405  
FXUS65 KVEF 051056  
AFDVEF  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE LAS VEGAS NV  
256 AM PST THU DEC 5 2019  
   
SYNOPSIS
 
AREAS OF DENSE FOG WILL BURN OFF LATER THIS MORNING  
WITH DRY DAY IN STORE FOR THE REGION. INCREASING HIGH CLOUDS CAN  
BE EXPECTED TODAY AND FRIDAY AHEAD OF THE NEXT WEATHER SYSTEM  
WHICH WILL BRING ANOTHER ROUND OF RAIN AND MOUNTAIN SNOW MAINLY TO  
THE SIERRA AND SOUTHERN GREAT BASIN. DRY AND WARMER CONDITIONS ARE  
EXPECTED NEXT WEEK AS RIDGING BUILDS INTO THE REGION.  
 

 
   
SHORT TERM
 
THROUGH FRIDAY.  
 
UPPER LOW WHICH BROUGHT WIDESPREAD RAIN AND VERY HIGH ALTITUDE  
MOUNTAIN SNOWFALL WEDNESDAY HAS SHIFTED INTO SOUTHERN UTAH THIS  
MORNING. THE FOCUS NOW TURNS TO LINGERING LOW LEVEL MOISTURE WHICH  
HAS RESULTED IN POCKETS OF DENSE FOG. GOES FOG PRODUCT INDICATES  
EXTENSIVE LOW STRATUS/FOG LAYER BLANKETING MUCH OF INYO AND SAN  
BERNARDINO COUNTIES, WHERE REPORTS OF DENSE FOG IN THE MORONGO  
BASIN AND ALONG SR62 HAVE BEEN RECEIVED. ADDITIONAL DENSE FOG  
EXTENDS ACROSS MUCH OF SOUTHERN NEVADA, AND EVEN MOUNTAIN SPRINGS  
IN THE SPRING MOUNTAINS HAS BEEN OBSERVING DENSE FOG AT TIMES.  
PATCHY FOG IS ALSO EVIDENT ACROSS MOHAVE COUNTY WHERE VISIBILITY  
REDUCTIONS HAVE BEEN REPORTED ALONG US-93. WENT AHEAD AND ISSUED A  
BROAD DENSE FOG ADVISORY FOR THESE AREAS.  
 
MEANWHILE, DESPITE THE LINGERING LOW LEVEL MOISTURE, FOG HAS  
FAILED TO FORM ACROSS THE LAS VEGAS VALLEY AND THE SOUTHERN NV  
I-15 CORRIDOR THANKS TO SOME ELEVATED BREEZES OVERNIGHT. SOME  
PATCHY FOG MAY DEVELOP YET AS WINDS RELAX IN THE EARLY MORNING,  
AND I'LL CONTINUE TO MONITOR BUT IN THE MEANTIME I'VE LEFT THESE  
PARTS OF CLARK COUNTY OUT OF ANY FOG HEADLINES.  
 
AFTER THE FOG CLEARS THIS MORNING, EXPECT INCREASING HIGH CLOUDS  
AS YET ANOTHER TROUGH TAKES SHAPE OFF THE WEST COAST. THIS TROUGH  
WILL MOVE INTO OUR AREA FRIDAY NIGHT INTO SATURDAY AND WILL BE  
DISCUSSED FURTHER IN THE FOLLOWING SECTION.  
   
LONG TERM
 
SATURDAY THROUGH WEDNESDAY.  
 
ANOTHER PROGRESSIVE TROUGH WILL EDGE INTO THE REGION FRIDAY NIGHT  
INTO THE WEEKEND. UNLIKE THE PAST SEVERAL SYSTEMS, THIS STORM WILL  
MAINLY IMPACT THE SIERRA AND SOUTHERN GREAT BASIN. ADDITIONAL  
SNOW ACCUMULATIONS OF UP TO A FOOT MAY OCCUR IN THE SIERRA ABOVE  
8,000 FEET, THOUGH LIKELY FALLING OVER THE COURSE OF A COUPLE  
DAYS. ADDITIONAL HEADLINES MAY BE NEEDED LATER TODAY OR TOMORROW  
TO ACCOUNT FOR THIS. SPILLOVER PRECIPITATION INTO THE OWENS VALLEY  
OR THE TABOOSE BURN AREA LOOK FAIRLY LIGHT.  
 
BY NEXT WEEK, RIDGING WILL BEGIN TO BUILD ACROSS MUCH OF THE  
SOUTHWEST, ALLOWING FOR A MUCH DESERVED BREAK FROM THE ACTIVE  
WEATHER. DRY CONDITIONS ARE EXPECTED WITH TEMPERATURES NEAR TO  
SLIGHTLY ABOVE NORMAL. HOWEVER, WILL NEED TO WATCH FOR DEVELOPMENT  
OF SURFACE INVERSIONS WHICH COULD KEEP SOME VALLEYS COOLER THAN  
THE HEIGHT PATTERN WOULD SUGGEST.  
 

 
   
AVIATION...FOR MCCARRAN
 
CIGS SHOULD GENERALLY REMAIN BETWEEN 4-6K  
FEET THROUGH THE DAY WITH FAIRLY HIGH CONFIDENCE THERE WILL BE NO  
FOG AT THE TERMINAL THIS MORNING. SOUTHWEST WINDS 7-12 KNOTS SHOULD  
BEGIN TO DECREASE THROUGH THE EARLY MORNING HOURS THEN BECOMING  
LIGHT THROUGH THE PERIOD. SCT-BKN HIGH CLOUDS WILL MOVE OVER THE  
AREA TODAY BECOMING BKN-OVC AOA 20K FEET TONIGHT.  
 
FOR THE REST OF SOUTHERN NEVADA, NORTHWEST ARIZONA AND SOUTHEAST  
CALIFORNIA...AREAS OF FOG WITH REDUCED VISIBILITY WILL BE THE  
PRIMARY CONCERN THROUGH 17Z THIS MORNING. OTHERWISE, EXPECT BKN-OVC  
CLOUD DECKS BETWEEN 2-5K FEET THROUGH THE MORNING HOURS. LIGHT AND  
VARIABLE WINDS WITH INCREASING HIGH CLOUDS TODAY THAT WILL BECOME  
BKN-OVC AOA 20K FEET.  
 

 
   
SPOTTER INFORMATION STATEMENT
 
SPOTTERS ARE ENCOURAGED TO REPORT  
DENSE FOG AND LOW VISIBILITY THIS MORNING.  
 

 
 

 
 
DISCUSSION...OUTLER  
AVIATION...SALMEN  
 
FOR MORE FORECAST INFORMATION...SEE US ON OUR WEBPAGE:  
HTTPS://WEATHER.GOV/LASVEGAS OR FOLLOW US ON FACEBOOK AND TWITTER  
 
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