489  
FXUS66 KHNX 050037  
AFDHNX  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE HANFORD CA  
537 PM PDT SAT OCT 4 2025  
   
UPDATE  
 
AVIATION AND AIR QUALITY UPDATED  
 
 
 
 
   
KEY MESSAGES  
 
1. AFTER COOLER THAN AVERAGE TEMPERATURES TODAY, SEASONABLY  
WARM TEMPERATURES WITH DRY CONDITIONS RETURN SUNDAY THROUGH  
MUCH OF NEXT WEEK.  
 
2. ANOTHER LOW PRESSURE SYSTEM WILL BRING THE NEXT CHANCE FOR  
PRECIPITATION FRIDAY INTO NEXT SATURDAY.  
 
 
   
DISCUSSION  
 
COOLER THAN AVERAGE TEMPERATURES WILL PREVAIL ONCE AGAIN TODAY  
AS A NORTHWEST FLOW PREVAILS BEHIND THE TROUGH THAT PASSED OVER  
CENTRAL CALIFORNIA YESTERDAY. HOWEVER, IT WILL BE A BIT WARMER  
TODAY. DRY CONDITIONS ARE EXPECTED UNTIL LATE NEXT WEEK AS A  
RIDGE OF HIGH PRESSURE SETS UP, THOUGH NOT SIGNIFICANTLY STRONG.  
A NOTICEABLE WARMING TREND IS IN STORE SUNDAY THROUGH THE  
MIDDLE OF THE WEEK. THERE IS ABOUT A 45 TO 70 PERCENT CHANCE OF  
HIGHS REACHING 85 DEGREES BY TUESDAY AND WEDNESDAY IN THE SAN  
JOAQUIN VALLEY WITH SLIGHTLY HIGHER CHANCES FOR THE KERN COUNTY  
DESERT.  
 
THE NEXT COOLING TREND BEGINS FRIDAY INTO NEXT WEEKEND,  
THOUGH A MODEST CHANGE IS PROJECTED AT THIS TIME WITH HIGHS  
STILL NEAR 80 DEGREES IN THE WARMEST LOCATIONS. A 15 TO 30  
PERCENT CHANCE FOR PRECIPITATION EXISTS FOR BOTH FRIDAY AND NEXT  
SATURDAY FOR MUCH OF THE REGION, WITH THE HIGHEST CHANCES OVER  
THE SIERRA NEVADA. SNOW LEVELS WILL GENERALLY BE 9,000 TO 10,000  
FEET AS MODELS SHOW AN INFLUX OF TROPICAL MOISTURE MOVING INTO  
OUR AREA, AS WELL AS THE DESERT SOUTHWEST AND SOUTHERN CA.  
EXACT DETAILS SUCH AS AMOUNT AND TRACK REMAIN UNCERTAIN AT THIS  
TIME.  
 
THE LATEST OUTLOOKS FROM THE CLIMATE PREDICTION CENTER SHOW  
BELOW AVERAGE TEMPERATURES FOR THE 6-10 DAY AND 8-14 DAY PERIODS  
WITH ABOVE AVERAGE PRECIPITATION FAVORED.  
 
 
 
   
AVIATION  
 
VFR CONDITIONS ARE EXPECTED THROUGH 0Z MONDAY.  
 
 
   
AIR QUALITY ISSUES  
 
NONE.  
 
 
   
CERTAINTY  
 
THE LEVEL OF CERTAINTY FOR DAYS 1 AND 2 IS HIGH.  
THE LEVEL OF CERTAINTY FOR DAYS 3 THROUGH 7 IS MEDIUM.  
 
CERTAINTY LEVELS INCLUDE LOW...MEDIUM...AND HIGH. PLEASE VISIT  
WWW.WEATHER.GOV/HNX/CERTAINTY.HTML FOR ADDITIONAL INFORMATION  
AND/OR TO PROVIDE FEEDBACK.  
 
 
   
HNX WATCHES/WARNINGS/ADVISORIES  
 
NONE.  
 
 
 
 
PUBLIC...BSO  
AVIATION....JPK  
 
WEATHER.GOV/HANFORD  
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