068  
FXUS65 KVEF 052001  
AFDVEF  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE LAS VEGAS NV  
101 PM PDT FRI SEP 5 2025  
   
KEY MESSAGES
 
 
* MONSOON MOISTURE WILL REMAIN IN PLACE THROUGH SUNDAY, PROMOTING  
SCATTERED AFTERNOON SHOWERS AND THUNDERSTORMS EACH DAY. ACTIVITY  
WILL GRADUALLY SHIFT EASTWARD AS DRIER AIR MOVES INTO THE  
REGION EARLY NEXT WEEK.  
 
* A DRYING TREND IS EXPECTED THE FIRST HALF OF THE WEEK AS FLOW  
BECOMES MORE WESTERLY. RELATIVELY COOLER TEMPERATURES WILL ALSO  
OVERSPREAD THE REGION BY MID WEEK.  
 

 
   
DISCUSSION
 
 
ANOMALOUSLY HIGH MOISTURE REMAINS ACROSS THE DESERT SOUTHWEST,  
TRAPPED BENEATH A FLATTENING AREA OF HIGH PRESSURE SITUATED OVER  
NORTHERN MEXICO. THIS COUPLED WITH DAYTIME HEATING AND OROGRAPHIC  
AND MESOSCALE INFLUENCES WILL CONTINUE TO PROMOTE SCATTERED  
SHOWERS AND THUNDERSTORMS THROUGH TONIGHT. AREAS OF CENTRAL AND  
SOUTHERN NEVADA, AND ADJACENT WESTERN ARIZONA LOOK TO HOLD THE  
GREATEST POTENTIAL FOR SHOWERS AND STORMS. HI-RES ENSEMBLES HAVE  
RECENTLY STRUGGLED WITH CONVECTIVE EVOLUTION INTO THE EVENING AND  
OVERNIGHT HOURS, OFTEN UNDERESTIMATING THE LONGEVITY AND INTENSITY  
OF SHOWERS AND STORMS. RECENT EXAMPLES INCLUDE TUESDAY EARLIER  
THIS WEEK AND LAST NIGHT, WHEN LARGE STORM COMPLEXES DEVELOPED AND  
LASTED WELL PAST SUNRISE. THE GRADUAL INVASION OF DRIER AIR MAKES  
FOR LESSER CONFIDENCE IN SOMETHING SIMILAR HAPPENING OVERNIGHT,  
BUT THERE REMAINS AT LEAST A 10-20 PERCENT CHANCE OF SOME KIND OF  
CONVECTIVE COMPLEX DEVELOPING ACROSS CENTRAL/SOUTHERN NEVADA AND  
SHIFTING SOUTH AND EAST OVERNIGHT. REGARDLESS, ANY STRONGER STORM  
CELLS WILL BE CAPABLE OF PRODUCING RAINFALL RATES OF 3-4 INCHES  
PER HOUR, LOCALIZED FLOODING AND GUSTY WINDS. THE FOCUS FOR  
SUNDAY'S STORMS WILL SHIFT EASTWARD INTO MOSTLY WESTERN ARIZONA  
AND UTAH AS UPPER FLOW BECOMES MORE WESTERLY IN NATURE. HOWEVER,  
AN ISOLATED TERRAIN INDUCED STORM OR TWO MAY OCCUR FURTHER WEST.  
 
MEDIUM TO LONG RANGE ENSEMBLES DISPLAY RATHER HIGH CONFIDENCE IN  
THE DEVELOPMENT OF A LARGE UPPER TROUGH OFF THE CALIFORNIA COAST.  
THIS WILL PUSH REMNANT MOISTURE EAST OF THE REGION, RESULTING IN  
DRIER CONDITIONS. WITH LOWER HEIGHTS, WE CAN ALSO EXPECT TO SEE  
TEMPERATURES AROUND 5-10 DEGREES BELOW SEASONAL NORMALS. THE DRIER  
AIR WILL ALSO BRING MORE RELIEF OVERNIGHT WITH PLEASANT MORNING  
CONDITIONS FROM MIDWEEK ON.  
 

 
   
AVIATION...FOR HARRY REID...FOR THE 18Z FORECAST PACKAGE
 
 
EAST TO NORTHEAST WINDS TO PERSIST INTO THE AFTERNOON HOURS WITH  
SPEEDS GENERALLY 15 KT OR LESS. LOW CONFIDENCE IN ISOLATED  
SHRA/TSRA FROM 21Z THROUGH 02Z. WHILE THESE MAY NOT DIRECTLY  
IMPACT THE TERMINAL, GUSTY OUTFLOWS MAY. WINDS TO EVENTUALLY  
BECOME SOUTHWESTERLY AFTER 00Z, THEN GRADUALLY SHIFT TO THE  
NORTHWEST/NORTH OVERNIGHT. OUTSIDE OF THUNDERSTORM OUTFLOWS, WINDS  
SHOULD GENERALLY REMAIN 10 KT OR LESS. TEMPERATURES TO REMAIN  
BELOW 100 DEGREES THROUGH THE PERIOD.  
 
FOR THE REST OF SOUTHERN NEVADA, NORTHWEST ARIZONA AND SOUTHEAST  
CALIFORNIA...FOR THE 18Z FORECAST PACKAGE...ANOTHER DAY OF  
ISOLATED SHOWERS/STORMS IS EXPECTED, WHICH COULD RESULT IN GUSTY  
OUTFLOWS AT ALL TERMINALS ASIDE FROM KBIH, WHERE DRIER CONDITIONS  
PERSIST. WINDS TO GENERALLY REMAIN EAST/SOUTHEAST INITIALLY,  
SHIFTING TO A MORE SOUTHERLY DIRECTION LATE THIS AFTERNOON INTO  
THE EVENING. WINDS WILL EVENTUALLY TAKE ON A MORE DIURNAL PATTERN  
OVERNIGHT EXCEPT WHERE ANY SHOWERS OR STORMS LINGER. KBIH WILL BE  
THE ONE EXCEPTION TO THIS, WHERE GUSTY UP-VALLEY BREEZES CAN BE  
EXPECTED THROUGH 00Z TO 03Z BEFORE SHIFTING BACK TO THE NORTHWEST.  
 

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

 
 

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