258  
FXUS66 KSTO 201031  
AFDSTO  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE SACRAMENTO CA  
331 AM PDT THU JUL 20 2017  
   
SYNOPSIS
 
 
HOT AND DRY WEATHER CONTINUES WITH LOCALLY BREEZY CONDITIONS.  
HOTTER WEATHER FOR THE WEEKEND.  
 

 
   
DISCUSSION
 
 
AREAS OF SMOKE ORIGINATING FROM THE DETWILER FIRE CONTINUE TO  
SPREAD OVER PORTIONS OF THE MOTHERLODE AND NORTHERN SIERRA  
NEVADA, OTHERWISE SKIES REMAIN CLEAR ACROSS INTERIOR NORCAL.  
CURRENT TEMPERATURES ARE PRETTY SIMILAR ACROSS MOST OF THE REGION  
COMPARED TO 24 HOURS AGO WITH 40S AND 50S IN THE MOUNTAIN VALLEYS  
AND UPPER 50S TO AROUND 70 ELSEWHERE.  
 
LITTLE CHANGE EXPECTED TODAY AS DRY SOUTHWEST FLOW CONTINUES  
ACROSS NORCAL. HOTTER WEATHER RETURNS BEGINNING FRIDAY AND  
ACCELERATES OVER THE WEEKEND AS THE SOUTHWEST HIGH EXTENDS  
WESTWARD BRINGING SYNOPTIC WARMING AND SUPPRESSING THE MARINE  
LAYER. HIGHS SATURDAY AND SUNDAY WILL LIKELY MAKE IT INTO THE  
105-110 RANGE ACROSS THE NORTHERN SACRAMENTO VALLEY WITH OVERNIGHT  
LOWS ONLY DROPPING INTO THE LOWER 70S - SO A HEAT WATCH HAS BEEN  
POSTED FOR THAT AREA.  
 
WHILE IT WILL BE HOT, ENOUGH OF A DELTA TRICKLE IS EXPECTED INTO  
THE CENTRAL VALLEY TO KEEP TEMPERATURES IN THE SACRAMENTO AND  
STOCKTON AREAS SOMEWHAT IN CHECK OVER THE WEEKEND.  
 
ENOUGH MOISTURE MAY MOVE NORTHWARD LATE IN THE WEEKEND FOR SOME  
ISOLATED LATE-DAY THUNDERSTORMS OVER THE NORTHERN SIERRA NEVADA.  
 

 
 
.EXTENDED DISCUSSION (MONDAY THROUGH THURSDAY)  
AN UPPER LOW OFF THE NW CALIFORNIA COAST SUNDAY WEAKENS AND  
GRADUALLY DRIFTS INLAND ACROSS NORTHERN PORTIONS OF THE STATE  
EARLY NEXT WEEK. THERE WILL BE A SLOW COOLING TREND INTO MIDWEEK.  
THIS SYSTEM MAY PULL UP ENOUGH MONSOONAL MOISTURE TO BRING A  
SLIGHT CHANCE OF AFTERNOON THUNDERSTORMS OVER THE SIERRA CREST  
SOUTH OF HIGHWAY 50 MONDAY INTO WEDNESDAY. MOST OF THE MORE  
FAVORABLE CONDITIONS WILL REMAIN TO THE SOUTH AND EAST, THOUGH. EK  
 

 
   
AVIATION
 
 
SOUTHWEST FLOW ALOFT WITH VFR OVER MOST OF THE AREA. LOCAL MVFR  
IN SMOKE IS POSSIBLE NORTH AND EAST OF THE DETWILER FIRE IN  
MARIPOSA COUNTY. LOCAL GUSTS TO 25 KT THROUGH DELTA.  
 

 
   
STO WATCHES/WARNINGS/ADVISORIES
 
 
EXCESSIVE HEAT WATCH FROM LATE FRIDAY NIGHT THROUGH SUNDAY  
EVENING FOR NORTHEAST FOOTHILLS/SACRAMENTO VALLEY-NORTHERN  
SACRAMENTO VALLEY.  
 

 
 

 
 
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