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Pacific Storm and Surf Forecast
Updated: Saturday, May 9, 2015 6:20 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 = 4.0 - California & 2.0- 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 5/11 thru Sun 5/17

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   

Small New Zealand Swell Hitting CA
Stronger South Angled Swell Pushing Towards CA

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, May 10, 2015 :

  • Buoy 51201 (Waimea): Seas were 6.5 ft @ 11.8 secs with swell 3.5 ft @ 11.8 secs.
  • Buoy 46025 (Catalina RDG): Seas were 3.3 ft @ 17.0 secs with swell 1.5 ft @ 16.9 secs. Wind northwest 4-6 kts. In Santa Barbara swell was 0.7 ft @ 17.9 secs from 215 degrees. At Santa Monica swell was 1.6 ft @ 18.6 secs from 217 degrees. Southward from Orange County to San Diego swell was 2.2 ft @ 18.5 secs from 217 degrees.
  • Buoy 46012 & 029 (Half Moon Bay): Seas were 6.3 ft @ 16.7 secs with swell 2.1 ft @ 16.9 secs. Wind calm nearshore. Water temp 51.6 degs.

PACIFIC OVERVIEW
Current Conditions
On Saturday (5/9) in North and Central CA surf was waist to chest high and crumbly but rideable and semi clean at exposed breaks and mostly just local north windswell. Down in Santa Cruz surf was waist to chest high on the rare sets and clean coming from New Zealand. In Southern California up north  southern hemi swell was waist to maybe chest high at top breaks and textured and soft. Down south waves were waist high and weak but clean. Hawaii's North Shore was getting dateline swell with waves head high or a little more and clean and lined up at select breaks. The South Shore was getting New Zealand swell with waves up to chest high at top breaks and clean. The East Shore was getting east windswell at shoulder high and chopped from easterly trades.

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

Meteorological Overview
For the North Pacific relative to Hawaii the models suggest a weak gale forming near the dateline on Tues (5/12) producing 22 ft seas. But that is not believable. Otherwise generic tradewind generated east windswell is expected to continue into early Wed (5/13) then fading out. Relative to the US West Coast, windswell is to redevelop starting later Mon (5/11) then fade on Wed (5/13). No legitimate swell production of interest is forecast. In the southern hemisphere swell from a small but reasonably strong gale developed tucked up along the east coast of New Zealand on Wed-Thurs (4/30) with seas to 38 ft aimed northeast. Small swell is hitting Hawaii and the the US West Coast and to hold for several days, longer for mainland. Another small but fairly potent gale started developing in the Southeast Pacific on Wed (5/6) with up to 44 ft seas late, then fading from 40 ft Thurs AM (5/7) with the core of the gale falling south and barely in the California swell window. Unfortunately no other swell producing weather systems are forecast for the next weak. So flatness is in the long term outlook (other than windswell).  

SHORT- TERM FORECAST
Current marine weather and wave analysis.cgius forecast conditions for the next 72 hours

North Pacific

Overview 
Surface Analysis
On Saturday (5/9) high pressure at 1028 mbs had retrograded to a point 900 nmiles north of Hawaii and 1500 nmiles west of Central CA offering no pressure gradient nor north winds along the US West Coast meaning, there was no source of winds to produce local north windswell. Residual swell from a gale previously over the dateline was hitting Hawaii on Saturday, but is to be gone by Sunday (5/10). Otherwise tradewind generated east windswell was impacting the East Shores of the Islands courtesy of the aforementioned high pressure system north of the Islands.    

Over the next 72 hours high pressure is to hold north of Hawaii continuing to generate trades at 15+ kts relative to the Islands resulting in east windswell. But by later Wed (5/13) the trades are to die as high pressure fades, and windswell is to fade with it. Relative to the mainland the high is to start tracking east by Mon (5/11) with the usual pressure gradient redeveloping over Cape Mendocino CA producing north winds at 20-25 kts and local north windswell starting to develop relative to North and Central CA through Tues (5/12). But a weak low pressure system is to develop in the Eastern Gulf on Wed (5/13) off the Pacific Northwest falling south and is to cut the legs out of the high, with north winds dissipating and windswell gone.  

