Area Forecast Discussion
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000 FXUS61 KPBZ 070242 AFDPBZ Area Forecast Discussion National Weather Service Pittsburgh PA 942 PM EST Tue Dec 6 2016 .SYNOPSIS... A Thursday cold front will return snow shower chances and much colder temperatures for the end of the week and into the weekend. && .NEAR TERM /THROUGH WEDNESDAY/... 910pm update... Rain/freezing rain has ended. There will still be some areas of fog and drizzle through the evening until a wind shift moves through and begins to increase low level mixing. Having trouble finding any locations that are below freezing, so with this fact, and the loss of substantial precipitation, will be canceling all headlines. Will still leave in the mention of patchy freezing drizzle, but it will be very isolated. Temperatures have been updated with a blend of hires guidance. && .SHORT TERM /WEDNESDAY NIGHT THROUGH FRIDAY NIGHT/... Lingering low level moisture over the eastern zones may cause light precipitation early Wednesday. Otherwise, dry weather is forecast for as surface high pressure builds across the region briefly. The next cold front is still expected to cross on Thursday, bringing the coldest air of the season so far. Have increased PoPs for snow showers behind the front in the developing mid-level trough. Latest guidance shows favorable lake enhancement snow to develop mostly over the the north for a short period of time. After the initial onslaught of the cold front and blustery snow showers late Thursday, inversion heights will gradually lower and decrease the snow accumulation rate by late Friday. Nonetheless, stagnant low level moisture and lowering dendritic growth zone is expected to keep snow chances lasting through the start of the weekend, especially over the higher terrain. Temperatures will lower to below normal values by the end of the period and wind chill values are expected to decrease to near single digits. && .LONG TERM /SATURDAY THROUGH TUESDAY/... The cold-supporting upper trough over the Eastern CONUS is progged to fill rapidly early next week as another low develops toward the Great Lakes. Flow over the Upper Ohio will thus deamplify and temperature moderate back toward the seasonal averages. Best precip chances look to be on Sunday night and into Monday as that Great Lakes low drags a front across the region. With the low-center forecast well north of the region, precip timing will depend on eventual frontal progress. Superblend guidance was used for long term forecast construction. && .AVIATION /03Z WEDNESDAY THROUGH SUNDAY/...
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LIFR/IFR cig restrictions look likely to persist until winds shift to the west with improvement to low MVFR following. Building high pressure will then result in improvement to VFR possible by mid/late morning based on latest guidance. .OUTLOOK... Periodic restrictions are likely for the rest of the week as a strong cold front sweeps the region.
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&& .PBZ WATCHES/WARNINGS/ADVISORIES... MD...None. OH...None. PA...None. WV...None. && $$

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