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Pacific Storm and Surf Forecast
Updated: August 25, 2012 9:03 AM
Buoys: Northern CA - Southern CA - Hawaii - Gulf of Alaska - Pacific Northwest
Buoy Forecast:
Northern CA - Southern CA - Hawaii - Gulf of Alaska - Pacific Northwest
Pacific Links:  Atmospheric Models - Buoy Data - Current Weather - Wave Models
Forecast Archives: Enter Here
A chronology of recent Mavericks Underground forecasts. Once you enter, just click on the HTML file forecast you want to review (e.g. 073199.html equals July 31, 1999). To view the maps that correspond to that forecast date, select the html file labeled 073199 maps.html
Swell Potential Rating = 1.5 - California & 1.0 - Hawaii
Using the 'Summer' Scale
(See Swell Category Table link at bottom of page)
Probability for presence of largest swells in near-shore waters of NCal, SCal or Hawaii.    
Issued for Week of Monday 8/20 thru Sun 8/26
Swell Potential Rating Categories
5 = Good probability for 3 or more days of Significant swell
4 = Good probability for 1-2 days of Significant swell
3 = Good probability for 3 or more days of Intermediate/Advanced swell
2 = Good probability for  1-2 days of
Intermediate/Advanced swell
1 = Good probability for 3 or more days of Impulse or Windswell
0 = Low probability for 1-2 days of Impulse or Windswell   

Storm Stronger Than Forecast In Southeast Pacific
MJO Barely In the Inactive Phase

Swell Classification Guidelines

Significant: Winter - Swell 8 ft @ 14 secs or greater (11+ ft faces) for 8+ hours (greater than double overhead).
- Head high or better.
Advanced: Winter - Swell and period combination capable of generating faces 1.5 times overhead to double overhead (7-10 ft)
Summer - Chest to head high.
Intermediate/Utility Class: Winter - Swell and period combination generating faces at head high to 1.5 times overhead (4-7 ft).
- Waist to chest high.
Impulse/Windswell: Winter - Swell and period combination generating faces up to head high (1-4 ft) or anything with a period less than 11 secs.
- up to waist high swell. Also called 'Background' swell.

Current Conditions
On Thursday
(8/23) North and Central CA had local north windswell producing waves in the waist high range and a bit textured and crumbly, excluding fog and modest onshore winds. Down south in Santa Cruz surf was effectively flat, but clean at protected breaks. Southern California up north was flat with the usual onshore winds with building chop. Down south southern hemi swell was still producing some waist high  sets and heavily textured if not chopped by northwest wind. Hawaii's North Shore was flat and clean with trades in effect. The South Shore was effectively flat with only windswell wrapping in at knee high or so. The East Shore report was not available.   

See QuikCASTs for the 5 day surf overview or read below for the detailed view

Meteorological Overview
Up north high pressure was ridging into Oregon producing a modest version of the usual pressure gradient along the North California coast resulting in north winds there at 25 kts producing small local northerly windswell at exposed breaks in Central CA.  Trades were modest over the Hawaiian Islands at 15 kts offering only minimal local windswell production. Beyond high pressure is to move stronger to the east through Fri (8/24) with north winds rebuilding to 25 kts solid along the North CA coast resulting in slightly improving local windswell, then fading fast on Saturday as a cutoff low falls down the Pacific Northwest Coast into early next week. high pressure to try and stage a comeback later in the workweek but winds not quite reaching the 25 kt milepost. Trades return at 15 kts or slightly more for Hawaii by Friday (8/24) holding into Saturday providing some limited hope for small east windswell, then becoming a bit less consistent but continuing through Monday before faltering more. No other swell producing weather systems are forecast. 

Down south no swell producing fetch has occurred over the South Pacific relative to our forecast area for a while now. But there's finally some good news:  A moderate gale is developing in the deep Central South Pacific expected to track northeast with seas in the 35 ft range into late Friday, then pausing and redeveloping late Saturday into Sunday with seas up to.38 ft on the southern edge of the California swell window.  Maybe even a little sideband energy possible for Hawaii too.  At this point we'll take anything.  


