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Friday, December 17, 2021

Saturday 4 am to 1 pm:
Winter weather advisory issued for Wyoming and Livingston counties

National Weather Service Buffalo NY
153 PM EST Fri Dec 17 2021
Including the cities of Warsaw, Geneseo, Canandaigua, Jamestown, Olean, and Wellsville
153 PM EST Fri Dec 17 2021


* WHAT...Snow...changing to sleet and freezing rain...then to plain rain expected. Total snow accumulations less than 2 inches and ice accumulations of a trace to a few hundredths of an inch.

* WHERE...Wyoming, Livingston, Ontario, Chautauqua, Cattaraugus, and Allegany counties.
* WHEN...From 4 AM to 1 PM EST Saturday.
* IMPACTS...Plan on slippery road conditions.

Periods of snow, sleet or freezing rain will result in slippery roads and limited visibilities. Slow down and use caution while driving.

For a more detailed weather account in paragraph form, written by Ben Beagle of the Batavia Daily News, click on:

A storm system will bring a wintry mix of snow, ice and rain to the region early Saturday through Saturday evening before transitioning to lake effect snow Saturday night and Sunday, reports the National Weather Service. The wintry conditions has prompted the Weather Service to issue a winter weather advisory that will be in effect Saturday from 4 a.m. to 1 p.m. in Livingston and Wyoming counties. The advisory also includes Ontario, Chautauqua, Cattaraugus and Allegany counties.

Snow, changing to sleet and freezing rain, then to plain rain is expected, according to the Weather Service. Total snow accumulations of less than 2 inches and ice accumulations of a trace to a few hundredths of an inch are forecast. The Weather Service advises motorists to plan on slippery road conditions. Slow down and use caution while driving.

Periods of snow, sleet or freezing rain will result in slippery roads and limited visibilities. Slippery spots are possible Saturday morning in addition to later Saturday night as precipitation ends as a little snow, the Weather Service said. No advisories had been issued for Genesee or Orleans counties as of mid-afternoon Friday.

The Weather Service does advise that a few inches of snow accumulation is possible Saturday into Saturday night in Genesee, Orleans, Niagara, Monroe, Wayne, northern Cayuga and northern Erie counties. There could be a brief mix with sleet or freezing rain Saturday. The New York State Thruway looks to be the delineation line between rain/wintry mix to the south and mainly snow to the north, the Weather Service said in a forecast discussion Friday afternoon.

Confidence at this point is relatively high that the cold air will hold north of the Thruway, even through the daylight hours Saturday. This will result in a mainly snow event. For areas south of the Thruway a wintry mix is initially likely before a transition to rain. The wintry mix is not excepted to be of long duration which should limit any icing to fairly light amounts of less than a tenth of an inch, the discussion said.

Snow accumulation potential will be greatest where the cold air can hold on the longest. Best potential for roadways and paved surfaces to see accumulations will be north of the Thruway, and depending on rates, could see totals in the 3-6 inch range, with the higher end of this range most likely over the higher terrain of the Tug Hill east of Lake Ontario with amounts closer to 3 inches west of Rochester, including Batavia and Buffalo, the discussion said.

The Weather Service did caution that the preliminary snow amounts could easily change depending on the low’s track which will be a big determining factor with the thermal profile.

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