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Pacific Storm and Surf Forecast
Updated: Thursday, January 9, 2020 4:05 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
1.9 - California & 1.5 - Hawaii
Using the 'Winter' 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 1/6 thru Sun 1/12

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   

Kuril Swell Pushing Towards HI
Another Small Gale Pushing Off Japan

BUOY ROUNDUP
On Thursday, January 9, 2020 :

  • Buoy 233 (Pearl Harbor Entrance)/Buoy 239 (Lanai)/Barbers Point (Buoy 238) : Seas were 2.3 ft @ 12.5 secs with swell 1.0 ft @ 12.5 secs from 197 degrees.
  • Buoy 106 (Waimea): Seas were 7.8 ft @ 11.1 secs with swell 5.1 ft @ 10.1 secs from 43 degrees.
  • Buoy 46025 (Catalina RDG): Seas were 5.3 ft @ 7.1 secs with swell 4.3 ft @ 6.3 secs from 261 degrees. Wind at the buoy was northwest at 20-24 kts. Water temperature 59.9 degs. At Harvest Buoy (071) primary swell was 4.6 ft @ 12.0 secs from 305 degrees. At Santa Monica (028) swell was 2.9 ft @ 6.4 secs from 263 degrees. At Oceanside (045) swell was 2.5 ft @ 8.3 secs from 270 degrees. Southward at Torry Pines Outer (100) swell was 3.4 ft @ 7.9 secs from 283 degrees.
  • Buoy 46012 (Half Moon Bay)/029 (Pt Reyes): Seas were 11.3 ft @ 7.1 secs with swell 8.3 ft @ 7.8 secs from 304 degrees. Wind at the buoy (012) was northwest at 27-35 kts. Water temp 53.8 degs (013), 55.4 degs (012) and 55.4 degs (042).

See Hi-Res Buoy Dashboards (bottom of the page)

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.

Surf Heights for Hawaii should be consider 'Hawaiian Scale' if period exceeds 14 secs.

PACIFIC OVERVIEW
Current Conditions
On Thursday (1/9) in North and Central CA local windswell was producing waves at maybe head high or so and completely blown out with whitecaps in effect. Protected breaks were head high and chopped and raw but not as bad as some exposed breaks. At Santa Cruz surf was up to chest high and warbled and soft and crumbled and weak. In Southern California/Ventura waves were waist high and weak and crumbled and close together but clean. In North Orange Co surf was waist high and a bit warbled and soft and mushed but not chopped but not clean either. South Orange Country's best summertime breaks had waves at knee high and heavily textured. North San Diego's best breaks had waves at waist to chest high and weak and mushed and nearly chopped. Hawaii's North Shore was getting northeast windswell with waves waist to chest high and clean but soft with some northerly warble running through it. The South Shore was flat and clean. The East Shore was getting east windswell with waves 3-4 ft overhead and chopped with strong east-northeast trades.

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

Meteorological Overview
On Thursday (1/9) in California only local windswell was hitting generated by the interaction of weak low pressure that has been tracking east through the Gulf of Alaska and high pressure off the Central CA coast producing seas less than 18 ft. And in Hawaii only east windswell was hitting driven by the same high pressure system off CA. A broad gale developed off the Kuril Islands Mon-Wed (1/8) producing 36 ft seas aimed east, but did not make it east of the dateline. Small swell is pushing towards the Islands. Another small gale is developing Thurs-Fri (1/10) tracking northeast off Japan expected to produce 28-30 ft seas aimed east targeting Hawaii and again not even making it east to the dateline. And a small but solid gale is forecast developing in the Northern Gulf on Fri (1/10) producing up to 37 ft seas aimed southeast, impacting Oregon on Sat (1/11) with swell radiating southeast from there. After that virtually no swell producing weather systems are forecast till maybe Wed-Thurs (1/16) when a local gael is forecast building just off the Pacific Northwest. The Inactive Phase of the MJO is taking its toll.

See all the details below...