Current marine weather and wave analysis.cgius forecast conditions for the next 72 hours

North Pacific

Surface  -  On Thursday (8/23) the North Pacific high pressure system was better organized with pressure 1028 mbs centered 750 nmiles west of Oregon and was ridging east forming the usual pressure gradient along the North CA coast generating north winds at 20-25 kts resulting in small and weak short period windswell pushing down the Central CA coast. The southern quadrant of the high was also producing easterly trades over the Hawaiian Islands and open waters east of there at about 15 kts, just barely enough to produce minimal east windswell for the Islands. 

Over the next 72 hours the high is to surge inland over the Pacific Northwest tightening the pressure gradient along the North California coast with north winds building to 25 kts on Fri (8/24) likely increasing the size and period of local windswell some with the swell pushing down the Central CA coast. Nothing remarkable, just rideable. But by Saturday weak low pressure is to be falling down the Canadian Coast cutting the high off and with the approach of the low, north winds to fade fast off North CA and the windswell with it. The low is to produce limited north winds at 15-20 kts, probably not enough to produce meaningful windswell along the Oregon or CA coasts. With the high easing east trades to hold over and east of the Hawaiian Islands at 15 kts through Saturday, incrementally increasing the odds for maybe some rideable windswell along east facing shores, but nothing more. After that trades to still be in the 15 kt range, but becoming spottier with less continuous coverage, resulting in smaller east windswell.  In the extreme West Pacific tropical weather is of interest (see Tropics below).  


  North Pacific Animations: Jetstream - Surface Pressure/Wind - Sea Height - Surf Height


On Thursday (8/23):
Typhoon Tembin was about to make landfall off southern Taiwan with winds 110 kts (125 mph) tracking west. It is to pass over Taiwan then do a full 180 degree turn regaining some winds speed to 105 kts, push back into the West Pacific and start heading north-northeast towards Japan by Tuesday (8/28) but fading with winds down to 65 kts. No swell is suggested for our forecast area.

Typhoon Bolaven was 600 nmiles south of the southern tip of Japan with sustained winds 105 kts tracking slowly northwest. It is expected to continue on a north-northwest track into the weekend with winds building to 120 kts (138 mph) late Saturday and still 400 nmiles south-southwest of Southern Japan. By Monday (8/27) Bolaven is toe just off the southwest coast of Korean with winds down to 100 kts (115 mph) eventually moving inland over North Korea 12n hrs later. No swell is expected for our forecast area.  


California Nearshore Forecast
On Thursday (8/23) a modest north wind flow was in control of North CA waters with winds pushing 25 kts up near Cape Mendocino and an eddy flow building up into Central CA to Pt Arena. This pattern is to become better established and peak Friday AM when winds off Cape Mendo reach 25+ kts with the eddy flow holding over Central CA. An eddy flow to remain over Southern CA through the period. The Cape Mendo gradient is to start fading Saturday from 25 kts early and be gone by Sunday AM as weak low pressure at 1008 mbs drops south from Canada reaching a point off the Oregon coast Monday (8/27) easing inland over the next 24 hrs. As soon as the low pushes inland there late Tuesday high pressure to again start building east with north winds returning over Central CA nearshore waters at 20 kts becoming more focused on Cape Mendocino 24 hrs later and building to near 25 kts. 


South Pacific

Jet stream -  We're thinking of starting to switch jetstream monitoring to the North Pacific. But for now we'll continue Southern Pacific monitoring. 

On Thursday (8/23) the same old .cgiit jetstream pattern remained locked over much of the South Pacific with the southern branch di.cgiaced well to the south running flat east starting down at 73S. But a trough has actually developed in the Central South Pacific with winds to 120 kts pushing almost due north and pushing clear of Antarctic Ice supporting gale formation under it. Over the next 72 hours that trough is to continue to lift north and east while moderating with winds down to 100 kts Friday and relocated to the edge of the CA swell window. Additional wind energy at 140 kts is to push from the West Pacific eastward moving into the remnants of the trough Saturday (8/25) quickly moderating in 24 hours and pushing east and out of the US swell window.  In all some solid support for gale development possible over a multi day period. Beyond 72 hours the jet is to remain temporarily di.cgiaced some to the north averaging on the 59S latitude into Tuesday (8/28), before a new ridge develops in the west and starts sweeping it all southward again. 

