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Pacific Storm and Surf Forecast
Updated: April 25, 2013 9:31 PM
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 = 2.8 - California & 2.5 - 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 4/22 thru Sun 4/28
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   

Modest New Zealand Swell Heading for HI & CA One More Northwest Pulse for the Islands Too - Then N. Pac Shuts Down

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.

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Current Conditions
On Thursday
(4/25) North and Central CA had surf in the thigh high range with a few waist high peaks at top spots all windswell with a light onshore flow making even the small surf crumbly and weak looking. Down in Santa Cruz waves were near flat except for the southern hemi sets that were waist high pushing chest high at top spots with a light sideshore flow adding texture inside the kelp.  Southern California up north was thigh to waist high on the sets and clean and lined up but fairly weak. Down south southern hemi swell was again showing stronger with sets in the waist to chest high range and occasionally better, well lined up and fairly clean with light texture mid-day. Hawaii's North Shore was getting new north angled Gulf swell with waves 2-3 ft overhead at top breaks on the sets and clean and well lined up. Sure looks fun. The South Shore was flat and clean with light trades in effect. The East Shore was getting limited windswell with waves thigh high and lightly chopped. 

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

Meteorological Overview
Modest southerly angled southern hemi swell was still hitting California, biggest in the south end of the state. Windswell from a long lasting cut-off low in the Western Gulf of Alaska that produced 18 ft seas on Mon-Tues (4/23) was pulsing some along exposed northerly shores of the Hawaiian Islands. A secondary fetch developed a bit east of the dateline Wed-Thurs (4/25) aimed well at Hawaii with seas 17-18 ft, likely providing more windswell for the Islands by Sun (4/28). Beyond, the North Pacific is forecast to go into hibernation for the summer with no swell producing weather systems forecast. Looking south, a small short-lived storm formed southeast of New Zealand on Sun (4/21) lifting northeast with seas 36 ft, then faded fast on Monday. Swell is radiating northeast with some energy expected for Hawaii late this weekend (4/28) and then pushing into California for early next week. But no other swell producing systems are forecast behind. Details below... 

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

North Pacific

Jetstream - This will likely be the last North Pacific jetstream update till Fall arrives. Out focus will shift south for the summer.  On Thursday (4/25) the jetstream was ridging northeast off Japan .cgiitting over Kamchatka with half of the wind energy tracking north even beyond the Bering Sea with the other half tracking east flowing roughly on the 40N latitude. A broad upper low was circulating in the Bering Sea. The branch of the jet tracking over 40N then .cgiit again on the dateline tracking southwest of Hawaii and then into Baja Mexico. High pressure was being supported in between the flows between Hawaii and California. In shore, there was no support for even low pressure development over the greater North Pacific. Over the next 72 hours the upper low in the Bering Sea is to fall south and merge with the branch of the jet tracking east over the 40N latitude setting up another cut-off trough just east of the dateline by Sat (4/27) with 130 kt winds flowing into it. Some support for low pressure development is possible through Mon (4/29). Beyond 72 hours the through is again to .cgiit off and track north up into the Bering Sea then fall back south again feeding the semi-permanent trough just east of the dateline by Thurs (5/2). Again, support for low pressure development is possible just east of the dateline. 

Surface Analysis  -  On Thursday (4/25) weak low pressure associated with a long lasting cutoff low continued circulating in the Western Gulf of Alaska (see Hawaii Cutoff Low below). Otherwise no swell producing fetch of interest was occurring. Over the next 72 hours the Gulf low is to ease northeast, then retrograde back to a point northwest of Hawaii by Sun (4/28) generating up to 30 kt winds in it's north quadrant but all aimed east towards Japan and not aimed at either Hawaii or the US West Coast. 

No easterly trades of interest relative to Hawaii are forecast for the next 72 hours with low pressure in the Western Gulf suppressing high pressure activity near the Islands.  

Limited high pressure is to start building 600 nmiles off Cape Mendocino CA on Sun (4/28) at 1028 mbs generating a weak pressure gradient along the North CA coast generating 20+ kt north winds possibly setting up minimal short period local north windswell at exposed breaks mainly in Central CA.   

