040
FXUS66 KEKA 221022 AAA
AFDEKA
AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE EUREKA CA
322 AM PDT WED JUL 22 2026
SYNOPSIS...MONSOONAL MOISTURE QUICKLY DEPART LATE TUESDAY,
ENDING THE RISK FOR A STRAY THUNDERSTORM. DRIER WEATHER IS
EXPECTED LATE IN THE WEEK WITH TEMPERATURES NEAR OR SLIGHTLY BELOW
SEASONAL NORMALS.
DISCUSSION...WEDNESDAY, AN AREA OF LOW PRESSURE STARTS TO MOVE
PAST THE AREA BRINGING A SLIGHTLY MORE FORCING WITH SOME
INSTABILITY IN THE AFTERNOON AND EVENING. THE ASSOCIATED MOISTURE
QUICKLY EXITED NORTH OF THE AREA LATE TUESDAY, ENDING THE RISK FOR
INTERIOR THUNDERSTORMS.
THURSDAY, THE UPPER LEVEL TROUGH IS EXPECTED TO GET CLOSER TO THE
AREA AND THIS IS EXPECTED TO START BRINGING COOLER TEMPERATURES,
BACK TO NEAR OR SLIGHTLY BELOW NORMAL WITH HIGHS IN THE UPPER 80S
TO MID 90S. THIS IS EXPECTED TO BRING SOME STRONGER WEST TO
SOUTHWEST WINDS IN THE AFTERNOON. SIMILAR TEMPERATURES AND WINDS
ARE EXPECTED TO CONTINUE ON FRIDAY. FOR DETAILS SEE THE FIRE
WEATHER SECTION. HIGH PRESSURE IS EXPECTED TO BRING WARMER
TEMPERATURES TO THE AREA FOR THE WEEKEND WITH DRY WEATHER.
AVIATION...A PASSING REMNANT TROPICAL SYSTEM HAS GREATLY WEAKENED
THE LOW LEVEL INVERSION, LIMITING STRATUS COVERAGE OVERNIGHT
TUESDAY. INCREASING SOUTHERLY WINDS LOOK TO DRIVE MARINE STRATUS
NORTHWARD TOWARD CEC WEDNESDAY, AND PERHAPS CLEARING THE LOW
CLOUDS FROM ACV THROUGH AT LEAST THROUGH WEDNESDAY NIGHT. THIS
SYSTEM WILL BRING STRONG SOUTHERLY WINDS NEAR HUMBOLDT BAY AND
PERHAPS GETTING INTO ACV WHERE GUSTS OVER 25 KTS WOULD BE POSSIBLE
IN THE AFTERNOON. CEILINGS WITH THE STRATUS ARE EXPECTED TO
TRANSITION FROM LIFR TO IFR AND PERHAPS MVFR THROUGH THE AFTERNOON
HOURS. SOUNDINGS POINT TO DEEPENING AND LIFTING OF CEILINGS
THROUGH THE AFTERNOON HOURS.
ROBUST OVERNIGHT SOUTHERLY WINDS HAVE DRIVEN STRATUS INTO UKI
WEDNESDAY MORNING. CEILINGS MAY LOWER AT OR BELOW 1700 FT AGL
THROUGH THE 15-16Z WEDNESDAY BEFORE CLEARING OUT. JJW
MARINE...A REMNANT TROPICAL SYSTEM IS PASSING THROUGH THE WATERS
WEDNESDAY. AS IT PASSES, AREAS OF NEAR GALE STRENGTH SOUTHERLY
WIND GUSTS WILL DEVELOP IN THE NORTHERN WATERS AROUND AND NORTH OF
CAPE MENDOCINO, INCLUDING IN THE NORTHERN INNER WATERS ALONG THE
COAST SOUTH OF ARCATA AND ALONG HUMBOLDT BAY. THESE WINDS WILL
QUICKLY EASE WEDNESDAY NIGHT. WINDS AND SEAS WILL THEN REMAIN LOW
FOR THE REMAINDER OF THE WEEK. JJW
FIRE WEATHER...WEDNESDAY, THE UPPER LEVEL LOW RELATED TO THE
DEPARTING TROPICAL SYSTEM MOVES CLOSER TO THE AREA, THE ASSOCIATED
MOISTURE QUICKLY EXITED NORTH OF THE AREA LATE TUESDAY, ENDING
THE RISK FOR INTERIOR THUNDERSTORMS.
THURSDAY AND FRIDAY THE THREAT FOR THUNDERSTORMS DIMINISHES;
HOWEVER, SOME STRONGER WEST TO SOUTHWEST WINDS ARE EXPECTED. AT
THIS POINT IT LOOKS LIKE THE RH WILL BE TOO HIGH TO WARRANT A FIRE
WEATHER WATCH. WILL LIKELY ADD A HEADLINE TO THE FORECAST ONCE IT
GETS WITHIN RANGE OF THE HIGHER RESOLUTION MODELS IF THE WINDS
REMAIN IN THE FORECAST. MKK/JJW
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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