On Tuesday (3/21) Northern CA surf was 2-3 ft overhead with bigger waves at elect spots to 4 ft overhead and ugly with southwest winds in effect. South facing breaks in Santa Cruz were chest high and a bit bigger on the sets to shoulder high. Central California surf was chest to head high and lumpy. Southern CA breaks from Santa Barbara to just north of LA were up to waist high at the best breaks and blown out with most thigh high or less. The LA Area southward to Orange County was near flat. Southward from Orange County into San Diego best breaks were waist high. The North Shore of Oahu was head high to maybe one foot overhead. The South Shore was thigh high. The East Shore was chest high.
It isn't over just yet for exposed breaks in California, with windswell providing a steady diet of something rideable and then some. And further out Hawaii is to get in on the action too. The source of swell at both locations is to be a series of gales dropping through the Gulf of Alaska with another developing just north of Hawaii tracking northeast into the Gulf. Just minimal gale force winds expected from all these, but it's sure better than flatness. See details below...
SHORT- TERM FORECAST
Current marine weather and wave analysis plus forecast conditions for the next 72 hours
Tuesdays jetstream (3/21) remained poorly organized with a split flow in-control. A reasonably consolidated flow was pushing off Japan at 140 kts, but split a bit west of the dateline (at 170E). The southern branch was weak, flowing over Hawaii then east past the southern tip of Baja. The northern branch arched steeply north pushing beyond the Aleutians at the dateline then dipped south hard, flowing over the Gulf of Alaska at 150 kts recurving east and weakening while flowing into North California. The pocket off the Pacific Northwest and Canada was the only favorable area for surface level low pressure development in the North Pacific. Over the next 72 hours through Friday (3/24) the broad trough currently positioned in the Gulf of Alaska is to hold though winds are to gradually diminish, reducing this areas ability to support surface level low pressure development. Beyond 72 hours the trough in the Gulf is to slowly move inland over the Pacific Northwest by Saturday (3/25) but a secondary trough is to set up in the same area on Sunday though with lesser energy, slowly pushing east and inland over North CA late Tuesday (3/28). Some weak support for surface level low pressure development expected. Otherwise a split flow to remain over the balance of the North Pacific.
At the surface today another gale was trying to organize in the Gulf. Pressure was 988 mbs with 30-35 kt north west winds confirmed pushing from the eastern most Aleutian Islands southeast towards Oregon and California. Otherwise high pressure at 1028 mbs was positioned 1200 nmiles north west of Hawaii ridging north over the Aleutians and southwest to nearly Baja. The remnants of a broad gale inland of the Southern Kuril Islands was fading out there (see Japan Gale below).
Over the next 72 hours the Gulf of Alaska to be the focus. The gale in the Gulf on Tuesday is to continue Wednesday through Thursday producing a 30-35 kt fetch of northwest winds dropping southeast towards and over Oregon. Seas 20 ft building to 25 ft late Wednesday then fading to the 20 ft range late Thursday pushing southeast into California hitting Thursday through Saturday with swell averaging 5.8-7.0 ft @ 12 secs (7-8 ft faces at exposed breaks in North CA), 5.2-7.3 ft @ 12 secs (6.5-8.5 ft faces Central CA) and 2.3-3.4 ft @ 12 secs (3-4 ft faces South CA).
Also on Thursday (3/23) a tiny 1000 mb cutoff low is forecast to develop just northwest of Hawaii lifting north with 35-40 kts winds and 20 ft seas aimed back at the Islands through Saturday. This to produce north windswell for north facing shore of the Hawaii Islands estimated at 4 ft @ 11 secs (4-5 ft faces) starting late Saturday (4/25) through Sunday and into Monday.
On Sunday (3/19) a low was over North Japan extending out into the Pacific a bit. Pressure dropped to 968 mbs Monday producing about 18 hours of 40-45 kt west winds over open waters just off Northern Japan, in turn generating 25-26 ft seas late evening into early Tuesday. The low tracked north and remained mostly landlocked, pushing west of the Kuril Islands Tuesday. This should produce some small 2 ft @ 13 sec impulse class swell pushing into Hawaii late Saturday (3/25).
No other swell sources forecast.
North Pacific Animations: Jetstream - Surface Pressure/Wind - Sea Height - Surf Height
California Offshore Forecast
On Tuesday (3/21) the models suggest a mostly light winds flow through Monday of next week with the only perturbation being a front pushing through North and Central CA on Friday (3/24) with perhaps some secondary frontal action Saturday. 20 kts south winds and rain accompanying the front Friday then drying our and calming down. No luck by Tuesday though if the Hawaiian cutoff low forms as forecast and pushes in the CA, with brisk south winds and a fair amount of moisture expected all locations. But that's alot of guesswork this far into the future.
The detailed 5 Day wind forecast is now included with the surf & swell overview in the QuikCAST's.
No swell producing fetch forecast over the next 72 hours.
South Pacific Animations: Jetstream - Surface Pressure/Wind - Sea Height - Surf Height
Marine weather and forecast conditions 3-10 days into the future
Beyond 72 hours the cutoff Hawaiian low pressure system is to push far enough north and start tapping jetstream energy in the Gulf of Alaska. Pressure to drop to 988 mbs Monday (3/27) and expanding in areal coverage while 600 nmiles off San Francisco with winds up to near 50 kts but aimed due south, missing Hawaii and passing much of California. Still wrap around fetch to build in the systems south quadrant early Tuesday at 40-45 kts generating 27 ft seas and possibly sending a shot of solid raw swell energy towards Central and South CA from a rather westerly direction and North CA from an almost southwesterly direction. The core of the low to push onshore over North CA late Wednesday.
Beyond 72 hours two small lows are forecast to push under New Zealand, the first late Wednesday (3/22) at 972 mbs producing 45 kt winds and 32 ft seas and the second on Friday (3/25) producing 40-45 kt winds and 32-24 ft seas aimed on a more northerly route. Yet a third broader one forecast for Sunday (3/26) producing 40-45+ kt winds and 37 ft seas. All three to provide some energy for Hawaii to California, assuming the models are accurate. there hasn't been much deviation over the past few days, so odds are improving for a favorable outcome.
Details to follow...
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Surf Height-Swell Height Correlation Table