Area Forecast Discussion
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873
FXUS61 KPBZ 240708
AFDPBZ

Area Forecast Discussion
National Weather Service Pittsburgh PA
308 AM EDT Thu Aug 24 2017

.SYNOPSIS...
A reinforcing cold front is expected to generate some showers
today. Weekend weather will feature cool and dry conditions
with high pressure.

&&

.NEAR TERM /UNTIL 6 PM THIS EVENING/...
A wave currently over northern Wisconsin is set to beeline
toward the area by this afternoon. Rapid cooling in the mid
levels combined with diurnal heating should allow for shower
development as the mid-level trough swings across the area.
Scattered showers have been maintained in the forecast with
generally well below normal temperatures.

Before the arrival of this wave, skies will gradually increase
in cloud cover as the boundary layer warms and mid-levels cool.
However, as we start with an abundance of clearing, especially
southeast of Pittsburgh, and precipitation coverage with the
system itself will not be particularly expansive, it certainly
does not look like a full cloudy washout. Fries

&&

.SHORT TERM /6 PM THIS EVENING THROUGH SUNDAY/...
A broad upper trough in the ern CONUS will dominate the wx
pattern through much of the remaining forecast as an upper ridge
amplifies in the central CONUS.

Surface high pressure under northwest flow aloft will maintain
dry and cool condition for the Upper Ohio Region through the
weekend.

&&

.LONG TERM /SUNDAY NIGHT THROUGH WEDNESDAY/...
Generally northwesterly flow aloft will gradually be replaced by
more zonal flow early in the week and then deeper southwesterly
flow. This will allow for moisture to start to encroach
northward from the moisture laden Gulf coast and lower
Mississippi Valley after Harvey`s encroachment. Model solutions
are not in unison in terms of the extent of northward spread nor
how far eastward the moisture advects, however. Thus, PoPs,
while trended upward decidedly into midweek, were not increased
beyond high chance. Fries

&&

.AVIATION /07Z THURSDAY THROUGH MONDAY/...
Other than localized early morning river valley fog, VFR
conditions are expected through the TAF period. A CU/SC ceiling
is expected to develop by mid morning with surface heating and
cool air aloft. An upper trough could also result in isolated to
scattered showers this afternoon. Included a VCSH mention for
most ports. Clouds should scatter out tonight as the trough
exits.

.Outlook...
No widespread restrictions expected under high pressure.

&&

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

&&

$$



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