Surface  -  At the surface in the South Pacific on Thursday (8/23) a storm was in.cgiace starting to emerge north off the Ross Ice Shelf.  Over the next 72 hours this is to be the only game in town. See details below:


Storm #2S - Southeast Pacific (updated Sat AM 8/25)
On Thursday AM (8/23) a
storm developed over Antarctic Ice with a moderate sized area of 45-50 kt southwest winds becoming exposed over ice free waters north of there with seas building to 34 ft over a modest area at 58S 160W.  The Jason-1 satellite passe south of the fetch at 15Z and reported seas of 36.1 ft with a peak reading to 39.7 ft where the model suggested 32 ft seas. Nice. That fetch lifted north in the evening with winds down to 40 kts and seas modeled at 38 ft at 55S 151W targeting California up the 199 degree path and east of the Tahiti swell shadow. The Jason-1 satellite passed over the north quadrant of the fetch and reported seas of 35.5 ft with a peak reading of 41.2 ft where the model suggested only 32 ft seas.

Winds built Friday AM at 40-45 kts over a smaller area still lifting and aimed north-northeast with seas 36 ft at 51S 144W (194 degs CA).  Again the Jason-1 satellite passed over the south quadrant of the fetch reporting seas of 30.7 ft with a peak at 37.7 ft where the model suggested 28 ft seas. These winds surprisingly held into the evening at 45 kts with seas fading from 36 ft at 46S 138W (191 degs CA). The satellite passed south of the fetch and reported seas at 33.3 ft with a peak to 40.4 ft where the model suggested only barely 28 ft seas.  

Additional 40-45 kts more westerly fetch was forecast Saturday AM (9/25) with 35 ft seas at 47S 128W (186 degs CA) and continuing if not building more solidly at 45 kts into the evening but aimed more if not almost due east. 38-40 ft seas are to be tracking east from 44S 120W and starting to move out of the CA swell window.

45 kt fetch is to be pushing east Sunday AM (8/26) on the edge of the CA swell window with a small area of 40 ft seas building at 45S 113W (out of the CA swell window) tracking fast east and offering only swell for Chile and maybe Peru with 34 ft seas in the CA swell window at 42S 120W. Winds fading from 35 kts in the evening with 30 ft seas fading at 42S 120W (180 degrees CA). A quick fade after that.

This system exceeded expectations and developed stronger than originally forecast. We haven't seen that in a long time. Additionally the Jason-1 satellite made mult.cgie passed over the fetch and the data come back better than what the models were suggesting every time. All passes were over the periphery of the storm, but this suggest s it might have been even stronger than what was modeled. This all looks very promising.  And in regards to California, the storm pushed well to the north likely setting up significant class energy pushing towards the CA coast. Swell is already in the water and pushing north and northeast. Solid energy is also bound down into Central America with additional fetch later in the storm life forecast aimed more to the east, targeting Chile and Peru. And even small sideband energy is to radiating up into Hawaii from the first day of the storms life off Antarctic Ice. Will monitor. 

Hawaii: Expect swell arrival on Wednesday (8/29) moving to 1.5 ft @ 20 secs (3.0-3.5 ft) at sunset. Swell to peak on Thursday (8/30) AM at 1.8 ft @ 18 secs (3.5 ft with sets to 4.0 ft) holding through the day as period drops a little. Residuals on Friday (8/31) with swell fading from 1.6 ft @ 16 secs early (2.5-3.0 ft). Swell fading Saturday (9/1) from 1.4 ft @ 14 secs (2 ft). Swell Direction: 178-180 degrees.

Southern CA: Expect swell arrival starting Thursday (8/30) with period 23 secs dropping to 22 seas late and size maybe to 1.6 ft (3.5 ft with sets to 4.5 ft). On Friday (8/31) size to steadily be on the increasing from 2.6 ft @ 20 secs (5.2 ft with sets to 6.5 ft) pushing to 3.3 ft @ 19 secs late 6.3 ft with sets to 7.8 ft) at sunset. Swell to start peaking overnight into Saturday AM (9/1) at 3.6 ft @ 17-18 secs (6.3 ft with sets to 7.9 ft) and occasional readings to 3.7 ft @ 18 secs (6.5-8.0 ft) with period falling to 17 secs late. Swell from the original fetch to start settling down on Sunday AM (9/2) with swell still in the 3.0-3.3 ft @ 16 sec range (4.8-5.3 ft with sets to 6.6 ft) with additional sideband energy arriving from a very southerly direction at 3.3 ft @ 18 secs (6.0 ft with sets to 7.5 ft) assuming the projections for seas is correct on Saturday evening. Swell Direction: Initially 192-197 degrees turning to 180 degrees

