520  
FXUS66 KSTO 190745  
AFDSTO  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE SACRAMENTO CA  
1245 AM PDT FRI AUG 19 2022  
   
SYNOPSIS
 
 
HOT WEATHER CONTINUES TODAY AND SATURDAY WITH WIDESPREAD TRIPLE  
DIGIT HEAT IN THE VALLEY AND FOOTHILLS RESULTING IN MODERATE TO  
HIGH HEAT RISK. NOT AS HOT NEXT WEEK.  
 

 
   
DISCUSSION
 
 
THE LOW THAT BROUGHT THE CLOUDS AND ISOLATED SHOWERS/THUNDERSTORMS  
THE PAST FEW DAYS IS SLOWLY DRIFTING TO THE EAST INTO THE GREAT  
BASIN. OTHER THAN SOME REMNANT CLOUDS FROM THURSDAY'S CONVECTION  
OVER EASTERN SHASTA COUNTY, SKIES ARE CLEAR ACROSS INTERIOR NORCAL  
EARLY THIS MORNING. IR DIFFERENCE IMAGERY SHOWS MORE EXTENSIVE  
STRATUS ALONG THE COAST, BUT PROFILER DATA INDICATE THE MARINE  
LAYER DEPTH IS BELOW 1K FT. THE DELTA BREEZE IS A BIT STRONGER AND  
IT'S BROUGHT LOCAL COOLING INLAND TO THE SACRAMENTO REGION WHERE  
CURRENT TEMPERATURES ARE RUNNING ABOUT 3-6 DEGREES COOLER COMPARED  
TO 24 HOURS AGO. ELSEWHERE, CURRENT READINGS ARE RUNNING A LITTLE  
MILDER COMPARED TO EARLY THURSDAY.  
 
HOTTER WEATHER IS EXPECTED TODAY AND SATURDAY AS RIDGING RETURNS,  
DELTA INFLUENCE WANES AND ABUNDANT SUNSHINE RETURNS AS DEEPER  
MONSOON MOISTURE/INSTABILITY SHIFT EAST OF THE REGION. WIDESPREAD  
MODERATE, WITH AREAS OF HIGH, HEAT RISK WILL PERSIST THROUGH THE  
FIRST HALF OF THE WEEKEND. THE NORTHERN SACRAMENTO VALLEY WILL SEE  
HIGHS APPROACHING 110 DEGREES TODAY, AND WILL HAVE A NON-ZERO  
CHANCE OF EXCEEDING 110 ON SATURDAY. THE NORTH VALLEY AND FOOTHILL  
THERMAL BELTS WILL CONTINUE TO SEE OVERNIGHT LOWS IN THE 70S WITH  
WARMEST SPOTS NEAR 80. THE HEAT ADVISORY REMAINS IN EFFECT UNTIL 7  
PM SATURDAY.  
 
IT'S STILL LOOKING LIKE ABOUT 5-10 DEGREES OF COOLING CAN BE  
EXPECTED ACROSS THE REGION BEGINNING SUNDAY AND CONTINUING INTO  
EARLY NEXT WEEK AS HIGH PRESSURE WEAKENS WITH THE INCOMING  
TROUGH. HIGHS WILL RETURN TO ONLY A LITTLE ABOVE AVERAGE WHILE  
OVERNIGHT LOWS WILL BE NOTICEABLY COOLER WITH ONSHORE FLOW.  
 

 
   
EXTENDED DISCUSSION (TUESDAY THROUGH FRIDAY)
 
 
CLUSTERS CONTINUE TO PROMOTE AN UPPER LEVEL TROUGH OVER THE PACNW  
TUESDAY THROUGH EARLY THURSDAY, BECOMING MORE POSITIVELY TILTED  
OVER TIME. JUST SOUTH OF INTERIOR NORCAL, HIGH PRESSURE PERSISTS  
TRYING TO BUILD INTO THE CWA WITH THE ONLY THING HOLDING IT BACK  
THE AFOREMENTIONED TROUGHING. TEMPERATURES WILL BE A BIT WARMER  
THAN NORMAL VALUES NEXT WEEK, BUT ONLY BY 5 DEGREES OR SO.  
MONSOONAL MOISTURE KEEPS TO THE EAST FOR THE MOST PART THROUGH THE  
EXTENDED PERIOD, BUT WILL NEED TO KEEP AN EYE ON LATE WEEK AS  
SOME GUIDANCE SUGGESTS POSSIBLE MOUNTAIN STORMS OVER THE SIERRA  
FRIDAY.  
 

 
   
AVIATION
 
 
VFR CONDITIONS OVER INTERIOR NORCAL FOR THE NEXT 24 HOURS.  
SURFACE WINDS GENERALLY AT OR BELOW 12 KTS EXCEPT IN THE DELTA  
AREA, WHERE GUSTS UP TO 25 KTS ARE POSSIBLE AFTER 03Z SATURDAY.  
 

 
   
STO WATCHES/WARNINGS/ADVISORIES
 
 
HEAT ADVISORY UNTIL 7 PM PDT SATURDAY FOR CARQUINEZ STRAIT AND  
DELTA-CENTRAL SACRAMENTO VALLEY-MOTHERLODE-MOUNTAINS  
SOUTHWESTERN SHASTA COUNTY TO WESTERN COLUSA COUNTY-NORTHEAST  
FOOTHILLS/SACRAMENTO VALLEY-NORTHERN SACRAMENTO VALLEY-NORTHERN  
SAN JOAQUIN VALLEY-SOUTHERN SACRAMENTO VALLEY.  
 

 
 

 
 
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