Area Forecast Discussion
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FXUS61 KPBZ 051958

Area Forecast Discussion
National Weather Service Pittsburgh PA
258 PM EST Mon Dec 5 2016

Low pressure is expected to spread precipitation across the
region Tuesday. A Thursday cold front will return snow shower
chances and much colder temperatures for the end of the week.


High pressure should maintain dry weather most of tonight. As the
high exits late tonight, a shortwave and associated weak surface
low is progged to track from the Mississippi Valley region,
reaching the Upper Ohio Valley region Tuesday. Deep layer
moisture, ascent and low level jet support should result in
widespread rain across much of the region.

With southeast upslope flow, cold air is expected to remain
across the higher terrain SE of PIT, where a winter weather
advisory has been issued to highlight a freezing rain threat. With
the low level jet, gusty winds are also expected in the higher
terrain. The cold temperatures should persist until the flow
veers to the southwest Tuesday evening, and precipitation exits.
Areas toward DUJ could also see a wintry mix with some light snow
or ice accumulation possible, though confidence in advisory level
precip in this area is lower. Included an HWO mention for this


The shortwave and precip are progged to exit Tuesday night as the
surface low weakens, and coastal development occurs. Ridging
should return dry weather for Wednesday. A cold front is progged
for a Thursday passage, with subsequent upper troughing progged
across much of the eastern CONUS. Maintained high chance to likely
snow shower pops for this scenario. The boundary layer flow should
remain WSW preventing any lake enhancement. Temperatures are
expected to be a few degrees below average Wednesday, with
readings 10 to 15 degrees below average for Thursday.


Upper troughing and cold W-WSW flow should persist across the
eastern CONUS through Friday maintaining snow shower chances. A
less amplified pattern is progged from the weekend through early
next week, with several crossing shortwaves progged. Maintained a
mention of chance pops from Saturday night through early next
week. Much below average temperatures are expected to moderate
with the less amplified pattern by early next week.


Building high pressure is expected to alleviate MVFR cigs this
afternoon and maintain VFR for the night. Condition deterioration
can be expected again on Tuesday as low pressure spreads precip
over the region.

A strong cold front will bring more restrictions by Thursday.


MD...Winter Weather Advisory from 4 AM to 10 PM EST Tuesday FOR
PA...Winter Weather Advisory from 4 AM to 10 PM EST Tuesday FOR
WV...Winter Weather Advisory from 4 AM to 10 PM EST Tuesday FOR



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