637  
FXUS66 KMTR 191017  
AFDMTR  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA  
317 AM PDT FRI AUG 19 2022  
   
SYNOPSIS
 
WARM TO HOT TEMPERATURES WILL PERSIST ACROSS THE  
INTERIOR THROUGH SATURDAY WHILE COOLER CONDITIONS PREVAIL NEAR  
THE COAST. TEMPERATURES COOL REGION-WIDE TO NEAR SEASONAL AVERAGES  
ON SUNDAY AND MONDAY.  
 

 
   
DISCUSSION...AS OF 03:16 AM PDT FRIDAY
 
A TYPICAL "SUMMER-  
LIKE" WEATHER PATTERN PERSISTS OVER THE REGION EARLY THIS MORNING  
WITH THE MARINE LAYER COMPRESSING TO AROUND 500 FEET IN DEPTH.  
THIS HAS RESULTED IN TEMPERATURES AT OR SLIGHTLY COOLER COMPARED  
TO 24 HOURS AGO IN THE COASTAL AND ADJACENT LOW LYING AREAS WITH  
MORE NOTABLE COOLING ACROSS THE INTERIOR AND IN THE REGION'S  
HIGHER ELEVATIONS. GIVEN THE COMPRESSED MARINE LAYER, PATCHY FOG  
IS MORE PREVALENT NEAR THE COAST AND IN THE VALLEYS OF SONOMA  
COUNTY.  
 
GIVEN THE MARINE LAYER'S SHALLOW NATURE, LOOK FOR LOW CLOUDS TO  
DISSIPATE AND RETREAT TO THE COAST BY MID-TO-LATE MORNING. WITH  
HIGH PRESSURE BUILDING IN FROM THE EASTERN PACIFIC, ANOTHER WARM  
DAY IS ANTICIPATED ACROSS THE INTERIOR WHERE WIDESPREAD 80S TO 90S  
WILL BE COMMON. ONSHORE FLOW AND THE MARINE AIR MASS WILL KEEP  
CONDITIONS MUCH COOLER ONCE AGAIN THIS AFTERNOON NEAR THE COAST  
AND BAYS. A CONTINUED WELL DEFINED MARINE LAYER WILL ALSO BRING  
LOW CLOUDS AND FOG BACK INLAND TONIGHT INTO SATURDAY MORNING.  
SIMILAR CONDITIONS ARE LIKELY REGION-WIDE ON SATURDAY WITH SLIGHT  
WARMER TEMPERATURES ACROSS THE INTERIOR VALLEYS INCLUDING  
LOCATIONS AROUND THE SOUTH BAY AS THE HIGH PRESSURE ALOFT BUILDS  
INLAND.  
 
A COOLING TREND WILL TAKE PLACE ON SUNDAY AND MONDAY AS A  
MID/UPPER LEVEL TROUGH TO THE NORTH PUSHES INLAND ACROSS THE  
PACIFIC NORTHWEST. THIS WILL BRING TEMPERATURES BACK TO NEAR  
SEASONAL AVERAGES ACROSS THE INTERIOR WITH LITTLE CHANGE NEAR THE  
COAST. HIGH PRESSURE WILL ONCE AGAIN BECOME THE DOMINATE FEATURE  
HEADING INTO NEXT WEEK WITH TEMPERATURES HOLDING STEADY OR  
SLIGHTLY WARMING ACROSS THE INTERIOR.  
 

 
   
AVIATION...AS OF 11:14 PM PDT THURSDAY
 
FOR THE 06Z TAFS. A MIX  
OF CONDITIONS FROM VFR INLAND TO LIFR AT THE COAST WITH MARINE  
STRATUS PENETRATING INLAND. SATELLITE IMAGERY SHOWS STRATUS  
REACHING EAST BAY, CONTINUING TO EXPAND OVER THE BAY AND INTO THE  
NORTH BAY VALLEYS. COASTAL MONTEREY BAY AND THE NORTHERN SALINAS  
VALLEY ARE ALREADY MOSTLY COVERED. THE MARINE LAYER HAS COMPRESSED  
AT BODEGA BAY TO JUST A FEW HUNDRED FEET, BUT HAS EXPANDED AT  
FORT ORD TO 1800 FT DEEP. OVERNIGHT, WILL SEE MOSTLY IFR CIGS  
AROUND SF BAY, AND IFR/LIFR AROUND MONTEREY BAY AND ALONG THE  
COAST. INTERIOR EAST BAY TERMINALS WILL LIKELY AVOID THE STRATUS.  
CLEARING IS EXPECTED ON FRIDAY BY AROUND 17Z FOR SF BAY TERMINALS  
BUT 18Z-19Z ALONG THE COAST.  
 
