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Area forecast discussion 
National Weather Service Las Vegas Nevada 
318 PM PST Sat Nov 21 2009 


Synopsis...the region will be under a dry northwest flow through 
Monday. Some high clouds will drift overhead from time to time while 
locally gusty north winds will occur mainly down the Colorado River 
valley Monday. Temperatures will be within a few degrees of normal 
through Monday. Dry and pleasant weather will continue Tuesday 
through Friday. 
&& 


Short term...one upper level disturbance will be exiting our area 
early this evening while the next disturbance will brush across 
northern Nevada Sunday. Following the passage of that system a ridge 
of high pressure will begin to build in from the west Monday. An 
increasing north/south surface pressure gradient will lead to north 
breezes mainly down the Colorado River valley Monday. Some high 
clouds will move overhead at times while temperatures will be 
running withing a few degrees of normal. 


Long term...continued good agreement through Thursday... 
Thanksgiving...and again only small changes made to the previous 
forecast. All indications are for a ridge over the area and for a 
warm up to slightly above normal temperatures and little in the way 
of cloud cover or winds. The GFS and European model (ecmwf)/Gem continue to part ways 
with the next wave expected Friday and Saturday. The ec and Gem 
continues to bring in a deeper trough while the GFS and most of its 
ensemble members and mean keep it shallower and further north. For 
now just kept in the climatology probability of precipitation. If these differences continue will 
likely go towards the deeper solution and hence lower temperatures 
the end of next week...increase winds and probability of precipitation. 
&& 


Aviation...for McCarran...light and variable winds through about 
02z and then the usual night time southwest to west winds...all 
under 10 knots. Sunday will see continued light winds and from the 
northeast to east. Any cloud cover will remain few to scattered and 
above 20kft with increasing high clouds Sunday afternoon. 


For the rest of southern Nevada...northwest Arizona...and southeast 
California...generally light winds that will follow local diurnal 
patterns. A few high clouds for the rest of today and tonight with 
increasing high clouds Sunday afternoon. 
&& 


Vef watches/warnings/advisories... 
Nevada...none. 
Arizona...none. 
California...none. 
&& 


$$ 


Pierce/Jacques 


Http://weather.Gov/lasvegas