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

000
FXUS61 KPBZ 211248
AFDPBZ

Area Forecast Discussion
National Weather Service Pittsburgh PA
748 AM EST Tue Jan 21 2020

.SYNOPSIS...
After scattered flurries this morning, dry weather is expected
through Thursday under building high pressure. Precipitation chances
return Friday through the weekend with crossing low pressure.

&&

.NEAR TERM /UNTIL 6 PM THIS EVENING/...
Mid-morning update: Minor adjustments were made to temperature based
on surface observations. Previous discussion follows...

Areas of stratocu and flurries should continue this morning with
moisture below a temperature inversion, and cold nrly flow off the
lakes. The clouds and flurries are expected to slowly erode later
today as subsidence increases under building high pressure. Highs are
expected to be around 5 degrees below seasonable levels.

&&

.SHORT TERM /6 PM THIS EVENING THROUGH THURSDAY NIGHT/...
Ridging should maintain dry weather as it moves east across the
region through the period. A gradual warming trend is also expected,
with temperatures above average by Thursday with SW flow aloft as
the ridge axis shifts east of the area.

&&

.LONG TERM /FRIDAY THROUGH MONDAY/...
An upper low is progged to track E from the Upper Midwest, reaching
the Upper OH Valley region Friday night and Saturday. Rain and snow
chances should increase with the approach and passage of the low.
Snow chances should continue Sunday as the upper low tracks to the E
Coast, and a shortwave trough rotates around it. Another trough in NW
flow aloft should maintain slight to low precip chances Monday.
Temperatures are expected to average near or a few degrees above
seasonable levels.

&&

.AVIATION /13Z TUESDAY THROUGH SATURDAY/...
Relative moisture under a fairly shallow inversion will support MVFR
stratocu and flurries through this morning in cold airmass over the
region. Slightly backing flow to the nw in response to an upstream
shortwave is likely to maintain that support until increasing
subsidence suppresses the potential by aftn. Expect VFR and light
wind thereafter.

.Outlook...
Restrictions are likely again by Fri with the approach of low
pressure.

&&

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

&&

$$

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