Area Forecast Discussion
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FXUS61 KPBZ 250512
AFDPBZ

Area Forecast Discussion
National Weather Service Pittsburgh PA
1212 AM EST Sat Nov 25 2017

.SYNOPSIS...
Shower chances return today with the passage of a cold front.
Rain and snow showers are possible tonight with a trough of low
pressure before high pressure returns dry weather Sunday.

&&

.NEAR TERM /THROUGH TODAY/...
Clouds should continue to increase overnight ahead of an
approaching cold front. Weak upper support and a lack of
moisture should preclude precip with it`s passage this morning.
Scattered showers are expected this afternoon as an upper trough
approaches the Great Lakes and Ohio Valley region. Steady or
slowly rising temperatures are expected overnight with cloud
cover and warm advection, with near average highs today.

&&

.SHORT TERM /TONIGHT THROUGH SUNDAY NIGHT/...
Upper-level trough swings through Saturday evening, injecting
slightly deeper moisture and bringing cooler mid-level air. This
should help to re-invigorate shower activity, at least for a
few hours. Highest PoPs will be maintained north of I-80 and in
the higher elevations. Sometime around midnight, cooling aloft
should reach the point where rain can transition to snow. Not
expected much more than a coating for most locations north of
I-80 and in the Ridges, but a few locations could see up to a
half an inch. Low clouds may hang around well into Sunday,
especially north of Pittsburgh, but the inversion heights will
have dropped to the point where shower activity will no longer
be supported.

A weak surface trough should result in some cloud increase
Sunday night mainly north of Pittsburgh, though precip is not
expected. After near to above average temperatures tonight and
Saturday, a return to temperatures below seasonal levels is
expected Sunday.

&&

.LONG TERM /MONDAY THROUGH FRIDAY/...
Generally dry weather is expected through early in the week
with a de-amplified flow aloft. A weak trough is progged for a
Tue night/Wed passage, with mainly just an increase in clouds.
Another trough could result in better precip chances by late
week. Temperatures are expected to average near to several
degrees above seasonal levels.

&&

.AVIATION /05Z SATURDAY THROUGH WEDNESDAY/...
A low level jet ahead of the approaching front will mar VFR
conditions this morning. Condition deterioration to MVFR can be
expected with the encroachment of that front as Saturday
progresses. Precipitation is expected to remain scattered
though.

.Outlook...
Restriction potential will continue through early Sunday as
cold northwest flow spawns MVFR stratocu and scattered showers.

&&

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

&&

$$


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