780
FXUS66 KEKA 082044
AFDEKA
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE EUREKA CA
144 PM PDT TUE JUL 8 2025
SYNOPSIS
NEAR OR SLIGHTLY BELOW NORMAL TEMPERATURES ARE
EXPECTED AGAIN WEDNESDAY. THERE IS A SLIGHT CHANCE FOR THUNDER
STORMS TONIGHT NORTH OF HIGHWAY 36. WARMING IS EXPECTED AGAIN
THURSDAY WITH ADDITIONAL WARMING FRIDAY AND HOT WEATHER
CONTINUING INTO EARLY NEXT WEEK.
DISCUSSION
THE UPPER LEVEL CONTINUES TO APPROACH THE AREA THIS
AFTERNOON AND HAS BROUGHT MUCH COOLER TEMPERATURES TO THE NEAR
COASTAL AREAS. TEMPERATURES IN UKIAH ARE ONLY AROUND 74 AS OF
NOON SO THE MARINE LAYER IS OBVIOUSLY KEEP THINGS COOLER. LATE
THIS EVENING AND TONIGHT THE CENTER OF THE UPPER LOW MOVES OVER
THE AREA. THIS HAS THE POTENTIAL TO BRING SOME THUNDERSTORMS TO
THE AREA. THE MODELS AREN'T EXPLICITLY OUTPUTTING THUNDERSTORMS,
BUT THERE IS SOME ELEVATED INSTABILITY. THIS, COMBINED WITH THE
DYNAMICS OF THE LOW AND STEEP LAPSE RATES ALOFT MAY BRING SOME
NOCTURNAL THUNDERSTORMS.
WEDNESDAY DURING THE DAY THE LOW IS EXPECTED TO MOVE OFF TO THE
EAST AND WE WILL BE IN NORTHWEST FLOW. IT LOOKS LIKE THE THREAT
FOR THUNDERSTORMS WILL DIMINISH THROUGH THE DAY LIGHT HOURS ON
WEDNESDAY. TEMPERATURES WILL BE SIMILAR TO TODAY WITH A FEW
FLUCTUATIONS HERE AND THERE.
WEDNESDAY NIGHT INTO THURSDAY MORNING OFFSHORE FLOW IS EXPECTED
IN HUMBOLDT AND DEL NORTE COUNTIES. THIS SHOULD DIMINISH THE
MARINE LAYER AND ALLOW SKIES TO CLEAR. THURSDAY IS EXPECTED TO BE
THE TRANSITION DAY WITH WARMER TEMPERATURES, BUT HIGHS ARE
EXPECTED TO REMAIN IN THE 90S IN MOST INLAND AREAS WITH LOW TO MID
60S POSSIBLE ALONG THE COAST. FRIDAY ADDITIONAL WARMING IS
EXPECTED WITH HIGHS CLIMBING OVER 100 IN MANY OF THE VALLEYS. THE
COAST MAY SEE HIGHS IN THE MIDDLE TO UPPER 60S WITH CONTINUED
OFFSHORE FLOW. THIS IS EXPECTED TO BRING MODERATE TO MAJOR HEAT
RISK TO MANY OF THE AREAS. THIS HEAT IS EXPECTED TO PERSIST
THROUGH THE WEEKEND IN SOME OF THE INTERIOR AREAS. A HEAT ADVISORY
MAY BE NEEDED IN SOME OF THE MORE PERSISTENTLY HOT AREAS. THERE IS
SOME UNCERTAINTY ON HOW MUCH THE VALLEYS WILL COOL OFF AT NIGHT
AND THAT COULD MITIGATE THE IMPACT OF THE HEAT. MKK
AVIATION
AN UPPER LEVEL LOW IS CURRENTLY SPINNING OVER THE
COASTLINE. LOWS LIKE THIS TYPICALLY RESULT IN A DEEPENING OF THE
MARINE LAYER, HIGHER CEILINGS, AND SPOTTY DRIZZLE. THUS, DESPITE
LOWER CEILINGS BEING SHOWN IN THE TAF STATISTICAL GUIDANCE, HAVE
OPTED TO NOT INCLUDE BELOW HALF MILE VISIBILITIES FOR COASTAL
AREAS TONIGHT. SOME BREAKUP OF THE CLOUDS WILL BE POSSIBLE AT THE
COASTAL TAF SITES BUT GENERALLY OVERCAST WILL PREVAIL TODAY INTO
TONIGHT. INLAND VFR HAS DEVELOPED AND WILL PERSIST TODAY BUT
ANOTHER DEEP PUSH OF THE MARINE LAYER IS EXPECTED TONIGHT WITH
MVFR/IFR CEILINGS AT UKI WEDNESDAY MORNING. /RPA
MARINE
LIGHT WINDS AND LOW SEAS ARE CURRENTLY DOMINATING THE MARINE
ENVIRONMENT AS AN UPPER LOW SPINS OVER THE COASTAL WATERS. THIS LOW
WILL MOVE INLAND TOMORROW ALLOWING SURFACE HIGH PRESSURE TO RE-BUILD
TOWARD THE NORTHWEST CALIFORNIA COAST OVER THE EASTERN PACIFIC. THIS
WILL ENHANCE THE PRESSURE GRADIENT AND ONCE AGAIN STRENGTHEN THE
NORTHERLIES. NEAR GALE TO GALE WIND GUSTS ARE POSSIBLE THURSDAY
THROUGH SATURDAY, MOST LIKELY OVER THE OUTER WATER ZONES, PULLING
INTO JUST THE NORTHERN WATERS THIS WEEKEND AS THE THERMAL TROUGH
BUILDS NORTH OVER LAND. STEEP SHORT PERIOD SEAS WILL BUILD IN
RESPONSE TO THE GALE NORTHERLIES. /RPA
FIRE WEATHER
HIGH TEMPERATURES DIMINISHED TODAY AND ARE
EXPECTED TO PERSIST ON WEDNESDAY, WITH 80'S AND 90'S EXPECTED FOR
MOST OF THE INTERIOR. THE MARINE LAYER IS EXPECTED TO REMAIN
DEEPER THROUGH WEDNESDAY MORNING AS AN UPPER-LOW MOVES PAST THE
AREA, BRINGING SLIGHTLY HIGHER AFTERNOON RHS. AS THIS UPPER LOW
MOVES OVERHEAD THERE IS THE POTENTIAL FOR THUNDERSTORMS TO MOVE
ACROSS HUMBOLDT, DEL NORTE AND TRINITY COUNTIES TONIGHT.
CONFIDENCE REMAINS LOW ON THIS AND THE BETTER CHANCE FOR
THUNDERSTORMS REMAINS TO THE NORTH OF THE AREA. OVERNIGHT
RECOVERIES GENERALLY REMAIN GOOD ASIDE FROM THE EXPOSED RIDGES IN
THE THERMAL BELT.
MUCH HOTTER TEMPERATURES AND DRIER HUMIDITY ARE LIKELY IN THE
INTERIOR LATE THIS WEEK. THURSDAY AND FRIDAY MORNINGS OFFSHORE
FLOW WILL BRING POOR RECOVERIES TO THE HIGHER ELEVATIONS AND MAY
PUSH THE STRATUS OFF THE COAST. TRIPLE DIGIT TEMPERATURES ARE
LIKELY IN MOST OF THE INTERIOR VALLEYS BY FRIDAY WITH VERY LOW
AFTERNOON RHS AND MODERATE OVERNIGHT RECOVERIES. JB
EKA WATCHES/WARNINGS/ADVISORIES
CA...
NONE.
NORTHWEST CALIFORNIA COASTAL WATERS...
NONE.
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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