Also a broad low pressure system is to start developing in the Western North Pacific on Mon (5/11) tracing east-northeast generating a fetch of 35 kt northwest winds late supposedly getting traction on the oceans surface generating 20 ft seas at 34N 169E targeting Hawaii. Those winds are to build to near 40 kts Tues AM (5/12) generating nearly 24 ft seas at 39N 173E again targeting Hawaii. And 35 kts northwest winds to hold into the evening while lifting northeast with seas still near 24 ft at 42N 179E. The gale is to fade after that with it's core over the intersection of the Aleutians and the dateline. If all this comes to pass some degree of small 13-14 sec period swell could result for the Hawaiian Islands. But it's a reach at this early date.

No other swell producing fetch is forecast.

 

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

 

Tropical Update
Typhoon Noul was centered 120 nmiles east-southeast of the north island of the Philippines on Sat AM (5/9) with winds 115 kts tracking northwest. Additional strengthening is forecast this evening with Noul just brushing the coast of the northern island of the Philippines with winds 120 kts, then turning quickly north and then northeast while fading, pushing over the far southern islands south of Japan on Tues (5/12) with winds 65 kts and accelerating to the northeast. The remnants of Noul are to be racing northeast positioned just south of Central Japan (Tokyo) on Wed AM (5/13) with winds 45 kts and then becoming absorbed in a broad low forecast over the dateline later in the workweek and offering no swell producing fetch.  No swell production of interest relative to our forecast area is projected. But, it is interesting that a tropical system would recurve northeast and track the whole way to the dateline in May. Perhaps this is a sign of a changing upper level pattern.

Tropical Depression #7 was still meandering in the far Western Pacific on Sat AM (5/9) with winds now up to 40 kts and turning towards a northwesterly heading. Slow strengthening is forecast as this system tracks northwest into Tues (5/12) with winds pushing typhoon strength (65 kts) and supposedly building to 95 kts by Thurs (5/14) positioned just southwest of Guam. Something to monitor. 

California Nearshore Forecast
On Saturday (5/9) high pressure at 1030 mbs was 1500 nmiles east of Central CA and was retrograding west and not really ridging into the CA coast, with north winds less than 15 kts in most locations. Northwest winds to start rebuilding at 15-20 kts on Sun (5/10) mainly for North CA. Round #2 of high pressure starts Mon AM (5/11) with northwest winds 20-25 kts for all of North and Central CA continuing Tuesday then rapidly in decline Wednesday AM fading from 15 kts as low pressure builds off British Columbia falling south with a light winds pattern in.cgiay Thursday and Friday as remnants of the low push over Central CA late. Light winds are projected on Sat (5/16) too.      

   

   

South Pacific

Overview
Jetstream
On Saturday AM (5/9) the jet was .cgiit with the southern branch ridging south and tracking over Antarctica south of New Zealand with the northern branch tracking north of New Zealand. the two streams merged over the Central Pacific but with all energy running flat west to east (zonal flow) continuing almost to South America before the jet .cgiit again with the southern branch pushing hard south into Antarctica. No troughs of interest were present offering no real support for gale development in lower levels of the atmosphere. Over the next 72 hours much the same pattern is to persist with a .cgiit flow in the West pushing into Antarctica and easing east, recovering over Central and Southwest Pacific only to .cgiit again in the far East under South America. No troughs and no support for gale develop indicated. Beyond 72 hours the ridge in the west is to push east and build taking over the West and Central Pacific by Tues (5/12) and then the entire South Pacific by Sat (5/16) actively suppressing gale formation.


