231
FXUS66 KEKA 130746
AFDEKA
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE EUREKA CA
1246 AM PDT MON JUL 13 2026
KEY MESSAGES
* INTERIOR HEAT: AN UPPER-LEVEL RIDGE HAS MOVED WESTWARD CAUSING
TEMPERATURES TO RISE ABOVE NORMAL ACROSS INLAND VALLEYS AGAIN
TODAY AND TUESDAY.
* SLIGHT CHANCE THUNDERSTORMS. A 10 PERCENT CHANCE FOR
THUNDERSTORMS MONDAY AFTERNOON THROUGH EARLY TUESDAY. THEN A 20
PERCENT CHANCE IN TRINITY COUNTY ON TUESDAY AFTERNOON AND
EVENING.
* COASTAL FLOODING: MINOR COASTAL FLOODING AROUND HUMBOLDT BAY
POSSIBLE AT THE EVENING HIGH TIDE THROUGH WEDNESDAY NIGHT.
SYNOPSIS
HOT TEMPERATURES RETURN TO MUCH OF THE INTERIOR TODAY.
MONSOONAL MOISTURE WILL BRING CLOUD COVER AND MOISTURE MONDAY AND
TUESDAY. ISOLATED THUNDERSTORMS OR SHOWERS ARE POSSIBLE MONDAY AND
TUESDAY IN THE INTERIOR.
DISCUSSION
AN UPPER LEVEL TROUGH IN BRITISH COLUMBIA CONTINUES TO
INCH EASTWARD WHILE AN UPPER RIDGE OVER THE SOUTHWEST US CONTINUES
TO EXPAND WESTWARD. THIS RIDGE WILL BRING ABOVE NORMAL TEMPERATURES
TO THE INTERIOR WITH 90S LIKELY FOR MOST VALLEYS AND THE WARMEST
AREAS POSSIBLE EXCEEDING 100. MONSOONAL MOISTURE FROM THE SOUTH HAS
STARTED TO STREAM OVER THE AREA IN THE FORM OF HIGH CLOUDS. SO FAR,
NONE OF THESE HAVE RESULTED IN SHOWERS THAT REACHED THE GROUND. THIS
MAY CHANGE OVERNIGHT AS ADDITIONAL MOISTURE STREAMS IN EARLY MONDAY
MORNING. CAMS ARE SHOWING A HIGHER POTENTIAL FOR A FEW RAIN SHOWERS,
ESPECIALLY IN MENDOCINO, LAKE, AND TRINITY COUNTIES. INSTABILITY IS
LIMITED, BUT AN ISOLATED THUNDERSTORMS IS POSSIBLE WITH AN
ESPECIALLY STRONG SHOWER. DRY SURFACE CONDITIONS WILL LIKELY PREVENT
MOST PRECIPITATION FROM REACHING THE GROUND. THIS PATTERN CONTINUES
MONDAY AFTERNOON AND OVERNIGHT THROUGH TUESDAY MORNING. INSTABILITY
STILL REMAINS LIMITED, BUT A STRAY THUNDERSTORM CANNOT BE RULED OUT.
THUNDER CHANCES INCREASE TUESDAY AFTERNOON WITH ADDED SURFACE
HEATING AND MOISTURE. THE HIGHEST CHANCES ARE IN TRINITY COUNTY
WITH UP TO 20% CHANCE FOR THUNDERSTORMS. SOME OF THE CAMS WITHIN
RANGE SHOW CONVECTION MAINLY IN TRINITY COUNTY.
HIGH TEMPERATURES ARE FORECAST TO REMAIN IN THE 90S FOR MOST
INTERIOR VALLEYS WITH THE WARMEST AREAS EXCEEDING 100 EARLY NEXT
WEEK. ADDITIONAL CLOUD COVER EARLY NEXT WEEK MAY NUDGE THESE
FORECASTED TEMPERATURES DOWN A FEW DEGREES. HEATRISK REMAINS MINOR
TO LOCALLY MODERATE. COASTAL AREAS REMAIN IN THE HIGH 50S TO MID 60S
WITH STRATUS FORMING OVERNIGHT AND PARTIALLY CLEARING BY THE
AFTERNOON. DRIER AIR RETURNS MIDWEEK AS THE PACIFIC NORTHWEST TROUGH
MOVES SOUTHWESTWARD. A DEEPER MARINE LAYER WILL LIKELY BRING
INTERIOR TEMPERATURES DOWN BY A FEW DEGREES, WHILE BRINGING MORE
WIDESPREAD, AND POSSIBLY PERSISTENT, COASTAL STRATUS. HIGH PRESSURE
RETURNS LATE NEXT WEEK, RETURNING WARMER INTERIOR TEMPERATURES.
