312  
FXUS65 KVEF 300846  
AFDVEF  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE LAS VEGAS NV  
146 AM PDT FRI MAY 30 2025  
   
SYNOPSIS
 
ABOVE AVERAGE TEMPERATURES PERSIST AND AN EXTREME HEAT  
WARNING WILL BE IN EFFECT TODAY AND TOMORROW FOR SECTIONS OF THE  
MOJAVE DESERT. TROPICAL MOISTURE BRINGS INCREASED CLOUD COVER,  
PRECIPITATION POTENTIAL, AND COOLER TEMPERATURES EARLY NEXT WEEK.  
THE GREATEST PRECIPITATION AMOUNTS APPEAR TO BE IN NORTHWESTERN  
ARIZONA ON SUNDAY.  
 

 
   
SHORT TERM
 
THROUGH SATURDAY.  
 
THE MAIN CONCERN IN THE SHORT TERM IS HEAT. AN UPPER LEVEL RIDGE  
BUILDS OVER THE SOUTHWESTERN UNITED STATES WHILE A LOW REMAINS  
ENTRENCHED TO THE SOUTH OVER BAJA CALIFORNIA. RISING HEIGHTS ALOFT  
WILL HELP DRIVE UP TEMPERATURES AT THE SURFACE WITH HIGHS BETWEEN 5  
AND 10 DEGREES ABOVE AVERAGE TODAY AND TOMORROW. WARM OVERNIGHT  
TEMPERATURES CAN ALSO BE EXPECTED, PARTICULARLY ON SATURDAY NIGHT AS  
CLOUD COVER PREVENTS OVERNIGHT RADIATIVE COOLING. BOTH DAILY MAXIMUM  
TEMPERATURE RECORDS AND WARM MINIMUM TEMPERATURE RECORDS ARE  
THREATENED EACH DAY. SEE THE CLIMATE SECTION BELOW FOR MORE  
INFORMATION ON POTENTIAL BROKEN DAILY TEMPERATURE RECORDS.  
 
MODERATE (LEVEL 2) TO MAJOR (LEVEL 3) HEATRISK IS WIDESPREAD ACROSS  
THE MOJAVE DESERT, A LEVEL OF HEAT THAT IS DANGEROUS TO THOSE  
WITHOUT EFFECTIVE COOLING OR ADEQUATE HYDRATION. AN EXTREME HEAT  
WARNING IS IN EFFECT FOR AREAS INCLUDING LAS VEGAS, PAHRUMP, LAKE  
MEAD, DEATH VALLEY, AND BARSTOW TODAY AND TOMORROW.  
   
LONG TERM
 
SUNDAY THROUGH FRIDAY.  
 
A CUT OFF AREA OF LOW PRESSURE OFF THE BAJA CALIFORNIA COAST WILL  
CONTINUE TO MEANDER AROUND THAT VICINITY OVER THE NEXT FEW DAYS,  
ALLOWING IT TO PICK UP SUBSTANTIAL MOISTURE BEFORE PUSHING INLAND  
THIS WEEKEND. MEANWHILE, TROPICAL DEPRESSION ONE-E HAS BEEN UPGRADED  
TO TROPICAL STORM ALVIN AND WILL SLOWLY PUSH NORTHWARD ALONG THE  
WESTERN MEXICO COAST BEFORE WEAKENING BACK INTO A TROPICAL  
DEPRESSION AND PUSHING INTO THE GULF OF CALIFORNIA.  
 
IN GENERAL, FORCING ASSOCIATED WITH THIS TROPICAL SYSTEM SHOULD HAVE  
MINIMAL IMPACT TO OUR FORECAST AREA, BUT MID-AND-UPPER LEVEL  
MOISTURE ASSOCIATED WITH ITS REMNANTS WILL GET WRAPPED INTO THE BAJA  
LOW AS IT MOVES INLAND LATE THIS WEEKEND INTO THE START OF NEXT  
WEEK. THE COMBINED MOISTURE SURGE FROM THESE TWO SYSTEMS WILL RESULT  
IN PWATS ACROSS THE EASTERN HALF OF OUR FORECAST AREA TO 250-300  
PERCENT OF NORMAL. EXPECT WIDESPREAD SLIGHT-TO-MODERATE CHANCES OF  
PRECIPITATION ON SUNDAY, WITH MODERATE-TO-HIGH CHANCES FOCUSED SOUTH  
AND EAST OF INTERSTATE 15. THERE REMAINS A BIT OF UNCERTAINTY  
REGARDING HOW CONVECTIVE THIS PRECIPITATION WILL BE, AS REMNANT MID-  
TO-UPPER LEVEL MOISTURE FROM TROPICAL STORM ALVIN COULD RESULT IN  
WIDESPREAD THICK CLOUD COVER, INHIBITING CONVECTIVE POTENTIAL. THIS  
MOISTURE WILL HELP DROP TEMPERATURES OUT OF THE 100S FOR DESERT  
VALLEYS AND INTO THE LOW-TO-MID 90S (BELOW-NORMAL).  
 