North CA: Expect swell arrival starting Thursday night (8/30) with period 23 secs and size maybe to 1 ft and likely not noticeable. On Friday (8/31) size to steadily be on the increase pushing 2.7 ft @ 19-20 secs at sunset (5.3 ft with sets to 6.5 ft). Swell to start peaking on Saturday AM (9/1) at 3.3 ft @ 18 secs (6.0 ft with sets to 7.5 ft) and occasional readings to 3.6 ft @ 18 secs (6.5-8.0 ft) with period fading towards 17 secs late. Swell from the original fetch to start settling down on Sunday AM (9/2) with swell still in the 3.0-3.3 ft @ 16 sec range (4.8-5.3 ft with sets to 6.6 ft) with additional sideband energy arriving from a very southerly direction at 3.3 ft @ 18 secs (6.0 ft with sets to 7.5 ft) assuming the projections for seas is correct on Saturday evening. Swell Direction: Initially 191-196 degrees turning to 180 degrees


South Pacific Animations: Jetstream - Surface Pressure/Wind - Sea Height - Surf Height




Marine weather and forecast conditions 3-10 days into the future

North Pacific

Beyond 72 hours weak surface low pressure is to be in.cgiace off Oregon on Monday producing no fetch and serving only to break up high pressure off the US West Coast causing windswell to fade. But by Wednesday (8/29) high pressure and the usual north wind regime is to start rebuilding with north winds 20 kts along the North and Central CA coasts and pushing near 25 kts on Thursday (8/30) off North CA. Maybe some small raw north windswell to result then.    

Easterly trades over Hawaii to hold at 15 kts but covering less continuous area east of the Islands starting Monday  (8/27) and holding through the work week unchanged suggesting only small easterly short period windswell at best for that time frame.

No signs of Fall on the models.  

Note: The Madden Julian Oscillation is a periodic weather cycle that tracks east along the equator circumnavigating the globe. It is characterized in it's Inactive Phase by enhanced trade winds and dry weather over the part of the equatorial Pacific it is in control of, and in it's Active Phase by slack if not an outright reversal of trade winds and enhanced precipitation. The oscillation occurs in roughly 20-30 day cycles (Inactive for 20-30 days, then Active for 20-30 days) over any single location on the.cgianet. During the Active Phase in the Pacific the MJO tends to support the formation of stronger and longer lasting gales resulting in enhanced potential for the formation of swell producing storms. During the Inactive Phase the jet stream tends to .cgiit resulting in high pressure and less potential for swell producing storm development. The paragraphs below analyze the state of the MJO in the Pacific and provide forecasts for MJO activity (which directly relate to the potential for swell production).

As of Thursday (8/23) the daily Southern Oscillation Index (SOI) was moving back to positive territory up at 7.46. The 30 day average was up slightly at -11.02 with the 90 day average at -7.48. With the Inactive Phase of the MJO in control one would expect the SOI to be pushing well into positive territory. But two things have been  occurring:  Weak low pressure was pulsating south of Tahiti, and (so far) the Inactive Phase of the MJO has not built anywhere near as strong as what was previously modeled.  All this is consistent with a developing El Nino.  
And the presence of two tropical systems in the far West Pacific (and Typhoon Bolaven developing fairly strong) during the core of the Inactive Phase, also hints to it's weakness.  

Current equatorial wind analysis indicated a broad area of light east anomalies extending from the dateline to the mid- Maritime Continent (WPac). Light east anomalies were also over the far East Pacific into Central America.  This suggests the Inactive Phase was trying to get a foothold, but just barely (a good thing for maintaining the warm water pump).  A week from now (8/31) weak east anomalies are forecast in only small pockets over the Maritime Continent and dateline with neutral anomalies into the East Pacific.  This suggests the Inactive Phase will still hang on for a week, but even that forecast is less than what was suggested a few days ago. If this.cgiays out as forecast, that would not be a bad outcome, suggesting at best an anemic Inactive Phase. 

