Area Forecast Discussion
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FXUS61 KPBZ 240501

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

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


A few lingering cumulus clouds are currently departing the area
with little upstream cloud cover between our area and the next
wave to move through this afternoon. This combined with the fact
that model RH profiles indicate a dearth of moisture in the
vertical should lead to a mostly clear remainder of the night
and start to Thursday.

A wave currently over northern Minnesota is set to beeline
toward the area by Thursday 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. Fries


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


A high-confidence wx pattern is predicted through early next
week, as surface high pressure builds swd from the Great Lakes
amid an amplifying ridge in the central CONUS. The Ohio Valley
will lie between this ridge and the persistent upper trough on
the east coast. The resultant nly flow will maintain temperature
below seasonal average into the middle of next week.

By next Tuesday, moisture streaming from the Gulf in association
with tropical system Harvey may provide a canopy of high clouds
and an increasing chance of light rain.


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

No widespread restrictions expected under high pressure.




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