Thursday, November 19, 2020
- Buoy 233 (Pearl Harbor Entrance)/Buoy 239 (Lanai): Seas were 2.8 ft @ 15.4 secs with swell 1.4 ft @ 16.1 secs from 247 degrees.
- Buoy 106 (Waimea): Seas were 5.3 ft @ 16.7 secs with swell 2.5 ft @ 16.8 secs from 315 degrees. Water temp 80.6 degs.
- Buoy 46025 (Catalina RDG): Seas were 4.0 ft @ 10.0 secs with swell 2.9 ft @ 10.2 secs from 279 degrees. Wind at the buoy was north at 0-4 kts. Water temperature 59.9 degs. At Harvest Buoy (071) primary swell was 5.5 ft @ 11.8 secs from 296 degrees. At Santa Monica (028) swell was 2.5 ft @ 9.0 secs from 267 degrees. At Oceanside (045) swell was 2.3 ft @ 9.9 secs from 266 degrees. Southward at Point Loma (191) swell was 2.9 ft @ 11.2 secs from 272 degrees.
- Buoy 46012 (Half Moon Bay)/029 (Pt Reyes): Seas were 9.2 ft @ 11.1 secs with swell 7.3 ft @ 10.4 secs from 296 degrees. Wind at the buoy (012) was northwest at 2-4 kts. Water temp 52.3 degs (013), 54.9 degs (SF Bar) and 55.2 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.
On Thursday (11/19) in North and Central CA windswell was producing waves at head high to maybe 2 ft overhead and lined up and glassy but a little uneven. Protected breaks were chest high and clean and lined up. At Santa Cruz surf was chest high or so and and lined up and clean with fog. In Southern California/Ventura waves were waist to chest high and clean and line dup but soft. Central Orange County had waves to head high on the peak and clean with good form and lined up. South Orange County's best summertime breaks had sets at head high and lined up and peeling with a light texture on top. North San Diego had sets at waist high and clean and lined up and soft. Hawaii's North Shore was getting new swell with waves head high on the sets at top spots and a bit warbled from northeast wind. The South Shore had some thigh high sets and clean. The East Shore was getting east windswell with waves waist high and lightly chopped from modest east-northeast trades.
See QuikCASTs for the 5 day surf overview or read below for the detailed view.
On Thursday (11/19) only local north windswell was hitting exposed breaks in North and Central CA associated with a local weather system that developed off North CA and Oregon Tues (11/17) producing 21 ft seas aimed east. Southern CA was seeing small southerly swell from a gale that tracked east through the Southeast Pacific Tues-Thurs (11/12) producing 28-30 ft seas aimed east. Small swell was starting to hit Hawaii from a gale that tracked east over the North Dateline Region on Mon (11/16) then fading with up to 35 ft seas aimed east. That swell is also radiating towards North CA. Beyond some ill formed gale developed over the North Dateline region Wed-Thurs (11/19) producing 21-23 ft seas aimed east and is to track into the Northwestern Gulf Fri (11/20) producing 18-20 ft seas over a broad area aimed east. And perhaps another weak system is to form in the Central Gulf on Sun-Wed (11/23) producing 24-28 ft seas aimed southeast. And perhaps another to follow Wed-Thurs (11/26) in the Northern Gulf with 24 ft seas aimed east.
See all the details below...
