Area Forecast Discussion
Issued by NWS Eureka, CA

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000
FXUS66 KEKA 270538
AFDEKA

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE EUREKA CA
938 PM PST FRI DEC 26 2014

.SYNOPSIS...COOLER AND MOSTLY DRY CONDITIONS WILL PERSIST THROUGH
THE WEEKEND AS HIGH PRESSURE DELIVERS BRISK AND DRY NORTHERLY FLOW
TO THE REGION. EVEN COLDER AIR IS IN STORE FOR EARLY NEXT WEEK.


&&

.UPDATE...TEMPERATURES ARE RUNNING 3 TO 5 DEGREES COLDER THAN LAST
NIGHT AT THIS TIME. FOR EXAMPLE FORTUNA AIRPORT IS ALREADY 39
DEGREES WHICH IS 5 DEGREES COLDER THAN IT WAS AT THIS TIME LAST
NIGHT WHEN THEY DROPPED TO 32 DEGREES. AT THE OFFICE ON WOODLEY
ISLAND WE ARE CURRENTLY 40 DEGREES WHICH IS 4 DEGREES COLDER THAN
WE WERE LAST NIGHT AT THIS TIME. THIS IS MAINLY DUE TO LIGHTER
WINDS. WINDS WILL CONTINUE TO DIMINISH IN MOST AREAS. AREAS AT THE
IMMEDIATE COAST WHERE WINDS REMAIN ELEVATED SUCH AS CRESCENT CITY
MAY NOT SEE FREEZING TEMPERATURES...BUT MOST AREAS ARE EXPECTED
TO. OTHERWISE THE FORECAST LOOKS ON TRACK. MKK

&&

.PREV DISCUSSION......ISSUED AT 346 PM PST...

SHORT TERM...(THROUGH TUESDAY) COLD AIR REMAINS IN PLACE OVER
NORTHWEST CALIFORNIA AS AN UPPER LEVEL RIDGE BEGINS TO BUILD OVER
THE WEST COAST. THIS RIDGE HAS ALREADY BROUGHT SOME SLIGHTLY
WARMER AIR ALOFT WHICH WILL ONLY ENHANCE THE POTENTIAL FOR POOLING
LOW LEVEL COLD AIR TONIGHT ON THE VALLEY FLOORS AS WINDS REMAIN
LIGHT AND OFFSHORE. THUS FROST AND FREEZE WARNINGS HAVE ONCE AGAIN
BEEN ISSUED FOR COASTAL AREAS AND THE INTERIOR PORTIONS OF DEL
NORTE AND HUMBOLDT COUNTIES. TEMPERATURES WILL WARM A FEW DEGREES
ON SATURDAY INTO SATURDAY NIGHT AS THE RIDGE BUILDS FARTHER INLAND
AND HIGH/MID LEVEL CLOUDS BEGIN TO SPREAD SOUTH AHEAD OF THE NEXT
COLD FRONT APPROACHING THE AREA SATURDAY NIGHT. FROST WILL BE LESS
WIDESPREAD SATURDAY NIGHT WITH MORE CLOUDS ACROSS THE AREA.

CLEARING WILL OCCUR ON SUNDAY INTO SUNDAY NIGHT AS THE FRONT SLIDES
SOUTH. HOWEVER ANOTHER FRONT WILL QUICKLY ADVANCE DOWN THE WEST
COAST ON ITS HEALS WITH A DEEP TROUGH DIVING INTO THE INTERMOUNTAIN
WEST. THIS FRONT WILL BRING SIGNIFICANTLY COLDER AIR WITH WIDESPREAD
20S AND 30S SUNDAY AND MONDAY NIGHTS. SOME SHOWERS MAY DEVELOP
ACROSS THE NORTHERN PORTIONS OF DEL NORTE AND HUMBOLDT COUNTIES AS
WELL AS OFF SHORE AS BOTH OF THESE TWO FRONTS SLIDE THROUGH THE
AREA...BUT IN GENERAL THE FRONTS WILL BE MOSTLY DRY WITH THEIR
ORIGINS OVER FAR WESTERN CANADA. RPA

LONG TERM...(TUESDAY NIGHT THROUGH FRIDAY) WARM AIR MOVES ONSHORE
ALOFT WEDNESDAY ASSOCIATED WITH THE STRENGTHENING RIDGE OVER THE
EASTERN PACIFIC. THE COLDEST TEMPERATURES THIS WEEK WILL LIKELY BE
TUESDAY AND WEDNESDAY NIGHTS AS VALLEY INVERSIONS STRENGTHEN TRAPPING
THE COLD AIR. CLEAR SKIES COMBINED WITH MOIST GROUND WILL PRODUCE
SOME PATCHY VALLEY FOG THURSDAY AND FRIDAY MORNINGS. ANOTHER FRONT
IS FORECAST TO MOVE THROUGH THE AREA LATE IN THE PERIOD OR POSSIBLY
NEXT WEEKEND BRINGING A POTENTIAL FOR PRECIPITATION OVER THE
NORTHERN REACHES OF THE FORECAST AREA. RPA/TRN

AVIATION...VFR WILL PREVAIL OVER THE NEXT 24 HOURS AT THE MAJOR
REGIONAL AIRPORTS. LOW CLOUDS AND FOG WILL AGAIN BE AN ISSUE THROUGH
THE DEEPER INTERIOR VALLEYS OVERNIGHT AND THROUGH THE MORNING HOURS.
BFG

MARINE...MODELS SHOW WEAKENING HIGH PRESSURE OVER THE NEXT 12 TO 18
HOURS AS HIGH PRESSURE OFF THE PAC NW WEAKENS AND SINKS TO THE SE.
WINDS AND SEAS WILL EASE AS A RESULT. THESE NORTHERLY WINDS THIS
EVENING WILL CAUSE A WEAK FLOW REVERSAL ALONG THE IMMEDIATE COAST
CAUSING SOUTHERLY WINDS IN THE 10 TO 15 KT RANGE. CONDITIONS WILL BE
SEASONALLY LOW ON SATURDAY INTO SUNDAY AS AN UPPER TROUGH CLIPS NW
CAL FROM THE EAST. HIGH PRESSURE WILL BUILD AGAIN LATE SUNDAY INTO
MONDAY BRINGING NORTHERLY WINDS AND STEEPENING SEAS FOR THE FIRST
PART OF THE WEEK. HAVE LEFT THE SMALL CRAFT ADVISORIES IN PLACE
THOUGH THEY WILL BE MARGINAL AT BEST. THESE SHOULD DROP OFF
OVERNIGHT AS WINDS EASE. OFFSHORE FLOW IS POSSIBLE BY EARLY TO
MIDWEEK AS A DEEPENING TROUGH DEVELOPS TO THE OUR SOUTH. BFG

&&

.EKA WATCHES/WARNINGS/ADVISORIES...
CA...
     FREEZE WARNING UNTIL 9 AM PST SATURDAY FOR CAZ001-002.

     FREEZE WARNING UNTIL 9 AM PST SATURDAY FOR CAZ003.

NORTHWEST CALIFORNIA COASTAL WATERS...
     SMALL CRAFT ADVISORY UNTIL 3 AM PST SATURDAY FOR PZZ470-475.

&&

$$

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