Area Forecast Discussion
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334 FXUS61 KPBZ 221057 AFDPBZ Area Forecast Discussion National Weather Service Pittsburgh PA 557 AM EST Wed Nov 22 2017 .SYNOPSIS... Scattered snow and rain showers will be ending this morning and much colder air will overspread the region. Dry weather can then be expected until the approach of the next front on Saturday. && .NEAR TERM /UNTIL 6 PM THIS EVENING/... Good shot of cold air will overspread the region today. Any lingering rain or snow showers will rapidly head eastward, and the snow showers would likely be confined to the I-80 corridor and the ridges. Forecast soundings are showing inversion levels dropping quickly in the cold air, putting the saturated layer below the dendritic growth zone. Snow showers to the north would be driven by the possibility of lake enhanced bands developing and snow showers over the highest ridges would be orographically influenced. With strong cold air advection today and a stratocu cloud deck, temperatures will be well below normal. && .SHORT TERM /6 PM THIS EVENING THROUGH FRIDAY/... Surface high pressure under broad upper troughing will ensure a dry, but cool conditions through the end of the week. && .LONG TERM /FRIDAY NIGHT THROUGH TUESDAY/... Ensemble forecasts are showing the next cold front dropping through the area on Saturday with fairly weak support for precipitation, followed by the next trough setting up over the Eastern CONUS. Cold weather is thus projected to start the new week. && .AVIATION /12Z WEDNESDAY THROUGH SUNDAY/...
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Passing cold front will be east of the ridges by mid- morning. Cold advection on nw wind in the wake of the front will maintain high MVFR low VFR cigs through most of the day. .Outlook... The next chance for restrictions is forecast with a Saturday cold front.
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&& .PBZ WATCHES/WARNINGS/ADVISORIES... MD...None. OH...None. PA...None. WV...None. && $$

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