The North Pacific jetstream continues to looking decent with a respectable flow pushing west to east over the dateline at 150 kts with a fading trough north of Hawaii feeding into a large ridge over the eastern Gulf of Alaska and US West Coast. The trough continues offering some support for surface level low pressure development. A late season surface gale developed north of Hawaii Tuesday (5/13) in this trough with 40-45 kts winds for 24 hours generating 28-30 ft seas aimed well at California and points north of there. Swell from this system is in the water pushing east, expected to hit the US West Coast on Friday (5/16). Down south a very quiet pattern remains in effect for the greater South Pacific with the jetstream split and displaced to the south. A cutoff low was off northern Chile Mon-Fri (5/16) producing 45-50 kt winds and 28-30 ft seas over a tiny area aimed into the Southern California swell window but generally too far east to affect breaks north of there. Swell arrival expected late Monday (5/19) for exposed breaks in SCal and HI. Typhoon Rammsun peaked out on Saturday (5/10) 600 nmiles south of Southern Japan with winds to 135 kts, but too far away to have any real potential. Of note: The Madden Julian Oscillation (MJO) remains in the active phase, which has likely been fueling both tropical development in the far Western Pacific and the dateline-gale activity of late. It has peaked-out this week, and is expected to slowly fade through next week. One more gale is scheduled for the dateline mid-next week before the North Pacific goes into hibernation for the summer. Otherwise local north windswell expected back in the forecast mid-next week too.

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