Wednesday, February 6, 2019
- Buoy 233 (Pearl Harbor Entrance)/ Buoy 239 (Lanai): At Barbers Point (238) seas were 1.6 ft @ 14.3 secs with swell 0.9 ft @ 7.7 secs from 204 degrees.
- Buoy 106 (Waimea): Seas were 18.3 ft @ 12.5 secs with swell 11.8 ft @ 11.8 secs from 334 degrees and 8.2 ft @ 15.2 secs from 340 degrees.
- Buoy 46025 (Catalina RDG): Seas were 3.9 ft @ 15.9 secs with swell 2.0 ft @ 16.4 secs from 269 degrees. Wind at the buoy was west at 2 kts. Water temperature 58.1 degs. At Ventura (Buoy 111) swell was 2.5 ft @ 8.0 secs from 277 degrees.
At Santa Monica (028) swell was 2.1 ft @ 17.1 secs from 257 degrees. At
Oceanside (045) swell was 1.2 ft @ 17.8 secs from 243 degrees.
Southward at Pt Loma (191) swell was 2.7 ft @ 17.5 secs from 271
- Buoy 46012 (Half Moon Bay)/029 (Pt Reyes): Seas were 9.1 ft @ 16.7 secs with swell 6.4 ft @ 16.1 secs from 292 degrees. Wind at the buoy (013) was northeast at 10-16 kts. Water temp 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.
Monday (2/11) in North and Central CA dateline swell was producing
waves in the 2 ft overhead range and clean but with some intermixed
lump. Protected breaks were chest to head high and clean and lined up.
At Santa Cruz surf was chest to head high on the sets and soft and
lumpy but clean. In Southern California/Ventura surf was waist to maybe
chest high and clean and line dup and reasonably rideable. In North
Orange Co surf was chest high or a liittel more on the biggest sets and
clean and lined up but soft and inconsistent. South Orange Country's
best summertime breaks were waist high on the sets and clean but weak.
North San Diego surf was waist high and clean and lined up with calm
wind. Hawaii's North Shore was about 8 ft Hawaiian with amybe some 10
ft sets and a tattererd onshore north wind mess. The South Shore was
waist to chest high and lined up and reasonably clean. The East Shore
was getting north local swell with waves double overhead and a chopped
mess with north winds 10 kts or greater.
See QuikCASTs for the 5 day surf overview or read below for the detailed view.
On Monday (2/11) swell was fading in Hawaii associated with a local
gale that developed just north of the Islands. Swell was fading in
California from a fairly strong system that developed off the Kuril
Islands tracking east Tues-Wed (2/6) with seas 44 ft aimed east, then
fading on the dateline on Thurs (2/7). A small system developed just
south of the North Dateline region Sun-Mon (2/11) with 47 ft seas aimed
northeast likely having little swell producing effect. Another system
is to develop off Kuril Islands lifting northeast Wed-Thurs (2/14)
again producing 47 ft seas ained east, and this one having better odds
of producing swell. A weaker system is to follow Sun-Mon (2/18)
producing producingn32 ft seas reaching into the Northwestern Gulf.
Theoretically the Active Phase of the MJO is to build very strong in
the West Pacific and pushing east into the East Pacific over the next
3-4 weeks feeding the storm track. Prepare for possible interesting
local weather impacts in Hawaii and California.
See all the details below...
SHORT- TERM FORECAST
Current marine weather and wave analysis plus forecast conditions for the next 72 hours
Monday AM (2/11) the jetstream was consolidated tracking off Japan with
winds 175 kts producing a small trough over the Kuril Islands offering
support for gale development there. But east of there the jet split
just before reaching the dateline with the northern branch tracking
northeast up over the Central Aleutians tracking into Alaska and then
pushing south through the Eastern Gulf of Alaska before turning east
and tracking weakly into Central Oregon setting up a weak trough off
the Pacific Northwest Coast offering opportunity for weather production
there. The southern branch tracked east over Hawaii and then lifting
gnetly northeast tracking inland over North Baja. This is effectively
no differnt than things have been for the past week. Over the next 72
hours more of the same is forecast with winds still 175 kts streaming
off Japan reaching almost to the dateline on Wed (2/13) with the trough
over the Kurils easing east some and the trough in the Eastern Gulf
pushing inland over Oregon at that time. The trough in the far West
Pacific is to ease east some into Thurs (2/14) continuing to support
gale development there. And a new small trough is also forecast to
start building off British Columbia offering more weather potential fro
the US West Coast. Beyond 72 hours the East Gulf trough is to build
some while falling southeast pushing into Northern California on Sat
(2/16) with winds 175 kts pushing over the Sierra. Back to the west the
jet is to remain split but with the split point just east of the
dateline and winds weaker at 140 kts streaming off Japan running flat
east to the split point, but the split not as pronounced as weeks past.
