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Area forecast discussion 
National Weather Service Flagstaff Arizona 
235 PM MST Friday Nov 20 2009 


Synopsis...a dry westerly flow aloft over Arizona will bring clear 
to partly cloudy skies...mild days...and cold nights for the next 
several days. A dry low pressure system will bring breezy southwest 
winds to much of northern Arizona on Saturday. 


&& 


Discussion...a high pressure ridge was centered over Arizona today 
with a trough moving onto the West Coast. Mostly clear skies and 
light winds were noted over northern Arizona with increasing high clouds 
from the approaching trough. Most of the moisture from the 
approaching weather system will be lost crossing the Sierra Nevada 
mountains...and the main impacts for northern Arizona will be a decrease 
in temperatures over the mountains and stronger southwest winds. 
Valley locations across northeast Arizona will actually see slightly 
warmer temperatures Saturday due to mixing of inversions with the 
stronger winds. 


Sunday through much of next week...dry west to northwest flow aloft 
is expected with mild daytime temperatures...cold nights and 
generally light winds. A tendency toward northeast surface winds 
will predominate through much of the work week due to surface high 
pressure building to the north of Arizona 


&& 


Aviation...for the 00z package...expect VFR conditions with an 
increase in scattered high clouds across northern Arizona for the 
next 24 hours. Southwest winds of 10 to 20 kts with gusts around 30 
kts to devlp by 18z Sat. Aviation discussion not updated for 
amendments. 


&& 


Fgz watches/warnings/advisories...none. 


&& 


$$ 


Public.................Djo 
aviation...............tc 


Visit weather.Gov/Flagstaff for northern Arizona weather information.