871  
FXUS66 KSTO 040346  
AFDSTO  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE SACRAMENTO CA  
846 PM PDT TUE JUN 3 2025  
   
DISCUSSION
 
 
   
SYNOPSIS
 
 
ELEVATED FIRE WEATHER CONDITIONS RETURN WEDNESDAY WITH BREEZY  
NORTHERLY WINDS AND LOW HUMIDITY. BREEZY ONSHORE WINDS WILL BRING  
SOME NIGHTTIME COOLING INTO THE DELTA AND ADJACENT AREAS. THERE  
IS A 10-20% CHANCE OF ISOLATED MOUNTAIN SHOWER/THUNDERSTORMS EACH  
AFTERNOON FROM WEDNESDAY THROUGH SUNDAY ALONG THE SIERRA CREST  
MAINLY SOUTH OF HIGHWAY 50, BUT NO SIGNIFICANT IMPACTS ARE  
EXPECTED AT THIS TIME. TEMPERATURES TREND HIGHER THIS WEEKEND.  
 

 
   
KEY MESSAGES
 
 
 
* TODAY - FRIDAY:  
-ELEVATED FIRE WEATHER CONDITIONS ON WEDNESDAY WITH BREEZY NORTHERLY  
WINDS AND LOW HUMIDITY  
-50-80% PROBABILITY OF WIND GUSTS > 30 MPH, HIGHEST IN THE  
NORTHERN AND CENTRAL SACRAMENTO VALLEY AND ADJACENT FOOTHILLS  
-LOW RELATIVE HUMIDITY WITH LIMITED OVERNIGHT RECOVERY EXPECTED  
AS BREEZY NORTH WINDS INCREASE THIS EVENING  
 
-MODERATE HEATRISK IN THE VALLEY AND LOWER FOOTHILLS EACH DAY  
-60-90% PROBABILITY OF HIGHS > 95 DEGREES IN THE  
NORTHERN/CENTRAL SACRAMENTO VALLEY  
-20-40% PROBABILITY OF HIGHS > 95 DEGREES IN THE SOUTHERN  
SACRAMENTO VALLEY, DELTA AND NORTHERN SAN JOAQUIN VALLEY  
 
-10-20% PROBABILITY OF THUNDERSTORMS WEDNESDAY, THURSDAY AND  
FRIDAY AFTERNOONS ALONG THE SIERRA CREST SOUTH OF HIGHWAY 50  
 
* SATURDAY - MONDAY:  
-WIDESPREAD MODERATE HEATRISK WITH LOCALIZED MAJOR HEATRISK  
-80-95% PROBABILITY OF HIGHS > 95 DEGREES IN THE  
NORTHERN/CENTRAL SACRAMENTO VALLEY  
-30-50% PROBABILITY OF HIGHS > 95 DEGREES IN THE SOUTHERN  
SACRAMENTO VALLEY, DELTA AND NORTHERN SAN JOAQUIN VALLEY  
 
-10-20% PROBABILITY OF THUNDERSTORMS SATURDAY AND SUNDAY  
AFTERNOONS IN THE MOUNTAINS, BEST CHANCES SOUTH OF HIGHWAY 50  
 

 
   
AVIATION
 
 
VFR CONDITIONS PREVAIL OVER INTERIOR NORCAL NEXT 24 HOURS.  
NORTHERLY SURFACE WINDS AROUND 10-15 KTS, WITH GUSTS 20-30 KTS  
OVER THE NORTHERN AND CENTRAL SACRAMENTO VALLEY WITH WEST TO  
SOUTHWEST WINDS IN THE DELTA VICINITY.  
 

 
   
STO WATCHES/WARNINGS/ADVISORIES
 
 
NONE.  
 

 
 

 
 
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