Surface Analysis  
On Saturday (5/9) small swell from a gale that formed just east of New Zealand on Tues (4/28) was still hitting Hawaii and now hitting California (see New Zealand Gale below). Also swell from a storm that developed in the Southeast Pacific was pushing north and east (see Southeast Pacific Storm below).  Otherwise high pressure at 1020 mbs was east of Northern New Zealand generally pushing the storm track south there. A decent gale was trying to organize in the Central Pacific expected to produce 40 kt west winds on Sat PM (5/9) trying to get traction on the oceans surface. Over the next 72 hours that fetch is to build on Sun AM (5/10) with 45 kt southwest winds producing 31 ft seas at 54S 141W over a tiny area. in the evening fetch is to fade from 40 kts from the west winds seas fading from 31 ft at 52S 130W all aimed east. the fetch and seas are to be gone by Mon AM (5/11). limited odds for tiny sideband swell resulting from Southern CA and main targeting Chile and Peru. .

New Zealand Gale
A small gale started developing south of New Zealand on Tues PM (4/28) generating 45 kt south winds with seas building from 26 ft seas at 51S 163E. By Wed AM (4/29) a tiny fetch of 55 kt south winds is to be in.cgiay lifting northeast with seas on the increase from 32 ft over a tiny area at 49S 172E. In the evening winds were tracking northeast and fading from 45 kts with seas building to 38-39 ft over a tiny area at 45S 180W. Winds were fading from 40 kts Thurs AM (4/30) with seas fading from 34 ft up at 41S 176W. This system is to be fading by evening with winds 35 kts and seas mostly from previous fetch fading from 30 ft at 40S 167W. Additional 40 kt southwest fetch to build on Fri AM (5/1) with seas 29 ft at 44S 160W. Fetch is to be fading from 35 kts in the evening and turning more purely westerly with seas to 32 ft at 42S 152W. Fetch is to be fading fast Sat AM (5/2) with winds barely 30 kts and no additional sea production of interest forecast. The bulk of the swell production has already occurred. Secondary 15-16 sec period energy is possibly going to be added if the models verify. Swell from the initial pulse is unshadowed by Tahiti relative to California. Something to monitor.

California (North and South): Swell pushing 2.0 ft @ 15 secs (3 ft) on Sun (5/10). Secondary swell energy from the reformed secondary pulse of this gale to arrive on Mon (5/11) at 1.6 ft @ 17 secs (2.5-3.0 ft) fading some Tues (5/12) from 1.8 ft @ 16 secs (2.5-3.0 ft) then dissipating on Wed (5/13) from 1.5 ft @ 15 secs (2.0-2.5 ft) Swell Direction: 216 degrees initially turning to 213 degrees and becoming shadowed by Tahiti  


Southeast Pacific Storm
A gale briefly formed in the Central South Pacific on Mon PM (5/4) generating a  broad area of 30-35 kt southwest winds with 25 ft seas at 53S 147W. By Tues AM (5/5) southwest winds were holding at 35-40 kts and tracking east with seas building to 26 ft at 54S 145W aimed well northeast. Fetch faded from 30-35 kts in the evening with seas fading from 25 ft at 50S 137W.  Very limited swell production potential is possible from this initial fetch.  it mainly was just a primer for what developed behind. A new fetch starting building well west of it with winds 45 kts over a tiny area aimed east.

By Wed AM (5/6) 50 kt southwest winds were start building in the South Central Pacific aimed well to the northeast with seas building from 29 ft over a tiny area at 54S 144W. A solid area of 50-55 kt southwest winds started developing in the evening with seas building to 41 ft at 55S 137W aimed east-northeast. the Jason-2 satellite made a pass over the eastern quadrant of the storm reporting a 15 reading average of 39.3 ft with one reading to 44.8 ft where the model suggested 37-38 ft seas. The model was on track if not a little low. By Thurs AM (5/7) 50 kt southwest winds are to be on the edge of the CA swell window and fading in coverage while falling southeast with 41 ft seas at 52S 124W and aimed 45 degs east of the 182 degree track to Southern CA. Fetch is to be fading in the evening aimed almost east with seas mainly from previous fetch fading from 40 ft at 57S 118W targeting Chile and east of the California swell window. This system to dissipate by Fri AM (5/8). Some degree of modest sideband swell should result for California, but with the lions share of the fetch targeting Central America down into Northern Chile. for California, low wave count per set (2 waves per set), and sets infrequent. 

