AFDEKA

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE EUREKA CA
446 AM PDT MON JUL 2 2018

.SYNOPSIS...TEMPERATURES WILL GRADUALLY COOL ACROSS THE INTERIOR
THROUGH MID WEEK, AND THEN WARM AGAIN NEXT WEEKEND. OTHERWISE, NO
RAINFALL IS EXPECTED DURING THE NEXT SEVEN DAYS.

&&

.DISCUSSION...AN UPPER RIDGE LOCATED OVER THE NORTHEASTERN PACIFIC
IS FORECAST TO RETROGRADE WESTWARD DURING THE NEXT COUPLE OF DAYS
AS AN UPPER TROUGH DIGS SWD ALONG THE WEST COAST. THIS WILL LEAD
TO A PRONOUNCED COOLING OF TEMPERATURES ACROSS INLAND LOCATIONS,
PARTICULARLY WITH RESPECT TO DAYTIME HIGHS.

THE UPPER TROUGH WILL EVOLVE INTO A LARGE UPPER LOW NEAR 42N/132W
WEDNESDAY NIGHT BEFORE FILLING LATER IN THE WEEK. MEANWHILE,
SUBTROPICAL MOISTURE WILL BE TAPPED BY SW FLOW AHEAD OF THE
AFOREMENTIONED TROUGH...HOWEVER, MODEL GUIDANCE DOES NOT SUPPORT
PRECIPITATION DEVELOPMENT AT THIS TIME. ONE MINOR EXCEPTION WILL
OCCUR WITH MARINE STRATUS DEVELOPMENT TUESDAY NIGHT, WHICH MAY
YIELD PATCHY DRIZZLE ALONG THE COAST.

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

&&

.AVIATION...VFR CONDITIONS WILL PREVAIL AT THE TERMINALS TODAY
THROUGH TONIGHT. ONLY TRANSIENT EPISODES OF MIST AND HAZE ARE
EXPECTED AT THE COASTAL AIRPORTS. ALSO, EXPECT GUSTY NORTH TO
NORTHWESTERLY WINDS AT THE COASTAL TERMINALS BY THIS AFTERNOON.

&&

.MARINE...A TIGHT PRESSURE GRADIENT BETWEEN AN OFFSHORE RIDGE AND
A THERMAL TROUGH NEAR THE COAST WILL CONTINUE TO RESULT IN STRONG
NORTHERLY WINDS AS WELL AS LARGE STEEP SEAS THROUGH TUE. WINDS
NEARSHORE WILL GENERALLY BE LIGHTER EXCEPT AROUND AND DOWNWIND OF
PT ST GEORGE AND CAPE MENDOCINO WHERE GALE GUSTS ARE EXPECTED.
SEAS WILL ALSO BUILD IN RESPONSE TO THE GALE FORCE NORTHERLIES.
SEAS ARE EXPECTED TO HIT 15 TO 17 FEET, ESPECIALLY SOUTH OF CAPE
MENDOCINO TONIGHT. ROBUST NORTHERLIES AND LARGE STEEP SEAS WILL
LIKELY PERSIST INTO TUE BEFORE SLOWLY EASING UP TUE NIGHT.

CONDITIONS WILL IMPROVE SUBSTANTIALLY ON WED AS THE OFFSHORE
RIDGE WEAKENS IN RESPONSE TO A SURFACE LOW FROM THE GULF OF AK.
TRANQUIL MARINE CONDITIONS WITH LIGHT WINDS AND LOW SEAS ARE
EXPECTED FOR THURSDAY AND FRIDAY. NORTHERLY TO NORTHWESTERLY
BREEZES WILL LIKELY START AN UPWARD TREND NEXT SATURDAY AND
SUNDAY.

&&

.EKA WATCHES/WARNINGS/ADVISORIES...
CA...NONE.
NORTHWEST CALIFORNIA COASTAL WATERS...SMALL CRAFT ADVISORY UNTIL
     MIDNIGHT PDT TUESDAY NIGHT FOR PZZ450- 455.

     GALE WARNING UNTIL 3 PM PDT TUESDAY FOR PZZ470-475.

&&