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Area forecast discussion 
National Weather Service St Louis MO 
346 PM CDT Friday Aug 29 2008 


Discussion... 
/345 PM CDT Friday Aug 29 2008/ 


Synopsis... the clouds that lingered in the wake of the cold 
front last night finally broke up this afternoon as drier air 
continues to filter into the region. Dew points haven't dropped off 
much from I-70 south yet...but expect them to overnight as the 
high starts to build into the upper Midwest. 


Short term...Holiday weekend 
a beautiful Holiday weekend looks to be in store as high pressure 
dominates the weather across the Midwest. Mostly sunny skies with 
seasonable temperatures can be expected with dew points in the 50s 
to low 60s. This will make for comfortable day time conditions and 
cool nights. 


The high pressure will gradually slide to the east by Monday with 
temperatures moderating to slightly above normal and humidity slowly 
building back into the area. Temperatures in the upper 80s and lower 
90s degrees should be the rule Monday and Tuesday. 


Extended...Tuesday-Friday 
the upper level ridge that will be responsible for the great weather this 
weekend will slide to the East Coast and a trough should develop 
over the western U.S. Early next week. The main concern for this 
period is the impact from the remnants of Hurricane Gustav. Current 
indications are that the center of the system will track to the west 
of the County Warning Area...impacting the area in the Thursday/Friday time frame. 
The ultimate track of this tropical system hinges on the strength 
and timing of a shortwave that is expected to rotate around the base 
of the aforementioned trough on Wednesday. 




Miller 


&& 


Aviation... 
/1252 PM CDT Friday Aug 29 2008/ 
for the 18z tafs...abundant low-level moisture continues to 
produce broken to scattered layer of clouds over the region. 
Latest surface analysis shows weak cold front extending from weak 
surface low over Northeast Indiana through southeast Missouri and 
into far northern Arkansas where older convection continues to 
weaken. What is interesting is the abundance and persistence of 
low-level moisture stretching across southern two thirds of 
Illinois through the southern half of Missouri. Drier air from the 
north is slowly intruding southward into central and east central 
Missouri. Weak surface high pressure is responsible for the slow 
intrusion of the drier air from the north. Tonight light winds and 
residual moisture will bring some light fog mainly over parts of 
central Missouri and sus. Brought visibilities briefly down to 3 Michigan over 
cou and sus after 10 UTC. Surface high pressure will continue to 
funnel drier air over region on Saturday. 


Rp 


&& 


Lsx watches/warnings/advisories... 
MO...none. 
Illinois...none. 
&& 


$$ 


Weather forecast office lsx