231
FXUS66 KEKA 110849
AFDEKA
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE EUREKA CA
149 AM PDT SAT JUL 11 2026
KEY MESSAGES
* TROUGHING PATTERN: DEEPER COASTAL STRATUS PUSHING FURTHER
INLAND, ALONG WITH MORE CLOUD COVER AND COOLER AFTERNOON HIGH
TEMPERATURES SATURDAY.
* SLIGHT THREAT FOR ISOLATED SHOWERS/THUNDERSTORMS. A 10 TO 15%
CHANCE FOR THUNDERSTORMS, MOSTLY IN TRINITY ALPS AND YOLLA
BOLLYS.
* INTERIOR HEAT: AN UPPER-LEVEL RIDGE WILL EXPAND WESTWARD LATE
THIS WEEKEND AND INTO EARLY NEXT WEEK, CAUSING TEMPERATURES TO
RISE ABOVE NORMAL ACROSS INLAND VALLEYS INCLUDING LAKE, TRINITY,
AND INTERIOR MENDOCINO COUNTIES.
SYNOPSIS
SLIGHTLY COOLER TEMPERATURES, ALONG WITH DEEPER
COASTAL STRATUS AND OVERALL CLOUDINESS IS EXPECTED FOR NORTHWEST
CALIFORNIA SATURDAY. SUNDAY AND INTO EARLY NEXT WEEK, AN UPPER
RIDGE WILL BUILD IN CAUSING HOTTER AND DRIER CONDITIONS FOR THE
INTERIOR. THERE IS ALSO THE THREAT FOR ISOLATED THUNDERSTORMS OR
SHOWERS EARLY NEXT WEEK IN THE INTERIOR.
DISCUSSION
AN UPPER LEVEL TROUGH IS SLIDING EASTWARD AFFECTING
NORTHWEST CALIFORNIA EARLY THIS WEEKEND WHILE AN UPPER LEVEL
RIDGE OVER THE SOUTHWEST US CONTINUES EXPANDING WESTWARD LATE THIS
WEEKEND AND EARLY NEXT WEEK. TONIGHT THROUGH EARLY SUNDAY, A
TROUGHING PATTERN WILL CAUSE DEEPER COASTAL STRATUS OVERNIGHT
WHICH WILL PUSH FURTHER INLAND UP RIVER VALLEYS. WITH THE SLIGHT
INFLUX OF MOISTURE AND COOLER AIR FROM THE TROUGH, HIGH
TEMPERATURES WILL BE SLIGHTLY COOLER, ESPECIALLY FOR INTERIOR
AREAS, FOR THE NEXT COUPLE OF DAYS. SOME CLOUDS ASSOCIATED WITH
THE TROUGH WILL PUSH THROUGH THE REGION SATURDAY.
SUNDAY AND INTO EARLY/MID NEXT WEEK, THE UPPER LEVEL RIDGE CENTERED
OVER THE SOUTHWESTERN US WILL AID IN ADVECTING MONSOONAL MOISTURE
UP TO NORTHWESTERN CALIFORNIA BY SUNDAY/MONDAY. THIS COULD RESULT
IN ISOLATED THUNDERSTORMS OVER THE YOLLA BOLLYS AND TRINITY ALPS.
CHANCES HAVE STARTED TO INCREASE AND ARE NOW 15 PERCENT IN
NORTHERN TRINTY COUNTY ON TUESDAY. OTHER AREAS ARE STILL LESS
THAN 10%, BUT THIS PATTERN IS STILL WORTH MONITORING DUE TO
POTENTIAL FIRE WEATHER CONCERNS. EARLY TO MID NEXT WEEK, THE
INTERIOR WILL WARM UP AND DRY OUT WITH THE POTENTIAL FOR MODERATE
HEATRISK FOR COMMUNITIES IN LAKE AND NORTHEASTERN TRINITY
COUNTIES.
AVIATION
WITH THE UPPER MID LEVEL LOW ENCROACHING ON OUR AREA,
ALTHOUGH BE IT SLIGHT, THERE IS AN INTRODUCTION OF MOISTURE AND
INSTABILITY THAT COULD EFFECT FLIGHT CATEGORIES AND WEATHER IN
GENERAL AS MONSOONAL MID LEVEL MOISTURE ARRIVES OVER THE NEXT FEW
DAYS. WITH MIXING THERE WILL BE A DEEPER MARINE LAYER AND
SUBSEQUENTLY HIGHER CEILINGS OVERNIGHT INTO SATURDAY MORNING OF
1200FT OR SO WITH MODELS HINTING AT A FEW HOURS OF LIFR AT KACV
AND KCEC. VARIABLE WINDS OUT OF THE EAST AT TIMES BUT MOSTLY LIGHT
AT KUKI WITH PREVAILING VFR CONDITIONS INTO THE MORNING HOURS.
NORTHERLY WINDS WILL BUILD AT KUKI BY 18-19Z, SUSTAINED UNDER
10KTS OR SO. /EYS
MARINE
THE SURFACE PRESSURE GRADIENT CONTINUES TO WEAKEN
CAUSING WINDS AND SEAS TO DIMINISH OVERNIGHT BUT EXPECT
NORTHERLIES TO BUILD BY SATURDAY AFTERNOON. LOCALIZED AREAS SOUTH
OF CAPE MENDOCINO WILL REACH GALE CRITERIA, SATURDAY AFTERNOON AND
INTO SUNDAY EARLY MORNING. CALMER MARINE CONDITIONS ARE
ANTICIPATED BEFORE NORTHERLY WINDS INCREASE AGAIN LATE
WEEKEND/EARLY NEXT WEEK CAUSING MORE CONCERNS FOR SMALL CRAFT
ADVISORY CRITERIA.
EKA WATCHES/WARNINGS/ADVISORIES
CA...
NONE.
NORTHWEST CALIFORNIA COASTAL WATERS...
SMALL CRAFT ADVISORY UNTIL 3 AM PDT SUNDAY 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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