Area Forecast Discussion
Issued by NWS Las Vegas, NV

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000
FXUS65 KVEF 300407
AFDVEF

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LAS VEGAS NV
906 PM PDT FRI AUG 29 2014

.SYNOPSIS...AN APPROACHING TROUGH OF LOW PRESSURE WILL INCREASE
WINDS ON SATURDAY AFTERNOON...ESPECIALLY IN THE LEE OF THE SIERRA. A
DRY NORTHWEST FLOW WILL THEN BE IN PLACE THROUGH LABOR DAY. SATURDAY
WILL BE THE HOTTEST DAY OF THE WEEKEND...THEN TEMPERATURES WILL COOL
A FEW DEGREES ON SUNDAY AND MONDAY...BUT REMAIN SLIGHTLY ABOVE THE
SEASONAL NORMALS.
&&

.UPDATE...A TROUGH WILL SWEEP ACROSS THE NORTHERN GREAT
BASIN/NORTHERN ROCKIES SATURDAY. SURFACE WINDS WILL INCREASE
SATURDAY AFTERNOON WITH POTENTIAL OF A MINOR DOWNSLOPE WIND EVENT
DEVELOPING IN THE LEE OF THE SOUTHERN SIERRA IN INYO COUNTY. A WIND
ADVISORY IS IN PLACE BETWEEN 2 PM AND 10 PM PDT. ELSEWHERE, WINDS
WILL REMAIN BELOW ADVISORY CRITERIA. HIGH CLOUDS WILL REMAIN
OVERHEAD INTO SATURDAY AFTERNOON BEFORE MODELS SHOWS AREA NARROWING
OR DISSIPATING. FORECAST LOOKS FINE.
&&

.PREV DISCUSSION...
238 PM PDT FRI AUG 29 2014

.SHORT TERM...LABOR DAY WEEKEND...TONIGHT THROUGH MONDAY.

THE MAIN WEATHER FEATURE WILL BE AN APPROACHING TROUGH OF LOW
PRESSURE...CURRENTLY LOCATED ALONG THE PACIFIC NORTHWEST COAST. THIS
TROUGH WILL MOVE INTO NORTHERN CALIFORNIA AND NORTHERN NEVADA ON
SATURDAY AFTERNOON...INCREASING WINDS ACROSS MUCH OF THE SOUTHERN
GREAT BASIN AND MOJAVE DESERT. THE MOST SIGNIFICANT WINDS AND
IMPACTS ARE EXPECTED IN THE FOOTHILLS OF THE EASTERN SIERRA WHERE
WIND GUSTS OF 40 TO 50 MPH ARE POSSIBLE SATURDAY AFTERNOON AND
EVENING. SOME STRONGER WIND GUSTS ARE ALSO LIKELY IN THE LEE OF THE
WHITE MOUNTAINS...BUT SHOULD BE LESS THAN 40 MPH. ALTHOUGH THE FLOW
ACROSS THE SIERRA IS NOT THAT STRONG...THE LOCAL HI-RES MODELS ARE
INDICATING THE POTENTIAL FOR BREAKING WAVES...ENHANCING THOSE WINDS
AS THEY DESCEND DOWN THE EASTERN SIERRA. TEMPERATURES ARE EXPECTED
TO BE A DEGREE OR TWO WARMER ON SATURDAY COMPARED TO TODAY IN MOST
LOCATIONS. VALUES WILL BE NEAR...BUT SLIGHTLY UNDER EXCESSIVE HEAT
LEVELS WHICH FOR THIS TIME OF YEAR IS 108 DEGREES. THE PASSAGE OF
TROUGH ON SUNDAY NIGHT WILL ACT TO COOL TEMPS A FEW DEGREES ON
SUNDAY AND REMAIN NEAR THOSE LEVELS ON LABOR DAY UNDER A DRY
NORTHWEST FLOW.

.LONG TERM...TUESDAY THROUGH FRIDAY.

MAINLY ZONAL FLOW IN PLACE ON TUESDAY...BUT AS THE NEXT TROUGH
APPROACHES THE WEST COAST THE FLOW WILL TURN MORE THE SOUTHWEST. BY
THURSDAY THE MODELS ARE TRYING TO TURN THE FLOW A BIT MORE SOUTHERLY
IN ARIZONA WHICH MAY BE ENOUGH TO PROVIDE A MODEST RETURN OF
MOISTURE TO MOHAVE COUNTY BY THURSDAY OR FRIDAY. OVERALL...A FAIRLY
QUIET WEATHER PATTERN WITH TEMPERATURES NEAR THE SEASON
NORMALS...WHICH IN THE LAS VEGAS AREA IS IN THE UPPER 90S.
&&

.AVIATION...FOR MCCARRAN...SOUTH TO SOUTHWEST WINDS AT 10 TO 12 KTS
ARE EXPECTED THROUGH TONIGHT. SOUTHWEST WINDS GUSTING AROUND 25 KTS
CAN BE EXPECTED SATURDAY AFTERNOON WITH JUST SOME HIGH LEVEL CLOUDS
AS A TROUGH MOVES ACROSS THE GREAT BASIN. LIGHT WINDS ARE EXPECTED
ON SUNDAY.

FOR THE REST OF SOUTHERN NEVADA...NORTHWEST ARIZONA...AND SOUTHEAST
CALIFORNIA...HIGH LEVEL CLOUDS ARE EXPECTED ACROSS THE GREAT BASIN
THROUGH SATURDAY AFTERNOON. SOUTHWEST WINDS GUSTING 20 TO 30 KNOTS
WILL OCCUR ACROSS MUCH OF THE REGION SATURDAY AFTERNOON AND EVENING
AS A TROUGH MOVES ACROSS THE GREAT BASIN. WIND GUSTS OF 40 TO 45 KTS
ARE POSSIBLE IN THE FOOTHILLS OF THE EASTERN SIERRA ON SATURDAY
AFTERNOON AND EVENING DUE TO DOWNSLOPE WINDS. OUR LOCAL HI
RESOLUTION MODELS ARE INDICATING THE POTENTIAL FOR BREAKING WAVES IN
THE EASTERN SIERRA SATURDAY AFTERNOON AND EVENING...STRONG TO SEVERE
TURBULENCE IS POSSIBLE.
&&

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

$$

UPDATE...PIERCE
CZYZYK

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