Area Forecast Discussion
Issued by NWS Las Vegas, NV

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FXUS65 KVEF 172250
AFDVEF

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LAS VEGAS NV
250 PM PST WED DEC 17 2014

.SYNOPSIS...SCATTERED LIGHT RAIN SHOWERS AND MOUNTAIN SNOW SHOWERS
WILL DIMINISH OVERNIGHT AS A WEATHER SYSTEM SLOWLY MOVES ACROSS THE
DESERT SOUTHWEST. IMPROVING CONDITIONS ARE EXPECTED THURSDAY AND
FRIDAY. A FEW SHOWERS WILL BE POSSIBLE ACROSS THE GREAT BASIN OVER
THE WEEKEND FOLLOWED BY DRY AND WARMER WEATHER NEXT WEEK.
&&

.SHORT TERM...EXTENSIVE LOW TO MID LEVEL CLOUDS WERE APPARENT FROM
SATELLITE LOOPS AND SURFACE OBSERVATIONS ACROSS THE FORECAST AREA
AND THESE WILL BE SLOW TO CLEAR OUT TONIGHT THROUGH THURSDAY. RECENT
RADAR LOOPS SHOWED A SLIGHT UPWARD TREND IN SCATTERED SHOWERS ACROSS
SOUTHERN CLARK AND CENTRAL MOHAVE COUNTIES EARLY THIS AFTERNOON AND
THE HRRR MODEL INDICATES THIS WILL BE THE PRIMARY AREA FOR
PRECIPITATION THROUGH EARLY THIS EVENING. ANY ADDITIONAL SNOW
AMOUNTS IN THE MOUNTAINS OF SOUTHERN NEVADA AND NORTHWEST ARIZONA
ARE EXPECTED TO BE VERY LIGHT AND THE WINTER WEATHER ADVISORY HAS
BEEN CANCELLED. THE MEAN TROUGH OVER THE REGION WILL DIG A
LITTLE TONIGHT AS A SHORTWAVE WEST OF POINT CONCEPTION DIVES TOWARD
NORTHERN BAJA. AN ADDITIONAL BAND OF MOISTURE ASSOCIATED WITH THIS
SHORTWAVE WILL MOVE INTO THE SOUTHERN SIERRA OVERNIGHT AND WILL
PRODUCE A CHANCE OF VERY LIGHT SNOW OVER THE EASTERN SLOPES...SO
POPS WERE INCREASED ACCORDINGLY.

THE TROUGH AXIS WILL SHIFT EASTWARD THURSDAY WITH GRADUAL CLEARING
THURSDAY AFTERNOON THROUGH THURSDAY NIGHT. LITTLE CHANGE IN
TEMPERATURES CAN BE EXPECTED.
&&

.LONG TERM...FRIDAY THROUGH TUESDAY.

MEDIUM RANGE MODELS SIMILAR TO 24 HOURS AGO INDICATING MOST OF THE
ENERGY ASSOCIATED WITH NEXT SHORTWAVE TROUGH WILL AFFECT CENTRAL
NEVADA NORTHWARD FRIDAY NIGHT INTO SATURDAY. WITH THAT SAID, LEFT IN
SLIGHT CHANCE POPS FROM NORTHERN INYO COUNTY EASTWARD TO NORTHERN
LINCOLN COUNTY TO ACCOUNT FOR ANY POTENTIAL SOUTHWARD SHIFT.

SUNDAY THROUGH TUESDAY THE LONGWAVE PATTERN WILL BE DOMINATED BY A
STRONG RIDGE ALONG THE WEST COAST WITH A TROUGH EAST OF THE ROCKIES.
SOUTHERN GREAT BASIN/MOJAVE DESERT WILL LIE UNDER A DRY NORTHWEST
FLOW. SURFACE HIGH DEVELOPING OVER THE NORTHERN GREAT BASIN WILL
LEAD TO AN INCREASE IN NORTH BREEZES DOWN THE COLORADO RIVER VALLEY
SOUTH OF HOOVER DAM SUNDAY-TUESDAY.
&&

.AVIATION...FOR MCCARRAN...CEILINGS BETWEEN 3K-6K FEET AROUND WILL
PERSIST THROUGH EARLY EVENING THEN HOVER AROUND 6 KFT BEFORE
PARTIALLY CLEARING AND LIFTING TO AROUND 10 KFT THURSDAY MORNING.
GENERALLY LIGHTS WINDS WILL CONTINUE TONIGHT.

FOR THE REST OF SOUTHERN NEVADA...NORTHWEST ARIZONA...AND SOUTHEAST
CALIFORNIA...CEILINGS OF 3K-5K FT AND MOUNTAIN OBSCURATION WILL
CONTINUE ACROSS MUCH OF THE REGION TONIGHT THROUGH THURSDAY MORNING
FOLLOWED BY PARTIAL CLEARING AS A WEAK WEATHER SYSTEM GRADUALLY
MOVES TO THE EAST.
&&

.SPOTTER INFORMATION STATEMENT...SPOTTERS ARE ENCOURAGED TO REPORT
ANY SIGNIFICANT WEATHER CONDITIONS TODAY THROUGH THURSDAY ACCORDING
TO STANDARD OPERATING PROCEDURES.
&&

$$

SHORT TERM/AVIATION...ADAIR
LONG TERM...PIERCE

FOR MORE FORECAST INFORMATION...SEE US ON OUR WEBPAGE:

HTTP://WEATHER.GOV/LASVEGAS OR FOLLOW US ON FACEBOOK AND TWITTER








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