936
FXUS66 KMTR 021825
AFDMTR
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN FRANCISCO CA
1125 AM PDT SUN AUG 2 2026
..NEW AVIATION
KEY MESSAGES
UPDATED AT 1220 PM PDT SAT AUG 1 2026
- MODERATE HEATRISK IN THE INTERIOR THROUGH MONDAY WITH SOME
PATCHES LINGERING THROUGH THE NEXT WEEK
- NEAR CRITICAL FIRE WEATHER THREAT ACROSS THE INTERIOR NORTH AND
EAST BAYS, AND THE DIABLO AND SANTA LUCIA RANGES THROUGH MONDAY
- HAZARDOUS BEACH CONDITIONS ACROSS THE PACIFIC COAST WITH AN
INCREASED RISK FOR SNEAKER WAVES AND RIP CURRENTS THROUGH THE
AFTERNOON
- STRONG AND GUSTY WINDS DEVELOP OVER COASTAL WATERS NORTH OF PT
REYES THROUGH SUNDAY
UPDATE
ISSUED AT 909 AM PDT SUN AUG 2 2026
ANOTHER DAY, ANOTHER OTTER EDDY OVER MONTEREY BAY AS THE STRATUS
CONTINUES TO LINGER ACROSS THE COASTAL PLAINS AND INTO THE
NORTHERN SALINAS VALLEY. PATCHES OF STRATUS ALSO LINGER ALONG THE
SAN MATEO PENINSULA COASTLINE. OTHERWISE, THE REST OF THE REGION
IS CLEAR AND THE FORECAST IS ON TRACK.
DIALH
SHORT TERM
ISSUED AT 208 AM PDT SUN AUG 2 2026
(TODAY AND TONIGHT)
AN UPPER LEVEL DISTURBANCE WILL PASS OVER THE PACNW TODAY, WITH
QUASI-ZONAL FLOW TO WEAK TROUGHING SETTING UP OVER NORTHERN CA. TO
OUR SOUTHWEST WEST, HIGH PRESSURE IS BEING SUPPRESSED OVER THE DESERT
SOUTHWEST AND SOUTHERN CA. WHAT DOES THAT MEAN FOR US IN THE SHORT
TERM? WELL, IT MEANS THE MARINE LAYER WILL REMAIN COMPRESSED AS A
RESULT, AT ABOUT 500FT AND HUGGING THE SAN MATEO AND CENTRAL COAST
LINE WHICH MEANS CLOUDY SKIES, PATCHY DENSE FOG, AND PERHAPS COASTAL
DRIZZLE THROUGH THE MID MORNING. SKIES WILL THEN CLEAR, LEADING TO A
MAINLY SUNNY DAY ACROSS THE REGION. MODERATE HEATRISK IS EXPECTED
TODAY FOR INTERIOR LOCATIONS WHERE TEMPERATURES REACH THE MID 90S TO
LOW 100S. ELSEWHERE, TEMPERATURES RISE INTO THE LOW 70S TO MID 80S
UNLESS YOU'RE IMMEDIATELY ALONG THE COAST WHERE TEMPERATURES 60S.
LONG TERM
ISSUED AT 208 AM PDT SUN AUG 2 2026
(MONDAY THROUGH SATURDAY)
LITTLE CHANGE FOR MONDAY AS THE AFOREMENTIONED UPPER LEVEL TROUGH
PUSHES EAST, ALLOWING THE PATTERN TO CHANGE FROM QUASI-ZONAL AND
TROUGHY TO QUASI-ZONAL WITH HIGH PRESSURE BUILDING IN. THE FORECAST
WILL ESSENTIALLY BE ON REPEAT, WITH PERHAPS INTERIOR TEMPERATURES
WARMING UP A FEW DEGREES. HEADING INTO MIDWEEK, THERE ARE A FEW
ITEMS THAT COULD AFFECT TEMPERATURES. THE FIRST BEING ONSHORE FLOW
USHERING IN SOME COOLER AIR; HOWEVER, IT WILL BE DEPENDENT ON HOW
QUICKLY THE HIGH BUILDS IN. IF IT IS ABLE TO BUILD, 850MB TEMPS LOOK
TO BE FAIRLY WARM IN THE DETERMINISTIC GUIDANCE. THIS MEANS TEMPS
MAY NEED TO BE BUMPED UP A FEW DEGREES INLAND INSTEAD OF SHOWING A
SUBTLE COOLING TREND. BEYOND THAT HIGH PRESSURE LOOKS TO BUILD AND
HOLD LEADING TO A WARMING TREND FOR LATE WEEK AND INTO THE
WEEKEND.
