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      First winter weather advisory of 2012

      Sylvan Beach

      Many Central New Yorkers have been wondering when winter was finally going to arrive - the wait is finally over.

      Today, areas of CNY have started to see a rain/snow mix change to blowing snow, heavy at times.

      Onondaga County: Centro says that bus schedules have not changed due to the weather conditions, but they are running about 10-15 minutes behind.

      Onondaga County: The DOT reports that US 20 is closed in both directions in the Town of Onondaga from Amber Rd to Fox Rd due to a jackknifed tanker truck accident around 11:00am.

      Oswego County: A winter parking ban has been issued for the city of Oswego. Mayor Gillen announced that the pan will go into effect at 1:00am Saturday morning and remain in effect until further notice. During the ban, vehicles are prohibited from parking on all highways and streets between 1:00 a.m. and 6:00 a.m.

      Lewis County: A travel advisory is in effect for Lewis County. The Lewis County Sheriff's Office has issues a No Unnecessary Travel Advisory beginning at 10:00am and extending until further advised.

      Jefferson County: A travel advisory is in effect in Jefferson County. Jefferson County Sheriff's deputies report numerous car accidents due to deteriorating conditions with white outs in some spots. 126 in Watertown was closed for about an hour due to a 8:00am multi-car crash Friday morning.

      Onondaga County: A pair of accidents, including a tractor-trailor, caused traffic backups on both sides of I-90 between Syracuse and Rochester Friday morning, according to state police.

      All drivers are urged to use caution.

      Temperatures are expected to fall to the mid/upper 20s as the day progresses.

      Much of CNY can expect 3-5 inches while areas east/southeast of Lake Ontario can expect closer to 4-8 inches.

      Tonight, brisk winds, variable clouds, lake-effect snow showers and flurries will start east of Lake Ontario, then move east/southeast of the lake later into the night. Another 1-3" is expected for Syracuse tonight with 2-5" expected east/southeast of the lake.

      Two separate storms are currently fusing together, developing one more powerful storm by this afternoon and evening which will drift up to our northeast. This setup is favorable for drawing down Arctic air, and will bring us easily some of the coldest air of the season with overnight lows by the weekend well below zero for many rural viewers, and low single digits even for urban viewers.

      Most of todayâ??s snow is in association with the area of low pressure in general. Then, weâ??ll get some help from the lakes starting late this afternoon in the form of lake-enhanced snow and snow showers right through Saturday. Todayâ??s temperatures will continue to drop into the mid and upper 20s (some spots even cooler) by the end of today, creating slick driving conditions. Any untreated surface will be subject to icing today, so use extreme caution if you choose to travel before roads have been treated.

      Even though we are turning quite cold, and generating a large lake-to-air temperature difference, and winds are favorable out of the northwest Saturday, we wonâ??t have a huge lake-effect outbreak on Saturday. The reason for this lies in whatâ??s called â??ambient moistureâ??, which is just a fancy way of saying moisture thatâ??s already present in the atmosphere, before the lake starts to add more. This is important because we have a very dry, cold arctic air mass building in behind todayâ??s cold front, and truly settling in Saturday. Without a large amount of â??ambient moistureâ?? in such a cold, dry air mass, the lake has to work harder to moisten-up the air passing over it, to get it to the point it can produce snow. As a result of that, less snowfall is projected for Saturday, making cold temperatures the bigger concern for this weekend.

      For all the latest weather, click here.

      All school closings can be found here .

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