420 
FXUS61 KPBZ 091524
AFDPBZ

Area Forecast Discussion
National Weather Service Pittsburgh PA
1024 AM EST Wed Dec 9 2020

.SYNOPSIS...
Light precipitation with no accumulation north and northeast of 
Pittsburgh will be followed by dry conditions and a warming trend 
through the end of the work week.

&&

.NEAR TERM /THROUGH TONIGHT/...
Very light and patchy precipitation will be possible mainly north 
and east of Pittsburgh today with a crossing shortwave trough. No 
snow accumulation is expected. This afternoon any precipitation 
should transition to light drizzle from northwest to southeast as 
drier air moves in at mid/upper levels (eliminating any "seeds" in a 
seeder/feeder situation) and the saturated BL is too warm -5C at it's
coldest across the forecast area) for to support snow. These cloud
top temperatures are currently being observed upstream.  Overnight 
patchy precipitation will gradually diminish as inversions lower 
under increasing subsidence. Included the mention of freezing drizzle
north of I-80 overnight where drizzle would still be possible and 
sfc temperatures drop below freezing. Do not anticipate any issues as
precipitation should be very spotty. 

Fog will be possible overnight over eastern Ohio with a clearing sky
and favorable hydrolapse.

&&

.SHORT TERM /THURSDAY THROUGH FRIDAY NIGHT/...
Ridging will result in dry conditions Thursday and Friday with
temperatures warming to around 10 degrees above normal by Friday.

&&

.LONG TERM /SATURDAY THROUGH TUESDAY/...
Rain chances increase on Saturday as the next low pressure system
tracks northeast out of the midwest. Latest model consensus shows 
the best chance for precipitation overnight Saturday and Sunday 
morning with the passage of the associated cold front. Precipitation 
chances continue into Monday morning with a changeover to snow with 
the passage of the upper trough...lingering into Tuesday along the 
I-80 corridor and in the ridges under cold northwesterly flow aloft.

&&

.AVIATION /15Z WEDNESDAY THROUGH SUNDAY/...
Widespread MVFR cigs are expected today as a shortwave trough
approaches and crosses the region. Patchy light snow is also 
expected, mainly for DUJ and FKL, by mid morning thru aftn with the
crossing trough. A sufficient pres gradient and mixing should 
support SW-WSW wind gusts to 20 kt thru the aftn.

MVFR cigs should continue tonight for most ports with llvl moisture 
locked below a subsidence inversion.

.Outlook...
Cigs should erode Thu under bldg high pres. Restrictions are likely
again with weekend low pres.

&&

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

&&

$$