943
FXUS65 KVEF 081731
AFDVEF
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LAS VEGAS NV
930 AM PST SUN NOV 8 2009
SYNOPSIS
DRY WEATHER WITH ABOVE NORMAL TEMPERATURES WILL CONTINUE
THROUGH WEDNESDAY. A PACIFIC STORM SYSTEM WILL BRING COOLER AND MORE
UNSETTLED WEATHER LATE IN THE WEEK INTO THE WEEKEND...WITH A SLIGHT
CHANCE OF VALLEY RAIN AND MOUNTAIN SNOW MAINLY NORTH OF LAS VEGAS.
UPDATE
LIGHT TO MODERATE NORTH WINDS WERE EVIDENT ON SURFACE
OBSERVATIONS ACROSS NORTHERN CLARK AND SOUTHERN NYE/LINCOLN COUNTIES
THIS MORNING. GUSTS OF 15 TO 20 MPH HAVE OCCURRED OVER THE NORTHERN
PART OF THE LAS VEGAS VALLEY. HOWEVER...RECENT SURFACE ANALYSES
SHOWED A RAPID DECREASE IN THE ELY/NEEDLES PRESSURE GRADIENT AND
THIS TREND IS EXPECTED TO CONTINUE. THE 12Z NAM/GFS INDICATE SUPPORT
FOR NORTH WIND VANISHES SHORTLY AFTER 18Z. NO FORECAST UPDATE NEEDED.
AVIATION...FOR MCCARRAN
NORTHEAST WINDS AROUND 7-10 KNOTS ARE
EXPECTED IN THE LAS VEGAS VALLEY THROUGH ABOUT 20Z BEFORE
DIMINISHING TO UNDER 6 KNOTS FOR THE REMAINDER OF THE AFTERNOON.
LIGHT WINDS EXPECTED OVERNIGHT. VARYING AMOUNTS OF HIGH CLOUDS TO
CONTINUE.
FOR THE REST OF SOUTHERN NEVADA...NORTHWEST ARIZONA...AND SOUTHEAST
CALIFORNIA...NORTH TO NORTHEAST WINDS AROUND 8-12 KNOTS EXPECTED
THROUGH 20Z BEFORE DIMINISHING TO UNDER 7 KNOTS FOR THE REMAINDER OF
THE AFTERNOON. LIGHT WINDS EXPECTED OVERNIGHT. VARYING AMOUNTS OF
HIGH CLOUDS TO CONTINUE.
PREV DISCUSSION
/224 AM PST SUN NOV 8 2009/
SHORT TERM
SATELLITE SHOWS ANOTHER SLUG OF CIRRUS ALONG AND WEST
OF HIGHWAY 95 AND PUSHING EAST. SURFACE OBS SHOW GENERALLY LIGHT
WINDS EXCEPT FOR NORTHERLY BREEZES AT A COUPLE OF WIND PRONE
STATIONS ON THE NEVADA TEST SITE COURTESY OF SURFACE HIGH PRESSURE
OVER THE GREAT BASIN AND THE THERMAL LOW OVER THE COLORADO RIVER
VALLEY. QUIET WEATHER WILL CONTINUE THROUGH TUESDAY NIGHT WITH
OCCASIONAL WAVES OF CIRRUS PASSING THROUGH. TEMPERATURES WILL FALL A
FEW MORE DEGREES TODAY COMPARED TO YESTERDAY...CHANGE LITTLE ON
MONDAY...AND THEN RISE A COUPLE DEGREES ON TUESDAY AS SOUTHWEST FLOW
INCREASES AHEAD OF A STORM OVER THE EASTERN PACIFIC.
LONG TERM
NOT MUCH TO CHANGE IN THE LONG TERM FORECAST. THOUGH
DIFFERING IN THE DEPTH AND SPEED OF THE TROUGH TO PASS THROUGH
THURSDAY AND FRIDAY THE MODELS ARE IN AGREEMENT IN THE OVERALL
SCENARIO. MOISTURE AND HENCE PRECIPITATION WILL BE PRIMARILY
CONFINED TO OUR NORTHERN PORTIONS OF THE CWA. AMOUNTS WILL BE LIGHT
IN THIS SITUATION AND IT IS NOT OUT OF THE QUESTION SOME LIGHT
AMOUNTS COULD FALL IN NORTHERN MOHAVE COUNTY AND THE SOUTHERN NEVADA
MOUNTAINS AS WELL. TEMPERATURES WILL DROP AT THE END OF THE WEEK
BEHIND THE COLD FRONT TO ABOUT NORMAL LEVELS. WINDS AHEAD OF THE
SYSTEM COULD GET TO THE BREEZY LEVEL WEDNESDAY AND THURSDAY. NEXT
WEEKEND IS A BIT UNCLEAR BUT CONSENSUS IS FOR SMALLER AMPLITUDE
WAVES TO PASS THROUGH IN ZONAL FLOW WITH MOST OF THE ACTIVITY
ASSOCIATED WITH THEM WELL TO OUR NORTH.
VEF WATCHES/WARNINGS/ADVISORIES
NV...NONE.
AZ...NONE.
CA...NONE.
ADAIR/GORELOW/MORGAN/JACQUES
HTTP://WEATHER.GOV/LASVEGAS
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