Looks okay not great for the Sonoma Coast. You mentioned Eureka, where do you plan to go diving?
Use this URL and the 10nm out buoy which is PZZ540.
NDBC - NWS Forecast
PZZ540-190430- POINT ARENA TO POINT REYES TO 10 NM- 256 PM PDT TUE SEP 18 2012 ...SMALL CRAFT ADVISORY IN EFFECT FROM WEDNESDAY MORNING THROUGH LATE WEDNESDAY NIGHT...
TONIGHT NW WINDS 10 TO 20 KT. WIND WAVES 2 TO 4 FT. NW SWELL 3 TO 5 FT AT 7 SECONDS. PATCHY FOG AFTER MIDNIGHT.
WED NW WINDS 15 TO 25 KT. WIND WAVES 3 TO 6 FT. NW SWELL 3 TO 5 FT AT 8 SECONDS AND SW 3 FT AT 16 SECONDS. PATCHY FOG IN THE MORNING.
WED NIGHT NW WINDS 15 TO 25 KT. WIND WAVES 3 TO 6 FT. MIXED SWELL NW 4 TO 6 FT AT 8 SECONDS AND S 3 FT AT 16 SECONDS. PATCHY FOG AFTER MIDNIGHT.
THU NW WINDS 5 TO 15 KT. WIND WAVES 1 TO 3 FT. NW SWELL 3 TO 5 FT. PATCHY FOG IN THE MORNING.
THU NIGHT NW WINDS 15 TO 25 KT. WIND WAVES 3 TO 5 FT. NW SWELL 4 TO 6 FT. PATCHY FOG AFTER MIDNIGHT.
FRI NW WINDS 15 TO 25 KT. WIND WAVES 3 TO 6 FT. NW SWELL 5 TO 7 FT. PATCHY FOG.
SAT NW WINDS 15 TO 25 KT. WIND WAVES 3 TO 6 FT. NW SWELL 5 TO 7 FT. PATCHY FOG.
SUN NW WINDS 10 TO 20 KT. WIND WAVES 2 TO 4 FT. NW SWELL 5 TO 7 FT. PATCHY FOG.