... Rain and snow showers will taper off this evening, with intermittent snow showers expected on Saturday and Sunday as a low pressure system crosses the region.
NEAR TERM /UNTIL 6 AM SATURDAY MORNING/... Latest analysis shows precipitation coming to an end for the evening across the southwestern half of the forecast area as a cold frontal boundary pushes into the region. Hourly temperatures have been nudged down to the latest trends as colder air is ushered in behind the front. This has shifted the forecast rain/snow line slightly farther east, but will make little impact in overall snow totals for the evening. Previous discussion follows...
Rain and snow will continue to track east this evening with a crossing frontal system. Given warm sfc temperatures accumulations will be limited to the higher terrain which could see an inch or two. Elsewhere, ground temps from early day warm advection will mostly likely keep snow accumulation near a dusting in the grass after sunset. After precipitation exits east the remainder of the night will be largely dry as drier air moves in.
SHORT TERM /6 AM SATURDAY MORNING THROUGH SUNDAY/... Scattered snow showers will once again develop in eastern Ohio later in the morning before expanding in coverage to the northeast during the afternoon as the upper low and cold air aloft moves overhead. With a shift in the wind from the west, orographic enhancement is likely for an extend period of time. Current expectations for snow accumulation through Sunday are near an inch in eastern Ohio/Pittsburgh metro, 1-2 inches north of I-80, and 5-8 inches (locally higher possible) in the ridges. Since accumulations will be over a relatively long time most places will remain below advisory criteria. The best shot at meeting advisory criteria will be in the ridges southeast of Pittsburgh tomorrow night into early Sunday morning, due strong vertical lift associated with the positioning of the upper- level low and a new wave of colder air (700mb temps on the NAM are displaying a drop in temps to -20C).
LONG TERM /SUNDAY NIGHT THROUGH FRIDAY/... Best chances for snow in the extended look to be Monday as an upper low transitions across the region and later Tuesday into Wednesday with a quick moving clipper. Daily high/lows are not forecast to stray far from normal.