SHORT- TERM FORECAST
Current marine weather and wave analysis plus forecast conditions for the next 72 hours
On Thursday (11/19) the jet was split over the West Pacific with two close parallel stream pushing off Japan and the North Kuril Islands with a trough starting to dig out over the North Dateline region being fed by 170 kts winds offering some support for gale development there. East of there a semi fragmented flow was tracking through the Central Gulf and incoherent then pushing into and over North California. Over the next 72 hours the two streams are to consolidate over the width of the North Pacific with the North Dateline trough tracking east into the northern Gulf late Sat (11/21) still offering some support for gale development. A pretty solid ridge is to be behind it locking down the Dateline region late Sat (11/21) then moving over the Gulf on Sun (11/22). Beyond 72 hours starting Mon (11/23) a weak trough is to precede the ridge pushing into North CA and offering some hope for weather there as the ridge moves into the Gulf behind it. But by Tues (11/24) a small trough is to set up in the Northern Gulf perhaps offering some support for gale development while a new trough starts building over the Northwestern Gulf in the evening then building into Thurs (11/26) over the Northern Gulf being fed by 150 kts winds perhaps offering some support for gale development there. At that time the jet is to be consolidated over nearly the width of the North Pacific running due east on the 40N latitude line other than a weak split north of Hawaii. Not too bad a configuration longterm if it materializes.
On Thursday (11/19) swell from a local weather system had produced windswell that was now impacting California (see QuikCASTs for details). And small swell from a gale previously over the North Dateline region was impacting Hawaii (see Another North Dateline Gale below).
Over the next 72 hours an ill formed gale developed off the North Kuril Islands and Kamchatka on Wed AM (11/18) producing 30-35 kt west winds and seas to 23 ft at 50N 172E aimed east. In the evening fetch was fading from 30 kts but with a secondary gale forming just south of the previous fetch producing west winds at 35-40 kts over a tiny area and seas from the original fetch at 21 ft over a small area at 48N 175E aimed east. On Thurs AM (11/19) a new fetch was developing extending from Kamchatka to the North Dateline at 30-35 kts with seas 19-21 ft over that entire area with it's leading edge at 47N 177W aimed east. In the evening the low is to push east into the Western Gulf with 30 kt west winds over a solid area aimed east with 19-21 ft seas over a moderate area extending from 50N 170E to 46N 167W aimed east. Fetch is to fade on Fri AM (11/20) from 25-30 kts over a solid ar in the Northern Gulf with seas fading from 18-20 ft over a solid area at 46N 160W aimed east. In the evening fetch is to fade from 25 kts with seas fading from 19 ft at 46N 156.5W over a solid area aimed east. Something to monitor.
A secondary fetch is to develop Sat AM (11/21) in the Western Gulf at 35 kts from the west with seas 21 ft at 45N 165W aimed east. Fetch is to push east in the Central Gulf in the evening at 35 kts with seas 21 ft over a decent sided area aimed east 47N 153W. On Sun AM (11/22) fetch is to fade from there at 30 kts over the Eastern Gulf with seas 21 ft at 48N 142W aimed east.
Another North Dateline Gale
Another small system started developing just west of the dateline on Sun PM (11/15) producing 45-50 kt northwest winds over a tiny area with 32 ft seas at 47.5N 170.5E aimed east. On Mon AM (11/16) the gale was tracking east with 40 kt west winds over a small area on the North Dateline region with 32 ft seas 48.5N 177.5E aimed east. In the evening the gale is to push east and dissipate over the extreme North Dateline region with seas fading from 25 ft at 50N 176.5W aimed east. Something to monitor.
Hawaii: Expect swell arrival on Thurs (11/19) building to 2.8 ft @ 15 secs later (4.0 ft). Swell fading on Fri (11/20) from 3.1 ft @ 13 secs (4.0 ft). Swell Direction: 320 degrees
North Pacific Animations: Jetstream - Surface Pressure/Wind - Sea Height - Surf Height
No tropical weather system of interest were being monitored.