NEXT SUNDAY AND MONDAY MORE MONSOONAL MOISTURE IS EXPECTED TO
STREAM NORTH OVER THE AREA. THE NBM IS SHOWING OVER 1 INCH PWATS
AND SOME LOW END INSTABILITY. THIS WILL NEED TO BE WATCHED AS IT
GETS CLOSER AS THE NBM ALREADY HAS SOME 10 TO 20 PERCENT CHANCES
FOR THUNDER. AT THIS POINT THESE LOOK LIKE THEY MAY BE ON THE
WETTER SIDE. MKK/JB
AVIATION
LIGHT SOUTHERLY WINDS OVERNIGHT AT THE COASTAL
TERMINALS WITH HIGH PRESSURE AND NOT MUCH CLOUD COVER COULD
PRODUCE ENCOURAGE LIGHT GROUND FOG DEVELOPMENT AS RADIATIONAL
COOLING COMMENCES. MODEL GUIDANCE DOES NOT SUGGEST LOW VISIBILITY
AS MUCH AS IT DOES SUGGEST CEILINGS BELOW 500 FEET AND LIKELY TO
BE AROUND 300FEET MONDAY EARLY MORNING. WINDS VEER WESTERLY BY
THE AFTERNOON MONDAY AND IMPROVE FLIGHT CATEGORIES TO VFR AT KCEC
AND KACV. PREVAILING VFR CONDITIONS AT KUKI ARE EXPECTED WITH
NORTHERLIES GUSTING UP BY THE LATE AFTERNOON. /EYS
MARINE
NORTHERLY WINDS EASE OVERNIGHT IN THE SOUTHERN WATERS
BUT REMAIN ELEVATED SOUTH OF THE CAPE MENDOCINO WITH LOCALIZED
GUSTS UP TO 30+ KNOTS. NEARSHORE WINDS WILL BE MUCH LIGHTER AT
FOR THE NORTHERN INNER WATERS, BUT COULD STILL BE BREEZY MONDAY
AFTERNOON FOR THE SOUTHERN WATERS. GALE FORCE GUSTS ARE LIKELY TO
ARRIVE TUESDAY LATE AFTERNOON/EARLY EVENING JUST SOUTH OF THE
CAPE ONCE AGAIN. COMBINED SEAS AT 10 FEET OR LESS WILL DIMINISH
INTO MID- WEEK. WIND WAVES COULD INCREASE SEAS BY THURSDAY EVENING
AND BACK OFF BY SATURDAY MORNING. /EYS
COASTAL FLOOD
HIGH ASTRONOMICAL TIDES AND THE BASIN WIDE WARMTH
IN THE OCEAN IS CREATING HIGHER THAN NORMAL WATER LEVELS DESPITE
LIGHT NORTHERLY WINDS. THE WATER LEVELS WERE 0.6 FEET OVER THE
ASTRONOMICAL TIDE SUNDAY EVENING RESULTING IN A HIGH TIDE OF 8.8
FEET. THIS WILL LIKELY PUT WATER LEVELS AROUND 8.9 FEET AT THE
NORTH SPIT IN HUMBODLT CAUSING AND CAUSE MINOR FLOODING AGAIN
MONDAY EVENING. THIS MAY CONTINUE TUESDAY NIGHT AS WELL BEFORE
ASTRONOMICAL TIDES START TO DIMINISH WEDNESDAY NIGHT/THURSDAY
MORNING. MKK
EKA WATCHES/WARNINGS/ADVISORIES
CA...
NONE.
NORTHWEST CALIFORNIA COASTAL WATERS...
SMALL CRAFT ADVISORY UNTIL 3 AM PDT WEDNESDAY FOR PZZ455-475.
SMALL CRAFT ADVISORY UNTIL 11 PM PDT MONDAY FOR PZZ470.
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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