The longer range models (dynamic and statistical) run on 8/20 (still no update yet) are in agreement suggesting that the Inactive Phase was in.cgiace over the Maritime Continent reaching the dateline area and pushing east. Both suggest the Inactive Phase has peaked, is to hold till 8/25, then is to fall into steep decline by 8/28 day out if not gone. And a weak version of the Active Phase is to be brewing in the Indian Ocean easing into the far West Pacific by 9/1. For now we will continue to.cgiay along and be somewhat concerned this Inactive Phase has the potential to degrade what is already a weak eastward moving warm water transport pattern (feeding the warm pool off Ecuador and Columbia), but current model runs are dampening those concerns.

More warm water in the equatorial East Pacific means more storm production in the North Pacific during winter months (roughly speaking). Warmer than normal water accumulated off Ecuador through 7/2 (part of a continuous pattern that started in Jan 2012) fueled by a Kelvin Wave, weaker than normal trades and a MJO pattern dominated by the Active Phase in early April and a continued weak MJO signal beyond. The warm water pattern peaked on 7/2 in an unmistakable El Nino-like configuration. Updates since then through 8/20 indicated some degradation of the warm pool, but areal coverage actually expanded as was no reaching up into Southern CA. Of most interest was  the start of degradation of cooler than normal waters (as of the 8/23 update) that have dominated between California and Hawaii. Also something that almost looks like weak Kelvin Wave appears to be propagating east both subsurface (2 deg C anomaly) and at the surface (1 deg C anomaly). if this is real, it would help to r.cgienish the warm water pool.  

A weak MJO pattern (both Active and Inactive Phases) is a sign of the weak version of El Nino. Strong Active Phases accompanied by Westerly Wind Bursts (WWB) is a sign of a strong El Nino. Given the data to date, this is looking more like a weak El Nino event at best. As we move into the Fall months (starting late August), the tendency is for whatever pattern has been dominant to only become a.cgiified. In short, the true MJO character will become exposed in Fall, with summer just being a build-up. The expectation is that a near failure of the MJO could occur with trades fading and more slow-but-steady warm water propagation continuing eastward. If this happens the question then becomes: Will it be slow enough and weak enough to turn into a multi-year warm event, or will the atmosphere switch as usual in February 2013 and usher in a new La Nina.  It's way to early to know. 

At this time there is only limited atmospheric evidence of a possible El Nino pattern in.cgiay (as of 8/21).  Remnants of La Nina are still affecting the atmosphere and will likely continue for several months into the middle of Fall (mid-Oct). One such indicator is the continued presence of high pressure over the Eastern Pacific. It has been locked in.cgiace for 2 years now and it's momentum is not going to be easily be halted. The high has caused drought conditions over portions of North America and unrelenting north winds pushing down the California coast and stronger than normal trades over Hawaii. The high is evidenced by a large pool of cooler than normal water radiating southeast off California and over Hawaii reaching the equator at the dateline, the result of enhanced upwelling.  But recent imagery suggest the high is shifting west some and north winds along the California coast are becoming less of an issue, with local water temperatures on the rise. This could be attributed to the change in season, or a fading La Nina, or a combination of both.  We're in a hybrid atmospheric state but the trend is starting to shift more towards the normal category. The longer the MJO remains biased towards a neutral or Active state, and the longer warm water holds if not builds off Central America, and the more the cool pool fades between CA and Hi, the more the atmosphere will respond (especially come Fall) turning towards at least a neutral if not an El Nino-like configuration. The atmosphere is like a big ship, it takes a long time to turn. We remain on the bubble as of this date. Historical Note: It is unusual for El Nino (of any magnitude) to develop directly following 2 years of La Nina.            

As of right now its seems the Active Phases of the MJO are not strong enough to usher in some flavor of real El Nino, but the Inactive Phases are not strong enough to shut off the warm water pump to the East Pacific either.  Regardless, we are effectively past the La Nina hump and the tendency will be for a return to a normal if not slightly El Nino-like enhanced state. All this is way better than where we've been for the past 2 years (under the influence of La Nina).    

See imagery in the ENSO Powertool and more details in the  El Nino update.  


South Pacific

Beyond 72 hours no swell producing weather systems are forecast. 