California Nearshore Forecast
On Thursday (11/19) northwest winds were light early for North and Central CA but are forecast building to 10-15 kts later as high pressure tries to build in. Light mist early lingering for Cape Mendocino. On Fri (11/20) high pressure and north wind takes over at 15-20 kts early mainly off the coast but building to 20-25 kts nearshore for Cape Mendocino in the afternoon. No precip forecast. Sat (11/21) north winds are forecast at 20 kts early off North CA but 10 kts nearshore building to 10-15 kts everywhere north of Pt Conception nearshore in the afternoon. Sun (11/22) northwest winds are forecast at 15 kts holding all day but up to 20+ kts south of Monterey Bay to Morro Bay in the afternoon. A weak front is forecast producing light rain for Cape Mendocino in the afternoon. Mon (11/23) north winds are forecast at near 20 kts early for all of North and Central CA early except Cape Mendocino with light winds pretty much holding there all day. Light rain for Cape Mendocino early. Northwest winds 20-25 kts for Central CA in the afternoon. Tuesday (11/24) north winds are forecast at 15-20 kts for North CA early and 10 kts for Central CA fading to 15 kts in the afternoon for North CA. Wed (11/25) northwest winds are forecast at 15-20 kts for North CA early and 10 kts for Central CA early building up north to 25-30 kts limited to the Pt Arena area. Thurs (11/26) a summer like gradient is to set up over North CA early at 25 kts with light north winds for Central CA fading up north to 20 kts later and light winds over Central CA.
Total snow accumulation for the week for Squaw Valley, Sugar Bowl, Kirkwood and Mammoth at 0 inches, 0 inches, 0 inches, and 0 inches respectively. Freezing level building from 6,000 ft today to 9,500 on Sat (11/21) and holding for the foreseeable future.
Snow Models: http://www.stormsurf.com/mdls/menu_snow.html (Scroll down for resort specific forecasts). Updated!
On Thursday (11/19) swell from one last gale that formed in the far Southeast Pacific was tracking north towards Southern CA (see Last Southeast Pacific Gale below).
Over the next 72 hours no swell producing fetch is forecast.
Last Southeast Pacific Gale
One last gale developed over the Southeast Pacific Tues AM (11/10) producing 35-40 kt west winds and seas 28 ft at 60S 143W aimed east. In the evening that fetch pushed east producing southwest winds at 30-35 kts with seas 28 ft at 57.7S 132.5W aimed northeast. On Wed (11/11) that fetch dissipated but a new fetch of 40 kt west winds built right behind producing a small area of 28 ft seas at 60.5S 146.5W aimed east. In the evening the fetch built with 40-45 kt west winds in the far Southeastern Pacific producing 32 ft seas at 59.5S 131W aimed east. Core fetch and seas moved just east of the Southern CA swell window Thurs AM (11/12) with 28 ft seas lingering at 56.5S 118W barely in the SCal swell window. There some odds for small southern hemi swell to result radiating north towards Southern CA and points south of there.
Southern CA: Swell holding on Thurs (11/19) at 2.3 ft @ 15-16 secs (3.5 ft). Residuals fading on Fri (11/20) from 1.7 ft @ 14-15 secs (2.5 ft). Dribbles on Sat (11/21) fading from 1.6 ft @ 15 secs (2.5 ft). Swell Direction: 195 degrees
North CA: Swell building through the day Thurs (11/19) to 1.8 ft @ 15-16 secs mid-day (2.5 ft). Swell fading on Fri (11/20) fading from 1.4 ft @ 15 secs (2.0 ft). Dribbles on Sat (11/21) fading from 1.3 ft @ 15 secs (2.0 ft). Swell DIrection: 192 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 yet another gale is forecast developing in the Central Gulf on Sun AM (11/22) producing 35-40 kt west winds and seas building from 25 ft at 45.5N 160W aimed east. Fetch is to build in the evening in the Central Gulf at 40 kts with seas 28 ft at 48.5N 162W aimed east-northeast. On Mon AM (11/23) the gale is to start building in the Northern Gulf producing northwest winds at 45-50 kts and seas 28 ft at 51.5N 154W aimed east-northeast. In the evening the gael is to build to storm status in the NOrthern Gulf with 55 kt northwest winds and seas building from 44 ft at 53N 147W aimed east. On Tues AM (11/24) the storm is to fall southeast and fade with 50 kts northwest winds and seas 43 ft at 52N 143.5W aimed southeast. The gael is to track southeast in the evening positioned just off British Columbia with 45 kts northwest winds and seas 42 ft at 51N 136W aimed southeast and outside (east of) the NCal swell window. Something to monitor.
