Scientific Forecaster Discussion
Area forecast discussion
National Weather Service Pittsburgh PA
332 am EDT Wednesday Sep 3 2014
high pressure will build in for the rest of the week.
Near term /until 6 PM this evening/...
patchy fog will continue this morning with low level moisture in place...otherwise
high pressure will gradually build in today with exiting cs and dry weather expd.
Temperatures should be a few degree above the seasonal average.
Short term /6 PM this evening through Saturday/...
high pressure centered off the East Coast will continue to bring dry weather into
Friday. A cold front will advance across the Great Lakes and upper Ohio Valley region lt Friday
night into Sat with increasing chances for showers and thunderstorms. The upper flow is
prognosticated to become nearly parallel to the fnt which will allow for a slow
progression. Much above average temperatures will rtn to near seasonal levels by Sat.
Long term /Saturday night through Tuesday/...
initially cool temperatures are forecast to moderate rapidly back
toward...and possibly above the avgs by the middle of next week as an
eastern Continental U.S. Ridge amplifies in response to deep western North American
trofg as per GFS and European model (ecmwf) trends.
Generally dry conditions are prognosticated until that trough develops sufficiently
eastward by Wednesday.
Aviation /07z Wednesday through Sunday/...
light surface wind...weak subsidence...and a moist boundary layer will sprt fog
development during the predawn hours with the btr chance for IFR north and west of
pit where cs has thinned. VFR is anticipated for all ports by middle
Outlook.../Wednesday night through Sunday/...
a cold front is likely to spawn restrictions late Friday and Saturday.