AVIATION
(18Z TAFS)
ISSUED AT 1123 AM PDT SUN AUG 2 2026
WIDESPREAD VFR CONDITIONS AS THE LAST BIT OF STRATUS SCATTERS OUT.
GENTLE TO MODERATE ONSHORE WINDS AROUND 10-15 KT PREVAIL THROUGH THE
AFTERNOON AND EASE OVERNIGHT. THERE IS SOME DEGREE OF UNCERTAINTY
REGARDING WIND DIRECTION AFTER SUNSET FOR TERMINALS SOUTH OF THE
GOLDEN GATE. AS THE WEAK UPPER LEVEL TROUGH TRAVELS EASTWARD, IT
SQUASHES THE HIGH PRESSURE CENTERED OVER THE SOUTHWEST RESULTING IN
A WEAK SOUTHWESTERLY FLOW OVER OUR REGION. WINDS MAY BECOME VARIABLE
OVERNIGHT, BUT SHOULD REMAIN LIGHT AROUND 4-8 KT. THE COMPRESSED
MARINE LAYER RETURNS AROUND 08-10Z MONDAY WITH HIGH CONFIDENCE IN
IFR CEILINGS AT HAF, MRY, AND SNS. EVERYWHERE ELSE SHOULD REMAIN VFR
THROUGH THE TAF PERIOD WITH SOME SCT CLOUD DECKS.
VICINITY OF SFO...VFR THROUGH THE TAF PERIOD WITH MEDIUM TO HIGH
CONFIDENCE. WESTERLY WINDS INCREASE TO 12-18 KT THROUGH THE
AFTERNOON AND DECREASE TO AROUND 8-10 KT BY SUNSET. AS STATED ABOVE,
WINDS MAY BECOME VARIABLE AND GENTLE OVERNIGHT. THE MARINE LAYER
SHOULD REMAIN CONFINED TO THE COASTLINE OVERNIGHT WITH LOW
CONFIDENCE ON IFR CEILINGS AT OAK AND SFO.
SFO BRIDGE APPROACH...SIMILAR TO SFO.
MONTEREY BAY TERMINALS...NORTHWEST WINDS INCREASE AROUND 20-21Z
AND EASE BY SUNSET WHILE BECOMING VARIABLE OVERNIGHT. ANTICIPATE A
DELAYED ARRIVAL OF IFR CEILINGS AROUND 08-10Z MONDAY THAT WILL
PERSIST THROUGH 17-18Z. THE COMPRESSED MARINE LAYER ALSO BRINGS
THE POTENTIAL FOR COASTAL FOG AND DRIZZLE WHICH WILL IMPACT
VISIBILITY.
MARINE
(TODAY THROUGH FRIDAY)
ISSUED AT 909 AM PDT SUN AUG 2 2026
NORTHWEST WINDS REMAIN STRONG TO NEAR GALE TODAY AND DIMINISH TO
MODERATE BY MONDAY NIGHT. NORTHERN WATERS CONTINUE TO HAVE
FREQUENT GALE FORCE GUSTS INTO EARLY MONDAY MORNING. WIND DRIVEN
ROUGH TO VERY ROUGH SEAS (9-15 FEET) HANG ON THROUGH TUESDAY
MORNING WHILE GRADUALLY SUBSIDING TO MODERATE (4-8 FEET) THROUGH
FRIDAY.
