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fxus65 kvef 191637 aaa 
afdvef 


Area forecast discussion 
National Weather Service Las Vegas Nevada 
938 am PDT Friday Mar 19 2010 


Synopsis...locally gusty north winds will persist behind an exiting 
low pressure system today. High pressure building in over the 
weekend will result in mostly clear skies with temperatures warming 
to about 5 degrees above normal by Sunday. 
&& 


Update...satellite shows cloudiness has exited southern Mohave 
County as shortwave trough moves east across Arizona leaving clear 
skies areawide. Advisory level gusts are being observed within the 
Colorado River valley between Lake Mohave and Lake Havasu City. Will 
update the zones to remove the mention of clouds/showers from Mohave 
County. No other changes made. 
&& 


Aviation...for McCarran...north to northeast winds around 10kts 
will continue through today. Winds may increase at times this 
morning and gust up to 20 kts. Mostly clear skies are expected. 


For the rest of southern Nevada...northwest Arizona...and southeast 
California...north to northeast winds across the area will generally 
be around 10-20kts through much of today. Stronger winds are 
expected down the Colorado River valley where winds may gust over 
35kts though late afternoon. Mostly clear skies anticipated across 
the entire area. -Jacques- 
&& 


Previous discussion...300 am PDT Friday Mar 19...no significant 
differences in model solutions through Sunday. Low pressure system 
responsible for the strong winds Thursday and Thursday night will 
move into the Rocky Mountain region today with strong but dry 
northerly flow over the forecast area. Nam12 based MOS guidance 
supports the Wind Advisory in effect today for the Colorado River 
valley with locally breezy conditions across the rest of the area. 
An upper ridge will build in over the weekend with mostly clear 
skies and lighter winds. European model (ecmwf) is trending stronger with a shortwave 
trough moving into the Pacific northwest Sunday night. For now it 
looks like any precipitation with this feature will remain well to 
the north through Sunday night however. Temperatures will start out 
fairly warm this morning due to winds and lingering cloud cover 
overnight. As a result...high temperatures are still expected to be 
a little above normal today. Saturday looks to be the coolest day in 
the short term with temperatures warming to around 5 degrees above 
normal by Sunday. 


Long term...fairly good agreement between models through the 
extended period with another strong system potentially affecting the 
area Tuesday and Wednesday. Ridge continues to break down Monday as 
a Pacific shortwave starts diving southeast. By Tuesday 
morning...both the Euro/GFS are showing a closed low forming across 
the Idaho/NV/UT border and eventually pushing south along the 
Nevada/Utah border Tuesday afternoon. This is a fairly similar 
pattern to the last two systems...including the one that came 
through yesterday. Did increase winds across the entire area and 
probability of precipitation mainly over the eastern areas of the County Warning Area...although this 
system...like the previous ones will have little available moisture 
to work with. Temperatures on Tuesday look to be the warmest of the 
week before falling several degrees Wednesday. Temperatures will 
start to rebound Thursday and Friday as high pressure rebuilds back 
over the area. 
&& 


Vef watches/warnings/advisories... 
Nevada...Wind Advisory until 6 PM PDT this evening for nvz021. 
Arizona...Wind Advisory until 6 PM MST this evening for azz002-036. 
California...Wind Advisory until 6 PM PDT this evening for caz527. 
&& 


$$ 


Pierce/Harrison/gorelow 


Http://weather.Gov/lasvegas