928  
FNUS86 KSGX 211244  
FWLSGX  
 
ECCDA DISCUSSIONS  
NATIONAL WEATHER SERVICE SAN DIEGO CA  
544 AM PDT THU AUG 21 2025  
 
ECC033-220645-  
ORANGE ECC DISPATCH-  
DISCUSSION FOR ORANGE ECC DISPATCH  
544 AM PDT THU AUG 21 2025  
 
THE HEAT IS EXPECTED TO PEAK FOR MOST AREAS TODAY AND FRIDAY WITH  
SLIGHT COOLING FOR THE WEEKEND AND CONTINUED COOLING EARLY NEXT WEEK  
TO AROUND AVERAGE FOR THE MIDDLE OF NEXT WEEK. MONSOONAL MOISTURE  
WILL INCREASE INTO THE WEEKEND WITH INCREASING CHANCES FOR SHOWERS  
AND THUNDERSTORMS OVER THE WEEKEND, MOST LIKELY DURING THE  
AFTERNOON AND EARLY EVENING, AND MOSTLY FOR THE MOUNTAINS AND  
DESERTS. THERE WILL BE GRADUAL DRYING OF THE MONSOONAL MOISTURE FOR  
THE MIDDLE AND LATTER PART OF NEXT WEEK WITH DECREASING CHANCES FOR  
SHOWERS AND THUNDERSTORMS.  
 

 
 
ECC035-220645-  
MONTE VISTA ECC DISPATCH-  
544 AM PDT THU AUG 21 2025  
 
THE HEAT IS EXPECTED TO PEAK FOR MOST AREAS TODAY AND FRIDAY WITH  
SLIGHT COOLING FOR THE WEEKEND AND CONTINUED COOLING EARLY NEXT WEEK  
TO AROUND AVERAGE FOR THE MIDDLE OF NEXT WEEK. MONSOONAL MOISTURE  
WILL INCREASE INTO THE WEEKEND WITH INCREASING CHANCES FOR SHOWERS  
AND THUNDERSTORMS OVER THE WEEKEND, MOST LIKELY DURING THE  
AFTERNOON AND EARLY EVENING, AND MOSTLY FOR THE MOUNTAINS AND  
DESERTS. THERE WILL BE GRADUAL DRYING OF THE MONSOONAL MOISTURE FOR  
THE MIDDLE AND LATTER PART OF NEXT WEEK WITH DECREASING CHANCES FOR  
SHOWERS AND THUNDERSTORMS.  
 

 
 
ECC034-220645-  
RIVERSIDE ECC DISPATCH-  
544 AM PDT THU AUG 21 2025  
   
..DISCUSSION FROM LAXFWFSGX
 
 
THE HEAT IS EXPECTED TO PEAK FOR MOST AREAS TODAY AND FRIDAY WITH  
SLIGHT COOLING FOR THE WEEKEND AND CONTINUED COOLING EARLY NEXT WEEK  
TO AROUND AVERAGE FOR THE MIDDLE OF NEXT WEEK. MONSOONAL MOISTURE  
WILL INCREASE INTO THE WEEKEND WITH INCREASING CHANCES FOR SHOWERS  
AND THUNDERSTORMS OVER THE WEEKEND, MOST LIKELY DURING THE  
AFTERNOON AND EARLY EVENING, AND MOSTLY FOR THE MOUNTAINS AND  
DESERTS. THERE WILL BE GRADUAL DRYING OF THE MONSOONAL MOISTURE FOR  
THE MIDDLE AND LATTER PART OF NEXT WEEK WITH DECREASING CHANCES FOR  
SHOWERS AND THUNDERSTORMS.  
   
..DISCUSSION FROM PHXFWFPSR
 
 
WELL ABOVE NORMAL TEMPERATURES ARE EXPECTED THROUGH AT LEAST THE  
NEXT COUPLE OF DAYS AS TEMPERATURES APPROACH RECORD LEVELS.  
ADDITIONALLY, MOISTURE WILL CONTINUE TO INCREASE ACROSS THE AREA,  
LEADING TO INCREASING THUNDERSTORM CHANCES. BEST SHOWER AND STORM  
CHANCES THIS AFTERNOON AND EVENING WILL BE ACROSS THE HIGHER  
TERRAIN EAST OF PHOENIX (30-60%), HOWEVER THERE IS A 10-20% CHANCE  
THAT SOME ISOLATED SHOWERS AND STORMS COULD SURVIVE INTO THE LOWER  
DESERTS OF SOUTH-CENTRAL AZ, INCLUDING THE PHOENIX METRO. TOMORROW,  
SHOWER AND STORM CHANCES MOVE INTO SE CA AND SW AZ, WITH A 30-50%  
CHANCE ACROSS THE HIGHER TERRAIN EAST OF PHOENIX, A 20-30% CHANCE  
ACROSS THE LOWER DESERTS OF SOUTH- CENTRAL AZ, INCLUDING PHOENIX,  
AND A 20-40% CHANCE ACROSS SE CA AND SW AZ. THE PRIMARY THREATS  
WITH ANY STRONGER THUNDERSTORMS WILL BE LOCALIZED HEAVY DOWNPOURS,  
LIGHTNING, AND GUSTY, ERRATIC OUTFLOW WINDS. CHANCES FOR SEEING  
OUTFLOW WIND GUSTS IN EXCESS OF 35 MPH TODAY (TOMORROW) CLIMB  
UPWARDS OF 70% (30-50%) FOR SOUTHERN GILA, EASTERN MARICOPA, AND NW  
PINAL COUNTIES, WITH A 10% CHANCE OF SEEING GUSTS IN EXCESS OF  
58 MPH TODAY AND TOMORROW. OUTSIDE OF ANY THUNDERSTORMS, WINDS WILL  
OVERALL CONTINUE TO FAVOR DIURNAL UPSLOPE/DOWNVALLEY PATTERNS WITH  
OCCASIONAL AFTERNOON GUSTS AROUND 15-20 MPH. MIN RHS WILL REMAIN  
AROUND 15-25% OVER THE NEXT COUPLE OF DAYS, WHILE OVERNIGHT MAX RHS  
INCREASE TO UPWARDS OF 30-50% FOR MOST AREAS.  
   
..THUNDERSTORMS IMPLY GUSTY WINDS
 
 
NOTE...ADDITIONAL FIRE WEATHER FORECAST INFORMATION CAN BE FOUND IN  
THE AREA FORECAST DISCUSSION. SEE PRODUCT PHXAFDPSR.  
 

 
 
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