086 
fxus65 kslc 231142 
afdslc 


Area forecast discussion 
National Weather Service Salt Lake City Utah 
442 am MST Monday Nov 23 2009 


Synopsis...high pressure aloft will strengthen across the region 
through mid-week. A Pacific storm system is expected to spread 
into the region late in the week into the upcoming weekend. 


&& 


Discussion...storm system which brought widespread snowfall to a 
good portion of northern Utah Sunday afternoon and evening 
continues to propagate eastward into the Central High plains this 
morning. Associated cold front has pushed through the forecast 
area...with surface high pressure centered across the eastern 
Great Basin. Warming aloft has stabilized the airmass considerably 
across northern Utah which has greatly diminished snow shower 
activity downstream from the gsl. Allowed going Winter Weather Advisory 
to expire as scheduled at 4am...with any lingering snow showers 
likely dissipating by sunrise. 


Models are in general agreement amplifying a middle level ridge 
across the region through the middle portion of the week. Warming 
aloft combined with snow on the ground and low sun angle will all 
contribute to strengthening valley inversions across much of 
northern and central Utah through this time...while warming aloft 
will be more noticeable at higher elevations. 


Medium range models advertise a fairly disorganized middle level 
trough to move into the region late in the week and into the 
upcoming weekend. However differences abound with respect to how 
this trough will evolve as it passes through the region and 
timing/track of individual shortwave features. As a result 
trended probability of precipitation up to climatology or slightly above from Friday on. 




&& 


Aviation...ceilings at the slc terminal will remain between 4500 
and 6500 feet through 17z with a 30 percent chance of breaking into 
a scattered layer by 15 to 16z while there is a 10 percent chance of 
ceilings lasting through 20z. No other forecast issues of concern. 


&& 


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


&& 


$$ 


Seaman/struthwolf 


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