Southern CA: Expect swell arrival on Wed (5/13) at 8 AM with period 22 secs and size tiny but building. Swell to become rideable as period hits 20-21 secs late Wed pushing 2 ft @ 20 secs (4 ft). Swell to get solid on Thurs (5/14)  as period hits 18 secs by 10 AM with swell 2.5 ft @ 18 secs (4.5 ft with sets to 5.5 ft) and building to 3 ft @ 17-18 secs late (5 ft with sets to 6.5 ft). Swell holding Fri (5/15) with swell about 3.0 ft @ 16-17 secs early (5.0 ft with sets to 6.0 ft). Swell fading on Sat (5/16) from 2.6 ft @ 15 secs (4 ft).  Swell Direction: 186-200 degrees

North
ern CA: Expect swell arrival on Wed (5/13) at 2 PM with period 22 secs and size tiny but building. Swell to become rideable as period hits 21 secs near sunset. Swell to become decent on Thurs (5/14) as period hits 19 secs by 10 AM with swell 2.5 ft @ 19 secs (4.5 ft with sets to 5.5 ft). Swell holding Fri (5/15) with swell about 2.5 ft @ 17 secs early (4.3 ft with sets to 5.5 ft). Swell fading from 2.3 ft @ 15 secs (3.5 ft) on Sat (5/16). Swell Direction: 184-188 degrees   

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

 

QuikCAST's

 

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

North Pacific

Beyond 72 hours remnant low pressure associated with a previous gale in the Northwest Pacific (details above) are to continue circulating over the intersection of the dateline and the Aleutians on Wed-Sat (5/16) easing slowly east and eliminating any high pressure and potential for development of local north windswell relative to California and windswell producing trades for Hawaii.

MJO/ENSO Update
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).

(1st paragraph in each section is new/recent data. 2nd paragraph where present is analysis data and is updated only as required).
Southern Oscillation Index (SOI) As of Thurs (5/7) the daily SOI was falling hard at -46.90. The 30 day average was falling at -6.16 and the 90 day average was falling from -5.66. The near term trend based on the daily and 30 day average was indicative of a building Active Phase of the MJO. The longer term pattern was indicative of a building Active Phase of the MJO. A new low pressure cell was developing while falling south from a point just south of Tahiti over the weekend into Mon (5/11) with the SOI expected to fall more. After that a weaker high pressure pattern is to develop with a rising SOI likely. The SOI tends to be a lagging indicator.   

Current equatorial surface wind analysis indicated strong westerly anomalies continued in.cgiay over the Maritime Continent reaching to the dateline then turning neutral. weak easterly anomalies develop 1/2 way to the Galapagos and and continuing to the Ecuadorian coast. Down at the surface the TOA array indicated strong  westerly winds to 25 kts (not just anomalies but a reversal of trades) over the eastern Kelvin Wave Generation Area associated with a developing tropical system north of there with anomalies holding to a point just east of the dateline, then turning neutral to the Galapagos. A week from now (5/17) moderate to strong westerly anomalies are to start at 120E (over the Maritime Continent) holding to 170E, then weakening some but reaching over the dateline just north of the equator reaching to a point just south of Hawaii.  Neutral anomalies are forecast east of there to the Galapagos. This suggests the Active Phase (or at least a solid WWB) are to hold if not build a week out (a good sign) and positioned well in the Kelvin Wave Generation Area.  

