Swell Classification Guidelines
Significant: Winter - Swell 8 ft @ 14 secs or greater (11+ ft faces) for 8+ hours (greater than double overhead).
Summer - 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).
Summer - 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.
Summer - up to waist high swell. Also called 'Background' swell.
On Sunday (5/25) in North and Central CA local windswell was producing waves in the waist to chest high range and trashed by northwest winds in the afternoon. Down in Santa Cruz southern hemi swell was producing minimal waves in the waist high range with a few sets to chest high and clean all day. In Southern California up north no rideable surf was occurring with winds on it and chopped. Down south southern hemi swell was producing waves in the waist to chest high range on the sets and fairly chopped in the afternoon. It was cleaner in Southern Orange County. Hawaii's North Shore was flat and clean. The South Shore was still getting some small southern hemi swell with waves waist to about chest high on the sets and textured. Exposed breaks on the East Shore were flat with no real easterly windswell in the water and trades light.
See QuikCASTs for the 5 day surf overview or read below for the detailed view.
No swell producing fetch is occurring or forecast for the North Pacific other than local windswell. Down south one more small gale developed under New Zealand on Sun (5/18) with 40 ft seas aimed east. Swell for HI started Sat (5/24) and CA starting Tues (5/27). Another very weak gale developed in the same area Tues (5/20) with 36 ft seas over a tiny area and then things shut down. No other swell producing systems are forecast in the US swell window.
SHORT- TERM FORECAST
Current marine weather and wave analysis.cgius forecast conditions for the next 72 hours
Surface Analysis - On Sunday (5/25) trades were below 15 kts east of Hawaii with no windswell of interest occurring. Modest high pressure and north winds at 20 to 25 kts were off North and Central CA generating small unremarkable windswell for that area. Over the next 72 hours high pressure is to build off Central California with north winds at 25 kts over a larger area Tues (5/27) and continuing into Thurs (5/29) producing more local north short period windswell at exposed breaks mainly north of Pt Conception. Trades to start building relative to Hawaii on Tues (5/27) at 15+ kts holding into at least Thurs (5/29) generating minimal east windswell for exposed east facing shores. .
On Thursday (5/22) a small gale with 40 kt west winds developed just off the coast of Northern Japan producing a small area of 28 ft seas at 37N 150E aimed at Hawaii up the 302 degree path. Fetch faded from 35 kts in the evening with residual seas 26 ft at 37N 154E (303 degrees HI). Some background swell with period at 15 secs to result for the Hawaiian Islands starting Tues (5/27) at 1.8 ft @ 14-15 secs (2.5-3.0 ft).
North Pacific Animations: Jetstream - Surface Pressure/Wind - Sea Height - Surf Height
On 12Z Sun (5/25) Super Hurricane Amanda, first of the 2014 season, had formed 950 nmiles south of Baja California. Winds were up to 135 kts with seas 35 ft at 11.7N 111.1W on the 160 degree path and 1400 nmiles from Dana Point. This storm turning due north and is to slowly fade over the next 48 hours with winds still 90 kts on Tues AM (5/27) 450 nmiles south of Cabo still on the 160 degree path. Assuming swell of 15 secs is being generated, swell arrival is expected starting Tues PM (5/27) if not earlier.
California Nearshore Forecast
On Sunday AM (5/25) high pressure at 1030 mbs was building in the Gulf of Alaska ridging towards Central and North CA with 20-25 kt north winds in control of outer waters off Point Arena a weak flow over Southern CA. More of the same is forecast but with the gradient starting to build late Monday building in coverage on Tues (5/27) with 25 kt winds covering all of North and Central CA late. SCal to remain protected. More of the same forecast Wednesday and building Thursday (5/29) with near 30 kt north winds off Pt Arena with 20 kt north winds extending south to the north Channel Islands. The gradient to lift north on Friday focused off Cape mendocino with north winds 25 kts and perhaps and eddy flow building into Central CA, the fading in coverage on Saturday only to rebuild Sunday with winds to 30 kts late over Cape Mendocino. 15 kt northwest winds to continue south over all the Central CA coast.