Hawaii Cutoff Low - On Wed AM (4/24) the semi-permanent cut-off low east of the dateline pulsed again producing 30-35 kt west winds in it's south quadrant by the evening aimed well at Hawaii with 17 ft seas building at 39N 173E (312 degs HI). Fetch held into Thurs AM (4/25) with 19-20 ft seas indicated at 38N 173W (327 degs HI). Fetch is to be fading fast by the evening with 17 ft seas fading at 40N 168W and not aimed well at the Islands. 

Limited windswell likely building for Hawaii by Sat near sunset at 2.4 ft @ 13 secs (3 ft faces) building overnight peaking Sun AM (4/28) at 4 ft @ 12-13 secs (5 ft). Swell Direction: 310-315 degrees      


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


No tropical systems of interest are occurring.   

California Nearshore Forecast
On Thursday (4/25) weak high pressure at 1024 mbs was just off Oregon and riding northeast into British Columbia. It was generating a very weak gradient producing on 15 kt northeast winds pushing off the South Oregon coast and offering no windswell generation potential. Nearshore a weak eddy flow was in control for South and Central CA.  No real change forecast with the eddy dissolving some Friday (4/26) and the entire gradient gone. By Saturday a light northerly flow is forecast pushing down the CA coast at 10 kts building to 15 kts by late afternoon as high pressure start rebuilding 700 nmiles off Northern CA.  By Sunday that high is to be 1028 mbs and 600 nmiles off the North Coast with a weak gradient starting to building with north winds 20 kts over all of North and Central CA, pushing 25 kts late, and holding if not building to near 30 kts late on Monday, then 35 kts Tuesday AM (4/30).  But the worst of this fetch is to remain well away from nearshore waters of Central CA and clear of Southern CA.  By Wednesday 30 kt north winds to persist over Northern CA as the fetch pushes away from the Central Coast with a full eddy flow back in.cgiay, but with north winds starting to fade late. Thursday the gradient is to be gone with a weak eddy flow in.cgiay for the entire state.     

South Pacific

Surface  -  On Thursday (4/25) fading swell energy from the second of two gale previously in the Southeast Pacific was fading  with most size in Southern CA. A new swell was pushing northeast from a storm that was south of New Zealand on Sun (4/21) (see New Zealand Storm below). Otherwise no swell producing weather systems were occurring. Over the next 72 hours no other swell sources are forecast.  


New Zealand Storm
A new gale started building south of New Zealand on Sat AM (4/20) generating a compact area of 45 kt west winds over ice free waters of the deep Southwest Pacific. Seas on the increase. The Jason-1 satellite made a pass over the fetch and reported seas 29.9 ft with one reading to 33.0 ft where the model indicated barely 30 ft at 63S 173E (18Z). By evening a decent fetch of 50 kt southwest winds were building producing seas to 32 ft at 62S 177W (204 degs CA and totally shadowed by Tahiti, 190 degs HI). On Sun AM (4/21) fetch was fading from 45 kts over a decent sized area aimed well to the northeast with seas 36 ft at 61S 167W (202 degs CA and partially shadowed, 184 degs Hawaii and aimed pretty east of the great circle tracks heading there). The Jason-1 satellite passed directly over the core of the fetch at 18Z and reported seas of 36.0 ft with one reading to 40.4 ft. This was exactly what the model predicted. By evening fetch held at 45 kts aimed well northeast with seas holding at 36 ft at 60S 158W (199 degs for CA and mostly unshadowed, 181 degs HI but mostly aimed east of any track there).  By Mon AM (4/22) residual 40 kt south fetch was still in.cgiay with seas from previous fetch fading from 30 ft at 57S 150W (195 degs CA and unshadowed). At 18Z the Jason-1 satellite passed near the core of the fetch reporting seas 30.2 ft with one reading to 35.1 ft, a bit better than what the model predicted. In the evening residual 35-40 kt south fetch was fading generating 26-30 ft seas at 50S 150W (297 degs CA and unshadowed). All fetch was gone after that. 

A nice but filtered pulse of southwest swell is expecting to result for California and south sideband swell for Hawaii. 

