774 
fxus63 kind 052230 
afdind 


Area forecast discussion 
National Weather Service Indianapolis in 
630 PM EDT Sat Jul 5 2008 


Aviation...discussion for 060000z taf issuance. Diurnal clouds based 
around 035-040 expeceted to dissipate by an hour or so after sunset. 


Otherwise...synoptic pattern favors fairly widespread fog development tonight 
with crossover temperatures easily within reach. Based on prognosticated 
temperature/dewpt spreads...will probably see visibilities restrictions develop as 
early as 060300z...with areas of IFR/LIFR developing after 060500z. Due to 
the shallowness of the moisture...some improvment possible towards 
061200z. 


&& 


Discussion... 


Forecast focus will be timing and covering of thundershowers across the forecast area early in the 
week. Mostly only diurnal cumulus across central Indiana this afternoon as 
upper trough was sliding southeast across scntrl Indiana with surface high pressure across 
across the lower Great Lakes. 


Expect much of the cloud cover to dissipate after dark as upper ridge 
moves across and surface high pressure remains in place. Could be some fog 
tonight based on afternoon dew points and clearing trends. So...will mention 
patchy fog overngt. Otherwise...models in pretty good general 
agreement. Tomorrow should see a good degree of sunset with only some 
afternoon cumulus mainly east as the middle levels remain dry. Then upper wave 
moves across on Monday which will interact with upper 60 dew points that 
should be enough for some scattered development mainly in the afternoon. 
Otherwise...best chance from Tuesday-Wednesday as cold fnt and another upper wave 
move through. Went with good chance probability of precipitation then. Later in the week...high 
pressure should keep rain away. 


Went with warmer GFS temperatures based on some sunset and S flow. 


&& 


Ind watches/warnings/advisories...none. 


&& 


$$ 


Aviation...jas 
public...mk