Area Forecast Discussion
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712 FXUS61 KPBZ 170827 CCA AFDPBZ Area Forecast Discussion...CORRECTED National Weather Service Pittsburgh PA 327 AM EST Fri Nov 17 2017 .SYNOPSIS... Dry weather is expected today with high pressure. Rain can be expected Saturday with crossing low pressure and a cold front. Gusty winds and a few snow showers are expected behind the front Sunday. && .NEAR TERM /UNTIL 6 PM THIS EVENING/... Stratocu should gradually erode later today as high pressure builds overhead, though mid/high clouds should increase in warm advection ahead of the next approaching shortwave. Highs should be around 5 degrees below average. && .SHORT TERM /6 PM THIS EVENING THROUGH SUNDAY NIGHT/...
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Clouds should continue to increase tonight as low pressure tracks from the Plains to the Upper Midwest/Great Lakes area. Rain should overspread the region overnight and Saturday morning as the low`s warm front tracks N. Periods of rain are expected to continue Saturday as a series of shortwaves in SW flow ahead of an approaching upper trough cross the area. Strong winds just above the surface are progged over the area Saturday, though model soundings continue to indicate a capping inversion aloft, keep these winds from reaching the ground. The low is progged to track to Southern Ontario Saturday evening, dragging a cold front across the area. Showers are expected with FROPA. Steepening lapse rates with cold advection, and strong winds aloft should result in wind gusts of 30-40 mph behind the front Saturday night. Higher gusts are possible in the PA/WV/MD ridges. Snow showers are expected by Sunday morning as the main upper trough crosses the Lower Great Lakes/Upper OH Valley region. Maintained the highest POPs for areas near and N of I 80 and in the PA/WV/MD ridges where lake/terrain enhancement is expected. Generally forecasting a couple of inches of snow in these favored areas. A limiting factor in the upslope snow could be a lack of saturation in the snow growth region on model soundings. Snow is still likely, though rates could be limited by this factor. Another shortwave rotating through the main trough should maintain scattered to numerous snow showers Sun afternoon and early evening. Winds and precip should diminish Sunday night with building high pressure and backing winds.
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&& .LONG TERM /MONDAY THROUGH THURSDAY/... Dry weather is expected early in the week under ridging. A weak trough could return precip chances by mid week for areas N of PIT. Surface high pressure is progged to build under broad, weak upper troughing for the rest of the week, resulting in dry and cool weather. && .AVIATION /08Z FRIDAY THROUGH TUESDAY/... Low VFR / high MVFR ceilings overnight as moisture remains trapped under a subsidence inversion. VFR expected by mid morning at all sites as high pressure crosses the region. .Outlook... Restrictions are likely with a Sat cold front and with Sun upper troughing and cold NW flow. && .PBZ WATCHES/WARNINGS/ADVISORIES... MD...None. OH...None. PA...None. WV...None. && $$

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