430
FXUS66 KEKA 132040
AFDEKA
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE EUREKA CA
140 PM PDT MON APR 13 2026
SYNOPSIS
DRY WEATHER IS EXPECTED THROUGH TUESDAY EVENING, WITH
CHILLY OVERNIGHT TEMPERATURES EXPECTED TONIGHT FOR THE INTERIOR.
RAIN LIKELY RETURNS BY TUESDAY NIGHT INTO WEDNESDAY. NEAR FREEZING
OR FREEZING LOW TEMPERATURES ARE EXPECTED LATE IN THE WEEK. MORE
RAIN POSSIBLE OVER THE WEEKEND.
DISCUSSION
MORNING CLOUDS WERE WIDESPREAD ACROSS MOST AREAS
THIS MORNING, BUT STILL MANY OF THE COLDEST VALLEYS OBSERVED
TEMPERATURES IN THE 30S. THESE CLOUDS WILL SLOWLY SCATTER OUT AS
HIGH PRESSURE CONTINUES TO BUILD. CHILLY TEMPERATURES ARE LIKELY
AGAIN TONIGHT, WITH NEAR-FREEZING TEMPERATURES POSSIBLE IN THE
COLDEST VALLEYS. A FROST ADVISORY HAS BEEN ISSUED FOR NORTHERN
MENDOCINO AND LAKE COUNTIES. FOG IN SOME VALLEYS COULD KEEP
TEMPERATURES SLIGHTLY HIGHER THAN FORECAST, THOUGH AS WE SAW THIS
MORNING, TEMPERATURES CAN STILL GET DROP INTO THE 30S DESPITE THE
CLOUD COVER.
DRY WEATHER IS EXPECTED FOR THE START OF TUESDAY WITH WARMER
TEMPERATURES EXPECTED FOR THE INTERIOR. MANY OF THE VALLEYS COULD
SEE HIGHS IN THE 60S. TUESDAY NIGHT AND WEDNESDAY, AN UPPER LOW
MOVING INTO WASHINGTON IS EXPECTED DRAG A FRONT ACROSS NORTHERN CA
AND BRING SOME RAIN. BREEZY SOUTH WINDS OF 20 TO 30 MPH ARE
POSSIBLE. THE MOST RAIN AND STRONGEST WINDS ARE MAINLY EXPECTED TO
IMPACT DEL NORTE AND HUMBOLDT COUNTIES. RAINFALL AMOUNTS HAVE
CONTINUED TO TREND UPWARDS IN THE MODELS FOR THIS STORM. THE
CURRENT NBM IS SHOWING RAINFALL AMOUNTS AROUND AN INCH FOR
CRESCENT CITY AND DEL NORTE, BUT RAPIDLY DIMINISH AS THE FRONT
MOVES SOUTH AND WEAKENS. AROUND A HALF INCH IS EXPECTED IN EUREKA,
A QUARTER INCH IN WEAVERVILLE AND NORTHERN MENDOCINO COUNTY. LESS
THAN A TENTH OF AN INCH IS EXPECTED IN SOUTHERN MENDOCINO AND
LAKE COUNTIES. AS USUAL, THE MOUNTAINS WILL SEE MORE THAN THE
VALLEYS. SNOW LEVELS ARE EXPECTED TO BE OVER 5,000 FEET FOR MOST
OF THE PRECIP, BUT MAY DROP BELOW 4,000 FEET AS THE PRECIP COMES
TO AN END WEDNESDAY EVENING. BREEZY WEST WINDS IN EXCESS OF 30
MPH ARE POSSIBLE WEDNESDAY EVENING IN LAKE COUNTY.
WEDNESDAY NIGHT INTO THURSDAY MORNING HAS THE POTENTIAL TO BE AN
UNSEASONABLY COLD MORNING. THE NBM IS SHOWING LOWS IN THE 20S IN
NORTHERN LAKE, NORTHEAST MENDOCINO, AND MUCH OF TRINITY COUNTY.
WHILE THIS IS CERTAINLY POSSIBLE, FOG AND LOW CLOUDS MAY DEVELOP IN
SOME OF THE VALLEYS TO LIMIT THE RADIATIONAL COOLING. THURSDAY
AFTERNOON, CLEAR SKIES AND DRY CONDITIONS ARE EXPECTED WITH HIGHS
WARMING BACK INTO THE 60S. THIS WILL LIKELY SET UP THURSDAY NIGHT TO
BE THE COLDEST NIGHT WITH LOWS IN THE UPPER 20S TO UPPER 30S ACROSS
THE AREA. EVEN THE COAST MAY SEE FROST WITH SOME WEAK OFFSHORE FLOW.