 

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

North Pacific

Overview
Jetstream
On Thursday (1/9) the jetstream was consolidated pushing east off Japan forming a weak trough over and just east of the Kuril Islands being fed by 150 kt winds offering some support for gale development mainly over the Kuril Islands. But east of there the jet was weak and split with the split point on the dateline (180W) with the northern branch ridging up through the Northern Gulf then falling southeast down the Canadian and US West coast offering only support for high pressure in the greater Gulf of Alaska. Over the next 72 hours no change is forecast but with winds building in the jet streaming off Japan to 200 kts. But the split point is to hold solid on the dateline. Beyond 72 hours starting Sun (1/12) more of the same is forecast with a persistent trough off or over the Kuril Islands and a significant split locked over the dateline. Interesting but energy levels are to drop in the northern branch of the jet with a highly fragmented track setting up, but resulting in a backdoor trough setting up over the Northeastern Gulf off North Canada starting later Tues (1/14) and falling southeast off British Columbia on Thurs (1/16) perhaps offering some support for low pressure development there. A weak MJO is to be the culprit, not feeding energy into the jet. But, on Thurs (1/16) there's some sense the jet is to start pushing east with the split point moving to 155W. Maybe a change is to start then.


Surface Analysis
On Thursday (1/7) swell from a gale previously off the the Kuril Islands was pushing towards Hawaii (see Kuril Gale below).

Over the next 72 hours starting Wed PM (1/8) a new gale started developing off Japan with 40-45 kt west winds and seas building from 28 ft over a tiny area at 34N 153.5E aimed east. The gale lifted northeast on Thurs AM (1/9) with 40-45 kt west winds and 33 ft seas at 36.5N 164E aimed east. In the evening the gale is to be racing northeast just west of the dateline with 40 kt west winds barely getting any traction with seas 28 ft mainly from previous fetch at 37.5N 173E aimed east. The gale is to be pushing into the Bering Sea from there with no seas aimed east. Something to monitor. Maybe tiny sideband swell to result for Hawaii.

Oahu: For planning purposes expect swell arrival on Sun (1/12) building to 2.4 ft @ 16 secs late (3.5 ft). Swell to continue on Mon (1/13) fading from 2.3 ft @ 14-15 secs early (3.0 ft). The swell to be gone in the evening. Swell Direction: 310 degrees

 

Also a small gale is to develop in the extreme Northeastern Gulf on Thurs PM (1/9) producing west winds at 35-40 kts and seas building. By Fri AM (1/10) 50 kt northwest winds are to be in play over a small area with seas building to 38 ft at 49.5N 143.5W (318 degs NCal) aimed southeast and on the very edge of the North CA swell window. The gale is to fall southeast fast in the evening with 45 kt northwest winds just off Vancouver Island with 38 ft seas at 46.5N 134W aimed southeast and barely in the NCal swell window again (319 degrees). The gale is to be moving onshore over Washington on Sat AM (1/11) with seas from previous fetch 30 ft at 45N 128W impacting Washington and Oregon. Maybe some swell to result for the US West Coast.

NCal: For planning purposes expect swell arrival on sunset Sat (1/11) pushing 10 ft @ 16 secs (16 ft) and well shadowed in the SF Bay Area. Swell fading Sun AM (1/12) from 10 ft @ 15 secs (15 ft) and still shadowed. Residuals on Mon AM (1/13) fading from 6.0 ft @ 12 secs (7.0 ft). Swell Direction: sWELL FADING suN am

 

Kuril Island Gale
On Mon AM (1/6) a broad complex gale formed off North Japan and the Kuril Islands producing pockets of 35- 45 kt northwest winds producing a small area of developing seas at 34 ft up at 46N 168E aimed east. In the evening the gale developed more producing 35-45 kt northwest winds and seas to 25 ft back west at 37N 157E aimed east. 40-45 kt northwest winds held into Tues AM (1/7) resulting in 35 ft seas at 43.5N 160E aimed south to southeast. Fetch was holding in the evening from 40-45 kts with seas 35 ft at 41.5N 164.5E aimed southeast. Fetch faded on Wed AM (1/8) from 35 kts from the west with 32 ft seas fading at 40.5N 173.5E aimed east. The gale was fading and lift northeast in the evening with west winds 35 kts and seas fading from 26 ft up at 41N 179W. The gale dissipated from there. Some small swell to possibly result for Hawaii.

Oahu: Expect swell arrival on Fri afternoon (1/10) building to 3.1 ft @ 18-19 secs later (5.5 ft). Swell to peak overnight and start fading Sat AM (1/11) from 4.6 ft @ 15-16 secs early (7.0 ft). residuals fading Sun AM (1/12) from 2.1 ft @ 13-14 secs (2.5 ft) with northeast windswell present during the duration of this swell. Swell Direction: 311 degrees

 

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

 

Tropical Update
No tropical systems of interest are being monitored.

