On Tuesday (8/30) Northern CA surf was chest to head high and messy (again). South facing breaks were waist to chest high. Central California surf was waist to nearly chest high too. Southern CA breaks from Santa Barbara to just north of LA were waist to shoulder high at the better breaks. The LA area southward into Orange County was also waist high with chest high sets at the best breaks. Southward to San Diego waves were waist to chest high with some bigger sets on occasion. The North Shore of Oahu was flat. The South Shore was thigh to waist high. The East Shore was flat.
Windswell in North California with fading southern hemi swell in the south end of the state was about all there was to report. Neither was outstanding but neither was it flat. Take what you can get. Southern hemi swell is pushing north with the potential for some decent surf in Hawaii by Wednesday and the days beyond. That too is to eventually reach California, but even more diminished in size. There was some suggestions of a storm developing under New Zealand by Thursday or so, but that has since evaporated from the charts. In all it's pretty dismal except for windswell and minimal southern hemi swell. See details below...
SHORT- TERM FORECAST
Current marine weather and wave analysis.cgius forecast conditions for the next 72 hours
On Tuesday (8/28) at the jetstream level the only feature of interest was a small and weak trough in the extreme northeastern Gulf of Alaska. It was incapable of supporting any surface level low development though. A ridge was over the dateline hampering any surface level development in the west (animation here). Over the next 72 hours the Gulf trough is to become a little more energetic but then cycling into Washington by Sunday (9/4) with stronger energy also building over the Kuril Islands, but not indicative of any surface level development initially.
At the surface on Tuesday there was nothing much to report. High pressure at 1028 mbs was filling the Eastern Pacific forming the start of a nice gradient off Cape Mendocino where 25-30 kt north winds and building windswell were confirmed. A little bit of low pressure was tucked into the northern Gulf of Alaska generating some 25 kt west winds aimed at Canada. Otherwise not swell producing features of interest were present (animation here). Over the next 72 hours the big high is expected to drift back to the west positioned northwest of Hawaii with the north wind gradient off Cape Mendocino fading some and low pressure holding if not getting a slightly better foothold in the Gulf of Alaska. Still local windswell for California to likely be the best thing going.
More model data here
California Offshore Forecast
Tuesday mornings local charts (8/30) indicate strong high pressure at 1030 mbs was positioned 1100 nmiles west of South Oregon ridging strongly towards California while weak low pressure was inland, generating the usual summertime pressure gradient of Cape Mendocino with the result being north winds confirmed at 25 to near 30 kts. This is good for generating local short period windswell or a little better. The gradient is to peak out on Wednesday (8/31) with low pressure pushes just barely off the coast, calming the local winds down while the fetch holds off the Cape at 30-35 kts. The high is to fade as low pressure builds in the Gulf of Alaska on Thursday into Friday with near.cgiacid conditions returning. But then on Saturday (9/3) the high is to rebuild and surge east again with north winds on the upswing, strongest by Monday (9/5) with windswell likely on the way up, though period to be in the junky range.
The 5 Day wind forecast is now included with the surf & swell overview in the QuikCAST's.
Tuesdays (8/30) jetstream charts remained unchanged. A big ridge continued pushing under New Zealand and over the Ross Ice Shelf tracking east over Antarctica, totally shutting off the storm corridor there. The northern branch of the jet was flowing zonally (flat) west to east and was not of interest (animation here). Over the next 72 hours no significant change in this pattern is suggested and no upper support for surface level storm development is suggested. A zonally (flat west to east flow) is expected in both branches of the jet.
At the surface today strong high pressure at 1032 mbs was over New Zealand ridging southeast to nearly the edge of Antarctic Ice keeping a lock on the storm corridor there. A second 1032 mb high was in the far Eastern Pacific doing the same things there. No swell producing fetch indicated anywhere in the South Pacific (animation here). Over the next 72 hours the pattern is to remain basically unchanged. Of note was a low forecast in the deep south central Pacific at 948 mbs producing 45-50 kts winds, but they are to be all aimed southeast towards Antarctica and mostly over the Ross Ice Shelf. A second low is to develop in the Tasman Sea sinking southeast, tracking under New Zealand and eventually entering the South Pacific proper on Thursday (9/1) but fading all the while. No swell producing fetch suggested.
More model data here
New Zealand Utility Class Storm
On Tuesday PM (8/23) a 952 mb storm developed south of New Zealand with winds initially confirmed at 50-55 kts over a tiny area centered at 56S 162E aimed northeast towards both Hawaii and the US West Coast. Seas were building. On Wednesday AM (8/24) winds dropped to the 40-50 kts range over the same tiny area aimed almost due north, well at Hawaii. Sea building to 36 ft centered at 56S 165E. But by the evening that fetch faded to near zero and turned it's force more to the east. Seas faded to 30 ft centered at 55S 175E and were fading fast. This system was gone by Thursday AM.The swell has a long way to travel, was generated by a tiny fetch that was short lived. Limited utility class swell possible for Hawaii and California, with Hawaii likely doing best due to it's closer proximity, but certainly nothing much. See QuikCAST's for details.
Marine weather and forecast conditions 3-10 days into the future
Tuesdays (8/30) upper level models indicate that beyond 72 hours a trough is forecast for the dateline a week out ( Tuesday 9/6) with some 140 kt winds wrapping under it, possibly signaling a dent in dominant high pressure that has controlled that region. Will see if the models are right or whether this is just a phantom.
Beyond 72 hours at the surface another low pressure system is to drifting southeast from the Bering Sea into the Gulf of Alaska and towards the Pacific Northwest into early next week. Then high pressure is to again push east shutting off the Gulf and likely firing up the Cape Mendocino gradient again, with windswell generation potential on the increase mid-week for California. This surge in high pressure is also expected to lick up the trades for Hawaii with northeast windswell possibly on the increase by Monday into Tuesday (9/6).
Tuesdays upper level models (8/30) indicate that beyond 72 hours the southern branch is to remain unchanged. Ridge after ridge is to track east across the deep South Pacific and no upper level support for surface level low pressure development is suggested.
Late Wednesday (8/31) a small but strong storm is forecast to develop in the Tasman Sea tracking southeast. 24 hours later it is forecast to drift into the South PAcific with pressure 972 mbs and winds 45-50 kts aimed northeast towards HAwaii and California. It is forecast to bloom on Friday (9/2) sitting in the tiny hole in the jetstream aloft, with pressure down to 952 mbs and winds holding but covering a much larger area. A broad area of 29 ft seas to result, providing good opportunity for utility class swell to push towards Hawaii, though likely well decayed by the time it reaches the California coast. A slow fade is expected on Saturday (9/3). No other swell producing systems forecast.
Details to follow...
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Stormsurf Weather Models Updated Again: Yes, we've been at it again this weekend getting another batch of weather models running. Global coverage is now provided for jetstream forecasts and surface pressure and winds. Zoomed in data is also available for such locations as the Mentawai Islands to Western Australia corridor, Tahiti, South America, Europe and Norwegian Sea. So now you can get local wind forecasts for these and more locations with one click. Take a look here: http://www.stormsurf.com/mdls/menu.html
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Surf Height-Swell Height Correlation Table