463  
FXUS65 KVEF 152158  
AFDVEF  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE LAS VEGAS NV  
215 PM PDT SUN SEP 15 2019  
   
SYNOPSIS
 
A LOW PRESSURE SYSTEM DROPPING DOWN FROM THE  
PACIFIC NORTHWEST WILL MOVE ACROSS THE SOUTHERN SIERRA AND GREAT  
BASIN ON MONDAY BRINGING WINDY CONDITIONS AND SIGNIFICANTLY COOLER  
TEMPERATURES BY TUESDAY. ANOTHER WEATHER SYSTEM WILL FOLLOW A  
SIMILAR TRACK AND BRING MORE WIND TO THE REGION WEDNESDAY THROUGH  
FRIDAY.  

 
   
DISCUSSION
 
THROUGH NEXT SUNDAY.  
 
INCREASING WINDS WILL BE THE MAIN WEATHER CONCERN THROUGH MONDAY  
EVENING AS A PACIFIC NORTHWEST TROUGH SLOWLY DIGS DOWN THE COAST  
TONIGHT THEN SWINGS INLAND ACROSS NORTHERN CALIFORNIA AND NORTHERN  
NEVADA MONDAY. THERE WILL ALSO BE LIMITED MOISTURE AND INSTABILITY  
OVER EASTERN MOHAVE COUNTY FOR A SLIGHT CHANCE OF  
AFTERNOON THUNDERSTORMS THROUGH MONDAY.  
 
CONDITIONS WILL STILL BE FAVORABLE IN THE SOUTHERN SIERRA AND OWENS  
VALLEY FOR PERIODS OF STRONG DOWNSLOPE WINDS THOUGH THE LATEST HIGH  
RESOLUTION MODELS HAVE TRENDED DOWNWARD SLIGHTLY WITH WIND SPEEDS.  
GUSTS OF 35 TO 45 MPH APPEAR LIKELY THIS EVENING AND OVERNIGHT,  
PRIMARILY IN THE FOOTHILLS WEST OF HIGHWAY 395, THEN WINDS SHOULD BE  
CONFINED TO THE MID AND UPPER SLOPES MONDAY MORNING THROUGH EARLY  
AFTERNOON. THIS WILL BE FOLLOWED BY FAVORABLE STRONG DOWNSLOPE  
CONDITIONS AS THE TROUGH AXIS AND COLD FRONT MOVE OVER THE REGION  
LATE AFTERNOON THROUGH THE EVENING WHERE GUSTS WILL LIKELY PUSH  
ACROSS AREAS OF HIGHWAY 395...ESPECIALLY BETWEEN 5 PM AND 9 PM. IT  
APPEARS GUSTS OF 40 TO 50 MPH WILL BE LIKELY AND A WIND ADVISORY WAS  
ISSUED TO REPLACE THE HIGH WIND WATCH FROM 2 PM MONDAY AFTERNOON  
UNTIL 9 PM MONDAY EVENING.  
 
ELSEWHERE ACROSS THE REGION, THE BELT OF STRONGEST SOUTHWEST WINDS  
WILL SET UP ACROSS SOUTHERN/CENTRAL NYE AND LINCOLN COUNTIES LATE  
MONDAY MORNING THROUGH EARLY MONDAY EVENING AND A WIND ADVISORY HAS  
BEEN ISSUED FROM 2 PM MONDAY AFTERNOON UNTIL 9 PM MONDAY EVENING FOR  
ZONES NORTH OF THE LAS VEGAS VALLEY. GUSTS IN THE SPRING MOUNTAINS  
AND SHEEP RANGE ON EXPOSED RIDGES ABOVE 7000 FEET OF 40 TO 50 MPH  
CAN BE EXPECTED, BUT RED ROCK CANYON, THE LAS VEGAS VALLEY AND AREAS  
TO THE SOUTH WILL LIKELY SEE GUSTS GENERALLY IN THE 30-35 MPH RANGE  
MONDAY AND IMPACTS SHOULD BE MINIMAL.  
 
