145 
fxus65 kslc 030353 
afdslc 


Area forecast discussion 
National Weather Service Salt Lake City Utah 
855 PM MST Tuesday Dec 2 2008 


Synopsis...a cold northwest flow aloft will remain across Utah 
through Wednesday. The next weak storm system will move through 
northern Utah and southwest Wyoming late Wednesday night and 
Thursday. Warm and dry high pressure will settle over the area 
for Friday and Saturday. 


&& 


Discussion...water vapor animation shows the well-defined upper 
trough moving steadily southeast through Utah this evening. This feature 
should exits through the 4-corners region by midnight...leaving a 
significantly colder airmass in place late tonight. Shallow cold 
advection and abundant low-level moisture across far northern Utah and SW 
Wyoming overnight will keep plenty of clouds in place along with 
some very light precipitation into Wednesday morning. 


The next system dropping south-southeast out of western Canada late 
Wednesday will stretch out SW-NE as it enters northern Utah. Though 
weakening...this feature still has adequate dynamic lift and thermal 
advection to indicate enough lift for precipitation. Current forecast 
package does have a mention of precipitation for the north...which looks 
fine for now. 


Latest European model (ecmwf)/GFS both show a closed low forming along the California coast 
by Friday...with ridging developing over the Great Basin for the 
weekend. A developing ridge near or a little west of 140w will bring 
a series of energetic troughs southeast through the basin beginning early 
next week. Substantial amounts of precipitation are possible during next 
week...with temperatures cold enough for snow most elevations by midweek. 


Issued an earlier update to drop the Wind Advisory and adjust temperatures 
a bit up north due to cloud cover. 


&& 


Aviation...southeasterly drainage winds are expected to develop at 
the slc terminal between 08z and 11z...with a 20 percent chance that 
winds will stay light northerly through the entire night. Ceilings 
are still likely to be below 7000ft above ground level for periods of time 
throughout tonight...though there is a chance that clouds will 
become scattered between 05z and 09z. 


&& 


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


&& 


$$ 


Conger/schoening 


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