LIGHT WINDS OVERNIGHT, BECOMING BREEZY ONSHORE FRIDAY AFTERNOON.  
ANOTHER STRATUS INTRUSION FRIDAY EVENING/NIGHT WITH SIMILAR AREAL  
COVERAGE AND CIG HEIGHTS.  
 
VICINITY OF KSFO...WINDS HAVE SUBSIDED AT THE TERMINAL AND ARE  
NOW BELOW 10 KT. WINDS CONTINUE TO DIMINISH OVERNIGHT. BKN IFR CIG  
AT THE TERMINAL, AS STRATUS CONTINUES TO MOVE THROUGH THE SAN  
BRUNO GAP AND GOLDEN GATE, EXPANDING AROUND THE BAY. CIGS LIKELY  
CONTINUE THROUGH MID-MORNING AT IFR LEVELS, POSSIBLY RISING TO  
MVFR. VFR IS FORECAST ON FRIDAY WITH A RETURN OF ONSHORE WINDS  
WITH STRONGER WIND GUSTS AFTER 22Z.  
 
KSFO BRIDGE APPROACH...APPROACH IS CLEAR BUT PATCHY STRATUS OVER  
SOUTH BAY WILL EVENTUALLY EXPAND TO COVER THE APPROACH TOWARDS  
10Z-12Z. CLEARING AROUND 17Z.  
 
MONTEREY BAY...MAINLY LIFR AT AREA TERMINALS, THOUGH KMRY/KSNS  
ARE EXPERIENCING TEMPO CLEARING, AS STRATUS CIRCULATES AROUND THE  
BAY. TERMINALS WILL ALL BE COVERED UNDER LIFR OR POSSIBLE IFR CIGS  
OVERNIGHT. REDUCED VIS DUE TO MIST AND PATCHY FOG ALSO LIKELY.  
CLEARING IS PROJECTED AROUND 17Z-19Z WITH LATER CLEARING AT THE  
COAST. VFR SKIES WITH BREEZY ONSHORE WINDS IN THE AFTERNOON.  
ANOTHER STRATUS PUSH IN THE EVENING.  
 

 
   
MARINE...AS OF 03:16 AM PDT FRIDAY
 
STRONG NORTHWEST WINDS AND  
BUILDING SEAS TODAY, PARTICULARLY OVER THE NORTHERN OUTER WATERS  
WHERE GALE FORCE GUSTS WILL BE POSSIBLE. STEEP WIND WAVES AND  
HAZARDOUS SEAS FOR SMALLER VESSELS PERSIST THROUGH SATURDAY,  
BEFORE SUBSIDING. A MODERATE PERIOD SOUTHERLY SWELL PREVAILS  
THROUGH THE WATERS THROUGH THE FORECAST PERIOD.  
 

 
   
MTR WATCHES/WARNINGS/ADVISORIES
 
 
.TDAY...SCA...PIGEON PT TO PT PINOS 0-10 NM FROM 9 AM  
SCA...PT ARENA TO PT REYES 0-10 NM  
SCA...PT ARENA TO PIGEON PT 10-60 NM  
SCA...PT PINOS TO PT PIEDRAS BLANCAS 0-10 NM  
SCA...PIGEON PT TO PT PIEDRAS BLANCAS 10-60 NM  
SCA...PT REYES TO PIGEON PT 0-10 NM FROM 9 AM  
SCA...MRY BAY FROM 3 PM  
 

 
 

 
 
PUBLIC FORECAST: RGASS  
AVIATION: LORBER  
MARINE: LORBER  
 
VISIT US AT WWW.WEATHER.GOV/SANFRANCISCO  
 
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