Snow Squall Warning 2, NWS Pittsburgh, PA

Area Forecast Discussion
National Weather Service Pittsburgh PA
639 PM EST Fri Feb 18 2022

.SYNOPSIS...
Cold temperatures and light snow for Saturday. Warmer and drier
weather returns on Sunday.

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.NEAR TERM /UNTIL 6 AM SATURDAY MORNING/...
Minor changes for the evening update. PoPs were removed as drier air
has diminished the scattered snow showers and flurries. This drier
air has also rapidly decreased cloud cover. Cleared skies faster this
evening than previous forecast. Overnight temperatures were tweaked
with the latest hires model guidance.

Previous discussion...
Subsidence will prevail resulting in clearing sky for part of the
night, temperature will drop into the low 20s, close to the
climatological norm.

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.SHORT TERM /6 AM SATURDAY MORNING THROUGH MONDAY/...
On Saturday, a trough traversing the Great Lakes with vorticity
advection, and what looks to be a decaying cold front providing
ascent, will result in a chance for light snow. As the system begin
frontolysis, the best chance for snow showers will be near the I 80
corridor and the ridges, where ascent will then benefit from upslope.

With the frontal passage, gusty winds and light snow accumulation (a
quick half inch/inch) mainly near I 80 and a couple of inches
possible in the ridges are to be expected.

High pressure will build across the area by late Saturday. Warm
advection will commence overnight and through the day Sunday as sfc
high pressure shifts east. Sunday should be a beautiful day with
plenty of sunshine.

Dry weather and another pleasant day is expect on Monday as
southwest flow prevails.

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.LONG TERM /MONDAY NIGHT THROUGH FRIDAY/...
Model consensus depicts two subsequent low pressure systems moving
across the Upper Ohio Valley mid-week next week that should result in
precipitation chance.

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.AVIATION /00Z SATURDAY THROUGH WEDNESDAY/...
After remaining MVFR stratocu clears this evening, VFR is expected
most of the night as high pressure briefly builds in. Deterioration
to IFR in snow showers is expected toward sunrise as a cold front
approaches and crosses the region.

Snow should taper off after FROPA, though MVFR stratocu should
continue for part of the afternoon as and upper trough crosses the
region, and convective temperatures are reached. Increasing W wind
is expected late tonight and Saturday with a tightening pressure
gradient in the vicinity of the front, with gusts from 25-30kt.

.Outlook...
Restriction potential returns with low pressure Tuesday and
Wednesday.

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.PBZ WATCHES/WARNINGS/ADVISORIES...
PA...None.
OH...None.
WV...None.

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