Winter Storm Izzy, initially predicted to be a Nor'easter, traveled inland and is expected to impact areas further west as it comes up through the Ohio Valley. Forecasters say the storm will start out with snow, heavy at times, and then turn to mixed precipitation over night and into Monday morning.

WINTER STORM WARNING IN EFFECT UNTIL 5 PM EST MONDAY
WHAT...Heavy mixed precipitation expected. Total snow accumulations of 5 to 9 inches and ice accumulations of a light glaze. Winds gusting as high as 40 mph. (Herkimer County: 6-12 inches)  
WHERE...Otsego, Oneida, Onondaga, Chemung, Tompkins, Madison, Cortland, Herkimer and Tioga counties.
WHEN...Until 5 PM EST Monday. IMPACTS...Travel could be very difficult. The hazardous conditions could impact the morning or evening commute. (Herkimer County's storm warning is from 10 p.m. Sunday to 10 p.m. Monday.)
ADDITIONAL DETAILS...Snowfall rates this evening could reach up to 1 inch per hour at times up until 1 AM, then precipitation will become a icy mix of snow, sleet, and freezing rain.  (Herkimer County: Snowfall rates of 1 to 2 inches per hour are possible at times between 1 and 9 am. The snow will change to a wintry mix or sleet and rain in the early afternoon before changing back over to snow.)
-Weather.com
Winter Weather Warning Graphic Credit: National Weather Service
Winter Weather Warning Graphic Credit: National Weather Service
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Meteorologists say snow, sleet and freezing rain could make driving conditions hazardous on the Monday morning commute. The storm's impact will be dulled somewhat because of Martin Luther King Day on Monday, which means all schools, government offices, mail service and banks are already closed.
This is a developing story and may be updated periodically.

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