375 
FXUS61 KPBZ 060921
AFDPBZ

Area Forecast Discussion
National Weather Service Pittsburgh PA
521 AM EDT Mon Sep 6 2021

.SYNOPSIS...
Mainly dry weather and seasonable temperatures are expected through 
Tuesday under building high pressure. Shower chances return Tuesday 
night and Wednesday with a crossing cold front.

&&

.NEAR TERM /UNTIL 6 PM THIS EVENING/...
Patchy fog should quickly mix out and dissipate this morning.
A shortwave trough is expected to cross the Lower Great Lakes/Upper 
Ohio Valley region this morning. Most of the shower supporting ascent
and moisture is expected to stay north of the forecast area, though 
some scattered showers are possible this morning N of Interstate 80. 

Otherwise, sfc high pressure is progged to begin to build across the
region later today, with dry weather expected. High temperatures 
should average near seasonable levels.

&&

.SHORT TERM /6 PM THIS EVENING THROUGH WEDNESDAY NIGHT/...
Sfc high pressure is expected to move east across the region,
maintaining dry weather through Tuesday. Some patchy river valley fog
is possible tonight with warm water temperatures in place. A 
deepening upper trough is progged to track E from the Upper Midwest 
Tuesday night and Wednesday, as an associated sfc cold front 
approaches the area. Shower coverage should increase with this 
system's approach, and a few thunderstorms are possible Wednesday as 
the sfc cold front crosses the region.

The showers should diminish Wednesday evening as the cold front
completes its passage.

&&

.LONG TERM /THURSDAY THROUGH SUNDAY/...
The deepening upper trough axis should cross the Lower Great
Lakes/Upper Ohio Valley region Thursday, with isolated showers
possible. Areas N of I 80 should see more available moisture and
ascent for scattered showers, and even a few thunderstorms with
steepening lapse rates aloft. 

Generally dry weather is then expected through the weekend as sfc
high pressure builds under northwest flow aloft. Below average
temperatures late in the week should return to or above seasonable
levels through the weekend.

&&

.AVIATION /09Z MONDAY THROUGH FRIDAY/...
Patchy river vly fg should quickly dissipate/mix out this morning
after sunrise. A few shra are possible at FKL and DUJ this morning as
a shortwave trough crosses the region, otherwise VFR is expected
through the TAF period as sfc high pressure gradually builds in.
Gusty W wind is expected this aftn with a sufficient pressure
gradient and mixing. 

.Outlook...
Restrictions are psbl with a Tue night/Wed cdfnt. 

&&

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

&&

$$