645 
fxus65 kvef 081210 cca 
afdvef 


Area forecast discussion...corrected 
National Weather Service Las Vegas Nevada 
330 am PST Thursday Jan 8 2009 


Corrected short term paragraph 


Synopsis...high pressure will continue through late today which 
will keep dry conditions and warmer temperatures over the area. A 
weak front will cross the area tonight and Friday morning. This will 
usher in slightly cooler temperatures Friday and Saturday along with 
an increase in north winds. The strongest winds will occur down the 
Colorado River valley Friday afternoon through the weekend. 
&& 


Short term...satellite shows clear skies across the forecast area 
early this morning under a ridge of high pressure. Little change 
needed to forecast as models consistent in evolution of pattern next 
few Days. Ridge will shift east today which will open the door for 
trough approaching the Pacific northwest coast to move inland into 
the northern rockies and northern Great Basin by late afternoon. 
Trough continues east tonight before digging southeast across 
eastern Utah/western Colorado Friday. For our area models have been 
getting progressively drier and this looks reasonable based on 
narrowing of moisture plume feeding into trough off the northern 
California coast. So have removed the mention of precipitation from 
all zones with this package. Cold front associated with trough will 
move southeast across south central Nevada/Inyo County tonight 
reaching Las Vegas early Friday morning. As surface high builds into 
northern Utah and support aloft with 850/700 mb winds phase 
together north winds will increase throughout the day 
Friday...especially locales that favor north winds like the Colorado 
River valley. Support for north winds continues down the Colorado 
River valley through Saturday. A lake Wind Advisory looks probable 
Friday and maybe even Saturday. Today will be the warmest day of the 
next three. Did bump up temperatures a few degrees Friday and 
Saturday as cold air advection behind front looks less 
impressive. 


Long term...high pressure is expected over the western Continental U.S. Days 4 
through 7 bringing dry...mainly clear conditions to the region. A 
north/south surface pressure gradient is forecast to remain over the 
area Sunday through early Wednesday which will continue gusty north 
winds over much of the area. The strongest winds will be in north to 
south oriented channels such as the Colorado River valley. 
Temperatures are expected to be at or slightly above normal. 
&& 


Aviation...for McCarran...winds will be light and variable through 
this evening with variable high clouds at or above 20k feet. A cold front is 
expected to pass through the valley early Friday bringing gusty 
north winds that will continue into the weekend. 


For the rest of southern Nevada...northwest Arizona...and southeast 
California...generally light and variable winds expected through 
this afternoon except across the Sierra where westerly winds will 
increase as a weak system moves into the West Coast. A cold front 
will bring gusty north winds to the northern regions tonight and to 
the central and southern areas on Friday. Sky cover will consist of 
variable high clouds at or above 20kft. 
&& 


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


$$ 


Pierce/Salmen 


Http://weather.Gov/lasvegas