Gibsonia, Pennsylvania Weather Forecast Discussion

141
FXUS61 KPBZ 291149
AFDPBZ
Area Forecast Discussion
National Weather Service Pittsburgh PA
749 AM EDT Mon Sep 29 2025
.SYNOPSIS...
Dry weather is expected through the week with high pressure in
control. Above normal temperatures will cool to more seasonable
values the second half of the week.
&&
.NEAR TERM /UNTIL 6 PM THIS EVENING/...
KEY MESSAGES:
- Dry weather continues
- Patchy fog early this morning
---------------------------------------------------------------
Some valley fog has developed this morning and quite evident on
nighttime microphysics satellite imagery. With little wind, it`s
mostly remaining confined to the valleys so aside from highly
localized visibility reductions, no major impacts expected.
Unlike Sunday, should see most of it dissipate shortly after
sunrise. Our 12z sounding shows a stout nocturnal inversion with
near 20C at 825 mb, so once we break the inversion expect
temperatures to climb quickly.
Another dry and unseasonably warm day is on tap as surface high
pressure remains in control. The only notable difference will
be an increase in cloud coverage from the southeast with
moisture extending north from Tropical Storm Imelda. Highs are
thus likely to be just a touch cooler than observed yesterday,
especially south and east of Pittsburgh where cloud cover
resides for more of the day.
Lows tonight should bottom out in the mid to upper 50s for
most, except north of I-80 where low 50s are forecast.
&&
.SHORT TERM /6 PM THIS EVENING THROUGH TUESDAY NIGHT/...
KEY MESSAGES:
- Dry and warm conditions continue
----------------------------------------------------------------
Any fog development is less likely overnight with increased
cloud coverage. Low temperatures will also be higher due to the
increase in clouds.
All ensembles continue to support ridging building over the
midwest to start of the week with a trend lately favoring
a stronger high which will maintain dry conditions and warmer
temperatures. Forecast cloud coverage has also decreased in the
period with the stronger high largely keeping any cloud coverage
from Humberto or Imelda to the east.
&&
.LONG TERM /WEDNESDAY THROUGH SUNDAY/...
KEY MESSAGES:
- Prevailing dry weather with temperatures trending closer to normal
  by mid to late week
-------------------------------------------------------------------
Temperatures are forecast to lessen to closer to normal (low/mid
70s) during the second half of the week. Models have been very
consistent for several days now in showing a broad ridge over
eastern CONUS during the period, so forecast confidence is
relatively high in a continued dry period across the region.
Temperatures will trend back up with height rises during the
weekend.
&&
.AVIATION /12Z MONDAY THROUGH FRIDAY/...
Satellite imagery and surface observations indicate fog has
developed in the river valleys this morning. This will continue
until mixing begins after sunrise. HLG and FKL are the most
prone airports to seeing IFR vsbys from this fog, but have also
seen brief vis reductions to all terminals besides PIT/ZZV, so
have left a TEMPO group in elsewhere for MVFR vis through 13z
when the fog should dissipate.
Otherwise, VFR is expected through the TAF period with BKN to
OVC cirrus increasing well to the north of the tropical low off
of the SE coast. Wind will be light and variable.
.OUTLOOK....
Outside of morning vly fog, VFR is expected through late week
under high pressure.
&&
.PBZ WATCHES/WARNINGS/ADVISORIES...
PA...None.
OH...None.
WV...None.
&&
$$
SYNOPSIS...88
NEAR TERM...MLB
SHORT TERM...88
LONG TERM...88
AVIATION...WM/MLB

NWS PBZ Office Area Forecast Discussion