On Tues PM (11/24) another gale is to develop in the Western Gulf with 45 kt west winds and seas building from 22 ft at 45N 168W aimed east. On Wed AM (11/25) winds are to build to storm status at 55 kts from the northwest with seas building from 36 ft aimed southeast. In the evening northwest winds to be 45 kts with seas 42 ft at 50N 158W aimed east. The gale is to fade Thurs AM (11/26) with a broad area of 30-40 kt west winds in-place over the Northwestern Gulf aimed east producing 26-35 ft seas aimed east near 47N 155W. In the evening the gale is to fade with 35 kts west winds and seas 27 ft up at 51.5N 160W aimed southeast. Something to monitor.
Beyond 72 hours no swell producing weather systems of interest are forecast. The southern hemi is going to sleep.
Inactive MJO Peaking Driving East Trades and Cold Anomalies
The Madden Julian Oscillation (MJO) 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.And the El Nino/La Nino cycle (collectively know as ENSO - El Nino Southern Oscillation) is a less frequent (about once every 7 years) but more impactful cycle that affects world wide weather. Specifically, strong El Nino events promote storm production in the Pacific while La Nina events suppress storm production. These therefore have a significant impact on the production of swell and surf. The paragraphs below analyze the state of the MJO and ENSO in the Pacific and provide forecasts for upcoming activity (or inactivity depending on the state and interaction of these two oscillations).
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. A bit of a recovery occurred during Fall of 2019, with weak warm water building in the Nino 1.2 region, but cool water held in a pool off Peru and had not changed until March 2020. By April the cool pool pushed east and by May subsurface cool waters erupted off Ecuador, forming a well defined cool tongue that looked like the start of La Nina, holding into July 2020.
LONG-RANGE PACIFIC STORM AND SWELL GENERATION POTENTIAL FORECAST
Fall/Winter 2020/2021 = 3.0/3.5 (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 in 2014 and that a weak borderline El Nino from 2018 faded out in the Fall of 2019. A La Nina like ocean temperature pattern developed in the equatorial East Pacific in the summer of 2019, then faded and returned to a neutral if not weak warm status during the Winter of 2019-2020 only to return stronger in the Summer of 2020. We have been suspecting a turn towards a La Nina like atmospheric pattern to develop in the late Winter/early Spring of 2020. Our best hope is that moderation from the warm phase of the PDO might tamp down development of a full blown La Nina as we move into 2020. But at this time that does not appear likely. Given all that, for the 2020 there is decent probability for development of La Nina meaning a reduced number of storm days and storm intensity during the summer season, resulting in a below normal level of swell, with swell being below normal duration and period. And by the Fall and early Winter of 2020/21, the number of storm days, intensity and duration of those storms should fade even more, resulting in depressed swell production. This pattern is expected to hold through the Spring of 2021.
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 (11/18) 5 day average winds were strong from the east over the Eastern equatorial Pacific continuing over the Central Pacific and strong over the KWGA. Anomalies were weak from the east over the East equatorial Pacific continuing over the Central Pacific and modest easterly over the KWGA. (Note: These are 5 day average winds, so they lag what is happening today by about 2 days).
1 Week Forecast (GFS Model): On (11/19) strong east anomalies were over the KWGA. The forecast calls for east anomalies building steadily in density at strong status over the KWGA through the forecast period ending 11/25 and building over the East Pacific to a point south of California at the end of the model run. Support for energy transfer into the jet is weak and is expected to be getting progressively weaker.
Kelvin Wave Generation Area wind monitoring model: West and East
- Longer Range MJO/WWB Projections:
OLR Models: (11/18) A moderate Inactive MJO signal was over the KWGA today. The statistic model indicates the Inactive Phase is to start fading and tracking east on day 5 of the model run then fading on day 10 and gone on day 15 with a weak Active MJO building over the west KWGA. The dynamic model suggests much the same thing but with the Inactive Phase completely gone on day 10 and no Active Phase building on day 15 with a dead neutral pattern in play.
