150
FXUS66 KEKA 302249
AFDEKA
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE EUREKA CA
349 PM PDT SUN MAR 30 2025
SYNOPSIS
SCATTERED TO WIDPREAD SHOWERS THIS EVENING THROUGH
TUESDAY AFTERNOON. HEAVY MOUNTAIN SNOW FOR ELEVATIONS ABOVE 3000
FEET. ISOLATED THUNDERSTORMS, SMALL HAIL AND MODERATE-TO-HEAVY
DOWNPOURS POSSIBLE MONDAY THROUGH TUESDAY. LINGERING SHOWERS
THROUGH WEDNESDAY, FOLLOWED BY DRY WEATHER FOR THE REMAINDER OF
THE WEEK.
DISCUSSION
A SURFACE LOW BROUGHT STRONG SOUTH-SOUTHEAST ALONG
THE COAST AND AND EXPOSED RIDGES TODAY. SURFACE OBSERVATIONS
REPORTED 45 TO 60 MPH IN DEL NORTE AND HUMBOLDT COUNTIES AS THE
LOW MOVES NORTHEASTWARD NEAR THE NORTH COAST. A WARM AIR
ADVECTION ALONG THE LOW- LEVEL JET PROMOTE HIGH TEMPERATURES IN
THE UPPER 50'S TO MID 60'S. SHOWERS ACTIVITY WILL GRADUALLY
INCREASE AS DOWNSLOPING WIND WEAKENS THIS AFTERNOON.
A COLD FRONT WILL PUSH ONSHORE LATE THIS AFTERNOON WHILE THE MAIN
UPPER LEVEL TROUGH LOCATED OVER THE NEPAC SLOWLY DIGGING
SOUTHWARD ALONG THE COAST. EXPECT PERIODS OF MODERATE TO LOCALLY
HEAVY SHOWERS AND ISOLATED THUNDERSTORMS POSSIBLE THIS EVENING.
THE AFOREMENTIONED TROUGH WILL BRING PERIODS OF WIDESPREAD
SHOWERS ACROSS THE AREA THROUGH TUESDAY. RAIN WILL BE FOCUSED IN
THE NORTHERN HALF OF THE AREA MONDAY AND TUESDAY. OVER 48 HOURS, 2
TO 4 INCHES IS MOST LIKELY IN HUMBOLDT COUNTY AND NORTHERN
MENDOCINO, WITH UP TO 5.5 INCHES IN DEL NORTE AND GENERALLY LESS
THAN 1.5 INCHES FURTHER SOUTH. LESSER AMOUNTS UP TO 0.75 INCH ARE
EXPECTED FOR SOUTHERN LAKE COUNTY.
A COLDER DEEP-LAYER AIRMASS WILL SUBSEQUENTLY SPREAD SOUTH ACROSS
THE WEST COAST TONIGHT AND PERSISTING THROUGH TUESDAY. THE COLD
AIRMASS WILL AID IN STEEP LAPSE RATES AND INCREASING INSTABILITY
ENVIRONMENT. ISOLATED THUNDERSTORMS, SMALL HAIL AND BRIEF HEAVY
DOWNPOURS WILL BE POSSIBLE WITH THE STRONGEST SHOWERS. IN
ADDITION, GUSTY SOUTHWEST WINDS FROM 25 TO 40 MPH ARE EXPECTED
ACROSS THE AREA LATE MONDAY AFTERNOON THROUGH TUESDAY AFTERNOON.
MOUNTAIN SNOW IMPACT WILL LIKELY OVER TRINITY COUNTY AND NORTHERN
INTERIOR HUMBOLDT MONDAY THROUGH TUESDAY AFTERNOON. SNOW LEVELS
WILL LIKELY DROP TO 3000 FEET ON MONDAY. HEAVY SNOW, WITH STORM
TOTAL ACCUMULATIONS AT 7 TO 12 INCHES FOR ELEVATIONS ABOVE 3000
FEET, WITH LOCALLY UP TO 1.5 FEET ACROSS THE HIGHER RIDGES, WILL
BE PROBABLE FROM MONDAY MORNING THROUGH TUESDAY AFTERNOON. SNOW
LEVELS WILL BE GENERALLY ABOVE 3000 FEET. HOWEVER, UNCERTAINTY
EXIST WITH SNOW LEVELS DUE TO IT COULD BE LOWER DURING CONVECTIVE
SHOWERS. 2 TO 3 INCHES OF SNOW ARE EXPECTED FOR ELEVATIONS AS LOW
AS 2600 FEET. TRAVEL IMPACTS ARE EXPECTED ACROSS MUCH OF HIGHWAY
3 NORTH OF WEAVERVILLE AND HAYFORK SUMMIT, HWY JUNCTION 36 AND 3
AT SOUTH FORK MOUNTAIN, HWY 299 AT BERRY SUMMIT, BUCKHORN SUMMIT
AND OREGON MOUNTAIN.