There is still to be limited support for gale development west of the
dateline. But by Mon (2/18) energy levels to continue to fall in the
jet with the saem general configuration holding. One would think the
Active Phase of the MJO in the West Pacific might positively influence
the jetstream. But at the same time, the underpinnings of what was to
be El Nino are fading in the East Pacific possibly causing this long
running split pattern in the East. Long term the models suggest the jet
is to continue to slowly weaken.
Monday (2/11) swell from a larger and more organized storm that pushed
east towards Hawaii and the US West Coast was fading in California (see
West Pacific Storm below). Swell from a raw local gale was fading in
Hawaii (see Local Hawaiian Gale below).
the next 72 hours another gale is forecast developing in the far West
Pacific off Japan on Tues PM (2/12) with 45 kt west winds and seas
building from 30 ft at 41N 158E aimed east. On Wed AM (2/13) winds to
build to 65 kts from the west with seas to 46 ft at 44.5N 163E. In the
evening winds are to be fading from 50 kts with the storm lifting
northeast with seas to 48 ft at 48N 169E aimed east (or just off the
North Kuril Islands). On Thurs AM (2/14) winds to be fading from 45 kts
from the southwest targeting the Aleutians with seas 43 ft at 50.5N
171E alos aimed northeast. This system is to ove into the Bering Sea
and fade after that. Possible swell to radiate towards Hawaii and the
US West Coast.
West Pacific Storm
A stronger and more organized storm started forming just off the Kuril
Islands Mon PM (2/4) with 50 kt west winds and seas building from 41 ft
at 45N 158.5E aimed east. On Tues AM (2/5) the storm was downgraded to
gale status tracking east with 45 kt west winds and seas to 44 ft at
45N 165.5E aimed east. In the evening the gale tracked east with 45 kt
northwest winds and seas 39 ft over a solid area aimed east at 43N
169E. On Wed AM (2/6) fetch was lifting north towards the North
Dateline region with 45 kt west winds over a small area just south of
the Aleutians with 41 ft seas at 45N 172E aimed east. Fetch to be
fading over the North Dateline region in the evening from 30-35 kts
from the northwest with seas fading from 34 ft at 43.5N 178E aimed
east. The gale is to dissipate from there.
Swell fading Mon (2/11) from 6.0 ft @ 16 secs (9.5 ft) and possibly
being overridden by local windswell. Swell Direction: 296 degrees
Local Hawaiian Gale
A cutoff gale developed on Sat AM (2/9) 700 nmiles north of
Hawaii producing 45 kt north winds with seas building from 26 ft at 35N
156N aimed south. In the evening north winds were falling south at
50 kts with seas building to 30 ft at 34N 160W aimed south. On Sun
AM (2/10) fetch was fading from 45 kts from the northeast and just 300
nmiles northwest of Hawaii with 37 ft at 26N from 161W aimed
south. In the evening fetch was fading from 30-35 kts just north of the
Islands with 30 ft seas at 23N 160W and 26 ft seas impacting Hawaii directly. Large
raw protoswell is forecast for Hawaii.
Hawaii: Swell fading Mon (2/11) from 11.9 ft @ 13 secs (15 ft). Swell
Direction: 340 degrees
Local West Coast Gale
On Wed PM (2/13) a local gale is to
start developing in the Northern Gulf fallign southeast with 55
kt northwest winds and seas 37 ft at 52N 145W aimed southeast. On
Thurs AM (2/14) the storm is to be faloing southeast with 55 kt
northwest winds and seas 39 ft at 50N 139W and mostly out of the CA
swell window. In the evening winds to be fading from 40 kts from the
northwest with seas fading from 37 ft at 48.5N 133.5W and out of the CA
swell window targeting Oregon well. The gale is to be fading just off
Oregon Fri AM (2/15). Something to monitor.
North Pacific Animations: Jetstream - Surface Pressure/Wind - Sea Height - Surf Height
No tropical weather systems of interest are forecast.
