856 
fxus65 kslc 091651 
afdslc 


Area forecast discussion 
National Weather Service Salt Lake City Utah 
951 am MST Friday Jan 9 2009 


Synopsis...a Pacific storm system over northern Utah will continue 
southeast through the state today. Strengthening high pressure along 
the West Coast will maintain a mild northwest flow across the Great 
Basin through the weekend. 




&& 


Discussion...the cold front has about cleared the forecast area 
this morning...with the boundary located near the Utah/Arizona border. 
The upper trough is continuing southeast...and there is an area of 
thicker clouds near the center...which is situated over southwest 
Utah. Instability showers continue in the vicinity of the 500 mb 
cold pool that is situated over northern Utah...though 
accumulations from these showers remain light. The showers will 
taper off this afternoon as the cold pool shifts east and high 
pressure begins to move in behind the exiting trough. With this in 
mind...will allow the existing winter weather headlines to expire 
as scheduled at 11 am. Will update the zones at that time to 
remove the headlines. No additional updates planned. 


High pressure along the California coast is expected to build over 
the weekend...keeping a drier northwest flow over most of the 
state. However...models indicate weak shortwaves grazing northeast 
Utah and southwest Wyoming both Saturday and Sunday that would 
keep a more moist airmass over that part of the forecast area and 
limit warming aloft. Still...the clearing skies over the forecast 
area combined with snow cover make fog a possibility over some 
valley locations tonight and tomorrow night. 


As the ridge expands early next week...drier and warmer air is 
expected to spread across the entire region. This would result in 
valley inversions and the possibility of urban haze problems by 
midweek. 


&& 


Aviation...VFR conditions expected at slc terminal with ceilings below 
7 kft through this afternoon. There is a 20 percent chance of 
temporary MVFR conditions in a scattered rain/snow shower through 
20z. Northwest winds at slc terminal will continue until winds shift 
to the southeast around 03z this evening. 


&& 


Slc watches/warnings/advisories... 
Utah...Winter Weather Advisory until 11 am Friday for utz006>009. 


Wyoming...none. 


&& 


$$ 


Public...traphagan 
aviation...Myrick/Kruse 


For more information from National oceanic and atmospheric administration/S National Weather Service visit... 
http://weather.Gov/saltlakecity (all lower case)