A moderate Westerly Wind Burst (WWB) developed from 1/15-2/20 then regenerated 2/25 building steadily into the strong category by 3/7, before peaking 3/10 holding to 3/17. A more modest version of it continued into 3/27 then slowly faded into 3/30 but not out even to the end of April. Light westerly anomalies continued to 5/5, then rebuilding again starting 5/7 and starting to peak in the strong category 5/9. This was already a decent event attributable to the Jan-Feb anomalies, before it raged in mid-March. Not a hint of easterly anomalies all year so far. See our new Kelvin Wave Generation Area monitoring model here.

The longer range Outgoing Longwave Radiation (OLR) models (dynamic and statistical) run on 5/8 suggests a dead MJO signal was in.cgiay. No anomalies were occurring over the Pacific. The Statistic model suggests a continuation of the same for the next 15 days while a very weak Active Phase tries to develop in the Indian Ocean but making no headway east. The Dynamic model suggests a dead neutral pattern but with perhaps a weak Active Phase building over the West Pacific 8 days out then fading while the Inactive Phase develops in the Indian Ocean and holding for the next 15 days. For now the models are generally in sync. The ultra long range upper level model run on 5/9 depicts a moderate.cgius strength Active MJO pattern in.cgiay over the Central Pacific and is to ease east reaching Central America on 5/22. A modest Inactive Phase to build in the far West Pacific 5/15 pushing steadily east and fading as if hits Central America on 6/3.  A dead neutral pattern is to set up after that in the West Pacific on 5/27 pushing east and into Central America on 6/18. The upper level model tends to be a leading indicator, with surface level anomalies lagging behind 1 week or more.    

Surface Water Temps: 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 low-res imagery (5/7) a weak warm water/El Nino like regime continues in control of the entire equatorial Pacific definitely getting a better grasp. Warmer water is building over Ecuador and the Galapagos, markedly so per the latest imagery. This is the likely result of a new strong Kelvin Wave impacting the coast there. Warm water is also holding along the Chilean and Peruvian coasts pushing north up to the equator but nothing remarkable. Warmer water extends west from the Galapagos along the equator but only reaching 2-3 degrees south of the equator until it reaches the dateline, then expanding in areal coverage. In reviewing last years data at this same time, the warming is looking stronger, but not over the top.   TAO data indicates +1.0 anomalies are in control over the entire equatorial Pacific, the warmest in years. +2.0-2.5 deg anomalies are now depicted advecting west from the Galapagos. Also the pocket of 1.5 deg anomalies that had been on the dateline has rebuilt with west wind anomalies over it. The CDAS NINO 3.4 Index suggest water temps have backed off some, currently down to +0.9 degs. One would expect this area to start warming after the big Spring Kelvin Wave starts erupting and advecting west, starting maybe a month out (5/28).

Subsurface Waters Temps on the equator are no longer warming but are pushing hard east. As of 5/9 a +2.0 C anomaly flow was in control under the equatorial Pacific from 150 meters up. And a large pocket of +5 deg anomalies was starting to impact the Galapagos Islands driven by the extended WWB that occurred 1/15-2/20 and additional strong westerly anomalies in March, feeding even more warm water into that Kelvin Wave. This Kelvin Wave was expected to start erupting over the Galapagos on roughly 5/1 peaking on 6/10. Actual data suggests it hit on 4/28 and is now starting to erupt on the surface (5/7). Peak water temps still extend westward to 140W, meaning there is a month of peak warm water still in the pipe. Also of interest is the apparent downwelling of more warm water on the dateline , the result of non-stop westerly anomalies in the Kelvin Wave Generation Area. Satellite data from 5/3 depicts 0-+5 cm anomalies over the entire equatorial Pacific east of 175E with a core to +10 cm from 145W to the Galapagos indicative of an open pipe with an embedded solid Kelvin Wave. The latest chart of upper Ocean Heat Content (5/3) indicates +0.5-1.0 deg anomalies are tracking east between 175E and the Ecuador coast with +1.0-1.5 degs from 170W eastward and +1.5 deg anomalies from 152W eastward. And a core of 2 deg anomalies are indicated between 143W eastward with a small pocket of 2.5 degs anomalies at 90W. This also suggests the peak of the Kelvin Wave is still offshore a bit. In short, a strong Kelvin Wave is in flight and starting to impact the Galapagos. See current Upper Oceanic Heat Content chart here

It is do or die time. Either the ocean temps will warm significantly enough to kick off some degree of real El Nino, or it's more Modoki El Nino. We'll know more by June 1. the good news is more westerly anomalies are building over the dateline, suggestive perhaps of developing co.cgiing between the ocean  and the atmosphere (in the classic El Nino sense).   