Hawaii: Expect some preliminary swell (from a earlier fetch) arriving on Saturday (4/27) with pure swell 1.6 ft @ 15 secs late (2.5 ft).  The core swell to arrive starting Sunday (4/28) pushing 2 ft @ 17-18 secs late (3.0-3.5 ft faces). Swell holding Mon (4/29) at 2.1-2.3 ft @ 16-17 secs (3.5-4.0 ft) on into Tues (4/30) at 2.5 ft @ 15 secs (3.5 ft). Swell fading on Wed (5/1) from 2 ft @ 13-14 secs (2.5-3.0 ft). Swell Direction: 181-189 degrees   

South CA:  Expect swell arrival on Mon (4/29) with pure swell maybe 1.6 ft @ 20 secs at sunset (3 ft) and inconsistent).  Swell building some on Tues (4/30) with swell building to 2.6 ft @ 18 secs near sunset (4.5 ft). Swell holding Wednesday at 3.3 ft @ 16-17 secs (5.0-5.5 ft with sets to 6.5 ft at top spots).  Swell fading Thursday (5/2) from 3.3 ft @ 15-16 secs (5 ft). Residuals fading on Friday with period 14 secs.   Swell Direction: 195-202 degrees 

North CA:  Expect swell arrival on Mon (4/29) with pure swell maybe 1.0 ft @ 20 secs at sunset (2 ft) and very inconsistent).  Swell building some on Tues (4/30) with swell building to 2.0 ft @ 19 secs near sunset (3.5-4.0 ft). Swell building Wed (5/1) to 2.3 ft @ 17 secs late (4 ft with sets to 5 ft at top spots).  Swell holding Thurs (5/2) at 3 ft @ 16 secs (4.5-5.0 ft with sets to 5.5 ft). Swell Direction: 194-201 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 the cutoff low north of Hawaii is to start fading even early next week and starting to migrate northeast, moving fully into Alaska by Thurs (5/2). No swell of interest is forecast to result.   

The usual summertime pressure gradient is to build along the North CA coast on Mon (4/29) producing a small area of 30 kt north winds perhaps pushing 35 kts making for modest short period north local windswell for Central CA with luck then. The gradient to start fading on Wednesday and be gone by Thurs (5/3) with windswell fading with it.     

No trades of 15 kts or greater are forecast relative to Hawaii until Thurs (5/2) when low pressure hanging north of the Islands finally moves out of the area, with high pressure starting to get a better foothold.  At that time 15 kt trades and limited short period east windswell to start building along east facing shores. 

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 (4/25) the daily Southern Oscillation Index (SOI) was down some at -2.02. The 30 day average was down some to 5.95 with the 90 day average up slightly at 2.29. Overall this is neutral territory and not indicative of El Nino. 

Current equatorial wind analysis indicated neutral anomalies over the Maritime Continent with light east anomalies over the dateline region fading to neutral east of there on into Central America. This indicates the Inactive Phase of the MJO was nearly gone, but not quite. A week from now (5/3) near neutral anomalies are forecast over the Maritime Continent and dateline continuing neutral east of there extending on the equator into Central America. This suggests a neutral Phase of the MJO is to likely be in.cgiay.          

The longer range models (dynamic and statistical) run on 4/24 are in agreement.  Initially both suggest a dead neutral MJO pattern was in control of the equatorial Pacific. No real change is forecast 5 day out.  But by 8 days from now both models suggest just a very weak hint of an Inactive Phase starting to get a toehold over New Guinea easing east through 15 days out, but covering only a tiny area. Interesting but in the Eastern Indian Ocean one model suggests the Inactive Phase building 10 days out while the other suggests the Active Phase taking route.  Clearly neither model has a clue what's going to occur. Best guess is a continued pattern of the atmosphere being slightly biased towards a very weak Inactive Phase. But over-all we expect a continuation of a weak MJO cycle with no support towards development of even a weak El Nino.