California Nearshore Forecast
On Thurs (1/9) northwest winds were 20 kts early over North CA and 10-15 kts for Central CA building to 20+ kts for all of California (including Southern CA) later. Light rain sweeping south from North CA to Pt Conception and Southern CA late afternoon. Modest snow for Tahoe mid-day. Fri (1/10) north winds are forecast at 10-15 kts early for North and Central CA dropping to 10 kts later. Light rain for Cape Mendo reaching south to Bodega bay in the evening. On Sat (1/11) northwest winds are forecast at 10-15 kts early for Central CA and 20 kts for North CA building to 20-25 kts later for all of North and Central CA. Light rain mainly for North CA early and focused on Cape Mendocino. Light snow for Tahoe early. Sun (1/12) northwest winds are forecast at 20+ kts all day for North and Central CA. Light rain for Cape Mendocino. Mon (1/13) northwest winds are forecast at 15 kts all day for North and Central CA building to 20 kts for Cape Mendocino later. Light rain for all of North CA all day. Light snow reaching south to Tahoe midday. Tues (1/14) north winds are forecast at 20 kts for Cape Mendocino early and 10 kts south of there early building to 15 kts all location in the afternoon. Light rain for North CA mainly early. Light snow south to Tahoe. Wednesday (1/15) Light winds are forecast for North and Central CA early but 15 kts for Pt Conception early. South winds building to 30 kts at sunset for Cape Mendocino. Rain building for North CA north of Bodega Bay in the evening. Thurs (1/16) southwest winds are forecast at 30 kts for North CA and 15-20 kts for Central CA. Heavy rain building south to Pt Conception through the day. Heavy snow for Tahoe starting late afternoon.

Total snow accumulation for the week for Squaw Valley, Sugar Bowl, Kirkwood and Mammoth at 14, 16, 8 and 0 inches respectively.

Snow Models: http://www.stormsurf.com/mdls/menu_snow.html (Scroll down for resort specific forecasts). Updated!

 

South Pacific

Overview
Surface Analysis
No swell producing fetch is occurring.

Over the next 72 hours no swell producing fetch is forecast.

 

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 a small gale is forecast developing in the Central Gulf on Tues AM (1/14) producing 45 kt northwest winds and 25 ft seas at 48.5N 155.5N aimed southeast. the gale is to fall southeast in the evening with 40 kt northwest winds and seas 28 ft over a pinpoint sized area at 46N 150W aimed southeast. On Wed AM (1/15) the gael is to be falling southeast with 30-35 kts northwest winds and 23 ft seas at 43N 143W aimed southeast. More of the same is forecast in the evening with 23 ft seas off Cape Mendocino at 41N 138W aimed southeast. On Thurs AM (1/16) the gael is to be fading off Cape Mendocino with 30-35 kts northwest winds and 24 ft seas at 41N 133W aimed southeast. Something to monitor.

 

South Pacific

Beyond 72 hours no swell producing fetch of interest is forecast.

 

 

MJO/ENSO Forecast

 

Inactive MJO Holding

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 equator it is in control of, and in it's Active Phase by slackening if not an outright reversing trade winds while enhancing 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 planet, though most noticeable in the Pacific. 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. Prolonged and consecutive Active MJO Phases in the Pacific help support the formation of El Nino. During the Inactive Phase the jet stream tends to split resulting in high pressure and less potential for swell producing storm development. Wind anomalies in the Kelvin Wave Generation Area (KWGA) are key for understanding what Phase the MJO is in over the Pacific. The KWGA is located on the equator from 135E-170W and 5 degs north and south (or on the equator from New Guinea east to the dateline). West wind anomalies in the KWGA suggest the Active Phase of the MJO in the Pacific, and east anomalies suggests the Inactive Phase. In turn the Active Phase strengthens and the Inactive Phase weakens the jetstream, which in turn enhances or dampens storm production respectively in the Pacific.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).