FRIDAY AND SATURDAY AFTERNOON HIGHS IN THE INTERIOR ARE EXPECTED TO
WARM INTO THE 70S AND SATURDAY MORNING WILL LIKELY NOT BE AS COLD AS
FRIDAY MORNING.
SATURDAY NIGHT THROUGH MONDAY, MORE RAIN IS EXPECTED. AT THIS POINT,
THE PROBABILITY OF OVER A HALF INCH IS LESS THAN A 50 PERCENT FOR
ANY PARTICULAR 24 HOUR PERIOD. IN A 72 HOUR PERIOD, MUCH OF THE
NORTHERN HALF OF THE AREA HAS A 50-70% CHANCE FOR OVER 0.5", WHILE
THE SOUTHERN HALF HAS AROUND A 20-40% CHANCE. CHANCES FOR OVER AN
INCH IN 72 HOURS ARE AROUND 50% IN THE MOUNTAINS OF DEL NORTE AND
THE KING RANGE. DETAILS OF THIS SYSTEM WILL BECOME CLEARER IN THE
COMING DAYS.
AVIATION
NORTHWEST CALIFORNIA REMAINS WITHIN THE COLD AIR OF
A TROUGH OVER THE WESTERN UNITED STATES. PLENTY OF MOISTURE WITHIN
THIS ENVIRONMENT HAS ALLOWED WIDESPREAD CUMULUS TO FORM OVER THE
MOUNTAINOUS TERRAIN, THOUGH A CAP ALOFT IS RESTRICTING VERTICAL
DEVELOPMENT. THESE CLOUDS HAVE SPREAD TOWARD THE COAST BRINGING
CLOUD COVER TO ACV AND CEC, BUT GENERALLY REMAINING JUST ABOVE
MVFR TODAY. THE TERRAIN INDUCED CUMULUS WILL DISSIPATE THIS
EVENING ALLOWING FOR OVERNIGHT COOLING AND EVENTUALLY LOWER
CEILINGS TO DEVELOP, ESPECIALLY NORTH OF CAPE MENDOCINO ALONG THE
COAST. ADDITIONAL CLOUDS ARE LIKELY IN THE INTERIOR VALLEYS AND
UKI MAY SEE SOME OVERNIGHT IFR CONDITIONS AS WELL. /RPA
MARINE
NORTHERLIES HAVE INCREASED TODAY WITH THE PRESSURE GRADIENT
TIGHTENING BEHIND A DEPARTING FRONTAL SYSTEM AT THE SAME TIME AS
HIGH PRESSURE BUILDS OFF THE COAST. THIS HAS RESULTED IN SOME SMALL
CRAFT CONDITIONS IN THE SOUTHERN WATER ZONES TODAY THAT WILL PERSIST
INTO TONIGHT. WINDS WILL DECREASE ON TUESDAY AS THE FRONT/TROUGH
CONTINUES TO MOVE INLAND AND THE NEXT STORM SYSTEM APPROACHES THE
PACIFIC NORTHWEST. WINDS WILL BRIEFLY TURN OUT OF THE SOUTH STARTING
TUESDAY INTO TUESDAY NIGHT AHEAD OF THE NEXT FRONTAL PASSAGE. A FEW
AREAS IN THE NORTH COULD SEE NEARLY SMALL CRAFT CONDITIONS AHEAD OF
THE FRONT. HOWEVER, WINDS WILL SHARPLY TURN BACK OUT OF THE NORTH AS
THE FRONT PASSES THROUGH THE WATERS ON WEDNESDAY WITH SMALL CRAFT
AND POSSIBLY GALE CONDITIONS DEVELOPING WEDNESDAY NIGHT INTO
THURSDAY AND THURSDAY NIGHT. /RPA
EKA WATCHES/WARNINGS/ADVISORIES
CA...
FROST ADVISORY FROM 1 AM TO 8 AM PDT TUESDAY FOR CAZ110-111-
114-115.
NORTHWEST CALIFORNIA COASTAL WATERS...
SMALL CRAFT ADVISORY UNTIL 5 AM PDT TUESDAY FOR PZZ455-475.
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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