887
FXUS66 KEKA 122047
AFDEKA
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE EUREKA CA
147 PM PDT THU JUN 12 2025
SYNOPSIS
LOW HEAT RISK IS FORECAST IN THE INTERIOR WITH NEAR
TO SLIGHTLY BELOW AVERAGE TEMPERATURES THROUGH SUNDAY. SLIGHT
WARMING IS FORECAST EARLY TO MID NEXT WEEK. STRONGER COASTAL
NORTHERLIES SHOULD CLEAR OUT THE STRATUS DURING THE AFTERNOONS.
KEY MESSAGES:
* LOW HEAT RISK IN THE INTERIOR WITH DAYTIME HIGH TEMPERATURES IN
THE 80'S THROUGH SUNDAY.
* SLIGHT WARMING AND LOW HEAT RISK FORECAST TO CONTINUE EARLY
TO MID NEXT WEEK.
* GUSTY WESTERLY AND NORTHWESTERLY BREEZES WITH LOW DAYTIME
HUMIDITY IN THE INTERIOR VALLEYS EACH AFTERNOON THROUGH
SATURDAY.
* STRONGER AND GUSTIER COASTAL NORTHERLIES EXPECTED FRIDAY AND
PERHAPS SATURDAY.
DISCUSSION
BROAD UPPER LEVEL TROUGH WILL REMAIN OFFSHORE OVER THE NORTHEAST
PACIFIC THROUGH THE WEEKEND. HIGH TEMPERATURES IN THE INTERIOR
WILL CONTINUE TO TREND DOWN ON FRIDAY AND THEN EDGE UP SOME OVER
THE WEEKEND. MOST INTERIOR SITES WILL REMAIN IN THE 80'S THROUGH
THE WEEKEND. HEAT RISK WILL REMAIN LOW THIS WEEKEND, BUT HOT
WEATHER MAY STILL IMPACT INDIVIDUALS WHO ARE EXTREMELY SENSITIVE.
STRONGER AFTERNOON AND EVENING WEST-TO-NORTHWEST BREEZES ARE
EXPECTED FOR MANY OF THE INTERIOR VALLEYS THROUGH FRIDAY. GUSTS
GENERALLY FROM 15-20 MPH ARE LIKELY (60% CHANCE OR HIGHER), THOUGH
WIND CHANNELED VALLEYS AND RIDGES WILL HAVE STRONGER GUSTS FROM
25-35 MPH. COASTAL NORTHERLIES WILL ALSO INCREASE ON FRIDAY AND
GUSTS FROM 35-40 MPH ARE POSSIBLE (60% CHANCE) OVER THE
HEADLANDS; PT ST GEORGE AND CAPE MENDO.
W-SW FLOW ALOFT WITH EMBEDDED SHORTER WAVELENGTH TROUGHS WILL
OCCASIONALLY TRAVERSE INTO THE PAC NW FRIDAY-SUNDAY. FIRST ONE IS
EXPECTED ON FRIDAY, FOLLOWED BY ANOTHER ONE ON SUNDAY. SW FLOW IS
DRY AND PRECIP CHANCES REMAIN QUITE LOW, BELOW 10% OR ZERO. LARGER
SCALE TROUGH PASSAGE IS FORECAST TO OCCUR MONDAY. ONCE AGAIN PRECIP
CHANCES REMAIN MEAGER. BUILDING 500MB HEIGHTS AND BROAD FLAT
RIDGING WILL LIKELY RESULT IN SLIGHT INTERIOR WARNING TUE INTO
WED NEXT WEEK. HIGHER PWATS SPILL OVER THE OFFSHORE RIDGE IN WESTERLY
FLOW MON-TUE NEXT WEEK. CHANCES FOR A FEW HUNDREDTHS OF AN INCH
OF PRECIP INCREASES A BIT. WITH VERY LITTLE OR NO IMPACTS FROM THIS
MINUSCULE AMOUNT OF RAIN OR DRIZZLE, WILL NOT ADJUST ANY OF THE
NBM PRECIP PROBABILITIES. NO CLEAR SIGNS FOR A MAJOR WARM UP EITHER
THROUGH MUCH OF NEXT WEEK. IF ANYTHING TEMPERATURES WILL PROBABLY
TREND DOWNWARD LATE NEXT WEEK AS YET ANOTHER TROUGH DIGS SOUTHWARD
FROM THE GULF OF AK.