Phase Diagrams 2 week forecast (ECMF and GEFS): (11/19) The statistical model depicts the Active Phase was modest over the Central Indian Ocean today and is to track east to the Maritime Continent and very weak on day 15. The GEFS model suggests pretty much the same thing but moving fast east over the far West Pacific.
40 day Upper Level Model (assumed to be a statistical mode and 1 week ahead of what is occurring at the surface): (11/18) This model depicts a moderate Inactive Phase (dry air) over the Central and East Pacific tracking east while fading pushing into Central America on 12/3. A moderate Active Phase is to set up over the West Pacific on 11/28 pushing east and into Central America on 12/23. On 12/18 another Inactive/Dry Phase is forecast pushing over the KWGA reaching the Central Pacific at the end of the model run on 12/28.
4 Week CFS Model (850 mb wind): (11/18) This model depicts the Inactive Phase of the MJO was building over the KWGA today with strong east anomalies over the core of the KWGA and reaching east to nearly a point south of California. The forecast indicates east anomalies are to hold in coverage and strength filling the KWGA and holding through 11/26 as the Inactive Phase pushes east and then out of the KWGA. Beyond strong east anomalies are to hold filling the KWGA and east to a point just south of California for the foreseeable future or at least through the end of the model run on 12/16.
3 Month CFS Model (850 mb wind): (11/19 - using the 4th/latest ensemble member): This model depicts the Inactive Phase of the MJO was near peaking over the KWGA with east anomalies in control. The Inactive Phase is to pushing over the KWGA through 12/29 producing east anomalies initially filling the KWGA and points east of there to Ecuador. A modest Active Phase is to follow on 12/7-1/30 producing only limited west anomalies in the KWGA with east anomalies holding solid over the East Pacific. A weak Inactive MJO is to return 1/30 with weak west anomalies over the west KWGA and east anomalies holding strong over the East Pacific through the end of the model run on 2/16. The low pass filter indicates a high pressure bias is firmly in control over the dateline today with 2 contour lines reaching east to a point south of California and is to continue through the end of the model run with it's western periphery easing east to 150E at the end of the model run. A third contour line is to appear on 12/10 with a fourth contour line on 1/17. A single contour low pressure bias is over the Indian Ocean today and is to build in coverage holding through the end of the model run and its eastern periphery easing east to 140E at the end of the model run. Its core is to remain locked at 80E. A second contour is to develop on 12/22-2/8 then fading. East anomalies that have been previously solid in the Indian Ocean for over a year previous migrated east through the West Pacific to the East Pacific on 10/1 and are forecast stabilizing there for the foreseeable future. The trend is towards a building La Nina that is not likely to be dislodged anytime soon. This is turning into a 2 year event.
CFSv2 3 month forecast for 850 mb winds, MJO, Rossby etc - Alternate link
Subsurface Waters Temps
TAO Array: (11/19) Today in the far West Pacific the 30 deg isotherm was gone. The 29 deg isotherm was stable at 160E today. The 28 deg isotherm line was easing east slightly to 178E today. The 24 deg isotherm was backtracking to 135W today. Anomaly wise, warm anomalies +2 deg C were steady in the West Pacific pushing east to 160W at depth today but no warmth east of there and no sign of moving anytime soon. The non-stop cold anomaly pocket at -3 degs was near 120W with cool anomalies filling the entire area east of the dateline and shallower west to 150E. The hi-res GODAS animation posted 11/14 indicates the same with a large cool water bubble at depth stronger and larger erupting to the surface from 160E eastward to Ecuador with a core to -5C at 130W. The GODAS animation appears to be 1 week behind the TAO data but also is more detailed and accurately modeled.
