AFDEKA

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE EUREKA CA
732 PM PDT SUN JUL 1 2018

.SYNOPSIS...HOT TEMPERATURES OVER THE INTERIOR WILL CONTINUE
THROUGH MONDAY WITH MORE SEASONABLE TEMPERATURES ALONG THE COAST.
TEMPERATURES WILL RETURN TO NEAR NORMAL BY THE MIDDLE OF THE WEEK,
BUT INCREASE AGAIN LATE IN THE UPCOMING WEEK. NO RAINFALL IS
EXPECTED.

&&

.UPDATE...CLOUDS AND FOG HAVE STARTED TO MAKE THEIR WAY UP THE
MENDOCINO COAST ALONG WITH SOUTHERLY WINDS SO HAVE UPDATED THE
FORECAST TO ADD SOME CLOUD COVER TO THOSE AREAS THROUGH MONDAY
MORNING. WINDS HAVE BECOME SOUTHERLY AT UKIAH AND THE BODEGA BAY
PROFILER IS SHOWING THE MARINE LAYER AROUND 2,000 FEET DEEP. ALSO
TEMPERATURES IN UKIAH THIS AFTERNOON HAVE DROPPED MUCH FASTER
THIS EVENING THAN YESTERDAY EVENING INDICATING THE PRESENCE OF
MARINE AIR. THIS WILL LIKELY BRING SOME LOW CLOUDS UP FROM SONOMA
COUNTY TO THE UKIAH VALLEY LATE TONIGHT. FARTHER NORTH EXPECT A
FEW MORE CLOUDS MAY DEVELOP AROUND HUMBOLDT BAY LATER TONIGHT. MKK

&&

.PREV DISCUSSION... /ISSUED 254 PM PDT SUN JUL 1 2018/

DISCUSSION...AN UPPER RIDGE CONTINUES TO DOMINATE THE E PACIFIC,
WITH HOT TEMPERATURES ONCE AGAIN OVER THE INTERIOR OF NW
CALIFORNIA. HOWEVER, THE PATTERN IS BEGINNING TO CHANGE AS THE
RIDGE IS EXPECTED TO RETROGRADE WESTWARD OVER THE NEXT FEW DAYS
AND AN UPPER TROUGH DIGS S OVER THE W COAST OF THE U.S. THIS WILL
LEAD TO A PRONOUNCED COOLING OF TEMPERATURES ACROSS INLAND
LOCATIONS, PARTICULARLY WITH RESPECT TO DAYTIME HIGHS. MAXIMUM
TEMPERATURES NEAR THE CENTURY MARK OVER PARTS OF THE INTERIOR THIS
AFTERNOON AND AGAIN ON MONDAY WILL DROP INTO THE MID 80S BY
WEDNESDAY AND THURSDAY. A LARGE UPPER LOW WILL DEEPEN AND DROP TO
NEAR 41N/133W WEDNESDAY NIGHT BEFORE FILLING LATER IN THE WEEK.
INDICATIONS ARE THAT, ALTHOUGH ONE LAST BOUT OF HOT CONDITIONS ARE
EXPECTED ON MONDAY, WE SHOULD BE JUST BELOW HEAT ADVISORY
CRITERIA.

MOISTURE FROM TROPICAL DEPRESSION EMILIA AND, LATER, TROPICAL STORM
FABIO WILL BE TAPPED BY SW FLOW AHEAD OF THE AFOREMENTIONED TROUGH
BEFORE IT RETREATS, BRINGING AN INCREASE IN CLOUDS TO THE NW PORTION
OF THE AREA ON WEDNESDAY AND THURSDAY. ALTHOUGH CHANCES FOR RAIN
WILL BE NON-ZERO OVER THE N COASTAL AREAS, HAVE CONTINUED TO KEEP A
DRY FORECAST FOR THE AREA THROUGH THE PERIOD. THERE IS ALSO THE
POTENTIAL FOR SOME LIGHT DRIZZLE ALONG WITH PATCHY FOG ALONG THE
LOWER REDWOOD COAST TUESDAY NIGHT. COASTAL LOW CLOUDS WILL GENERALLY
DEVELOP OVERNIGHT AND DISSIPATE FROM THE LAND-BASED EDGES EACH
MORNING. THESE CLOUDS WILL MAKE THEIR FARTHEST INLAND PENETRATION
TUESDAY NIGHT AND WEDNESDAY MORNING AS THE MARINE LAYER DEEPENS, BUT
STILL SHOULD BE ABLE TO ERODE DURING THE AFTERNOON WITH THE STRONG
DAYTIME HEATING.

TEMPERATURES ARE EXPECTED TO RETURN TO ABOVE NORMAL LEVELS OVER THE
INTERIOR BY NEXT WEEKEND, WHILE SEASONAL VALUES ARE EXPECTED ALONG
THE COAST. /SEC

AVIATION...SOMEWHAT BRISK NORTHERLIES ALLOWED FOR VERY LITTLE
COASTAL MARINE STRATUS DEVELOPMENT OVERNIGHT EXCEPT OFFSHORE OF
CAPE MENDOCINO, AND OVER THE EEL DELTA AND VALLEY. STRATUS FRACTUS
STRANDS POPPED UP NEAR ACV MID-MORNING BUT QUICKLY ERODED. LOCAL
HAZINESS FROM EKA-ACV ALSO CONTINUED THROUGH MORNING. EXPECT
BREEZY TO GUSTY NORTHWESTERLIES ESPECIALLY AT THE COAST TODAY.
THE 24-HOUR TAF PERIOD INDICATES NO WIDESPREAD LOW CLOUDS
REFORMING OVERNIGHT EXCEPT POSSIBLY A LITTLE BIT NEAR THE FAMILIAR
EEL DELTA/HUMBOLDT BAY LOCATIONS. INTERIOR MOUNTAIN & VALLEYS
AREAS WILL REMAIN VFR. /TA

MARINE...N WINDS WILL REMAIN STEADY OR INCREASE A BIT THROUGH
MONDAY WITH GALES CONTINUING IN THE OUTER WATERS INTO TUESDAY. WILL
LIKELY EXTEND BOTH THE OUTER GALE WARNING AND INNER SMALL CRAFT
ADVISORY FOR ANOTHER 12 HOURS OR SO WITH THIS UPDATE. THE PRESSURE
GRADIENT IS THEN EXPECTED TO RELAX AS WE GET INTO TUESDAY AS THE
INLAND THERMAL TROUGH WEAKENS. WINDS ARE EXPECTED TO BECOME LIGHT BY
LATE WEDNESDAY INTO THURSDAY WITH SOME SOUTHERLY FLOW POSSIBLE,
MAINLY N OF CAPE MENDOCINO. /SEC

&&

.EKA WATCHES/WARNINGS/ADVISORIES...
CA...HEAT ADVISORY UNTIL 8 PM PDT THIS EVENING FOR CAZ110-111-113.

NORTHWEST CALIFORNIA COASTAL WATERS...GALE WARNING UNTIL 3 PM PDT TUESDAY FOR PZZ470-475.

     SMALL CRAFT ADVISORY UNTIL MIDNIGHT PDT TUESDAY NIGHT FOR PZZ450-
     455.

&&