Jetstream - On Sunday (5/25) the jetstream was .cgiit with the two streams running parallel across the South Pacific, merging some in the far Southeast Pacific but not doing anything of interest. No troughs of interest were occurring offering no support for gale development. Over the next 72 hours new wind energy is to start building over the Central Pacific on Mon (5/26) pushing southeast forming a ridge reaching nearly to Antarctica suppressing gale development there. And southwest of New Zealand on Wed (5/28) wind is to be trying to pushing north some, trying to form a trough, but it is to quickly wash out. Beyond 72 hours another pocket of 1450 kt winds to build under New Zealand on Fri (5/30) pushing north forming a bit of a trough there for 24 hours perhaps supporting gale development, but then fading. After that a ridge is to build under New Zealand and feeding into a preexisting ridge over the Central and Southeast Pacific actively suppressing gale development in lower levels of the atmosphere.
Surface Analysis - On Sunday (5/25) swell from a third system that developed under New Zealand (see 3rd New Zealand Storm below) was pushing towards Hawaii and the US West Coast. Yet another smaller system followed on Tues (5/20). The issue with both these systems is that they were generally small with fetch pushing mainly east rather than northeast.
Otherwise low pressure was trying to develop just east of New Zealand with south winds to 45 kts, but it is to fade in 12-18 hours with only 27 ft seas resulting at 12Z mon at 46S 172W, then quickly fading. Maybe a minimal pulse of 15 sec swell is possible for Hawaii with luck.
Over the next 72 hours no swell producing weather systems of interest are forecast.
3rd New Zealand Storm
Another small storm tracked under the southern tip of New Zealand on Sat PM (5/17) with west winds 55 kt over a small area aimed slightly northeasterly with seas building to 40 ft at 52S 168E (HI - shadowed by New Zealand, 218 degs SCal and unshadowed, 217 degs NCal and unshadowed). 50 kt southwest winds held into Sun AM (5/18) with 40 ft seas at 54S 178E (HI 196 degs, SCal 213 degs, NCal 212 degs and not shadowed). 45 kt southwest winds held into the evening with 40 ft seas holding at 54S 172W and aimed decently northeastward (190 degs HI, 208 degs SCal and 207 degs NCal and becoming shadowed). 35-40 kt southwest winds were fading into Mon AM (5/19) with seas fading from 36 ft at 53S 163W (HI 182 degs, 205 degs SCal, 204 degs NCal and shadowed). This system dissipated quickly in the evening with winds barely 35 kts.
A decent pulse of swell is possible for Hawaii arriving late Sat (5/24) with period 19 secs and the US West Coast arriving Mon PM (5/26) with period 20 secs.
Hawaii: Swell to be fading by Mon AM (5/26) at 1.6 ft @ 15 secs (2.5 ft with sets to 3.0 ft). Swell Direction: 191-193 degrees
South CA: Expect swell arrival on Mon (5/26) late pushing 1.4 ft @ 20 secs (2.5 ft). Swell to building into Tues (5/27) at 1.8 ft @ 17-18 secs (3 ft with sets to 4 ft). Swell holding Wed AM (5/28) at 2.5 ft @ 16-17 secs (4 ft with sets to 5 ft) then fading later. Residuals fading Thurs (5/29) from 2.3 ft @ 14 secs (3 ft). Swell Direction: 206-218 degrees
North CA: Expect swell arrival on Mon (5/26) late pushing 1.3 ft @ 20 secs (2.5 ft). Swell to building into Tues (5/27) at 2.1 ft @ 17-18 secs (3.5-4.0 ft with sets to 5 ft). Swell holding Wed AM (5/28) at 2.4 ft @ 16-17 secs (4 ft with sets to 5 ft) then fading later. Residuals fading Thurs (5/29) from 2.1 ft @ 14 secs (3 ft). Swell Direction: 205-217 degrees
Last New Zealand Gale
Another small gale developed just south of New Zealand on Mon PM (5/19) with 40 kt west winds over a small area and seas building from 30 ft at 57S 170E. On Tues AM (5/20) 45 kt west winds were blowing with seas peaking at 36 ft over a small area at 59S 180W. Fetch was fading from 40 kts over a tiny area in the evening with seas fading from 36 ft at 59S 172W. A quick fade to follow.
