525 

FNUS86 KSGX 201010

FWLSGX



ECCDA DISCUSSIONS

NATIONAL WEATHER SERVICE SAN DIEGO CA

310 AM PDT WED MAY 20 2026



ECC033-210415-

ORANGE ECC DISPATCH-

DISCUSSION FOR ORANGE ECC DISPATCH

310 AM PDT WED MAY 20 2026



LOWEST DAYTIME HUMIDITY FOR THE DESERTS WILL REMAIN AROUND 10 

PERCENT THROUGH THURSDAY WITH THE MOUNTAINS AND INLAND VALLEYS 

FALLING TO 8 TO 15 PERCENT TODAY WITH WEAK OFFSHORE FLOW INLAND. 

GRADUAL WARMING WILL CONTINUE FOR THE MOUNTAINS AND DESERTS 

THROUGH THURSDAY WHILE THE COAST AND VALLEYS BEGIN TO COOL. FOR 

FRIDAY THROUGH TUESDAY, NOT MUCH CHANGE IN HIGH TEMPERATURES IS 

EXPECTED FOR THE MOUNTAINS AND DESERTS WHILE THE COAST AND VALLEYS

COOL A FEW DEGREES. LOWEST DAYTIME HUMIDITY FOR THE DESERTS WILL 

RECOVER TO 10 TO 15 PERCENT FOR FRIDAY THROUGH TUESDAY.



$$



ECC035-210415-

MONTE VISTA ECC DISPATCH-

310 AM PDT WED MAY 20 2026



LOWEST DAYTIME HUMIDITY FOR THE DESERTS WILL REMAIN AROUND 10 

PERCENT THROUGH THURSDAY WITH THE MOUNTAINS AND INLAND VALLEYS 

FALLING TO 8 TO 15 PERCENT TODAY WITH WEAK OFFSHORE FLOW INLAND. 

GRADUAL WARMING WILL CONTINUE FOR THE MOUNTAINS AND DESERTS 

THROUGH THURSDAY WHILE THE COAST AND VALLEYS BEGIN TO COOL. FOR 

FRIDAY THROUGH TUESDAY, NOT MUCH CHANGE IN HIGH TEMPERATURES IS 

EXPECTED FOR THE MOUNTAINS AND DESERTS WHILE THE COAST AND VALLEYS

COOL A FEW DEGREES. LOWEST DAYTIME HUMIDITY FOR THE DESERTS WILL 

RECOVER TO 10 TO 15 PERCENT FOR FRIDAY THROUGH TUESDAY.



$$



ECC034-210415-

RIVERSIDE ECC DISPATCH-

310 AM PDT WED MAY 20 2026



...DISCUSSION FROM LAXFWFSGX...



LOWEST DAYTIME HUMIDITY FOR THE DESERTS WILL REMAIN AROUND 10 

PERCENT THROUGH THURSDAY WITH THE MOUNTAINS AND INLAND VALLEYS 

FALLING TO 8 TO 15 PERCENT TODAY WITH WEAK OFFSHORE FLOW INLAND. 

GRADUAL WARMING WILL CONTINUE FOR THE MOUNTAINS AND DESERTS 

THROUGH THURSDAY WHILE THE COAST AND VALLEYS BEGIN TO COOL. FOR 

FRIDAY THROUGH TUESDAY, NOT MUCH CHANGE IN HIGH TEMPERATURES IS 

EXPECTED FOR THE MOUNTAINS AND DESERTS WHILE THE COAST AND VALLEYS

COOL A FEW DEGREES. LOWEST DAYTIME HUMIDITY FOR THE DESERTS WILL 

RECOVER TO 10 TO 15 PERCENT FOR FRIDAY THROUGH TUESDAY.



...DISCUSSION FROM PHXFWFPSR...



UNDER CONTINUED DRY AND WELL MIXED CONDITIONS, TEMPERATURES WILL 

HOVER AROUND THE SEASONAL NORMAL THROUGH THURSDAY. MINIMUM 

AFTERNOON HUMIDITY LEVELS IN A 5-15% RANGE WILL BE COMMON  FOLLOWING

POOR TO FAIR OVERNIGHT RECOVERY OF 15-35%. WINDS WILL  MAINTAIN A

NOCTURNAL DRAINAGE/DIURNAL UPSLOPE COMPONENT WITH  FREQUENT

AFTERNOON GUSTS 15-25 MPH. 



...THUNDERSTORMS IMPLY GUSTY WINDS...



NOTE...ADDITIONAL FIRE WEATHER FORECAST INFORMATION CAN BE FOUND IN

THE AREA FORECAST DISCUSSION. SEE PRODUCT PHXAFDPSR.





$$