WHAT ORIGINALLY WAS THOUGHT TO BE A DEEP DIGGING TROUGH ALONG THE  
WESTERN CONUS MONDAY AND TUESDAY HAS TRENDED SUBSTANTIALLY WEAKER  
OVER THE LAST 48 HOURS. MODELS ARE IN BETTER CONSENSUS NOW THAT A  
TROUGH WILL DROP DOWN THE WEST COAST BEFORE CLOSING OFF IN THE  
SOUTHEASTERN PACIFIC. THIS AREA OF LOW PRESSURE WILL THEN MOVE  
INLAND WITH A SIMILAR TRAJECTORY AS THE BAJA LOW. THIS LOW WILL  
PROVIDE ADDITIONAL MOISTURE AND LIFT TO THE REGION WHILE ALSO  
TAPPING INTO THE LEFT OVER MOISTURE FROM ITS PREDECESSOR. AS SUCH,  
PRECIPITATION CHANCES FOR OUR EASTERN ZONES NOW LINGER LATER INTO  
THE WEEK, WITH SLIGHT POPS PERSISTING AS LATE AS WEDNESDAY. THIS  
CHANGE HAS RESULTED IN A CONTINUED WEAKER TREND IN FORECAST WIND  
SPEEDS THROUGH THE WEEK DUE TO THE EASE IN FORECAST PRESSURE  
GRADIENTS. ADDITIONALLY, THE DROP IN HEIGHTS THAT WAS ANTICIPATED  
FROM THE DEEP DIGGING TROUGH WILL NO LONGER OCCUR, SO EXPECT ONLY A  
MODEST DROP IN TEMPERATURES EARLY-TO-MID WEEK FROM THE INCREASE OF  
MOISTURE TO THE REGION.  
 

 
   
AVIATION...FOR HARRY REID...FOR THE 06Z FORECAST PACKAGE
 
LIGHT  
SOUTHWESTERLY WINDS WILL CONTINUE THROUGH THE NIGHT BEFORE BECOMING  
VARIABLE AFTER DAYBREAK. A PERIOD OF EAST TO SOUTHEAST WINDS IS  
POSSIBLE ONCE AGAIN TOMORROW AFTERNOON. WHILE ALL GUIDANCE  
MAINTAINS SUSTAINED SPEEDS BELOW 8 KNOTS, A FEW THERMALLY DRIVEN  
GUSTS OF UP TO 15 KNOTS ARE POSSIBLE DURING THE LATE AFTERNOON AND  
EVENING. WINDS SHOULD RETURN TO THE TYPICAL SOUTHWEST DIRECTION  
AROUND SUNSET. VFR CONDITIONS WILL PREVAIL THROUGH THE TAF PERIOD  
WITH ANY BASES REMAINING AOA 15KFT AGL. TEMPERATURES ARE EXPECTED  
TO EXCEED 100 DEGREES FROM ROUGHLY 21Z TO 03Z, WITH A MAXIMUM VALUE  
OF 103 DEGREES AROUND 23Z.  
 
FOR THE REST OF SOUTHERN NEVADA, NORTHWEST ARIZONA AND SOUTHEAST  
CALIFORNIA...FOR THE 06Z FORECAST PACKAGE...CONDITIONS AT THE LAS  
VEGAS AREA TAF SITES WILL BE SIMILAR TO THOSE DESCRIBED FOR HARRY  
REID, EXCEPT WIND SPEEDS TOMORROW EVENING MAY BE A FEW KNOTS HIGHER  
AT KHND. ELSEWHERE, WINDS WILL FOLLOW TYPICAL DIURNAL PATTERNS WITH  
SPEEDS GENERALLY REMAINING 10 KNOTS OR LESS. VFR CONDITIONS WILL  
PREVAIL WITH CLOUD BASES AOA 12KFT AGL THROUGH THE TAF PERIOD.
 
 

 
   
CLIMATE
 
NUMEROUS CLIMATE LOCATIONS HAVE A FORECAST HIGH  
TEMPERATURE AND/OR FORECAST WARM LOW TEMPERATURE WITHIN 3 DEGREES OF  
THE DAILY RECORD.  
 
THE TABLE BELOW SHOWS THE DAILY RECORD MAXIMUM TEMPERATURE AND THE  
YEAR THE RECORD WAS LAST SET. AN ASTERISK (*) DENOTES WHICH RECORDS  
ARE IN JEOPARDY (WITHIN 3 DEGREES OF THE FORECAST).  
 
MAX FRI, MAY 30 SAT, MAY 31  
RECORD(YR) RECORD(YR)  
 
LAS VEGAS 106(2002)* 104(2024)*  
BISHOP 100(1986)* 99(1950)*  
NEEDLES 114(1910) 116(1910)  
DAGGETT 106(1997) 106(2001)*  
KINGMAN 102(1984) 100(1938)*  
DESERT ROCK 102(2002)* 100(2012)*  
DEATH VALLEY 122(2000) 118(2002)*  
 
THE TABLE BELOW SHOWS THE DAILY RECORD WARM MINIMUM TEMPERATURE AND  
THE YEAR THE RECORD WAS LAST SET. AN ASTERISK (*) DENOTES WHICH  
RECORDS ARE IN JEOPARDY (WITHIN 3 DEGREES OF THE FORECAST).  
 
WARM MIN FRI, MAY 30 SAT, MAY 31  
RECORD(YR) RECORD(YR)  
 
LAS VEGAS 83(2003) 82(1997)*  
BISHOP 60(2001) 60(2013)*  
NEEDLES 90(1984) 84(2004)  
DAGGETT 83(1984) 78(1972)  
KINGMAN 76(1984) 71(1997)*  
DESERT ROCK 79(2003) 77(1997)  
DEATH VALLEY 94(2003) 91(2001)*  
 

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

 
 

 
 
SHORT TERM...MELTZER  
LONG TERM...SOULAT  
AVIATION...PLANZ  
 
FOR MORE FORECAST INFORMATION...SEE US ON OUR WEBPAGE:  
HTTPS://WEATHER.GOV/LASVEGAS OR FOLLOW US ON FACEBOOK AND TWITTER  
 
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