136 
fxus61 krlx 081857 
afdrlx 


Area forecast discussion 
National Weather Service Charleston WV 
244 PM EDT Friday Aug 8 2008 


Synopsis... 
high pressure and lower humidity dominate. Reinforcing cold front 
passes late Saturday night and Sunday...prolonging the comfortable 
air into Tuesday. A weak upper system passes through on Thursday. 


&& 


Near term /through Saturday/... 
surface high builds in for tonight. This will allow winds to drop 
off and skies to clear. Good radiational cooling is expected along 
with river and valley fog. Generally went with a blend of FWC/met 
temperatures tonight as mav temperatures a tad too cool. 


High gives way during the day as cold front approaches from the 
west. Still mostly sunny skies after morning valley fog with some 
high cirrus moving in to southeast Ohio zones during the afternoon hours. 
Again went with a blend FWC/met temperatures as they seem to be the most 
consistent. The mav appears to be on the warm side again. 


&& 


Short term /Saturday night through Monday night/... 
models continue in agreement with strong upper short wave inducing a 
cold front across the area Saturday night into Sunday. Kept chance 
probability of precipitation across the northern third...extending slight chance through 
central County Warning Area. 


Temperatures will remain pleasant for this period as relatively 
drier and cooler air mass is brought by the aforementioned upper 
level system. 


&& 


Long term /Tuesday through Friday/... 
high pressure remains in control through the period...except for a 
possible upper level short wave pushing a cold front on Thursday. 
HPC guide and GFS model show this feature bringing some quantitative precipitation forecast to the 
area. Included slight chance due to low confidence and to satisfy 
tolerance issued to our north. 


These upper level systems will help to maintain a fresher air mass 
over the area through next week. Tweaked HPC guide temperatures and skies through 
the period. 


&& 


Aviation /19z Friday through Wednesday/... 
high pressure will dominate through the next 12 to 24 hours. Cumulus 
and any wind will dissipate at sunset and good radiational cooling 
sets in. This will cause fog to form in river valleys and most taf 
sites will see IFR to LIFR fog between 06z-12z overnight. Fog is 
gone by 13z-14z and VFR conditions through 18z Saturday. 


Aviation outlook /after 18z Saturday/...chance of MVFR to IFR 
conditions in isolated showers/thunderstorms early Sunday. Othws no sig weather expeceted. 


&& 


Rlx watches/warnings/advisories... 
WV...none. 
Ohio...none. 
Kentucky...none. 
Virginia...none. 


&& 


$$ 
Synopsis...js 
near term...js 
short term...arj 
long term...arj 
aviation...js