Area Forecast Discussion
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FXUS61 KPBZ 290058
AFDPBZ

Area Forecast Discussion
National Weather Service Pittsburgh PA
858 PM EDT Wed Jun 28 2017

.SYNOPSIS...
High pressure will maintain dry weather tonight. An approaching
front will return shower and thunderstorm chances to the area
late this week.

&&

.NEAR TERM /UNTIL 6 AM THURSDAY MORNING/...
Little change needed to the overnight forecast. High pressure
departing the Eastern Seaboard will allow for southwest flow,
with a warm advection pattern continuing. High clouds will
dominate overnight, with deeper moisture holding off until
Thursday. Low temperatures will be closer to climatology than
the previous couple of nights.

&&

.SHORT TERM /6 AM THURSDAY MORNING THROUGH FRIDAY NIGHT/...
Cloud coverage will increase Thursday morning in warm advection
ahead of an approaching shortwave progged to track north of the
forecast area. Overall, models have trended farther north with
this feature and continue to show marginal instability. Shower
and thunderstorm chances will increase mainly near and N of I
80 with locations to the south having a better chance at
remaining capped.

Friday will be similar but with greater total thunderstorm
coverage as surface dewpoints climb into the high 60s and
surface-based instability increases.

&&

.LONG TERM /SATURDAY THROUGH WEDNESDAY/...
The Midwestern upper trough is progged to advance E Saturday
driving a cold front across the area. Dry weather is expected to
return Sun/Mon as surface ridging builds underneath the upper
trough. Another trough is progged to advance E from the Midwest
and Plains regions Tue, though with uncertainty in timing and
location limited POPs to the chance category for now on the 4th
of July.

&&

.AVIATION /01Z THURSDAY THROUGH MONDAY/...
General VFR is forecast through the period. High clouds will
slowly lower with time, with mid clouds appearing ahead of an
approaching disturbance by morning. Isolated to scattered
showers and thunderstorms may appear mainly north of PIT after
18Z, but coverage and confidence preclude a specific mention at
this time. Winds will be southwest through tomorrow, with gusts
from 20 to 25 knots expected Thursday afternoon.

.OUTLOOK...
Restriction chances will increase Friday and Saturday with the
approach and passage of a cold front.

&&

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

&&

$$


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