California Nearshore Forecast
Monday (2/11) high pressure was inland over Nevada and just off the
Central Coast with north winds 5 kts for the entire state other than
south winds 20 kts for Cape Mendocino associated with a building front
and low pressure off the coast of the Pacific Northwest. Light rain
forecast for the northern half of North CA through the day. Tues (2/12)
another local low is to start building off the OR-CA border and a
second one off Central CA lifting north with south winds 5 kts for
Central CA early and building to 15 kts later and up to 20+ kts ofr
North CA late afternoon. Light rain building down to Pt Arena late
afternoon. Wednesday AM (2/13) south winds are forecast at 35 kts from
Monterey Bay northward early and 25 kts from Pt Conception northward
building to 35 kts late afternoon. The core of the low is to be over
Cape Mendocino late afternoon. Heavy rain for North CA early and light
rain to Pt Conception early. Moderate to heavy rain building south into
San Diego late evening. Heavy snow for the Sierrastarting at sunset and
holding through the evening. Thurs AM (2/14) high pressure and north
winds are to be 25 kts for North CA early and 15+ kts for Central CA
and 15 kts for Southern CA fading to 5-10 kts later all locations from
the northwest. Light rain early fading to dry later in the day. Snow
fading early for the Sierra. Friday (2/15) northwest winds are forecast
at 5 kts early for all of North and Central CA building to 15 kts later
in the day. Light rain for North CA from Pt Arena northward. Modest
snow for the Sierra overnight. Sat AM (2/16) north winds 15+ kts for
all off North and Central CA and even into most of Southern CA early
holding for North and Central CA through the day but slackening for
Southern CA. Light rain for Cape Mendocino through the day. Snow fading
for the Sierra early. Sunday (2/17) high pressure takes control with
north winds 25+ kts all day for the entire state early and generally
holding all day. Monday (2/18) light northeast winds for Southern and
Central CA early but north 20 kts for North CA down to Pt Arena early
turning northwest all locations late afternoon. No precip forecast.
Total snow accumulation for for the week for Lake Tahoe (thru 2/13): 42 inches and 32 inches for Mammoth.
Snow Models: http://www.stormsurf.com/mdls/menu_snow.html (Scroll down for resort specific forecasts).
No swell of interest was in the water.
Over the next 72 hours no swell producing weather systems of interest are forecast.
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 no obvious swell producing weather systems are forecast.
Beyond 72 hours no swell producing weather systems of interest are forecast.
Active MJO Building - Strong WWB Forecast
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.
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).
La Nina started developing in early 2016, but westward displaced and
generally weak. And by March 2017, it was gone with suspicious warming
developing along South America and over the Galapagos to a point south
of Hawaii. By May the atmosphere returned to a neutral configuration
but then in July east anomalies started building in the KWGA and have
not stopped, with cold water upwelling over the the Nino1.2 and 3.4
areas, indicative of La Nina. A double dip La Nina was in control and
continued 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. As of January
2019, those warm waters were fading.
LONG-RANGE PACIFIC STORM AND SWELL GENERATION POTENTIAL FORECAST
Fall/Winter 2018 = 6.0 (California & Hawaii)
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)
Assuming the PDO has moved to the warm phase and that El Nino does not
develop as strong as previously forecast, and assuming and an
ocean-atmospheric coupling becomes weakly established in the January
timeframe and ocean temperature anomalies in Nino3.4 build to the +0.6
deg range, there is good probability for slightly enhanced storm
production in the North Pacific starting in the late Nov timeframe
(specifically the Gulf of Alaska and Dateline regions) with slightly
increased intensity in number of storm days and storm intensity,
resulting in slightly increased odds for larger than normal swell, with
increased duration and higher than normal period. This should be
significantly better than the past 2 winter seasons.
KWGA/Equatorial Surface Wind Analysis & Short-term Forecast:
Analysis (TAO Buoys): As of (2/11)
5 day average winds were from the east over the Eastern equatorial
Pacific to the middlie of the KWGA, then weaker from there westward.
Anomalies were generally neutral over the East equatorial Pacific and
over the entirety of the KWGA.
1 Week Forecast (GFS Model): On
(2/11) weak west anomalies were over the dateline and Central KWGA. The
forecast is for a very strong Westerly Wind Burst (WWB) to start
building on 2/13 over the dateline and Central KWGA and continuing
nonstop through the end of the model run on 2/18. Support for storm
development is to start building focused west of the dateline.
Kelvin Wave Generation Area wind monitoring model: West and East
Longer Range MJO/WWB Projections:
(2/10) The Active Phase of the MJO was moderate and filling the KWGA.
