Area Forecast Discussion
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000 FXUS61 KPBZ 140913 AFDPBZ Area Forecast Discussion National Weather Service Pittsburgh PA 413 AM EST Thu Dec 14 2017 .SYNOPSIS... Rapidly moving low pressure will continue the snow overnight. Snow will end across much of the region around dawn save some lingering snow showers over the ridges. Cloudy and cold for the rest of the day. && .NEAR TERM /UNTIL 6 PM THIS EVENING/... Low will quickly transition to the coast this morning. As this occurs, the strong upper level support and deep moisture will also rapidly shift to the eastern seaboard. This will bring a quick end to the bulk of the snow with the exception of the ridges and perhaps the I-80 corridor, as much colder air rushes southward behind the exiting system. Winds behind the system will turn to the northwest, allowing for lake influence and upslope to commence. However, inversions rapidly drop this morning, which will push most of the saturated level below the dendritic growth zone. This will greatly hinder the development of lake bands and also will cutoff the ridge snow by mid to late morning. PoPs transition downward after dawn, and will end by late morning in the north and east. Plenty of clouds remain today in the strong cold air advection and temperatures will be well below normal. && .SHORT TERM /6 PM THIS EVENING THROUGH 6 PM FRIDAY/... Clouds will linger overnight. Weak shortwave trough will approach the area late Friday, returning the risk for snow showers. Temperatures remain well below normal on Friday. && .LONG TERM /FRIDAY NIGHT THROUGH WEDNESDAY/... Trough will quickly swing through Friday night and snow showers will linger into Saturday. Slow height rises aloft begin Saturday afternoon, bringing and end to the snow shower activity and allowing for warmer air to overspread the region. Flow goes zonal over our area by Sunday as our trough lifts out and energy digs into the southwest U.S. This will result in continued temperature moderation towards more seasonal levels. The next system arrives on Sunday and will be mainly a rain producer from the southern branch of the jet stream. The pattern could remain unsettle thereafter with weak waves in the west- southwest flow aloft, with perhaps another cool down by the middle of next week. && .AVIATION /09Z THURSDAY THROUGH MONDAY/... Widespread IFR/MVFR snow will be decreasing in coverage this morning as surface low moves rapidly toward the east coast. Conditions will improve this morning from west to east, although MVFR stratocu will persist through the remainder of the forecast period, as cold northwest flow upslopes off the lakes. .Outlook... Next chance for restrictions is late Friday into Saturday. && .PBZ WATCHES/WARNINGS/ADVISORIES... MD...Winter Weather Advisory until 10 AM EST this morning for MDZ001. OH...Winter Weather Advisory until 7 AM EST this morning for OHZ039>041-049-050. PA...Winter Weather Advisory until 7 AM EST this morning for PAZ007>009-013>016-020>023-029-031-073>075. Winter Weather Advisory until 10 AM EST this morning for PAZ076. WV...Winter Weather Advisory until 7 AM EST this morning for WVZ001>003-509-510. Winter Weather Advisory until 10 AM EST this morning for WVZ511>514. && $$

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