Area Forecast Discussion
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420
FXUS61 KPBZ 250730
AFDPBZ

Area Forecast Discussion
National Weather Service Pittsburgh PA
330 AM EDT Sun Jun 25 2017

.SYNOPSIS...
Upper low pressure will maintain cooler temperature and a periodic
shower chance for the first half of the week.

&&

.NEAR TERM /THROUGH TODAY/...
Another, albeit deeper shortwave is projected across the Great
Lakes this afternoon. Improved lapse rates and falling convective
thresholds under cooling mid levels may be sufficient to
support some isolated showers, but the probability will be
inhibited by limited moisture. A precip mention was thus
confined to the I 80 corridor where proximity to the mid level
disturbance/cold pool will have greater affect.

Cold advection should keep highs 5 to 10 degrees under the
averages.

&&

.SHORT TERM /TONIGHT THROUGH TUESDAY/...
A series of shortwaves are projected to cross the region during
the short term period. Improved dynamics and an improved, but
still limited moisture tap support better precip probability for
the period. Temperatures under the persistent troughing remain
progged about 10 degrees under the averages.

&&

.LONG TERM /TUESDAY NIGHT THROUGH SATURDAY/...
The long term period will feature moderating temperature as flow
aloft flattens/ridges in response to a trough digging out of
Western Canada. Humidity and warmth will enhance with the progress
of that trough over the Plains/Midwest, and precip chances
escalate as the system erodes the Eastern ridge by the weekend.

&&

.AVIATION /06Z SUNDAY THROUGH THURSDAY/...
VFR conditions will continue through the period despite a broad
upper-level trough. Diurnal cumulus will return again today,
along with scattered showers, primarily north of Pittsburgh.
Winds will generally remain westerly increasing to near 10kts
during the day, with gusts 15-20kts.

.OUTLOOK...
Chance for restrictions will come with afternoon convection on
Monday as an upper trough axis moves through the region.

&&

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

&&

$$



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