296 
fxus65 kslc 220325 cca 
afdslc 


Area forecast discussion 
National Weather Service Salt Lake City Utah 
917 PM MDT sun Mar 21 2010 


Synopsis...a Pacific storm system will move into the Great Basin 
early this week. Warm and dry high pressure aloft will return for 
the midweek period. 


&& 


Discussion...the upper trough moving into the Pacific northwest this 
evening still on track to dig southeast through the Great Basin early 
this week. Looking at a two-stage trough passage Monday/Tuesday. 
The first stage will be the ejecting shortwave ahead of the main 
trough currently over western Idaho/eastern or. This feature should track due 
east tonight/early Monday with a shallow cold push through northern 
Utah Monday morning. The best middle-level cold air and dynamic lift 
likely to remain along and north of the Utah/Idaho border. Current low- 
end probability of precipitation primarily north of kslc look good for now. 


The second stage will be the main trough passage from the northwest 
beginning late Monday night. Strong ridging along the West Coast 
behind this feature will result in a further southward push 
through Utah Tuesday. This second push will re-energize the near 
700mb thermal boundary that stalled over central Utah Monday. Good 
fgen along this boundary combined with trough dynamics and colder 
air aloft should generate a fairly significant area of precipitation in 
central Utah. Instability showers a good bet across the north 
associated with the cold pool aloft. 


Strong ridging returns midweek...bringing dry conditions and above 
normal temperatures back to Utah by Thursday. The next series of 
shortwaves off the Pacific will shove the ridge east and bring a 
threat of generally light precipitation back to the area late Friday 
through Saturday. 


&& 


Aviation...VFR ceilings will prevail at the kslc terminal overnight. 
The next operational concern is the timing of a frontal passage at 
kslc late Monday morning. Winds this evening will hold out of the 
west...then come around to south again after 06z. Ceilings expected to 
gradually lower Monday morning in advance of this front. Ceilings could 
fall below 7k feet above ground level at times Monday afternoon in heavier showers. 


&& 


Slc watches/warnings/advisories... 
Utah...none. 
Wyoming...none. 
&& 


$$ 


Public...Conger 
aviation...Myrick 


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