600 
fxus65 ktwc 211613 
afdtwc 


Area forecast discussion 
National Weather Service Tucson Arizona 
915 am MST Sat Nov 21 2009 


Synopsis...weather systems will continue to pass north of our area. 
Other than some occasional patches of high clouds...Southeast 
Arizona will remain dry with mostly clear skies and warm daytime 
temperatures. 


&& 


Discussion...trough digging into the intermountain west with energy 
and moisture tracking well north of our area. Modest gradient 
enhancement...probably won't see much difference compared to normal 
diurnal trends. Shortwave ridge with little inflection Sunday before 
another impulse rides through well north of the area Sunday night. 
Dirty ridge for much of the new week...but actual height and 
thickness gains will not be that unseasonable. Just a few degrees 
above climatology. 


&& 


Aviation...some wisps of cirrus next 24 hours otherwise it will be 
clear. Expect normal diurnal wind trends at the terminal sites. 
Aviation discussion not updated for taf amendments. 


&& 


Fire weather...a Pacific weather system will move north of the area 
today. Dry conditions will continue across Southeast Arizona 
although some west and southwest breezes may occur...particularly 
across the higher terrain north and east of Tucson this afternoon. 
Dry conditions will continue Sunday into Monday under westerly to 
northwesterly flow aloft. 


&& 


Twc watches/warnings/advisories...none. 


$$ 


Weather.Gov/Tucson