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 FOR MORE FORECAST INFORMATION...SEE US ON OUR WEBPAGE: HTTP://WEATHER.GOV/LASVEGAS OR FOLLOW US ON FACEBOOK AND TWITTER

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