920
FXUS66 KEKA 150747
AFDEKA
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE EUREKA CA
1247 AM PDT SAT AUG 15 2026
KEY MESSAGES
* SMOKEY CONDITIONS CONTINUE FROM THE MP18 FIRE, FOCUSED IN THE
TRINITY RIVER VALLEY AND TRINITY COUNTY.
* NEAR TO BELOW NORMAL TEMPERATURES ARE LIKELY THROUGH NEXT WEEK.
SYNOPSIS
GENERALLY MILD WEATHER IS EXPECTED FOR THE NEXT WEEK.
A TROUGHING PATTERN HAS SET UP OVER THE REGION. INLAND AREAS CAN
EXPECT COOLER THAN NORMAL TEMPERATURES, WHILE THE COAST CONTINUES
TO HAVE OVERCAST CONDITIONS AND ONLY BRIEF AFTERNOON CLEARING.
DISCUSSION
TROUGHING CONTINUES OVER THE AREA THROUGH THE
WEEKEND AND INTO EARLY NEXT WEEK. THIS HAS SUPPORTED A MUCH DEEPER
MARINE LAYER WITH STRATUS REACHING FAR INLAND, ALONG WITH
MODERATED INTERIOR TEMPERATURES. NEAR TO BELOW NORMAL TEMPERATURES
ARE EXPECTED TO CONTINUE THROUGH MUCH OF THE WEEK AS THE
TROUGHING CONTINUES. HIGH PRESSURE MAY BRIEFLY REBUILD EARLY TO
MID WEEK, BUT MODELS ARE NOT SHOWING A SIGNIFICANT WARM UP AND
INTERIOR TEMPERATURES ARE LIKELY TO REMAIN NEAR NORMAL (WITH MOST
VALLEYS IN THE 90S). COASTAL AREAS ARE SEEING STRATUS PERSIST
THROUGH THE AFTERNOON,AND THIS IS LIKELY TO CONTINUE SO LONG AS
AFTERNOON WINDS REMAIN LIGHT. EVEN THEN, ONLY PARTIAL AFTERNOON
CLEARING IS LIKELY. ALL SAID, GENERALLY MILD, SEASONABLE WEATHER
IS EXPECTED FOR THE NEXT WEEK.
AVIATION
A SHORTWAVE TROUGH WILL IMPACT THE REGION THROUGH
SATURDAY MORNING CAUSING THE MARINE LAYER TO DEEPENED WITH LIGHT
WINDS ALONG THE COAST. MVFR TO IFR CEILINGS AT THE COASTAL
TERMINALS WILL TRANSITION TO IFR TO LIFR THROUGH EARLY THIS
MORNING. LIGHT COASTAL DRIZZLE WOULD FURTHER LOWER VIS AND BRING
CHANCES FOR FOG. CEILINGS WILL LIFT IN THE AFTERNOON, BUT THE
DEEP MARINE LAYER WILL LIMIT CLEARING ALONG THE COAST. INLAND,
EXPECT GUSTY AFTERNOON WINDS AND INCREASED LOW LEVEL CLOUD
COVERAGE, ESPECIALLY WITHIN COASTAL RIVER VALLEYS. THE RUSSIAN
RIVER VALLEY IS EXPECTED TO HAVE OVC CEILINGS AT UKI WITH LATE
MORNING CLEARING IN THE 17-18Z PERIOD.
MARINE
WINDS AND SEAS CONTINUE TO REMAIN MILD OVER THE REGION,
ESPECIALLY IN THE NEARSHORE WATERS. A LONG-PERIOD SOUTHERLY SWELL
OF ~3FT HAS BUILT INTO THE REGION AND WILL MIX WITH NORTHERLY
SHORTER PERIOD WAVES. HOWEVER, THE OVERALL SEA STATE SHOULD REMAIN
MIXED WITH THESE TWO WAVE GROUPS THROUGH THE START OF NEXT WEEK.
LIGHT TO MODERATELY BREEZY (~20KT) WINDS ARE EXPECTED THROUGH THE
EXTENDED FORECAST AS OF RIGHT NOW WITH LOCALLY STRONGER NORTHERLY
WINDS IN THE LEE OF CAPE MENDOCINO.
FIRE WEATHER
A TROUGHING PATTERN HAS SET UP OVER THE REGION. THIS
WILL RESULT IN LOWER DAYTIME TEMPERATURES, INCREASED RH VALUES, AND
BREEZIER WINDS DUE TO INCREASED MIXING. A DEEPER MARINE LAYER
WILL REACH FURTHER UP RIVER VALLEYS THROUGH THE NIGHT AS WELL,
POSSIBLY IMPACTING ANY RX BURNING OPERATIONS.
THUNDERSTORM ACTIVITY HAS LARGELY REMAINED OUTSIDE OF THE AREA AND
THIS PATTERN IS LIKELY TO CONTINUE AS BOTH MOISTURE AND
INSTABILITY REMAIN LIMITED. THUNDERSTORM CHANCES REMAIN AT 5% OR
LESS THROUGH LATE NEXT WEEK. THIS WILL BE WATCHED AS THIS
TROUGHING PATTERN CONTINUES AS ANY INCREASE IN MOISTURE AND
INSTABILITY COULD POTENTIALLY SUPPORT THUNDERSTORMS.
EKA WATCHES/WARNINGS/ADVISORIES
CA...
NONE.
NORTHWEST CALIFORNIA COASTAL WATERS...
NONE.
NOTE: THE FULL FORECAST DISCUSSION IS NOW REGULARLY ISSUED BETWEEN
10 AM/PM AND 1 PM/AM. ADDITIONAL UPDATES WILL BE ISSUED AS NEEDED.
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