Overview: A double dip La Nina was in control through the Winter of 2017-2018. But warming started building along the South and Central American coast in early March 2018 associated with two upwelling Kelvin Waves, and continued trying to build over equatorial waters over the Summer and Fall, but not enough to declare El Nino and not coupled with the atmosphere. In January 2019, those warm waters were fading, but then rebuilt late in Feb associated with Kelvin Wave (#3). But as of early June 2019 warm water was fading and by August a tongue of cool water was tracking west on the equator from Ecuador over the Galapagos reaching to a point nearly south of Hawaii. El Nino was dead.

LONG-RANGE PACIFIC STORM AND SWELL GENERATION POTENTIAL FORECAST
Fall/Winter 2019/2020 = 5.0/4.0 (California & Hawaii)
Rating based on a 1-10 scale: 1 being the lowest (small and infrequent surf conditions), 5 being normal/average, and 10 being extraordinary (frequent events of large, long period swells)

Rationale: It is assumed the PDO has moved to the warm phase and that a weak borderline El Nino from 2018 is fading out, but not yet completely gone, especially in the atmosphere. Likewise it looks like a La Nina ocean temperature pattern is developing in the equatorial East Pacific, with cooler than normal waters tracking west on the equator. We assumed El Nino like momentum will hold for a while in the atmosphere will take a while to sense that the ocean temperature pattern has changed. But once it does, a turn towards a La Nina like atmospheric pattern will start to develop. that transition is expected in the late Nov-early Dec timeframe. Even so, moderation from the PDO might prevent La Nina from fully developing. Given all that, there is decent probability for a normal start to the Fall surf season (in the Northern Hemisphere) meaning a normal amount of number of storm days and storm intensity, resulting in a normal levels of swell, with normal duration and normal period. But by mid-Dec 2019, the number of storm days, intensity and duration of those storms should start fading and as a result, swell production should fade slightly as well. This pattern is expected to hold through April 2020.

KWGA/Equatorial Surface Wind Analysis & Short-term Forecast (KWGA - Kelvin Wave Generation Area - The area 5 degrees north and south of the equator from 170W to 135E)
Analysis (TAO Buoys): As of (1/8) 5 day average winds were strong from the east over the Eastern equatorial Pacific continuing to the dateline and over the KWGA. Anomalies were neutral over the far East equatorial Pacific continuing over the Central Pacific then modest easterly over the dateline and into the KWGA.
1 Week Forecast (GFS Model): On (1/9) light to modest east anomalies were over the dateline with weak west anomalies over the Western KWGA. The forecast calls for east anomalies building in strength over the dateline from here forward while easing east peaking just east of the dateline on 1/13 holding through the end of the model run. But at the same time west anomalies are to be building in the west KWGA filling 85% of the KWGA by 1/12 and moderately strong holding through the end of the model run.

Kelvin Wave Generation Area wind monitoring model: West and East

Longer Range MJO/WWB Projections:  
OLR Models: (1/8) A solid Active MJO signal was over the Maritime Continent with a equally solid Inactive MJO centered at 170W and straddling the eastern border of the KWGA. The statistic model indicates the Active MJO is to be pushing solidly into the Western KWGA at day 5 moving cleanly into the KWGA at day 10 and continuing filling the KWGA at day 15 and still solid in strength. The dynamic model indicates the same thing but with the Active Phase weakening to modest status at day 15. The 2 models are in sync.
Phase Diagrams 2 week forecast (ECMF and GEFS): (1/9) The statistical model depicts the Active Phase was strong over the Maritime Continent today and is to track east to the West Pacific at day 15, some members fading to weak status while continuing east while one has it building to really strong status. The GEFS model suggests the Active Phase is to build strong over the Maritime Continent at day 2 pushing to the West Pacific at day 7 and strong in strength then stalling and weakening some to moderate status at day 15.
40 day Upper Level Model (assumed to be a statistical mode and 1 week ahead of what is occurring at the surface): (1/9) This model depicts a moderate Active MJO building in the West Pacific today. The Active Phase is to push east while building over Central Pacific and then into Central America on 2/3 while a modest Inactive MJO signal eases into the West Pacific on 1/29 pushing to the East Pacific and Central America at the end of the model run on 2/18.
4 Week CFS Model (850 mb wind): (1/8) This model depicts the Inactive Phase over the eastern KWGA today with weak east anomalies over the far Eastern KWGA today. And weak west anomalies were building over the West KWGA. The Inactive Phase is to push east and out of the KWGA on 1/18 with the Active Phase developing on 1/10 with west anomalies developing strongly in the core of the KWGA 1/14 and both pushing through the KWGA and fading on 1/30. And even at that time solid west anomalies are to be holding in the core of the through the end of the model run on 2/5.
3 Month CFS Model (850 mb wind): (1/9) This model depicts a very weak Inactive Phase of the MJO fading over the dateline today with light east anomalies over the same area. West anomalies were weak over the far west KWGA. The Active Phase is to build while tracking east through the KWGA through 2/14 with strong west anomalies on the dateline 1/15-2/10. After that a weak Inactive MJO pattern is forecast 2/10-3/21 but with weak west anomalies holding in the KWGA. The Active Phase is to follow 3/15 through the end of the model run on 4/7 with weak west anomalies in control. The low pass filter indicates a low pressure bias with 2 contour lines in control of the KWGA centered on the dateline reaching east to the California coast. The second contour line is to hold for the foreseeable future. A high pressure bias built in the Indian Ocean starting 10/22 and is to hold through the end of the model run. A strong area of east anomalies in the Indian Ocean is forecast to dissipate isolated in the Indian Ocean on 3/13.

