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Showing results for tags 'april 21 2021'.
...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 2 PM EDT WEDNESDAY... * WHAT...Snow expected. Total snow accumulations of 3 to 6 inches. * WHERE...Niagara, Orleans, Erie, Genesee, Wyoming, Chautauqua, and Cattaraugus counties. * WHEN...From midnight tonight to 2 PM EDT Wednesday. The heaviest snow will fall from the pre-dawn hours through mid to late morning. * IMPACTS...Plan on slushy and very slippery road conditions. The hazardous conditions will impact the Wednesday morning commute. This will be a heavy, wet snow, and may result in isolated power outages and a few downed tree limbs. It appears that there will be a window of at least several hours late tonight and Wednesday morning when the snowfall rates will be heavy enough not have too much of a problem sticking to grassy and untreated surfaces at onset. In fact, some mesoscale guidance suggesting the potential for snowfall rates of 1 to 2 inches per hour in some areas. A challenging part of the forecast is trying to figure out how much snow is able to accumulate on warmer pavement surfaces which could limit snowfall amounts, but this should only be an issue very early on. Once paved surfaces get a layer of snow, accumulation will certainly be no problem thereafter. Enhancement from the lakes could also come into play as the flow turns more northerly which could send amounts a bit higher. The synoptic snow should quickly clear much of the area by Wednesday afternoon, setting the stage for some lake effect snow showers Wednesday night. Northwest flow will focus most of this into the western Southern Tier off Lake Erie, and from Orleans County eastward across Rochester to Oswego County and down into the Finger Lakes off Lake Ontario. Upslope flow will also keep more widespread snow showers going across the higher terrain east of Lake Ontario. We will likely see additional localized accumulations in the most persistent bands.