Sea Level Anomalies: (11/14) Negative anomalies were forming a wave pushing west from the Galapagos to 160E building to -15 cms at 130W and -10 cms solid from Ecuador to 150W. Negative anomalies were -5 to -10 cms along the coast of Peru up into Ecuador and then reaching north up to Baja and into South and North CA. Looking at the big picture, negative anomalies were forming a massive triangle from San Francisco south to Southern Chile and west out to the intersection of the dateline and the equator. No positive anomalies were over the equatorial Pacific, except from the dateline and points west of there.
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.
Hi-res Nino1.2 & 3.4: (11/18) The latest images indicate cold anomalies were on the equator from Ecuador west to the dateline and solid in density over that entire and large area. Colder anomalies were imbedded in that flow between 110W to 150W and steady in coverage today. Cool anomalies were also holding along the coasts of Chile and Peru through a small pocket of warming anomalies were indicated along southern Peru. This clearly indicates a well developed version of La Nina filling the entire equatorial Pacific and down into Chile. Warm water was all but gone off Central America north of the equator. Overall the cool pool on the equator was unmistakable and starting to show signs of rebuilding after previously being stalled.
Hi-res 7 day Trend (11/18): Temps were cooling in pockets on the equator between Ecuador to 145W and steady west of there.
Hi-res Overview: (11/18) A stream of consistent cool water is well entrenched from Chile up to Peru and Ecuador then tracking west on the equator out to the dateline and west to New Guinea with markedly cool anomalies between 110-150W. A clear La Nina signal is depicted.
Nino1.2 Daily CDAS Index Temps: (11/19) Today's temps were falling slightly to -0.930 after rising to a recent high of -0.650 on 11/15. This area has been on a seesaw rising trend since early October. Temps were previously down to -2.138 on 8/13. The longterm trend has been steady but quite cold since June.
Nino 3.4 Daily CDAS Index Temps: (11/19) Temps were falling slight today at -1.195 today after bottoming out at -1.654 on 11/3, beating the previous low of -0.945 on 9/22. The previous low before that was -0.733 on 9/10. Temps have been on a steady decline since 7/25. Overall the trend appears to be in a steep decline.
CFSV2 Forecast for Nino3.4 Sea Surface Temp (SST) Anomalies & Current SST Anomalies
SST Anomaly Projections
CFSv2 Uncorrected Data (11/19) Today the model indicates temps at -1.45 degs. The forecast depicts a steady downward trend to continue reaching -2.00 degs in mid-Jan then beginning to rise, rebuilding up to -0.30 degs in early Aug and stabilizing there. This is becoming a 2 year event in that even after temps return to 0/normal it will take 3-5 months for the upper level circulation to respond in kind.
IRI Consensus Plume: The Oct 21, 2020 Plume depicts temps are at -1.10 degs today, and are to hold into Dec, then moderating and starting to rise some to -0.89 by Jan 2021 and then neutral by June. Most models are suggesting a moderate to La Nina returning to Neutral in the late Spring. 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 - this is a lagging indicator) (11/19): The daily index was rising at +20.17. The 30 day average was rising at +6.99. The 90 day average was falling some at 8.14, suggesting the current fading Active MJO has had some limited impact on the deep state La Nina pattern. This index is a lagging indicator.
ESPI Index (like SOI but based on satellite confirmed precipitation. Positive and/or rising is good, negative and/or falling is bad): June -0.67, May -0.46, April 2020 -0.69, March -0.09, Feb +0.65, Jan +0.42, This index was steady positive Aug 2018 through Feb 2020, and now is steady negative, but only weakly so.
Pacific Decadal Oscillation
Per NOAAs index recent values: 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 2019 -0.18, Feb -0.50 Mar -0.23, April +0.10, May +0.14, June -0.11, July +0.44, Aug -0.14, Sept +0.05, Oct -0.96, Nov -0.28, Dec +0.01, Jan 2020 -1.17, This continues to look like the warm phase of the PDO. No consistently solid negative readings have occurred since Feb 2014
The Washington/JISAO index (Jan-Dec): Jan 2018 +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
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Surf Height-Swell Height Correlation Table