100 
fxus64 khun 211730 aac 
afdhun 


Area forecast discussion...updated 
National Weather Service Huntsville Alabama 
1130 am CST Sat Nov 21 2009 


Update...for 18z taf issuance. 


&& 


Aviation...VFR conditions are expected for the next 18-20 hours. 
Ceilings will gradually drop beginning around 08z as precipitation from 
approaching low pressure system overspreads the area. Visible/ceiling may 
begin to drop to MVFR by late in the period and have included a 
general trend with ceilings at this point. 


&& 


Discussion.../issued at 1015 am CST Sat Nov 21 2009/ 
the shortwave trough and accompanying surface low pressure over the Gulf 
of Mexico continues to move northeast towards the Tennessee Valley. Current 
analysis places the surface low over the NE portions of the Gulf of 
Mexico with the trough axis placed just to the northwest of the surface low. 


At this point...most of the shower activity is staying well south 
of the region over the lower Mississippi Delta Region. The precipitation 
will gradually shift north during the day...but most precipitation will 
hold off until the evening hours. 


The cirrus canopy has eroded somewhat. However...the canopy will 
thicken and move across north Alabama later this afternoon as the system 
approaches. Despite the cloud cover...a generally nice fall day 
will result with daytime highs rising into the low to middle 60s. 


Have made some changes to the sky condition and temperature forecast 
grids to account for these trends. 


&& 


Hun watches/warnings/advisories... 
Alabama...none. 
Tennessee...none. 
&& 


$$ 


Sl.77