FIRE WEATHER
ISSUED AT 452 AM PDT SAT AUG 1 2026
NEAR CRITICAL FIRE WEATHER CONDITIONS ARE EXPECTED THROUGH THE
WEEKEND AND POTENTIALLY INTO NEXT WEEK. TEMPERATURES REMAIN AROUND
10 TO 15 DEGREES ABOVE NORMAL ACROSS THE INTERIOR THROUGH EARLY
NEXT WEEK WITH HIGHS IN THE UPPER 80S TO 90S. NO MAJOR CHANGES TO
THE FORECASTED DRY CONDITIONS. DAYTIME HUMIDITY RETENTION REMAINS
POOR ACROSS THE INTERIOR (25-30%) WITH HUMIDITY VALUES DROPPING
INTO THE 10S ACROSS THE INTERIOR CENTRAL COAST, EAST BAY
HILLS/VALLEYS, AND THE HIGHER ELEVATIONS. PORTIONS OF THE INTERIOR
CENTRAL COAST MAY SEE DAYTIME HUMIDITY VALUES DROP INTO THE SINGLE
DIGITS THIS WEEKEND INTO EARLY NEXT WEEK. OVERNIGHT RH RECOVERY
REMAINS POOR AT LOCATIONS ABOVE 2,000 FEET WITH VALUES BETWEEN 25
TO 40% EXPECTED WITH SOME FAVORED LOCATIONS STRUGGLING TO REACH
EVEN 25%. THIS WILL BE PARTICULARLY TRUE ACROSS THE MAYACAMAS,
HIGHEST PEAKS OF THE EAST BAY HILLS, THE DIABLO RANGE, THE SANTA
CRUZ MOUNTAINS, THE SANTA LUCIA AND GABILAN RANGES. NOCTURNAL
DRYING (RAPID DECREASE IN RH THROUGH THE PRE- DAWN HOURS) MAY ALSO
TRANSPIRE WHICH WILL INCREASE THE BURN PERIOD OR TIME IN WHICH
FIRE BEHAVIOR MAY REMAIN ACTIVE. ENERGY RELEASE COMPONENTS (ERC)
ARE PROJECTED TO CLIMB ABOVE THE 97TH PERCENTILE ACROSS THE
INTERIOR CENTRAL COAST AND MID COAST TO MENDOCINO (NORTH BAY)
ZONE. ERC VALUES ARE RAPIDLY CLIMBING ACROSS THE DIABLO-SANTA
CRUZ ZONE (DIABLO MOUNTAINS AND SANTA CRUZ MOUNTAINS) WITH VALUES
APPROACHING THE 97TH PERCENTILE BY NEXT WEEK. DIURNALLY BREEZY
ONSHORE WINDS ARE EXPECTED ALONG THE COAST, MOUNTAIN GAPS AND
PASSES, AND ALONG THE RIDGELINES EACH AFTERNOON/EVENING. WITH
NEAR CRITICALLY DRY CONDITIONS AND ABOVE NORMAL TEMPERATURES
EXPECTED, INDIVIDUALS ACROSS THESE AREAS ARE ADVISED TO AVOID
ACTIVITIES THAT MAY SPARK A FIRE. FIRE CREWS ARE URGED TO EXERCISE
EXTRA CAUTION WHEN EXECUTING ANY PRESCRIBED BURNS, ESPECIALLY
WHERE FUELS, TOPOGRAPHY, AND WEATHER ALIGN.
MTR WATCHES/WARNINGS/ADVISORIES
CA...NONE.
PZ...GALE WARNING UNTIL 9 PM PDT THIS EVENING FOR PT ARENA TO PT
REYES 0-10 NM.
GALE WARNING UNTIL 3 AM PDT MONDAY FOR PT ARENA TO PT REYES 10-
60 NM.
SMALL CRAFT ADVISORY UNTIL 3 PM PDT MONDAY FOR PIGEON PT TO PT
PINOS 10-60 NM.
SHORT TERM...KR
LONG TERM....KR
AVIATION...NAVARRETE
MARINE...NAVARRETE
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