Area Forecast Discussion
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000 FXUS61 KPBZ 270709 AFDPBZ Area Forecast Discussion National Weather Service Pittsburgh PA 309 AM EDT Sat May 27 2017 .SYNOPSIS... Areas of crossing low pressure will result in periodic shower chances through early Monday. && .NEAR TERM /UNTIL 6 PM THIS EVENING/... A crossing shortwave and a weakening MCS should maintain showers moving across the region through the morning. Elevated instability exits up to around the I 80 corridor, so maintained the isolated thunderstorm mention. Improvement is expected later today as shortwave ridging ensues in the wake of the night/morning rain. Areas S of I 70 could see isold/sct aftn showers/storms redevelop where a stalled sfc boundary is progged. SPC outlooks have areas S of the PA/WV border in a slight risk for severe storms, though warmth aloft and limited daytime heating should limit this potential. Better chances continue farther S of the boundary. Temperatures should average near or a few degrees above the seasonal levels. && .SHORT TERM /6 PM THIS EVENING THROUGH MONDAY NIGHT/... A shortwave crossing the upper Midwest and Great Lakes ahead of an approaching surface low is forecast to increase shower/thunderstorm chances again on Sunday. The low`s associated cold front should support further showers/storms into the night, with improvement on Monday as high pressure ridging rapidly slides across the area. Temperatures generally will remain just above the seasonal levels. && .LONG TERM /TUESDAY THROUGH FRIDAY/... Broad upper troughing is progged across the NE CONUS and Great Lakes region through the period. Shortwaves rotating through the trough will provide occasional shower chances through mid week until surface high pressure builds under the trough by late week. Temperatures should average near to a few degrees below seasonal levels. && .AVIATION /07Z SATURDAY THROUGH WEDNESDAY/... An area of showers with a few isolated storms will continue to cross the area and be east of DUJ by mid-morning. Thus far downstream locations have remained largely VFR during during showers...and would expect that to continue based on latest forecast soundings. .Outlook... Rain and restriction potential will return with Sunday low pressure. && .PBZ WATCHES/WARNINGS/ADVISORIES... MD...None. OH...None. PA...None. WV...None. && $$

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