Pacific Counter Current data as of 5/7 is steadily improving. The current is pushing modestly west to east over the entire equatorial Pacific and with a strong pulse just west of the Galapagos on the equator and again in the far West Pacific. . A very weak easterly current was positioned 2-3 degrees south of the equator. Anomaly wise - modest west anomalies were in control on the equator over the West Pacific north of the equator and building to the strong category in a pocket just west of the Galapagos directly over the equator in the east (120W to Ecuador) and strong over the far West Pacific centered near 130E. Sure looks like El Nino is setting up.

This data suggests a general west to east bias in the current suggesting warm water transport to the east. 

Projections from the monthly CFSv2 model run 5/9 for the Nino 3.4 region remain off the chart. It suggests water temps are at +1.2 deg C (a bit on the high side) and are to steadily warm into July reaching +2.25 degs C, and continuing to +2.9 degs by Oct and +3.15 degs by late Nov, then dropping off. This suggests that perhaps we are moving from a multi-year steady state Modoki event to perhaps a full blown El Nino, and strong at that. But it is too early to believe just yet. The same thing happened last year. The model is likely a statistic model and is just picking up on the Kelvin Wave in flight, and will settle back down after it erupts over the Galapagos. Much more warm water would need to be transported east over the coming 6 months for a legit El Nino to develop (including surface warm water currently locked over the dateline), especially of the magnitude projected by the model (rivaling the all time great '97 El Nino). The mid-March consensus Plume suggests a continuation of Modoki ENSO, though some models are now suggesting something more. See the chart based version here - link. 

Analysis: Mult.cgie downwelling Kelvin Waves generated by suppressed trades and occasional Westerly Wind Bursts occurring late 2013 though 2014 in the West Pacific. Those Kelvin Waves warmed waters over the Eastern equatorial Pacific, but not sufficiently to declare an official El Nino until Feb 2015, and then very weak at that. Still some degree of teleconnection or feedback loop between the ocean and the atmosphere was in.cgiay with some greater force dictating the pattern (possibly the PDO).  The focus now becomes whether this warming and resulting teleconnection will persist if not strengthen in 2015. We are in the Spring Unpredictability Barrier (March-May). The real teller will be during the month of June. Water temps in the Nino 1.2 region are expected to be quite warm due to the arrival of a large Kelvin Wave currently in flight (see details above). If that warming is sufficient to start the classic El Nino feedback loop, then continued westerly anomalies and WWBs should continue through July-Sept and beyond, with a full scale El Nino developing. But if the cool upwelling Phase off the Kelvin Wave cycle develops in mid-June, then it will likely be another year of the Modoki El Nino cycle. The real interesting thing is westerly anomalies are currently in flight over the Kelvin Wave Generation Area (in fact a legit WWB) indicating another Kelvin Wave is in development, much different than what occurred last year. The June to early July timeframe will either make or break development of a legit El Nino. Perhaps a true El Nino teleconnection is developing. But again, the real indicator will occur in June (see above).    

We continue monitoring Westerly Wind Bursts and Kelvin Wave development, suggestive of continued warming East Pacific equatorial waters for the 2015 (meaning enhanced support for the jetstream and storm development in Fall/Winter 2015-2016). 

See imagery in the ENSO Powertool and more details in the  El Nino Update Updated 12/4/13 

 

South Pacific

Beyond 72 hours no swell producing fetch is 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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