The more warm water in the equatorial East Pacific means more storm production in the North Pacific during winter months (roughly speaking). As of now (4/25) a faint pool of slightly warmer water covers the north side of the equator from Ecuador to a point south of Hawaii with slightly cooler water over the same area south of the equator. A tiny thin current of markedly cold water continues tracking off the Central American coast to the Galapagos Islands, then dispersing making no western headway. A .cgiume of slightly cooler than normal water continues radiating off the California coast tracking just southeast of Hawaii and barely making it to the equatorial dateline, typical of the effects of a somewhat stronger than normal East Pacific high pressure system. And it looks like it's gotten cooler, the result of a prolonged burst of northerly winds previously over the CA coast. Subsurface waters temps on the equator continue indicating a stable pool of cooler water (barely -2 deg C) in.cgiace at 150W and down 130 meters, blocking the transport path. A small pocket of slight warmer water appears to be backing up in the West Pacific suggestive of La Nina. It's all shades of gray though. In short, temperatures on the surface are not warming and the subsurface path, though not strongly blocked by cooler water, is not doing anything to transport warm water eastward, even if there was warm water to transport. And the coastal pattern off the US mainland suggests somewhat higher pressure and cooler water temps, all signs of a weak La Nina-like pattern.   

Projections from the CFSv2 model run 4/23 have stabilized. They indicate water temps peaked at Nino 3.4 in early April at (+0.6 degs C) and are slowly falling expected to bottom out in May near normal (+0.1 degs C) and holding there into Jan 2014. A consensus of all the other ENSO models suggest near normal water temps into Summer and early Fall 2013 with no warming indicated. We are in the Spring Unpredictability Barrier where accuracy of all the ENSO models is historically low. So for now the outcome is uncertain, but not trending towards anything that would be considered warm. Historically, if a warm water buildup indicative of any significant El Nino pattern were to occur, it would be starting to happen by now (normally would start building in Feb-Mar).  That is clearly not the case for this year.  Expect a neutral pattern for Winter of 2013-2014. 

We are in a dead neutral ENSO pattern with neither El Nino or La Nina imminent.  But that is a far better.cgiace than previous years (2010-2011 and 2011-2012) under the direct influence of La Nina. We had expected a normal number of storms and swell for the 2012-2013 winter season, but that did not materialize with the pattern looking more like La Nina than anything. This past season was more of a 3 rating than the 5 that was predicted. That said, there was good consistency, with the west dateline area very productive and almost machine-like.  But the storms were very small in areal coverage and rarely made enough eastern headway to  reach over the dateline.  The result was very westerly but reasonably sized utility class swells for the Islands with far smaller and more inconsistent swell energy for the US West Coast.  Longer term the expectation there will be at least one year of neutral to slightly warmer temps (2013-2014) ultimately converging in a stronger warmer pattern and possible El Nino 2-3 years out (2014 or 2015). And historically, this is the 'normal' pattern (a few years of false starts post La Nina before a legit El Nino forms). 

See imagery in the ENSO Powertool and more details in the  El Nino Update Last Updated 10/6/12 


South Pacific

Beyond 72 hours no swell producing fetchis 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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Local Interest

Visit! Boardshorts - Looking for a sick pair of boardshorts? Check out the selection at with brands from O'Neill, Quiksilver and Rusty and free shipping on every order. They won't disappoint.

The Mavericks Invitational Big Wave Surf Contest is scheduled to air on CBS on Thurs (2/7) at 7 PM (PST) r.cgiaying again on Sunday (2/10) at 7 PM.  Set your DVR.

'CBS This Morning' with the Mavericks Invitational Surf Contest - See a nice morning TV show piece on the Mavericks Contest held Sun 1/20/13. The show aired Wed 1/23. Interviews with Colin Dwyer, Jeff Clark, Mark Sponsler and Grant Washburn:

Jaws Redbull Contest Forecast E.cgiained By Stormsurf

Cortes Bank Mission (12/21-12/22/2012)

The Making of 'Chasing Mavericks' - See some background footage on how the movie was made: Part1, Part2

The Psychology of Big Wave Surfing with Greg Long - A must see for any aspiring big wave rider:

Greg Long XCel Core Files - Here's a great profile of Greg Long and his contributions toward pushing the state of big wave surfing. Well Done -

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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