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fxus64 khun 071110 aaa 
afdhun 


Area forecast discussion...updated 
National Weather Service Huntsville Alabama 
610 am CST Sat Nov 7 2009 


Update...12z aviation. 
&& 


Aviation...VFR conditions will persist through the taf period. 
&& 


Discussion...issued 320 am CST Sat Nov 7 2009... 
large upper high was across the Southern Plains/southeastern US with a weak upper 
disturbance moving across the Ohio Valley. Only some high clouds 
were associated with this disturbance. Since the atmosphere is so 
dry over our County Warning Area...don't expect these clouds to make it this far 
south. Otherwise temperatures around the area were in the middle 40s with a few 
cold spots of around 40. Winds are light. 


Today/Sunday...combination of high pressure/very dry atmosphere will 
keep skies sunny. The high will slowly move east allowing for the 
winds to become S/southeast which will begin a slight warming trend f0r 
this weekend. 


Monday/Tuesday...a cold front approaching from the north will team up 
with an upper trough/tropical system to the south...to produce a chance 
of showers across the County Warning Area. NAM shows that the rain will likely hold 
off until Tuesday...while European model (ecmwf)/GFS has the showers beginning by 
Monday night. For now will lean towards the ECMWF/GFS. 


Instability/low level shear are very weak so does not look like any 
thunderstorms and rain will be possible during this time frame. Another thing to note 
is that the European model (ecmwf)/GFS keeps the heaviest precipitation to our south...we may 
just get some light shower activity with this next system. 


Wednesday through Friday...precipitation should end after midnight on Tuesday 
with another large area of high pressure and cooler temperatures moving 
across the County Warning Area. Kept this period dry...however another cold front will be 
heading our way by next weekend...which will increase the chance of 
precipitation over the County Warning Area. 
&& 


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


Aviation...bcc 
discussion...07