CFSv2 3 month forecast for 850 mb winds, MJO, Rossby etc - Alternate link

Subsurface Waters Temps
TAO Array: (1/9) Today in the far West Pacific the 30 deg isotherm was rebuilding east stable at 179W while the 29 deg isotherm was building east to 169W today. The 28 deg isotherm line was easing east to 159W today. The 24 deg isotherm previously retrograded to 110W but today was pushing into Ecuador. Anomaly wise, Kelvin Wave #6 was under the dateline at +3 degs tracking from the Maritime Continent moving east with it's leading edge at 115W pushing east. Kelvin Wave #5 has fully pushed into Ecuador. Warm water was filling the entire equatorial subsurface Pacific from 110 meters upwards. The hi-res GODAS animation posted 1/3 indicates warm water had formed a Kelvin Wave extending from 120E under the Dateline east to 120W at +2-3 degrees with lesser warm water pushing east from there then rebuilding to +2-4 degrees and impacting Ecuador (the remnants of Kelvin Wave #5). The GODAS animation appears to be 1 week behind the TAO data but also is more detailed and accurately modeled.
Sea Level Anomalies: (1/3) A broad pocket of +5 cms anomalies is tracking east between 165E-100W. Very weak positive anomalies were in a pocket along Ecuador.

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. All data is from blended infrared and microwave sensors.
Satellite Imagery
Hi-res Nino1.2 & 3.4: (1/6) The latest images (1.2 3.4) indicate weak warm anomalies were fading some but still present from Chile along Peru up to Ecuador then streaming west on the equator over the Galapagos out to the dateline from 10S northward. But they were a little weaker than days past. Weak cool anomalies were south of the equator off Peru and building from 10S to 1S reaching west to 110W. Weak warm anomalies were on and north of the equator building while tracking west to the dateline.
Hi-res 7 day Trend (1/8): Today warming was filling the entire area from Chile and Peru west out to 100W (previously 140W) and also off Ecuador on the equator out to 120W (previously 140W) and stronger in pockets. The short term trend is now towards warming in the Southeast Pacific. This is a step in the right direction.
Hi-res Overview: (1/8) A weak fading area of cool anomalies is holding south of the equator starting at 5S off Peru reaching out to 120W and building back north compared to weeks past. Otherwise gentle warming was along Chile up to Peru lifting north up to Ecuador then pushing west on the equator, out to the dateline. Warmer than normal water was north of the equator reaching north to 20N. Water temps appear to be stable mildly favoring El Nino.
Nino1.2 Daily CDAS Index Temps: (1/9) Today's temps were rising today at +0.456 after bottoming out down at -0.900 on 12/12. Temps peaked prior at +1.55 degrees on 12/2 after a long runup from negative anomalies in October. It now appears we are in a falling trend.
Nino 3.4 Daily CDAS Index Temps:
(1/9) Temps were steady today at +0.494. Temps peaked on 11/14 at +0.509 degs, fell some to -0.018 on 11/28, and are now trying to rebuild. The trend has been steadily generally upwards since Sept when they bottomed out at -0.6 degs (9/14).