The statistic model indicates the Active Phase is to hold at moderate
strength in the KWGA while slowly easing east through day 10, then
weakening and moving just east of the KWGA at day 15. The dynamic
model indicates the same thing but with the Active Phase building some
centered on the dateline and firmly in control at strong strength at
Phase Diagrams 2 week forecast (ECMF and GEFS):
(2/6) No fresh data available - The ECMF model depicts the Active Phase
of the MJO was moderate over the West Pacific. It is to fade in
strength and track east over the eastern Atlantic at day 15. The GEFS
model suggests the Active Phase is in the West Pacific and is to weaken
over the next 4 days then retrograding and rebuilding in the West
Pacific through day 8 then moving east to the Atlantic days 9-15.
40 day Upper Level Model: (2/11)
This model depicts a strong Active Phase over the dateline slowly
weakening while pushing east moving into and over Central America on
3/3. A moderate Inactive signal is to set up in the West Pacific on
2/21 moving to the East Pacific and Central America on 3/18. A weak
Active Phase of the MJO is to be setting up in the West Pacific on 3/13
pushing east to the dateline at the end of the model run on 3/23.
4 Week CFS Model (850 mb wind):
(2/10) This model depicts moderate strength west anomalies were
building over the KWGA focused mainly on the dateline. West anomalies
are to build to strong status over the next 3-5 days and hold on the
dateline as a strong Active Phase builds there through 3/3 with a
strong Westerly Wind Burst in effect on the dateline easing east into
the California coast starting 2/24 through 3/3. Moserate west
anomalies to hold through the end of the model run on the dateline on
3 Month CFS Model (850 mb wind): (2/11)
This model depicts a weak version of the Active Phase was over the KWGA
with modest west anomalies in the KWGA. This pattern is to hold while
easing east through 3/7 but with west anomalies building strongly
2/12-2/27 and at solid Westerly Wind Burst status. This is an exciting
development. On 2/19 a modest Inactive MJO signal is to start
developing in the far West Pacific and id to be filling east into the
KWGA 2/25 through 4/3 but with steady west anomalies continuing mainly
on the dateline. On 3/30 a strong Active Phase of the MJO is to start
building in the KWGA with west anomalies building and in control
through the end of the model run on 5/11. The low pass filter indicates
a low pressure bias is fully in control of the KWGA centered on the
dateline reaching east over California and forecast holding over
California through 4/15, then retracting to the coast. A third contour
line faded 12/17 but then rebuilt 2/10 and is to rebuild to 4 contour
lines 3/7 and holding through the end of the model run. This is a
positive new development. It appears from this model that a tendency
towards El Nino was previously in control, then it faded, and is now to
rebuild and strongly so. Theoretically the atmosphere and ocean were at
one time trying to become coupled towards El Nino in the Pacific Ocean,
but there's no objective evidence that it every happened. Still this
pattern is more favorable to support storm production in the Pacific
regardless of whether El Nino develops, because the atmosphere is still
turning from a La Nina pattern (that has been entrenched for the past 2
years) at a minimum towards a neutral one. Our assumption is a normal
Winter pattern will result, or perhaps slightly enhanced, but nothing
more. But of more interest, if the low pass filter forecast holds,
maybe El Nino to develop next year.
CFSv2 3 month forecast for 850 mb winds, MJO, Rossby etc - Alternate link
Subsurface Waters Temps
(2/11) Today in the far West Pacific water temps are no longer 30 degs,
but only 29 degrees reaching east to 174W. The 28 deg isotherm line had
retrograded west to 160W mid-Nov, then moved east and walled up to
153W, but retrograded and is back at 162W today. The 24 deg isotherm
was pushing into Ecuador 25 meters down. Anomaly wise, warm anomalies
are filling the entire subsurface Pacific at +1 degs or greater with a
pocket of warm water building under the dateline at +3 degs (Kelvin
Wave #3). The remnants of Kevin Wave #2 have fully erupted in the far
East Pacific with temps there only +1-+2 degs. We think the peak of the
Kelvin Wave cycle for this supposed El Nino has already occurred
associated mainly with Kelvin Wave #2. But Kelvin Wave #3 might add
some warmth moving into 2019. And a new Westerly Wind Burst is forecast
starting a week out. So there's good surface oceanic warming potential
to feed jetstream core energy for the foreseeable future. The hi-res
GODAS animation posted 2/7 indicates Kelvin Wave #2 fading in the East
Pacific with pockets of 3 degs from 130W into Ecuador and with +4 deg
anomalies building in the west from New Guinea to the dateline (Kelvin
Wave #3 attributable to a Westerly Wind Burst occurring there
12/30-1/16). +1-2 degs anomalies connect the 2 Kelvin Waves making a
river of warm water traversing the width of the equatorial Pacific. The
GODAS animation appears to be 1 week behind the TAO data but also is
more detailed and accurately modeled.
