538 
fxus65 ktwc 210926 
afdtwc 


Area forecast discussion 
National Weather Service Tucson Arizona 
225 am MST sun Mar 21 2010 


Synopsis...high pressure aloft will bring dry and warm conditions 
through Monday. A low pressure system may bring a few showers to the 
area late Tuesday into Wednesday along with cooler daytime 
temperatures. Dry conditions to occur Thursday and Friday as high 
pressure aloft returns. 


&& 


Discussion...upper level ridge axis this morning extended from 
northern Baja California into Montana. Some thin high clouds will pass through 
the ridge today otherwise it will be sunny with much warmer daytime 
temperatures. Warmer yet on Monday even as upper level ridge 
flattens over the area. Will also see more high clouds pass through 
the ridge. The flattening of the ridge is in response to a system 
moving through the Pacific northwest. Additionally there is a 
southern stream Pacific system that will be moving toward northern 
Baja California late Monday. These two systems will phase together on Tuesday 
and bring a slight chance to chance of showers to the area Tuesday 
afternoon into early Wednesday. Snow levels will lower to about 6500 
feet Tuesday night with minor accumulations above 7000 feet. Cooler 
temperatures with highs 8-10 degrees cooler than Monday. System 
moves east of the area on Wednesday afternoon with showers ending 
from west to east. Dry with a warming trends Thursday into Saturday. 


&& 


Aviation...few to scattered cirrus clouds over the next 24 hours. 
Surface winds Ely/southeasterly 5-15 kts this morning. Aviation discussion 
not updated for taf amendments. 


&& 


Fire weather...high pressure aloft will bring dry conditions with 
warmer daytime temperatures today into Monday. No wind concerns are 
expected both days. A low pressure system will then bring a chance 
of showers late Tuesday into Wednesday. Dry with diurnal wind trends 
Thursday and Friday as high pressure aloft returns. 


&& 


Twc watches/warnings/advisories...none. 


$$ 


Weather.Gov/Tucson