000 
FXUS65 KVEF 070514
AFDVEF

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LAS VEGAS NV
913 PM PST WED FEB 6 2008

.SYNOPSIS...A NORTHWEST FLOW WILL BE OVER THE MOJAVE DESERT AND 
SOUTHERN GREAT BASIN THROUGH FRIDAY BEFORE A RIDGE OF HIGH PRESSURE 
BUILDS OVER THE AREA THIS WEEKEND. DRY CONDITIONS ARE EXPECTED 
THROUGH THE PERIOD AS TEMPERATURES WARM TO NORMAL OR SLIGHTLY ABOVE 
NORMAL. 
&&

.UPDATE...THE 00Z UPPER AIR ANALYSES AND MODEL GUIDANCE SUPPORT
THE INHERITED SHORT TERM FORECAST TRENDS AS DETAILED BELOW. NO 
UPDATE IS PLANNED. -ADAIR-

.PREV DISCUSSION.../ISSUED 225 PM PST WED FEB 6 2008/

.SHORT TERM...FORECAST AREA WILL LIE UNDER DRY NORTHWEST FLOW 
THROUGH FRIDAY WITH SHORTWAVE TROUGH PRESENTLY NEAR 50N/140W 
BRUSHING THE NORTHEAST CORNER OF NEVADA TOMORROW AFTERNOON. VARIABLE 
AMOUNTS OF HIGH LEVEL MOISTURE WILL CONTINUE TO FLOW ACROSS THE AREA 
INTO FRIDAY BEFORE RIDGE BUILDS IN FROM THE WEST ACROSS CALIFORNIA 
AND NEVADA SATURDAY. BREEZY TO LOCALLY WINDY CONDITIONS POSSIBLE 
ACROSS CENTRAL NEVADA AND MAYBE AS FAR SOUTH AS THE OWENS VALLEY 
THURSDAY AS SHORTWAVE TROUGH CLIPS NORTHEAST NEVADA. FOLLOWING THE 
PASSAGE OF THE SHORTWAVE TROUGH SURFACE HIGH BUILDS INTO THE GREAT 
BASIN AND LOCALLY BREEZY CONDITIONS POSSIBLE DOWN THE COLORADO RIVER 
VALLEY FRIDAY. WARMING TREND WILL OCCUR HEADING INTO THE WEEKEND 
WITH TEMPERATURES FINALLY GETTING BACK ABOVE NORMAL. 

.LONG TERM...HIGH PRESSURE WILL RE-ESTABLISH ITSELF OVER THE EASTERN 
PACIFIC SUNDAY AND MONDAY. AN AREA OF LOW PRESSURE WILL MOVE INTO 
THE PACIFIC NORTHWEST SUNDAY NIGHT AND DROP INTO UTAH MONDAY 
AFTERNOON. THIS SYSTEM SHOULD ONLY HAVE MINOR EFFECTS ON OUR AREA 
MAINLY WITH INCREASED SURFACE WINDS MONDAY AFTERNOON AND NIGHT. THIS 
SYSTEM IS FORECAST TO EXIT THE AREA TUESDAY WITH A RETURN TO WEAK 
RIDGING OVER THE AREA. MODELS BEGIN TO DIFFER AS ANOTHER PACIFIC LOW 
IS FORECAST TO MOVE INTO THE NORTHWEST. THE ECMWF IS MUCH STRONGER 
THAN THE GFS AND BRINGS A CLOSED LOW THROUGH NORTHERN NEVADA INTO 
NORTHERN ARIZONA WEDNESDAY. THE GFS IS MUCH WEAKER AND KEEPS THE 
MAIN ENERGY WITH THIS SYSTEM WELL NORTH AND EAST. FOR NOW IT LOOKS 
LIKE THE PACIFIC RIDGE MAY BE STRONG ENOUGH TO KEEP EVERYTHING FAR 
ENOUGH EAST. TEMPERATURES ARE EXPECTED TO BE NEAR NORMAL THROUGH THE 
PERIOD. 
&&

.AVIATION...FOR MCCARRAN...LIGHT AND VARIABLE WINDS EXPECTED TONIGHT 
AND THURSDAY ALONG WITH OCCASIONAL HIGH CLOUDINESS.

FOR THE REST OF SOUTHERN NEVADA...NORTHWEST ARIZONA...AND SOUTHEAST 
CALIFORNIA...NO SIGNIFICANT WEATHER EXPECTED ACROSS THE AREA OVER 
THE NEXT SEVERAL DAYS WITH OCCASIONAL HIGH CLOUDINESS AND LIGHT 
WIND. 
&&

.VEF WATCHES/WARNINGS/ADVISORIES...
NV...NONE.
AZ...NONE.
CA...NONE.
&&

$$

PIERCE/GORELOW

HTTP://WEATHER.GOV/LASVEGAS