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Area forecast discussion 
National Weather Service Pittsburgh PA
622 am EDT Wednesday Jul 29 2015

Synopsis...
warm and muggy today...then less humid later tomorrow into late
week behind a cold front.

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Near term /until 6 PM this evening/...
minor tweaks for the dawn update based on satellite and near term
model data. Previous...continued on the humid side today with dew
points mainly in the 60s. As the day progresses heights aloft will
begin to fall as approaching shortwave begins to flatten upper
level ridge. Highs still near 90 most locations. By late today
approaching front and upper level trough may be able to probability of precipitation a
shower or thunderstorm across eastern Ohio and northwest PA...with slight
chance probability of precipitation.

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Short term /6 PM this evening through Saturday/...
cold front will pass over the region tonight...with continued
chance probability of precipitation. Overnight timing and a fairly capped atmosphere will
keep only chance probability of precipitation in the forecast with frontal passage. Lower dew
points will begin to work into the region during the day Thursday
as scattered showers and storms diminish northwest to southeast.

As upper level trough develops into the eastern states northwest
flow aloft will keep lower dew points with near seasonal
temperatures into late week. Added low chance probability of precipitation for Saturday
as models look to bring a shortwave in northwest flow and a
reinforcing cold front.

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Long term /Saturday night through Tuesday/...
surface ridging is prognosticated to continue under broad eastern Continental U.S.
Upper troughing...bringing mainly dry and seasonally warm weather
into the early part of the week. Precipitation chances are expected to
return Tuesday into middle week with crossing shortwaves. Followed
close to wpc ensemble based guidance...which smooths out some early
week operational model differences.

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Aviation /10z Wednesday through Sunday/...
other than patchy MVFR/isolated IFR fog early this morning...VFR
conditions with diurnal cumulus are expected today as surface riding
slides east.

An advancing cold front should bring increasing shower and
thunderstorm chances to ports west of the PA border by this
evening...so included a thunderstorms in the vicinity mention at zzv. How long precipitation
continues along the front is in question as it moves into PA later
in the evening...so only included a vcsh mention for the rest of
the taf sites.

Outlook...Thursday through Sunday...
restrictions are possible with a Saturday cold front.

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Pbz watches/warnings/advisories...
Maryland...none.
Ohio...none.
PA...none.
WV...none.

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