053 
fxus61 kpbz 181853 
afdpbz 


Area forecast discussion 
National Weather Service Pittsburgh PA 
253 PM EDT Friday Jul 18 2008 


Synopsis... 
warm and humid conditions will continue through the weekend. An 
approaching cold front will bring scattered thunderstorms 
beginning Sunday. 


&& 


Near term /through Saturday/... 
isolated thunderstorms still possible over the West 
Virginia/western Maryland mountains through early this evening and again 
late Saturday where covergence over the ridges can provide enough lift 
to overcome the capping inversion. Otherwise above normal temperatures 
and humid conditions will continue. 


&& 


Short term /Saturday night through Monday/... 
system approaching our region from the west will bring a greater 
chance of thunderstorms for Sunday and Monday. More abundant cloud 
cover should hold maximum temperatures in the lower and middle 80s. 


&& 


Long term /Monday night through Friday/... 
a broad upper trough of low pressure will allow disturbances to move 
through the flow during this period. Later model runs will help to 
pinpoint which days have the best chances for storms...currently 
favoring low chance for each day. Anticipating near seasonal 
temperatures. 


&& 


Aviation /18z Friday through Wednesday/... 
high pressure will remain dominant into Sunday...with a low pressure 
system moving in from the central Great Lakes region Sunday 
afternoon into Monday. Another low will affect the region for 
Tuesday night into Wednesday. This afternoons diurnally generated 
cumulus will dissipate after sunset...with patchy valley fog expected 
overnight. Visible in fog could be reduced to IFR at times toward 
morning. Saturday will be similar to today...with building 
afternoon cumulus...then clouds dissipate at night with valley fog 
overnight. IFR conditions in showers and storms will be possible 
Monday and Wednesday. 


&& 


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


&& 


$$