158  
FXUS66 KSTO 142051  
AFDSTO  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE SACRAMENTO CA  
151 PM PDT THU AUG 14 2025  
 
FOR ADDITIONAL DETAILS ON WEATHER AND EXPECTED IMPACTS OVER THE  
NEXT 7 DAYS, PLEASE VISIT WEATHER.GOV/STO/BRIEFING.  
   
DISCUSSION
 
 
   
SYNOPSIS
 
 
WARMER WEATHER ON FRIDAY, THEN NEAR TO BELOW NORMAL TEMPERATURES  
THROUGH THE WEEKEND AND INTO NEXT WEEK WITH MAINLY MINOR  
HEATRISK AND PERIODICALLY BREEZY ONSHORE FLOW. SLIGHT CHANCE OF  
THUNDERSTORMS MAINLY OVER SHASTA COUNTY VICINITY THIS WEEKEND,  
OTHERWISE DRY CONDITIONS PREVAIL.  
 

 
   
KEY MESSAGES
 
 
*TODAY-FRIDAY:  
- SLIGHT WARMING TREND TODAY AND FRIDAY WITH DRY CONDITIONS  
- AFTERNOON HIGHS THE 90S TO NEAR 100 LATE THIS WEEK FOR MUCH OF  
THE VALLEY AND FOOTHILLS  
- WIDESPREAD MINOR HEATRISK WITH LOCALIZED MODERATE HEATRISK  
 
*WEEKEND:  
- COOL DOWN WITH NEAR TO BELOW AVERAGE TEMPERATURES OVER THE  
WEEKEND AND RISING RELATIVE HUMIDITY  
- PERIODICALLY BREEZY ONSHORE FLOW IS FORECAST AT TIMES,  
STRONGEST IN THE DELTA VICINITY AND OVER THE SIERRA CREST  
- 15-30% CHANCE OF ISOLATED THUNDERSTORMS IN SHASTA COUNTY  
(INCLUDES NORTHERN SACRAMENTO VALLEY), NORTHERN COASTAL RANGE,  
AND SOUTHERN CASCADES, DRY WEATHER ELSEWHERE  
 
*EARLY TO MID NEXT WEEK:  
- BELOW NORMAL TEMPERATURES ON MONDAY WILL GRADUALLY WARM BACK UP  
TO NEAR NORMAL THROUGH NEXT WEEK AS HIGH PRESSURE IS FAVORED  
TO BUILD BACK IN OVER THE WESTERN US, CENTERED OVER THE FOUR  
CORNERS REGION  
   
CHANGES FROM PREVIOUS FORECAST
 
 
- SLIGHT INCREASE IN THUNDERSTORM POTENTIAL FOR THIS WEEKEND OVER  
SHASTA COUNTY VICINITY  
 

 
   
AVIATION
 
 
VFR CONDITIONS WILL CONTINUE FOR THE NEXT 24 HOURS ACROSS  
INTERIOR NORCAL. SUSTAINED SURFACE WINDS GENERALLY AT OR BELOW 12  
KTS EXCEPT IN THE DELTA WITH WEST-SOUTHWEST SURFACE WINDS 12-15  
KTS WITH GUSTS 20-25 KTS 00Z-12Z FRIDAY. NORTHERLY SURFACE WIND  
GUSTS OF UP TO 15-20 KTS IN THE NORTHERN SACRAMENTO VALLEY AFTER  
12Z FRIDAY.  
 

 
   
STO WATCHES/WARNINGS/ADVISORIES
 
 
NONE.  
 

 
 

 
 
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