Click for Full Sized Image Click for Full Sized Image

CFSV2 Forecast for Nino3.4 Sea Surface Temp (SST) Anomalies & Current SST Anomalies

SST Anomaly Projections
CFSv2 Uncorrected Data (1/7) Actual's indicate a cooling trend set up late summer with temps -0.2 degs in mid-Sept then the trend started rising to +0.25 degs in early Oct holding to Dec 1. The forecast has temps rising to +0.7 degrees on Jan 1 holding till Feb 1 then slowly falling from there to 0.0 in early June then diving negative appearing to be moving to La Nina down at -0.65 in early Sept. According to this model a neutral sea surface temperature pattern biased slightly warm is forecast for the Winter and Spring, then possibly turning towards La Nina in the Summer.
IRI Consensus Plume: The Oct 2019 Plume depicts temps are at +0.25 degs, and are to hold in the +0.25 deg range into May 2020, then fading slightly to +0.15 in June 2020. See chart here - link.

Atmospheric Coupling (Indicating the presence of El Nino in the atmosphere driven by the ocean):
Southern Oscillation Index (SOI) (negative is good, positive bad) (1/9): The daily index was positive today at +7.97 and has been positive the last 6 days. The 30 day average was negative and rising at -6.37. The 90 day average was rising slightly at -5.59, suggesting a neutral ENSO pattern was developing.
ESPI Index (like SOI but based on satellite confirmed precipitation. Positive and/or rising is good, negative and/or falling is bad): Nov +1.03, Oct +0.33 Sept +1.13, August +0.64, July +0.75, June -0.32, May +1.10, April +0.30, March +1.0, Feb +1.29, Jan +0.193. This index has been steadily positive but still indicates mostly ENSO neutral conditions (not El Nino).

Pacific Decadal Oscillation
Per NOAAs index recent values: June 2017 +0.21, July -0.50, Aug -0.62, Sept -0.25, Oct -0.61, Nov -0.45, Dec -0.13, Jan 2018 +0.29, Feb -0.19, Mar -0.61, April -0.89, May -0.69, June -0.85, July -0.09, Aug -0.43, Sept -0.46, Oct -0.75, Nov -0.78, Dec -0.12, Jan -0.23, Feb -0.55 This continues to look like the warm phase of the PDO, even with La Nina, because the warm PDO appears to be dampening the effects of La Nina. No consistently solid negative readings have occurred since Feb 2014
The Washington/JISAO index (Jan-Dec): June 2017 +0.79, July +0.10, Aug +0.09, Sept +0.32, Oct +0.05, Nov +0.15, Dec +0.50, Jan +0.70. Feb +0.37, Mar -0.05, April +0.11, May +0.11, June -0.04, July +0.11, Aug +0.18, Sept +0.09. No real negative readings have occurred since Dec 2013
The PDO turned from a 16 year negative run (Jan 98-Feb 2014) in early 2014 and has been positive ever since (other than a few months of negative readings in Fall 2016, the result of a turn towards La Nina). Looking at the long term record, it is premature to conclude that we have in-fact turned from the negative phase (La Nina 'like') to the positive phase (El Nino 'like'), but the data strongly suggests that could be a possibility. By the time it is confirmed (4-5 years out), we will be well into it.

See imagery in the ENSO Powertool 

****

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


Powerlinessurf Jeff Clark Inside Mavericks

Local Interest

Stormsurf Video Surf Forecast for the week starting Sunday (1/5):
https://www.youtube.com/watch?v=KE0UMm5b2Yo&feature=youtu.be&hd=1
For automatic notification of forecast updates, subscribe to the Stormsurf001 YouTube channel - just click the 'Subscribe' button below the video.

- - -

NBC News - Climate Change and Surfing: https://www.nbcnews.com/mach/science/climate-change-good-surfing-other-sports-not-so-much-ncna1017131

Stormsurf and Mavericks on HBO Sports with Bryant Gumbel https://www.youtube.com/watch?v=luQSYf5sKjQ

Mavericks Invitational Pieces Featuring Stormsurf:
http://www.bloomberg.com/video/how-to-predict-the-best-surfing-waves-EsNiR~0xR5yXGOlOq2MqfA.html
http://www.cbsnews.com/videos/surfs-up-for-mavericks-invitational-in-calif/

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.

Surf Height-Swell Height Correlation Table

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