AVIATION
18Z TAF: DEEP MARINE LAYER REMAINS PRESENT OVER THE
NORTHERN HUMBOLDT AND DEL NORTE COASTS THIS AFTERNOON. MVFR
CONDITIONS PREVAIL AT CEC WITH LIGHT NW FLOW WHILE ACV HAS STRUGGLED
TO CLIMB OUT OF IFR CEILINGS. GUSTS 10 TO 15 KNOTS POSSIBLE THIS
AFTERNOON WITH POTENTIAL FOR BRIEF SCATTERING - CHANCES ARE BETTER
AT CEC WHERE NORTHERLY WINDS OFFSHORE MAY ONCE AGAIN SCOUR OUT A
PORTION OF THE STRATUS SHIELD, SIMILAR TO YESTERDAY. SIMILAR IFR
CEILINGS EXPECTED TO REDEVELOP NORTH OF THE CAPE LATE THIS EVENING
AND OVERNIGHT WITH MIST POSSIBLE CLOSER TO SUNRISE, ESPECIALLY
AROUND HUMBOLDT BAY AND THE EEL RIVER VALLEY. HREF INDICATES 40 TO
60% CHANCE FOR <1000 FOOT CEILINGS TO DEVELOP AT CEC AS WINDS
CONTINUE TO STRENGTHEN OFFSHORE. THERE IS <50% CHANCE FOR STRATUS
DEVELOPMENT SPILLING OVER INTO THE RUSSIAN RIVER VALLEY AT UKI.
OTHERWISE, NORTHERLY WINDS WILL CONTINUE TO INCREASE FRIDAY,
ALLOWING A BETTER CHANCE FOR SCATTERED TO NEARLY CLEAR SKIES FOR THE
COASTAL TERMINALS.
MARINE
WINDS WILL CONTINUE TO GRADUALLY INCREASE ACROSS THE WATERS
THROUGH FRIDAY. WIDESPREAD FRESH TO STRONG NORTHERLY BREEZES HAVE
BEEN OBSERVED OVER THE LAST 24 HOURS AS THE COASTAL PRESSURE
GRADIENT TIGHTENS. SMALL AREAS OF NEAR-GALE TO GALE FORCE GUSTS ARE
POSSIBLE DOWNWIND OF CAPE MENDOCINO AND POINT SAINT GEORGE BEGINNING
THIS AFTERNOON, BECOMING MORE LIKELY FRIDAY AND SATURDAY AFTERNOON.
WINDS WILL LIKELY PUSH CLOSER TO SHORE EACH AFTERNOON AND EVENING,
DRIVING SOME STEEP SHORT PERIOD WAVES INTO THE INNER WATERS. WINDS
AND SEAS REMAIN BE ELEVATED THROUGH THE WEEKEND, ESPECIALLY IN THE
OUTER WATERS WITH WAVE HEIGHTS 8 TO 10 FEET AT 8 TO 9 SECONDS
EXPECTED. STRONG NORTHERLY WINDS FORECAST TO DECREASE SLIGHTLY AND
RETREAT TO THE SOUTHERN WATERS EARLY NEXT WEEK.
FIRE WEATHER
GUSTY WEST TO NORTHWEST BREEZES ARE FORECAST TO CONTINUE THROUGH
FRIDAY IN THE INTERIOR VALLEYS. GUST MAGNITUDE WILL VARY WIDELY,
GENERALLY PEAKING AROUND 15-20 MPH IN THE AFTERNOONS AND EVENINGS.
THERE HAVE BEEN WINDIER SITES GUSTING TO 25-35 MPH, PARTICULARLY
IN LAKE, EASTERN MENDOCINO AND EASTERN TRINITY. THESE GUSTY W-NW
DIURNAL WINDS ALONG WITH MINIMUM RH'S FROM 10-20% MAY YIELD AN
INCREASED RISK FOR SMALL AND FAST SPREADING GRASS FIRES,
PARTICULARLY IN LAKE COUNTY. SOME HIGHER ELEVATION WINDIER SITES
EXTENDING INTO AND ABOVE THE INVERSION HAVE BEEN REPORTING POOR RH
RECOVERIES; 15-25%. OTHERWISE, MOST LOWER ELEVATIONS WILL CONTINUE
TO HAVE GOOD OVERNIGHT RECOVERIES ONCE WINDS BECOME LIGHT OR CALM.
EKA WATCHES/WARNINGS/ADVISORIES
CA...
NONE.
NORTHWEST CALIFORNIA COASTAL WATERS...
SMALL CRAFT ADVISORY UNTIL 3 AM PDT SATURDAY FOR PZZ455-470-
475.
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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