141 
fxus61 kpbz 052136 aaa 
afdpbz 


Area forecast discussion...updated 
National Weather Service Pittsburgh PA 
536 PM EDT Sat Jul 5 2008 


Synopsis... 
a weak area of low pressure aloft will bring a chance of afternoon 
and evening showers and thunderstorms mainly along the higher 
elevations east of Pittsburgh through Sunday. A dry and warmer day 
for Monday will give way to a chance of showers and storms Tuesday 
as a front approaches. 


&& 


Near term /through Sunday/... 
have updated to remove all mention of pcp except for southeast ridges. 
Also lowered cloud cover as skies clearing as sun angle lowers. 


Weak upper low over the Ohio Valley will slowly open and edge 
east through Monday. Scattered showers and storms on front side of 
this low this evening and again Sunday afternoon mainly south and 
east of Pittsburgh. Low begins to lift out with heights rising for 
a warmer day Sunday. 


&& 


Short term /Sunday night through Tuesday/... 
leftover diurnal showers Sunday evening otherwise dry weather 
expected through Monday. Southwest flow at the surface and rising 
heights aloft will push temperatures above normal with humid 
conditions. Front will approach form Great Lakes during Tuesday 
with scattered showers and storms especially in the afternoon. 


&& 


Long term /Tuesday night through Saturday/... 
cold front drops into southern Great Lakes Tuesday night and across 
County Warning Area on Wednesday with chance of thunderstorms late Tuesday night in 
northern zones and across entire County Warning Area Wednesday. Surface high pressure 
builds into region on on Thursday with partly cloudy skies and at or 
slightly below normal temperatures. Upper level ridge begins to 
build into eastern United States on Friday and remains in place 
through the weekend bringing partly to mostly sunny skies...above 
normal temperatures and increasing humidity. 


&& 


Aviation /22z Saturday through Thursday/... 
isolated thunderstorms possible in northern WV until 00z. Scattered to broken 030-050 
through 00z with unrestricted visibility. VFR ceilings and visibility 
through 06z with MVFR visibilities developing after 06z. Expect 
IFR visibility around sunrise at terminals affected by valley 
fog...agc... hlg...lbe...zzv. Front remains stalled to southeast 
of County Warning Area Sunday with possibly of afternoon thunderstorms vicinity of ridges 
as upper trough swings east. High pressure builds over Ohio River 
valley Monday and Tuesday with general VFR conds outside of patchy 
morning fog. 


Cold front drops through the Great Lakes Tuesday night and across 
County Warning Area on Wednesday with chance of thunderstorms. High pressure builds 
into area Thursday with clearing skies and morning fog. 


&& 


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


&& 


$$