311  
FXUS66 KSTO 092114  
AFDSTO  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE SACRAMENTO CA  
214 PM PDT SAT AUG 9 2025  
 
   
DISCUSSION
 
 
   
SYNOPSIS
 
 
WIDESPREAD MODERATE HEATRISK CONTINUES INTO MONDAY WITH  
WIDESPREAD TRIPLE DIGIT HIGHS. TEMPERATURES COOL TO NEAR TO  
SLIGHTLY BELOW NORMAL BY MIDWEEK AND TREND A LITTLE LOWER BY THE  
WEEKEND. DRY WEATHER CONTINUES.  
 

 
   
KEY MESSAGES
 
 
*TODAY-SUNDAY:  
- GRADUAL WARMING AND DRYING TREND CONTINUES IN SUNDAY AS DESERT  
SOUTHWEST AND EASTERN PACIFIC RIDGING AMPLIFIES  
- BREEZY NORTH WINDS RETURN AGAIN LATE TONIGHT INTO EARLY SUNDAY  
OVER PORTIONS OF THE NORTHERN AND CENTRAL SACRAMENTO VALLEY AS  
WELL AS ADJACENT MOUNTAINS AND CANYONS  
- THE NORTHERLY WINDS AND LOW HUMIDITY WILL BRING LOCALLY  
ELEVATED FIRE WEATHER CONCERNS FOR THE NORTHERN SACRAMENTO  
VALLEY SUNDAY  
- A WEAK DELTA BREEZE WILL BRING SLIGHTLY LOWER LOWS SUNDAY  
MORNING TO INFLUENCED AREAS. AREAS NOT INFLUENCED BY THE DELTA  
BREEZE WILL HAVE ELEVATED LOW TEMPERATURES, ESPECIALLY IN THE  
FOOTHILLS AND NORTHERN SACRAMENTO VALLEY, SO CONTINUE TO  
PRACTICE HEAT SAFETY EVEN AT NIGHT TONIGHT.  
- WARMING TREND PEAKS ON SUNDAY WITH WIDESPREAD MODERATE  
HEATRISK, LOCAL MAJOR HEATRISK AND WIDESPREAD TRIPLE DIGIT HIGH  
TEMPERATURES IN THE VALLEY.  
- PROBABILITY OF HIGH TEMPERATURES > 100F:  
--NORTHERN SACRAMENTO VALLEY: 90-100%  
--REMAINDER OF THE VALLEY: 40-90%  
 
*MONDAY-TUESDAY:  
- TEMPERATURES REMAIN HOT ON MONDAY WITH WIDESPREAD MODERATE  
HEATRISK AND LOCAL MAJOR HEATRISK ACROSS THE VALLEY AND  
FOOTHILLS AND INTO THE MOUNTAINS  
- PROBABILITY OF HIGH TEMPERATURES > 100F:  
--NORTHERN SACRAMENTO VALLEY: 80-100%  
--REMAINDER OF THE VALLEY: 35-75%  
- ONSHORE FLOW NEAR THE DELTA WILL INCREASE AND GIVE SOME RELIEF  
WITH THE DELTA BREEZE FOR THE DELTA AND SOUTHERN SACRAMENTO  
VALLEY, INCLUDING THE SACRAMENTO METRO AREA.  
- THE EAST PACIFIC RIDGE AXIS ALOFT SHIFTS WESTWARD BY TUESDAY,  
WITH SHORTWAVE TROUGHING DROPPING DOWN FROM WESTERN CANADA  
- THIS WILL BRING GRADUAL COOLING ACROSS INTERIOR NORCAL WITH  
ONSHORE FLOW BRINGING A MORE SIGNIFICANT DELTA BREEZE MONDAY  
EVENING AND SEASONABLE TEMPERATURES FOR TUESDAY  
 
*WEDNESDAY TO LATE NEXT WEEK:  
- TEMPERATURES CONTINUE TO TREND LOWER MID TO LATER WEEK,  
SLIGHTLY BELOW AVERAGE WEDNESDAY AND CONTINUING TO TREND LOWER  
INTO THE WEEKEND  
- PERIODICALLY BREEZY ONSHORE FLOW CONTINUES THROUGH THE WEEK  
INTO NEXT WEEKEND  
- DRY WEATHER CONTINUES  
   
CHANGES FROM PREVIOUS FORECAST
 
 
- LITTLE CHANGE.  
 

 
   
AVIATION
 
 
VFR CONDITIONS EXPECTED TO PREVAIL NEXT 24 HOURS ACROSS INTERIOR  
NORTHERN CALIFORNIA. SUSTAINED SURFACE WINDS GENERALLY 12 KTS OR  
LESS AT TAF SITES. WEST-SOUTHWEST WIND GUSTS 15-20 KTS THROUGH THE  
DELTA 00Z-12Z SUNDAY.  
 

 
   
STO WATCHES/WARNINGS/ADVISORIES
 
 
NONE.  

 
 

 
 
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