LINGERING SHOWERS ARE EXPECTED THROUGH WEDNESDAY, FOLLOWED BY DRY
WEATHER FOR THE REMAINDER OF THE WEEK AS A LARGE SCALE UPPER LEVEL
RIDGE GRADUALY BUILDS ACROSS THE REGION IN THE WAKE OF THE TROUGH.
AVIATION
ACTIVE DAY OF WINDS TODAY WITH A POTENT SHORTWAVE TROUGH
WAVE PASSING BY. AMPLE MOUNTAIN WAVE ACTIVITY CONTINUES TO BE
OBSERVED THROUGH MUCH OF SOUTHERN HUMBOLDT AND MENDOCINO COUNTIES,
AND LOW LEVEL TURBULENCE WILL REMAIN A THREAT.
.SURFACE WINDS WILL EASE SOME GOING IN TO THIS EVENING, BUT FARTHER
NORTH IN TO CEC, WIND GUSTS OF 30 KTS FROM THE SOUTH CAN BE EXPECTED
TO CONTINUE THROUGH MONDAY. LOW LEVEL WIND SHEAR HAS BEEN REPORTED
AT ACV. WINDS ALOFT TO 2000 FT AGL WILL STILL OCCASIONALLY SEE 30 TO
35 KTS WINDS GOING INTO MONDAY MORNING, AND SOME THREAT FOR LOW
LEVEL WINDS SHEAR WILL REMAIN.
THE SHOWER ACTIVITY WILL ALSO CONTINUE, EVOLVING INTO A GREATER
THUNDERSTORM THREAT THIS LATE AFTERNOON AND EVENING. MVFR TO VFR
CONDITIONS WILL CARRY ON OUTSIDE OF THE HEAVIER SHOWER AND
ANTICIPATED THUNDERSTORM ACTIVITY WHERE IFR CIGS AND VIS WILL EXIST.
THE PROBABILITY FOR THUNDERSTORMS INCREASES FOR THE COASTAL
TERMINALS AFTER 0Z TO 20-30%. THE CHANCES FURTHER INCREASE INTO
MONDAY MORNING TO 30% (UP TO 40% LOCALLY FOR COASTAL DEL NORTE PER
HREF). THESE STORMS ARE EXPECTED TO CONTAIN SMALL HAIL. /JJW
MARINE
A POTENT SHORTWAVE TROUGH PASSED THROUGH THE WATERS TODAY,
AND GUSTS OF 45 TO UP TO 50 KTS WERE RECORDED ON SOME OF THE COASTAL
BUOYS. SOME LINGERING HAZARDOUS SEAS WILL BE LIKELY THIS EVENING IN
THE WAKE OF THE STRONG GALE. A SEPARATE AND LARGER TROUGH OF LOW
PRESSURE WILL THEN BEGIN WORKING ITS WAY SE TOWARDS THE NORTH COAST.
THIS WILL KEEP WITH SOUTHERLY WINDS UP THROUGH TUESDAY MORNING WHEN
THE LOW PUSHES ASHORE, LIKELY INTO SOUTHERN OR.
NEAR GALE TO GALE STRENGTH GUSTS WILL PERSIST AS A RESULT, AND A
SEPARATE GALE WARNING MAY BE REQUIRED FOR MONDAY NIGHT INTO TUESDAY,
PARTICULARLY IN THE NORTHERN OUT ZONE. THIS TROUGH WILL GENERATE
BROAD AND STRONG FETCH OF WESTERLY WINDS AS IT NEARS. LARGE, VERY
STEEP AND LIKELY HAZARDOUS SEAS UP TO 18 FT ARE FORECAST TO BE SENT
OUR WAY FORM THIS FETCH MONDAY EVENING THROUGH TUESDAY. A HAZARDOUS
SEAS WATCH MAY BE FORTHCOMING AS THE GALES EXPIRE. /JJW
EKA WATCHES/WARNINGS/ADVISORIES
CA...
WIND ADVISORY UNTIL 4 PM PDT THIS AFTERNOON FOR CAZ101-102.
WINTER WEATHER ADVISORY FROM 5 PM MONDAY TO 5 PM PDT
TUESDAY FOR CAZ105.
WINTER STORM WARNING FROM 11 PM THIS EVENING TO 5 PM PDT
TUESDAY FOR CAZ107-108.
NORTHWEST CALIFORNIA COASTAL WATERS...
GALE WARNING UNTIL 7 PM PDT THIS EVENING FOR PZZ450-470.
SMALL CRAFT ADVISORY UNTIL 11 PM PDT MONDAY FOR PZZ455-475.
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