Area Forecast Discussion
Issued by NWS -- Remove Highlighting --
-- Discussion containing changed information from previous version are highlighted. --
FXUS61 KPBZ 230919
Area Forecast Discussion
National Weather Service Pittsburgh PA
519 AM EDT Tue Aug 23 2016
High pressure will provide dry weather through mid week before
shower chances return with a late week cold front.
.NEAR TERM /UNTIL 6 PM THIS EVENING/...
-- Changed Discussion --Quick update to account for stratus development along the I80
corridor and Garrett county early this morning that is expected to
diminish by mid-morning. Otherwise no changes were needed early
this morning. The previous discussion follows.
High pressure will remain the dominant feature through the period
and maintain dry conditions with limited cloud coverage.
Relatively cool morning lows resulting from stronger radiational
cooling under clear skies and calm winds will recover quickly
with daytime highs expected to be slightly above normal. Fog is
less likely compared to recent mornings with an unfavorable
hydrolapse. Locations where temperatures fall to meet dewpoints
this morning will likely see dew rather than fog.
-- End Changed Discussion --
.SHORT TERM /6 PM THIS EVENING THROUGH FRIDAY/...
Ridging will continue to transition over the area through the
period with the ridge axis progged to be east of the forecast area
by Wednesday afternoon. Winds will then turn southwesterly and
result in increased moisture advection with cloud coverage
increasing later in the day. Overnight lows will be warmer as a
result. Rain chances will be on the rise Thursday as southwesterly
flow strengthens ahead of a weak cold front expected to cross the
area late Thursday night. Friday will largely be dry in the wake
of the front except for a slight chance of activity over the
higher terrain where increased convergence, residual low-level
moisture, and daytime heating may be enough to trigger a few
.LONG TERM /FRIDAY NIGHT THROUGH MONDAY/...
An upper level high will remain nearly stationary across the
southeastern United States through the period. The chance for
precipitation will be dependent on the timing of waves rotating
around the high. Both the GFS and ECMWF keep conditions dry
Saturday and Sunday, with the GFS bringing a wave through on
Monday while the ECMWF remains dry. As has been the general trend,
temperatures will be a few degrees above normal through the
.AVIATION /07Z TUESDAY THROUGH SATURDAY/...
Surface high pressure centered near KPIT will keep VFR conditions
through the TAF period. Calm winds and clear skies may allow for
patchy fog development along the river valleys before daybreak,
but confidence in restrictions at terminals is too low to include
.OUTLOOK /WEDNESDAY THROUGH SATURDAY/...
Restriction potential returns with the approach and passage of a
cold front Thursday and Friday.