Area Forecast Discussion
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000 FXUS61 KPBZ 211745 AFDPBZ Area Forecast Discussion National Weather Service Pittsburgh PA 145 PM EDT Tue Mar 21 2017 .SYNOPSIS...
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A strong cold front will sweep through tonight, bringing much colder temperatures on Wednesday.
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&& .NEAR TERM /THROUGH TONIGHT/... Lingering morning light rain in the ridges will erode ahead of a cold-frontal surge oozing swd across the region this morning. Brief clearing ahead of this boundary will give way to broken clouds this afternoon as lapse rates steepen in the wake of the front. No changes appear needed to temperatures today. && .SHORT TERM /WEDNESDAY THROUGH THURSDAY/... A second, and stronger front, will cross the area tonight. A lack of moisture and upper-level support will allow for its passage to be mainly dry. However, much colder air will quickly filter in behind the surface boundary. This will provide an increase in low clouds for a large portion of the area overnight and push surface temperatures to 5 to 10 degrees below normal by Wednesday morning. Do not expect much widespread snow-shower activity in the cold-air advection late tonight/Wednesday morning, but scattered snow showers in the I-80 corridor are possible, with very-low probabilities of a snow shower in the higher elevations once the heart of the cold air reaches the ridges. But winds aloft are not lined up for much lake/upslope influence, and inversions quickly decrease as a very-dry air mass aloft quickly spreads across the region. Wednesday will be rather chilly, with reading close to 20 degrees below normal, but this impact will be somewhat offset by a warm late March sun. Any morning stratocu will quickly dissipate. Thursday looks to be very nice with lots of sunshine and moderating temperatures. Upper-level heights will rise quickly Thursday with a strong ridge moving across the Midwest, and the cold air aloft ejecting toward the northeast. Highs Thursday will climb closer to seasonal levels. && .LONG TERM /THURSDAY NIGHT THROUGH MONDAY/... Moisture is progged to increase in response of an upper low stationed over the southern plains. This feature will slowly shift towards the Great Lakes and increasing rain chances with a warm front on Friday followed by the approaching cold front over the weekend. && .AVIATION /18Z TUESDAY THROUGH SUNDAY/...
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Diurnal low-VFR cumulus will dissipate shortly before sunset. Gusty northwest winds will develop this evening behind a crossing front, with an additional round of low-VFR clouds. Cannot rule out the possibility of some MVFR cigs at FKL/DUJ. Clouds should dissipate late Wednesday morning along with wind gusts diminishing. Outlook... The next chance for widespread restrictions should come on Friday with a front tracking across the lower Great Lakes.
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&& .PBZ WATCHES/WARNINGS/ADVISORIES... MD...None. OH...None. PA...None. WV...None. && $$ is the U.S. government's official web portal to all federal, state and local government web resources and services.