Details to follow...


External Reference Material: El Nino Southern Oscillation (ENSO), Madden Julian Oscillation (MJO), Pacific Decadal Oscillation (PDO), Southern Oscillation Index (SOI), Kelvin Wave

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Chasing Mavericks - The Jay Moriarty Movie: Two trailers for the new movie about Jay, Frosty and Mavericks has been posted. Movie opens on 10/26/12. Here's the link: &

Props from the Pros:  Stormsurf was mentioned over the past week in two different media sources.  One was in an interview Kelly Slater did with the New York Times and another was in a promotional piece Ramon Navarro did for the Big Wave World Tour. Many thanks to Curt Myers from Powerline Productions for alerting us and of course thanks to Kelly, Ramon and the Tour for using our service. Here's the links:

Steve Colleta Surfboards - Check out surfboards by local shaper Steve Coletta - A long time Santa Cruz local and master shaper. Progressive shapes for North and Central CA waves

Chasing the Swell has been nominated for a Webby Award. See details of this great piece of video journalism below. Some say this is the "Oscars" of online awards.One of the awards is voter based. If you have a moment,.cgiease cast your ballot by going to:, register, then click on the "Get Voting" tab and then to the "Online Film and Video" > "Sports" category and vote for "Chasing the Swell".

Timmy Reyes - Curt Myers from Powerlines Productions found this little gem with Timmy Reyes providing a brief statement about which sites he uses for swell chasing. Thought we'd pass it on. Enjoy:

Buell Wetsuits - When surfing in Santa Cruz, we've been seeing a new wetsuit in the line-up worn by many top flight surfers. They're getting good traction and are well respected. Take a look:

Stormsurf Mobile App (1/9/11) We are proud to announce the official public release of our smartphone mobile app. It provides access to our most popular and commonly used products, optimized for use on the road, on the beach or anywhere you don't have a desktop or laptop.  With a smart phone and signal, you will have access to our data. And we're not talking just a few teaser products - We're talking full feature wave models, weather models, real-time buoy data, manually built forecasts and hundreds of spot wave and wind forecasts enabling you to construct a surf forecast for any location on the.cgianet, all from your cell phone and all for free.  No subscription required and no hidden fees. And better yet, there's a few new things sprinkled in that are not yet available even on our full-featured web site. From your smart phones browser just navigate to: 

Chasing The Swell: Sachi Cunningham from the LA Times spent the entirety of last winter chasing surfers and swells around the North Pacific with her high def video cam. Her timing couldn't have been any better with the project exactly coinciding with the strongest El Nino in 12 years resulting in the best big wave season in a decade. And being an acco.cgiished surfer herself helped her to bring a poignant and accurate account of the what it's like to ride big waves and the new (and some not so new) personalities that are revitalizing the sport. This is must-see material for any surfer or weather enthusiast. Check it out here:

New Weather Models With the activation of our new server we have now released a new block of weather models including North America jetstream, wind and precipitation, local coastal wind forecasts in 1 hr increments and snow and mountain wind forecasts in both 1 and 3 hours increments. The new animations can be found here (look for those items tagged with the New! icon):

New Weather Model Server Stormsurf has installed another weather model production server. This has enabled us to spread the load across more servers allowing us to post both wave and weather model updates much quicker.  Also we are testing new content (like North America jetstream, winds and precipitation, local wind forecasts in 1 hr increments and snow and mountain wind forecasts in both 1 and 3 hours increments). The model menus will be updated shortly with these new links.   

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New Wave Model Facts: Click HERE to read more about the new wave models. Important info.

Time Zone Converter By popular demand we've built and easy to use time convert that transposes GMT time to whatever time zone you are located. It's ion left hand column on every page on the site near the link to the swell calculator.

Stormsurf Google Gadget - Want Stormsurf content on your Google Homepage? It's si.cgie and free. If you have Google set as your default Internet E.cgiorer Homepage, just click the link below and a buoy forecast will be added to your Google homepage. Defaults to Half Moon Bay CA. If you want to select a different location, just click on the word 'edit', and a list of alternate available locations appears. Pick the one of your choice. Content updates 4 times daily. A great way to see what waves are coming your way! .xml

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Surf Height-Swell Height Correlation Table


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