580  
FXUS65 KVEF 211645  
AFDVEF  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE LAS VEGAS NV  
945 AM PDT THU OCT 21 2021  
   
SYNOPSIS
 
NORMAL TEMPERATURES EXPECTED THROUGH SATURDAY WITH  
OCCASIONAL PASSING HIGH CLOUDS. A PACIFIC SYSTEM WILL BRING  
SIGNIFICANT PRECIPITATION TO THE SOUTHERN SIERRA LATE THIS WEEKEND  
AND POTENTIAL WET WEATHER AND GUSTY WINDS TO MUCH OF OUR REGION  
EARLY NEXT WEEK.  

 
   
UPDATE
 
THE LATEST OBSERVATIONS AND MODEL ENSEMBLES SUPPORT THE  
FORECAST TRENDS DETAILED IN THE PREVIOUS DISCUSSION AND NO IMMEDIATE  
CHANGES ARE NEEDED.  

 
   
PREV DISCUSSION
 
1246 AM PDT  
   
SHORT TERM
 
THROUGH FRIDAY NIGHT.  
 
HEIGHTS FORECAST TO RISE ACROSS THE INTERMOUNTAIN WEST TODAY AS NEXT  
IN THE SERIES OFF THE PACIFIC SYSTEMS DEEPENS OFF THE PAC NW COAST.  
EVEN UNDER PERIODS OF HIGH CLOUDS TEMPERATURES WILL WARM EACH DAY  
TOPPING OUT AROUND NORMAL. HEAVIER PRECIPITATION WITH THE SYSTEM  
WILL STAY WELL NORTH OF INYO COUNTY THROUGH FRIDAY. THERE MAY BE  
SOME LIGHT PRECIPITATION SPILLING OVER THE CREST FRIDAY NIGHT AS THE  
WEAKENING FRONTAL BAND REACHES THE SOUTHERN SIERRA. LOCALLY BREEZY  
FRIDAY, ESPECIALLY WITHIN A BELT OF SOUTH-SOUTHWEST WINDS RUNNING  
FROM NORTHWEST SAN BERNARDINO COUNTY NORTH THROUGH INYO, ESMERALDA  
AND NYE COUNTIES.  
   
LONG TERM
 
SATURDAY THROUGH WEDNESDAY.  
 
ALL EYES WILL BE ON THE EASTERN PACIFIC WE HEAD INTO THE LONG TERM  
PERIOD, AS THE WEST COAST WILL REMAIN POISED FOR A SERIES OF WET  
WEATHER SYSTEMS MOVING THROUGH. ON SATURDAY OUR REGION WILL BE UNDER  
A GENERALLY ZONAL FLOW ALOFT WITH FAIR CONDITIONS ASIDE FROM  
PERIODIC MID AND HIGH CLOUD COVER. HIGH PRESSURE RIDGING BRIEFLY  
BUILDS IN ON SUNDAY AS DEEP TROUGHING NUDGES CLOSER TO THE WEST  
COAST. THIS WILL RESULT IN THE WARMEST TEMPERATURES OF THE WEEK  
BEFORE HEIGHTS TUMBLE ON MONDAY.  
 
AFOREMENTIONED PACIFIC TROUGH WILL CRASH INTO THE PACIFIC COAST ON  
MONDAY, AIMING A POWERFUL PACIFIC JET AT THE SOUTH SIERRA. THIS WILL  
BRING SIGNIFICANT HIGH MOUNTAIN SNOWFALL TO THE SIERRA, MAINLY ABOVE  
8,500 FEET, WITH HEAVY SPILLOVER PRECIPITATION LIKELY FALLING INTO  
THE OWENS VALLEY AND BISHOP REGIONS. AS THE TROUGH PUSHES INLAND,  
PRECIP CHANCES WILL SPREAD EASTWARD ACROSS THE MOJAVE DESERT AND  
SOUTHERN GREAT BASIN, WITH THE HIGHER TERRAIN PICKING UP THE BRUNT  
OF ADDITIONAL PRECIP, WHILE THE DESERT VALLEYS SQUEEZE OUT SOME  
LIGHTER TOTALS. ADDITIONALLY, GUSTY WINDS WILL OVERSPREAD THE REGION  
WHICH MAY RESULT IN THE NEED FOR SOME WIND HEADLINES DOWN THE ROAD.  
 
FOLLOWING THE PARADE OF WEATHER SYSTEMS THIS WEEK, CLUSTER GUIDANCE  
IS IN RATHER STRONG AGREEMENT THAT A BROAD AND HIGH AMPLITUDE RIDGE  
OF HIGH PRESSURE WILL BUILD IN MIDWEEK WHICH SHOULD ENCOURAGE DRIER  
AND WARMER CONDITIONS TO FINISH OFF WHAT WAS OTHERWISE A COOL AND  
UNSETTLED OCTOBER.  

 
   
AVIATION...FOR MCCARRAN
 
WINDS WILL BE LIGHT AND DIURNAL, WITH  
LIGHT NORTHEAST WINDS THROUGH THE MORNING, BRIEFLY SHIFTING TO  
SOUTHEAST IN THE AFTERNOON, AND BECOMING SOUTHWEST IN THE EVENING  
AND OVERNIGHT. WINDS WILL REMAIN BELOW 10 KTS WITH BROKEN HIGH  
CLOUDS.  
 
FOR THE REST OF SOUTHERN NEVADA, NORTHWEST ARIZONA, AND SOUTHEAST  
CALIFORNIA...LIGHT AND DIURNAL WINDS EXPECTED AREAWIDE. WINDS WILL  
REMAIN BELOW 15 KTS WITH BROKEN HIGH CLOUDS.  

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

 
 

 
 
SHORT TERM...PIERCE  
LONG TERM...OUTLER  
AVIATION...VARIAN  
 
FOR MORE FORECAST INFORMATION...SEE US ON OUR WEBPAGE:  
HTTPS://WEATHER.GOV/LASVEGAS OR FOLLOW US ON FACEBOOK AND TWITTER  
 
CLICK HERE TO GO TO PREVIOUS BULLETINS.

The Nexlab NV Page
The Nexlab AZ Page
The Nexlab CA Page Main Text Page