Minimal sideband energy is possible mainly for the US West Coast, and even that is in doubt given this storms tiny fetch area. Swell arrival in CA roughly Thurs PM (5/29) with swell 1 ft @ 18 secs (2 ft). Swell to fade after that. Swell Direction: 207 degrees
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 high pressure is to hold off North and Central CA into Fri (5/30) at 25 kts then fading some Saturday only to rebuild later Sunday over Cape Mendocino. Windswell to result for exposed breaks. And trades are to hold influenced by this same high relative to Hawaii extending from California the whole way over the Islands. Easterly windswell possible on east facing shores through next weekend. .
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 Sunday (5/25) the daily Southern Oscillation Index (SOI) was down slightly at 13.96. The 30 day average was down some at 2.09 and the 90 day average was rising slightly at -1.88. The near term trend based on the 30 day SOI was indicative of a neutral Phase of the MJO. The longer term pattern was indicative of a neutral Phase of the MJO. The SOI tends to be a lagging indicator running a week behind surface level weather trends.
Current equatorial surface wind analysis indicated neutral anomalies continuing over the Eastern Maritime Continent reaching to the dateline. Neutral anomalies continued east of there extending to a point south of Hawaii, continuing on over the Galapagos Islands. A week from now (6/2) neutral anomalies are forecast north of Australia with neutral anomalies between there and the dateline, continuing neutral south of Hawaii and on into the Galapagos and Central America. In all this suggests the Inactive Phase of the MJO was gone over the dateline with a neutral pattern in control. There was some concern the past weak Inactive Phase in May shut down the transport mechanism to move warm water to the east due to a limited bout of weak easterly anomalies. This was the first supposed stoppage of warm water transport since the beginning of the year, which in and of itself is remarkable (4 solid months of westerly anomalies). So there's a concern that this break in westerly anomalies cut the legs off the evolving warm water pool in the East Pacific. Westerly anomalies need to redevelop in the West Pacific. Interestingly, the most recent TAO array data (from 5/19 into 5/25) suggests that in-fact solid westerly anomalies were in.cgiay near 160E, then fading to light westerly anomalies later in the period, much stronger than what the GFS 850 mb data (which is actually well above surface level) would suggest. The sensors on the buoys are 'hard data' from literally the oceans surface. And the buoys in this region are in good health. This is a good sign.
A previous WWB created a large Kelvin Wave tracking towards South America in January (starting 1/8, peaking 1/28 then fading the first week of Feb) followed by a second strong WWB in Feb-Mar (as strong as the first one starting 2/15 and peaking 2/20-3/2 then fading 3/10) setting up and offering yet more reinforcing transport warm water east. And then a third weak westerly wind burst developed (starting 3/12 and faded out by 3/28). And a fourth weaker one started 4/7 and held through 4/20, and was strong enough to be considered a minimal Westerly Wind Burst WWB. As of right now all this does not mean El Nino is in.cgiay. Still the pattern is something more than coincidental and strongly suggests some degree of pattern change has developed for the tropics. Of historical note: The big El Nino's of '82/32 and '97/98 both started forming in the February timeframe and progressed non-stop through the Summer and Fall months. A article presenting a Comparison between the genesis of the 1997 El Nino and this 2014 WWB event has been posted here.
The longer range models (dynamic and statistical) run on 5/24 are coming more in sync. They both suggest a weak Inactive Phase of the MJO was barely present north of New Guinea. Looking forward an effective dead neutral pattern is to set up per the statistical model for the next 2 weeks while the dynamic model suggests the Inactive Phase getting a little better foothold over the next 10 days, then fading. The ultra long range upper level model suggests the Inactive Phase to get better traction over the West Pacific and is to push east into the East Pacific 6/14. Beyond a very weak Active pattern is to take over starting 6/14 and pushing east into July 4. In all, the pattern is to be very weak. A very weak MJO pattern is what one would expect if an El Nino were to develop - namely that the MJO would all but disappear. That is the hallmark of El Nino. Seeing how by early June (5 days from now) we'll be moving out of the Spring Unpredictability Barrier, the development of a weak to non-existent MJO pattern would be right on-time and expected. So as of right now there is to be effectively only one Inactive Phase for the whole first 6 months of 2014, before we push out of the Spring Unpredictability Barrier and into a weak summer time MJO pattern. Interesting. The upper level model tends to be a leading indicator, with surface level anomalies lagging behind 1 week or more.
