Area Forecast Discussion
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000 FXUS61 KPBZ 221436 AFDPBZ Area Forecast Discussion National Weather Service Pittsburgh PA 1036 AM EDT Mon May 22 2017 .SYNOPSIS...
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Drier conditions will return for today and tonight. They will be short- lived, however, as rain returns Tuesday with the approach of a storm system. overall it will be a cooler week and holiday weekend than we have be used to, with daily rain chances from mid week into Memorial Day.
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&& .NEAR TERM /UNTIL 6 PM THIS EVENING/...
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The last of the showers have vacated the mountains. Rapid clearing will take place midday across the region. Dewpoints have already fallen back into the 40s across eastern Ohio and that air is heading heading east. H8 temps fall slightly during the day, however with a high sun angle that should offset boundary layer cold advection allowing the mercury to reach 70 in most spots.
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&& .SHORT TERM /6 PM THIS EVENING THROUGH THURSDAY/... As this morning`s system continues eastward tonight, dry air looks to remain in control. A digging upper low will linger back toward the Mississippi Valley through mid-week. This will allow for a southern stream wave to trek up the east coast. However, the bulk of the moisture with this system will remain suppressed to our SE. The lone exception to this may be the ridges. PoPs were maintained here for showers but removed overall elsewhere as upper ridging looks to maintain sway over the area through at least Wednesday night. Temperatures during the period gradually warm through mid-week then cool thereafter once upper troughing comes into play by Thursday. Fries && .LONG TERM /THURSDAY NIGHT THROUGH SUNDAY/... The long wave trough will linger overhead into Thursday night before gradually pushing off toward New England through the weekend. Unstable lapse rates with cold mid-level temperatures will allow for decent rain chances to continue through late in the work week. Beyond then, northwesterly flow behind the upper level system combined with weaker waves in northwesterly flow will keeps this unsettled and cooler into next weekend. Fries && .AVIATION /15Z MONDAY THROUGH FRIDAY/...
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Improvement will happen quickly through late-morning as much drier air moves in. Southerly winds ahead of the front will shift quickly with the passage of the front. Surface flow will then generally stay west-northwesterly through the remainder of the TAF period. .Outlook... The next chance for widespread restrictions and precipitation is expected Wednesday night into Thursday.
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&& .PBZ WATCHES/WARNINGS/ADVISORIES... MD...None. OH...None. PA...None. WV...None. && $$

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