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NWS Area Weather Forecast Discussion
County Warning Area [CWA]: PBZ
Regional NWS Weather Office: Pittsburgh, PA

FXUS61 KPBZ 211508

Area Forecast Discussion
National Weather Service Pittsburgh PA
1008 AM EST Tue Nov 21 2017

A cold front will bring the next chance for precipitation
tonight. Dry weather and below average temperature are expected
for the remainder of the week.


Temperatures are off to a roaring start this morning as a very
dry column has allowed for insolation to maximize early, which
has in turn allowed for vertical mixing to increase earlier than
normal. This has quickly pushed temperatures up well above
normal. With a leading wave aloft passing at the moment, the few
high clouds it is generating should move east fairly quickly
later this morning, resulting it full sunshine through the
afternoon. This will allow for further warming on gusty
southwest winds. As a result, high temperatures have been
pumped upward fairly substantially for the afternoon.

Speaking of the southwest wind, model soundings suggest 35-40
kts off the deck through the early afternoon below the inversion
level. While full dry adiabatic mixing is not really supported,
a good deal of that momentum should be capable of mixing
downward, thus wind gusts were increased into the range of 30
kts through the afternoon, with the highest values expected to
the north and in the ridges. Fries


Cold front will quickly swing through the area this evening and
into the overnight hours. Model are showing sufficient upper
level support and low-level forcing to continue with likely
POPs, mainly over the northern half of the region. The cold
airmass behind the front does not look deep enough to sustain a
very long period of post frontal snow showers. Forecast
soundings are showing saturation levels dropping quickly, well
below the dendritic snow growth layer. Minor snow accumulations
are possible, but should be limited mainly to the I 80 corridor
and ridges. Less than an inch is anticipated in those areas.

High pressure will then ensure a dry midweek and Thanksgiving
holiday, with sub average temperatures.


Ensemble forecasts are showing the next cold front dropping
through the area on Saturday, followed by the next trough
setting up over the Eastern CONUS, which will hold into the
beginning of next week. Cold surface high is expected to build
back in late Sunday into Monday.


VFR through much of the day with restrictions at FKL and DUJ
late tonight as a front quickly crosses. Winds will increase
ahead of the front as the pressure gradient increases with wind
gusts around 20 kts.

Subsequent cold advection is expected to maintain MVFR cigs
into Wednesday, but improvement can be expected as the day
progresses. The next chance for restrictions is forecast with an
early Saturday cold front.





Forecast Discussion from: NOAA-NWS Script developed by: El Dorado Weather