The more warm water in the equatorial East Pacific means more storm production in the North Pacific during winter months (roughly speaking). Cold water in that area has a dampening effect. Regardless of what the atmospheric models and surface winds suggest, actual water temperatures are a ground-truth indicator of what is occurring in the ocean. As of the most recent imagery (5/22), a markedly warm water regime is building from Ecuador west over the Galapagos and drifting west from there peaking at 2.6-2.8 deg C above normal with a more modest warm pool ranging in the +0.5-1.0 deg C range extending west from there to the dateline and reaching 5 degrees north and south of the equator. There are embedded warmer pockets in the +1.5 deg C range. Of notice is markedly warmer water now building down into Peru and up into Southern Central America with its core between the Galapagos and Ecuador. The signature warm triangle bound by Peru, Costa Rica and the Galapagos is developing. This pattern only became more pronounced as of the 5/19 update. Still, no waters reaching 3 deg above normal are reported, but it appears we are right on the cusp of that occurring. This area first appeared about 5/1 and is the 'breech point' of a large Kelvin Wave that has been lurking just below the surface for a month now and built by consecutive Westerly Wind burst Jan-April. The larger equatorial warming pattern started in earnest on 3/29 and has been solidifying it's grasp every since, and is being fed by the Galapagos warm pool. Comparing water temp anomalies for this event to the '97 El Nino event, Galapagos waters reached a similar state on 4/25/97 or about 10 days earlier than water temps on 5/5/14. And by 5/10/97 the footprint was marked with +3.5 deg C anomalies. So by 5/22 this 2014 event still has not deepen enough to be considered similar to the '97 event (+3.5 deg C anomalies required, or another +0.7 deg C warmer). That did not happen. Since the Galapagos warm pool has not reach that critical 3.5 deg C anomaly point, there are doubts about how strong this 2014 event will become (as compared to the so called 'Super El Nino' '97 event). But that was the strongest El Nino in recorded history.
We did a quick water temp anomaly comparison to all other El Nino's from '82 to present for the month of April. Only the '82 and '97 El Ninos even had a footprint in the April timeframe, with the exception of the long running '90-'95 event. So to have any warmer than normal water in the Nino 3.4 region in April (the Spring preceding when El Nino is declared) puts this event is an outlier category, presumably meaning some degree of a significant event is developing. There is much variability between El Nino events, and not all are configured identical.That becomes apparent just inspecting the April '82 and '97 data. 2 Super El Ninos, resulted, but with 2 different signatures early on. The theory being the earlier the signature warm pool develops, the stronger it will become. This is a theory that will be put to the test over the next 5 months. But even if it doesn't reach 'super' status, a solid El Nino still looks likely.
Elsewhere the entire North Pacific Ocean is full of warmer than normal water as is the West Pacific (north and south). There is only the weakest signs of high pressure induced upwelling streaming southwest off California, as would be expected for this time of year. This is significant. And the only cool water present is streaming off Southern Chile pushing west almost reaching up to the equator, but getting shunted south by the warm water on the equator. Overall the total amount of warmer than normal water in the North Pacific is impressive. But all eyes remain on the developing breech of warm water along the western coast of Ecuador as a gauge of what's to come atmospherically.
Subsurface waters temps on the equator remain solid. Of great interest is a large area of warm +3-5 deg C above normal water in.cgiace and tracking east with it's core 150 meters down somewhere near 115W. As best as can be identified this Kelvin Wave covers the area from 180W to Ecuador with the core between 140 and 90W. The leading edge is impacting Ecuador and the Galapagos. We've expecting surface water temps to rise rapidly and over a larger area than is currently the case (5/15), but we believe it's just a matter of time with the cutoff date set at 5/20. Given the lack of sensors between 155W and 110W, exact details concerning the core of the Kelvin Wave remain sketchy, but the leading edge waters temps are not in doubt. The Kelvin Wave has also been confirmed via satellite in the form of increased surface water heights at +10 cm from the Galapagos to Ecuador (5/3), with +5 cm anomalies extending west of the dateline. This suggests warm water at depth is di.cgiacing the surface upwards. Also data from the TOA array suggests warm water has again built just west of the dateline at 155W at +3 degs C, likely the result of the 4th WWB in April. So another pulse of warm water is en-route to reinforce the existing warm water currently erupting off Ecuador. And some westerly anomalies are now being reported by the TOA array west of the dateline (see above).