WINDS WILL DIMINISH MONDAY NIGHT AND REMAIN FAIRLY LIGHT TUESDAY  
BEHIND THE SYSTEM LIFTING AWAY TO THE NORTHEAST. ANOTHER TROUGH IS  
THEN FORECAST TO DROP DOWN FROM THE PACIFIC NORTHWEST INTO CENTRAL  
AND SOUTHERN NEVADA LATE WEDNESDAY THROUGH THURSDAY BEFORE LIFTING  
AWAY FRIDAY LEAVING A WEAK ZONAL PATTERN IN PLACE GOING INTO NEXT  
WEEK WITH YET ANOTHER UPSTREAM TROUGH POSSIBLY BRUSHING OUR REGION  
LATE SUNDAY. THIS PATTERN WILL KEEP BREEZY PERIODS WITH TEMPERATURES  
NEAR OR SLIGHTLY BELOW NORMAL.  

 
   
AVIATION...FOR MCCARRAN
 
AFTER A BRIEF LULL IN WINDS TONIGHT,  
SOUTHWEST WINDS WILL BEGIN INCREASING SHORTLY AFTER DAYBREAK ON  
MONDAY, AND CONTINUE INCREASING THROUGH THE AFTERNOON WITH A FEW  
GUSTS TO 30 KTS POSSIBLE. THE THICKEST CLOUDS WILL ARRIVE TONIGHT  
AND BEGIN TO THIN TOMORROW, BUT CEILINGS ARE EXPECTED TO REMAIN  
ABOVE 15 KFT. ALONG WITH THE GUSTY WINDS, A FEW ELEVATED SHOWERS MAY  
TRY TO DEVELOP, ENHANCING TURBULENCE POTENTIAL, THOUGH ANY RAIN IS  
NOT LIKELY TO IMPACT THE TERMINAL. WINDS WILL QUICKLY DECREASE, BUT  
REMAIN SOUTHWEST AFTER SUNSET MONDAY EVENING.  
 
FOR THE REST OF SOUTHERN NEVADA, NORTHWEST ARIZONA AND SOUTHEAST  
CALIFORNIA...SOUTHWEST WINDS WILL INCREASE FOR ALL TERMINALS FOR  
MONDAY. STRONG SURFACE WINDS WILL FOSTER TURBULENCE AND LOW-LEVEL  
WIND SHEAR HAZARDS ACROSS MUCH OF THE AREA AS WELL AS MOUNTAIN WAVE  
ACTION IN THE OWENS VALLEY. A FEW THUNDERSTORMS MAY DEVELOP IN  
NORTHWEST ARIZONA, WITH ELEVATED SHOWERS ELSEWHERE, BUT  
PRECIPITATION IS NOT ANTICIPATED TO REACH THE GROUND, AND CEILINGS  
SHOULD REMAIN AT OR ABOVE 15 KFT. WINDS WILL BEGIN TO QUICKLY  
SUBSIDE AFTER SUNSET MONDAY EVENING.  

 
   
FIRE WEATHER
 
A STRONG LOW PRESSURE SYSTEM WILL BRING GUSTY WINDS  
TO INYO COUNTY TONIGHT THEN SPREADING ACROSS MOST OF SOUTHERN NEVADA  
MONDAY. A RED FLAG WARNING IS IN EFFECT FOR INYO COUNTY CALIFORNIA  
ZONES FROM UNTIL 9 PM PDT MONDAY. A RED FLAG WARNING IS IN EFFECT  
FOR THE SOUTHERN NEVADA ZONES FROM 11 AM MONDAY MORNING UNTIL 9 PM  
PDT MONDAY EVENING. A BELT OF STRONG SOUTHWEST WINDS GUSTING 35 TO  
45 MPH IS FORECAST FOR THE SOUTHERN GREAT BASIN. THESE STRONG WINDS  
WILL BE ACCOMPANIED BY MINIMUM RH VALUES IN THE SINGLE-DIGITS TO  
LOWER-TEENS. WINDS WILL DECREASE MONDAY NIGHT THROUGH TUESDAY THEN  
ANOTHER TROUGH WILL INCREASE WINDS ACROSS THE REGION LATE WEDNESDAY  
THROUGH FRIDAY.  

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

 
 

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