839  
FXUS65 KVEF 220901  
AFDVEF  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE LAS VEGAS NV  
201 AM PDT SAT SEP 22 2018  
   
SYNOPSIS
 
DRY CONDITIONS WILL PREVAIL THROUGH THE MIDDLE OF THE  
UPCOMING WEEK, AND TEMPERATURES WILL REMAIN SEVERAL DEGREES ABOVE  
NORMAL.  

 
   
SHORT TERM
 
THROUGH MONDAY NIGHT. NO CHANGE IN THINKING FROM  
PREVIOUS MORNINGS. SATELLITE SHOWED MOSTLY CLEAR SKIES EARLY THIS  
MORNING, AND EXPECT ONLY SOME PASSING CIRRUS AND A FEW FLAT  
AFTERNOON CUMULUS THROUGH MONDAY. A TROUGH OF LOW PRESSURE MOVING  
INTO THE PACIFIC NORTHWEST TODAY AND SWINGING INTO THE INTERMOUNTAIN  
WEST SUNDAY WILL KICK UP SOME BREEZY SOUTH TO SOUTHWEST WINDS IN THE  
AFTERNOONS. WINDS SHOULD STAY BELOW WIND ADVISORY AND RED FLAG  
WARNING CRITERIA, EVEN ON SUNDAY, WHEN THE STRONGEST WINDS ARE  
EXPECTED. THE BREEZES ON SATURDAY AND SUNDAY WILL PROMOTE DEEP  
MIXING, HELPING TO KEEP TEMPERATURES SEVERAL DEGREES ABOVE NORMAL  
FOR LATE SEPTEMBER. ON MONDAY, AFTER THE TROUGH HAS MOVED AWAY TO  
THE EAST, GRADIENTS WILL RELAX SO WINDS WILL SETTLE DOWN, AND  
SLIGHTLY LESS WARM AIR IN THE WAKE OF THE TROUGH WILL BRING  
TEMPERATURES DOWN A COUPLE OF DEGREES.  
   
LONG TERM
 
TUESDAY THROUGH FRIDAY.  
THE LONG TERM PERIOD REMAINS DRY WITH TEMPS RUNNING 5-10 DEGREES  
ABOVE SEASONAL NORMS. LARGE-SCALE TROUGHING REMAINS SITUATED TO OUR  
EAST OVER THE CENTRAL U.S. ON TUESDAY WITH PREVAILING NORTH TO  
NORTHWESTERLY FLOW OVER THE AREA. WEAK RIDGING WILL BUILD IN FOR  
WEDNESDAY AND THURSDAY AS A BLOCKING PATTERN SETS UP OFF OF THE WEST  
COAST. ON FRIDAY, A SECONDARY TROUGH BEGINS TO DIG SOUTHWARD OVER  
THE PACIFIC NORTHWEST WHICH WILL CAUSE WINDS TO BECOME BREEZY FRIDAY  
AFTERNOON AS THE LOCAL PRESSURE GRADIENT BECOMES TIGHTER.  

 
   
AVIATION...FOR MCCARRAN
 
SOUTHWEST WINDS WILL CONTINUE THROUGH  
SUNRISE AT SPEEDS OF 8 KNOTS OR LESS. LIGHT AND VARIABLE WINDS WILL  
FAVOR THE NORTHEAST DIRECTION MID MORNING BEFORE WINDS INCREASE OUT  
OF THE SOUTH BETWEEN 19Z-21Z. WINDS WILL BECOME GUSTY WITH SPEEDS OF  
10-12 KNOTS GUSTING 18-23 KNOTS THOUGH AROUND SUNSET. AFTER SUNSET,  
GUSTS WILL TAPER OFF AND SPEEDS COME DOWN TO AROUND 10 KNOTS THROUGH  
EARLY SUNDAY MORNING.  
 
FOR THE REST OF SOUTHERN NEVADA, NORTHWEST ARIZONA AND SOUTHEAST  
CALIFORNIA...WINDS WILL REMAIN LIGHT AND FAVOR DIURNAL TRENDS  
THROUGH EARLY AFTERNOON WHEN AN INCREASE IN SPEED AND SHIFT TO THE  
SOUTH TO SOUTHWEST IS EXPECTED. SPEEDS THIS AFTERNOON WILL REMAIN  
BETWEEN 8-12 KNOTS WITH GUSTS AROUND 20-22 KNOTS FOR MOST AREAS  
THROUGH SUNSET. GUSTS UP TO 25-30 KNOTS WILL BE POSSIBLE OVER THE  
SOUTHERN GREAT BASIN. AFTER SUNSET, WINDS WILL COME DOWN TO 10 KNOTS  
OR LESS AS GUSTS TAPER OFF.  

 
   
SPOTTER INFORMATION STATEMENT
 
SPOTTERS ARE ENCOURAGED TO REPORT  
ANY SIGNIFICANT WEATHER OR IMPACTS ACCORDING TO STANDARD OPERATING  
PROCEDURES.  

 
 

 
 
SHORT TERM/AVIATION...MORGAN  
LONG TERM...GUILLET  
 
FOR MORE FORECAST INFORMATION...SEE US ON OUR WEBPAGE:  
HTTP://WEATHER.GOV/LASVEGAS OR FOLLOW US ON FACEBOOK AND TWITTER  
 
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