Based on previous history the evolution pattern would follow this general pattern: A large Kelvin Wave will erupt along the South American coast, and the increase in water temps should reduce trades above it (by reducing surface air pressure), which in turn could support yet more warm water build-up (heated by the sun and through reduced upwelling). Aided by yet another WWB in the West Pacific fueled by warm water tracking west from the initial eruption site over the Galapagos) and more eastward moving warm subsurface water, a feedback loop could develop, reinforcing the warm water flow and buildup off Central America into the Fall. But we're a long ways from that occurring just yet. What is needed is another Westerly Wind burst or at least continued westerly anomalies. Anything that reduces or suppresses trades in the equatorial West Pacific will suffice to continue the transport mechanism. So out-and-out west surface winds are not required. Anything that reduced trades in the east (like increasing water temps) will continue to stabilize the warm pool that is hopefully evolving there.
Projections from the CFSv2 model run 5/25 have stabilized. The model had been continuously suggesting some form of warming starting in March 2014 (which did occur) with temps reaching +0.5 in the Nino 3.4 zone by April 1 (also occurred). It now suggests water temps building to +1.0 deg C by early August peaking at +1.75deg C by Nov 2014 (up from previous highs near +1.45 week of May 14). Our guess is that some form of El Nino warning could be declared in the early June timeframe if all stays on track. For reference, the big El Nino of '82/83 was at +2.0 degs and '97/98 was +2.2 degs at their respective peaks). The El Nino of 09/10 was +1.4 degs.
Previously a pattern of mult.cgie strong Westerly Wind Bursts occurred Jan-March 2014, but then moderated in late March, but never gave way to a fully Inactive Phase (with no hint of easterly anomalies west of the dateline) till early May. Then weak eastern anomalies developed May 5 and are to hold through May 15th, then returning to a neutral if not weak westerly flow. This is great news with westerly anomalies in.cgiay for 4 full months and forecast to give way for only 10 day for the first 6 months of 2014. Longterm this signal (suppressed trades in the far equatorial West Pacific) will have to hold into at least August with warm water building greater than 0.5 deg C over the tropical East and Central Pacific (120W to 170W) before one could declare the development of El Nino, though that already appears to be the case. There remains much unknown as we traverse the Spring 'Unpredictability Pattern" (mid-March through early June), though any sort of a total collapse is looking much less likely. But the further into the unpredictability barrier we get with west anomalies continuing, and then into Summer, the lower the likelihood of a total collapse becomes.
Overall the immediate outlook remains unchanged, but potentially trending towards something that would be considered warm by June-July 2014, assuming one is to believe the models and the subsurface water configuration. At a minimum the ocean is in recharge mode, with cold water from the 2010-2011 La Nina dispersed and temperatures on the rise in fit's-and-starts. Regardless of the WWBs etc, we are in a neutral ENSO atmospheric pattern at this time with neither any form of El Nino or La Nina present or imminent. Given all current signs, warming could start developing by May in earnest over the equatorial Pacific possibly increasing during the summer, intensifying into Fall. Monitoring the affects when and if the Kelvin Wave arrives along the equatorial East Pacific will be key to the potential evolution of a warm event. Still there remains 6 months ahead where any number of hazards could derail this event. But this is a better.cgiace than previous years (2010-2011, 2011-2012 and 2012-2013) under the direct influence of La Nina. And it seems apparent we've finally recovered from the 2009-2010 El Nino. In a normal situation one would expect there to be at least one or two years of neutral temperatures ultimately converging in a stronger warmer pattern and possible El Nino 2-3 years out (2015 or 2016). Historically, this is the 'normal' pattern (a few years of false starts post La Nina before a legit El Nino forms). We've turned the corner, but it is still unknown what impact it will have on the atmosphere especially in light of what appears to be a decadal bias towards a cooler regime (since 1998).
See imagery in the ENSO Powertool and more details in the El Nino Update Updated 12/4/13
See a 'Comparison between the genesis of the 1997 El Nino and the 2014 WWB Event' Here (posted 4/5/2014)
Beyond 72 hours no swell producing weather system are projected for our forecast area.
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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Surf Height-Swell Height Correlation Table