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-- Discussion containing changed information from previous version are highlighted. --
000
FXUS61 KPBZ 120538
AFDPBZ

Area Forecast Discussion
National Weather Service Pittsburgh PA
138 AM EDT Wed Aug 12 2020

.SYNOPSIS...
Warm and humid weather will continue through much of the week, with
a daily chance for afternoon showers and thunderstorms mainly south
of Pittsburgh.

&&

.NEAR TERM /UNTIL 6 AM THIS MORNING/...
04Z sfc analysis shows the weak front stretched across southern
portions of the CWA early this morning, making slow progress to the
south before stalling along the Mason-Dixon. As skies continue to
clear, residual boundary layer moisture will allow for development of
patchy fog, especially across the river valleys. The overnight
forecast remains on track, and no further changes were needed. Lows
are expected to be around 5 degrees above average.

&&

.SHORT TERM /6 AM THIS MORNING THROUGH THURSDAY NIGHT/...
That stalled front is projected to meander over the Mid Atlantic region
through much of the week with persistent but weak shortwave troughing
aloft. As a result, daily, diurnally-supported convection is
expected fueled by moist low levels. Recent guidance has trended
farther south with placement of the frontal boundary, which should
shift greatest PoPs southwards and lower overall QPF totals across
the area.

Northern counties will also be under the growing influence of building
high pressure and drier air, which will further limit rain chance to
areas south and east of Pittsburgh.

Despite weak frontal passage today, seasonably warm temperature can
be expected for the period.

&&

.LONG TERM /FRIDAY THROUGH TUESDAY/...
Similar conditions are to continue this weekend with daily
diurnally-supported convection anticipated. More vigorous shortwave
support with an encroaching front is likely to spread the rain
chance more evenly across the area on these days. Seasonable warmth
can be expected through the weekend.

&&

.AVIATION /06Z WEDNESDAY THROUGH SUNDAY/...
-- Changed Discussion --
A weak cold front continues to crawl towards the Mason-Dixon Line
this morning. Drier air is lagging behind the boundary, and low-level
moisture will linger through the night. Thus, patchy MVFR/IFR fog is
expected overnight and near sunrise, especially in valley locations.
Any fog will lift by 13Z, with VFR conditions under scattered cumulus
expected for the remainder of the TAF period. Wind will remain light
throughout.

.Outlook...
Periodic restriction potential can be expected through Thu S of PIT,
and area wide Fri thru Sun, with a slow moving surface front.
-- End Changed Discussion --

&&

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

&&

$$