Area Forecast Discussion
Issued by NWS Las Vegas, NV

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FXUS65 KVEF 310406 AAA
AFDVEF

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LAS VEGAS NV
905 PM PDT SAT AUG 30 2014

.SYNOPSIS...BREEZY CONDITIONS WILL PERSIST INTO THIS EVENING AS A
LOW PRESSURE SYSTEM MOVES ACROSS NORTHERN NEVADA. TEMPERATURES WILL
COOL A BIT SUNDAY BEHIND THIS SYSTEM. OTHERWISE...DRY CONDITIONS
WILL PERSIST THROUGH THE LABOR DAY WEEKEND AND MOST OF NEXT WEEK.
&&

.UPDATE...LOCALIZED DOWNSLOPE WINDS CONTINUE TO AFFECT PARTS OF THE
FAR SOUTHERN OWENS VALLEY BUT ARE SLATED TO DIMINISH OVER THE NEXT
FEW HOURS. WILL KEEP ADVISORY GOING THROUGH 10 PM. OTHERWISE, BAND
OF HIGH CLOUDS ACROSS THE MOJAVE DESERT/NORTHWEST ARIZONA WILL
CONTINUE TO SLIDE SOUTH AND DIMINISH OVERNIGHT AS TROUGH TO OUR
NORTH MOVES EAST. REST OF THE HOLIDAY WEEKEND LOOKS SPECTACULAR WITH
CLEAR SKIES AND TEMPERATURES NOT AS WARM AS TODAY. WILL UPDATE IN AN
HOUR TO REMOVE ADVISORY HEADLINE FOR THE OWENS VALLY.
&&

.PREV DISCUSSION...
255 PM PDT SAT AUG 30 2014

.SHORT TERM...THROUGH TUESDAY NIGHT...AN UPPER TROUGH WILL CONTINUE
MOVING ACROSS NORTHERN CALIFORNIA AND NORTHERN NEVADA TONIGHT. AN
EAST-WEST ORIENTED BAND OF HIGH CLOUDS ASSOCIATED WITH THIS SYSTEM
WAS STRETCHED ACROSS THE CENTER PART OF THE FORECAST AREA AND THESE
CLOUDS WILL GRADUALLY DECREASE THROUGH THE REST OF THE AFTERNOON AND
THIS EVENING. THE HI-RES MODELS CONTINUE TO INDICATE SOME POTENTIAL
FOR DOWNSLOPE WINDS THROUGH THIS EVENING ALONG THE EASTERN SIERRA
SLOPES INTO THE WESTERN PORTIONS OF THE OWENS VALLEY. THE WIND
SPEEDS INDICATED ARE LOW END ADVISORY LEVELS BUT WORTH KEEPING THE
ADVISORY IN EFFECT. A DRY NORTHWEST FLOW ALOFT WILL BE OVER THE AREA
BEHIND THE TROUGH LATER TONIGHT WHICH WILL TRANSITION TO A WESTERLY
THEN SOUTHWEST FLOW BY TUESDAY. THE RESULT WILL BE CONTINUED DRY
CONDITIONS WITH TEMPERATURES A LITTLE ABOVE NORMAL BUT NOT AS HOT AS
TODAY (SATURDAY).

.LONG TERM...WEDNESDAY THROUGH SATURDAY...BENIGN WEATHER EXPECTED
WEDNESDAY THROUGH FRIDAY AS THE REGION SITS BETWEEN HIGH PRESSURE TO
THE SOUTHEAST AND A TROUGH DRAPED ACROSS THE PACIFIC NORTHWEST. THIS
WILL KEEP TEMPERATURES CLOSE TO NORMAL ALONG WITH DRY CONDITIONS.
SOME LOCATIONS WILL LIKELY SEE SOME AFTERNOON BREEZY CONDITIONS EACH
DAY. THINGS GET A LITTLE MORE TRICKY FOR THE WEEKEND AS THE GFS AND
ECMWF DIFFER WITH REGARDS TO SOME SOUTHERLY MOISTURE ADVECTION. THE
ECMWF IS SHOWING A TROPICAL SYSTEM MOVING NORTH ALONG BAJA AND
STARTS TO EXPAND THE HIGH A LITTLE FURTHER WEST. THIS WOULD ALLOW
FOR MOISTURE TO BE DRAWN INTO NORTHWEST ARIZONA BY SATURDAY. THE GFS
DOES NOT SHOW THIS TROPICAL SYSTEM AND KEEPS THE HIGH FURTHER EAST
ALLOWING FOR THE SOUTHWEST FLOW TO BE STRONG ENOUGH TO KEEP THE DRY
AIR IN PLACE. I DID REMOVE THE POPS IN NORTHWEST ARIZONA THURSDAY
AND FRIDAY...BUT KEPT SOME SLIGHT CHANCE POPS FOR SATURDAY.
&&

.AVIATION...FOR MCCARRAN...SOUTH TO SOUTHWEST WINDS BETWEEN 10-20
KTS TO CONTINUE INTO THIS EVENING BEFORE SETTLING AROUND 10-12 KTS
OVERNIGHT. WINDS WILL BE LIGHTER SUNDAY AND ARE EXPECTED TO GO
NORTHEAST AFTER 16Z WITH SPEEDS AROUND 6-9 KTS. HIGH CLOUDS WILL
GRADUALLY DISSIPATE THIS EVENING WITH MAINLY MOSTLY CLEAR SKIES
THROUGH SUNDAY.

FOR THE REST OF SOUTHERN NEVADA...NORTHWEST ARIZONA...AND SOUTHEAST
CALIFORNIA...MOST AREAS WILL SEE SOUTHWEST TO WEST WINDS INTO THIS
EVENING AROUND 10-20 KTS THEN GRADUALLY DECREASING TO AROUND 10 KTS
OVERNIGHT. WINDS ARE EXPECTED TO BE LIGHTER SUNDAY EXPECT AREAS IN
NORTHERN ARIZONA WHERE SOUTHWEST WINDS WILL REMAIN 15-25 KTS. HIGH
CLOUDS WILL THIN TONIGHT WITH MOSTLY CLEAR SKIES THROUGH SUNDAY.
&&

.SPOTTER INFORMATION STATEMENT...SPOTTER ACTIVATION IS NOT EXPECTED
THROUGH THE WEEKEND.
&&

$$

UPDATE...PIERCE
HARRISON/GORELOW

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