Sea Level Anomalies:
(2/7) Positive anomalies were gone from the interior Maritime Continent
but were solid tracking east from 150E over the dateline to a point
west of the Galapagos (110W) at mostly 0-5 cms but with a solid pocket
of +5 cms anomalies from 160E over the dateline to 130W. -5 cms
anomalies were in a small pocket at 90W associated with the upwelling
phase of the Kelvin Wave Cycle. A new weak Kelvin Wave is building
north of New Guinea while a previous warm subsurface pattern is fading
over the east equatorial Pacific.
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: (1/31) No update available - The latest images (1.2 3.4)
indicate temps were very weakly warm straddling 5 degrees north and
south of the equator from the dateline west to the Galapagos and still
losing warmth compared to days and weeks past. Warm water was building
strongly along the coast of Chile and Peru up into Ecuador and Central
America. There is no indications that an El Nino is building and it
appears a warm pulse previously underway in the East Pacific was
continuing to fade today. A concerning pocket of cool waters elongated
east to west off Peru to 130W is fading some. Overall the pattern looks
very weakly like El Nino, but nothing more. In all this warming pattern
is weak and becoming more fragile by the day.
Hi-res 7 day Trend (2/10):
A building solid area of warm water remained off Chile and Peru
building north to Ecuador and extending west to 125W. It looks like the
far equatorial East Pacific is warming some.
(2/10) Modest warm water was along the immediate coast of Chile and
Peru reaching up to the equator from Ecuador over the Galapagos
continuing out to 120W then weaker to the dateline. We have turned the
corner from a cool regime a year ago to a warm regime now. And one
could maybe think we are moving towards an El Nino pattern just looking
at the surface temps. But that would be a false conclusion because the
warm signal on the surface should be much stronger at this time of the
year if El Nino were truly developing. We are in an ENSO neutral
pattern biased warm and likely not every moving to an official minimal
El Nino status this winter.
Nino1.2 Daily CDAS Index Temps:
(2/11) Today's temps were falling steadily at +0.114 degrees after
having risen to +1.15 on 2/3, falling to -0.15 degs on 1/28. Temps rose
to a peak +1.385 on 1/21. Previously they were down to -0.44 on 12/25,
and that after having risen to +1.265 on 12/20. Previously temps fell
to +0.212 on 12/3, after having previously built to +1.534 on 11/27.
That peak on 11/27 was the all time high for this event in this region.
Nino 3.4 Daily CDAS Index Temps: (2/11)
Today temps were falling at +0.093 after rising to a peak at +0.738 on
1/21, after being at +0.487 on 1/7 and after previously risen to +1.050
degs on 12/6 and previously in the +0.5-+0.6 range since 11/12. The all
time high for this event was +1.45 on 11/5, beating the previous peak
temps of +0.795 on 10/9, and +0.649 on 9/27, and that beating the
previous peak at +0.490 on 7/2.
CFSV2 Forecast for Nino3.4 SST Anomalies
SST Anomaly Projections
CFSv2 Uncorrected Data
(2/11) The model indicates temps were at +0.75 degs on Jan 1 and are
forecast building to +1.15 on March 1 and stable into June. After that
temp are to fall to +0.6 degs in Sept
holding till Oct 1. If one is to believe the model then one would
assume that El Nino is to build in the Winter of 18/19 and then falling
to minimal El Nino status in Winter of 2019/20. But given all the data
we've seen, we believe there no odds of El Nino developing this year.
But maybe a multiyear warming event is in progress as suggested by this
IRI Consensus Plume:
The mid-Nov Plume depicts temps are to slowly rise from here, to +1.00
degs in November and +1.0-+1.1 degs through Feb 2019, then slowly
fading to 0.71 in July. See chart here - link. There's a 90% chance of a weak El Nino developing through January.
Atmospheric Coupling (Indicating the presence of El Nino in the atmosphere driven by the ocean):
Southern Oscillation Index (SOI) (negative is good, positive bad) (2/11):
The daily index was falling today at -19.02. The 30 day average was
falling some at -0.59 suggesting a neutral MJO. The 90 day average was
falling some at +1.89, rising through Jan1 to +4.67 then fading some
after that but not much. There is no indication that El Nino is present
in the atmosphere.
(like SOI but based on satellite confirmed precipitation. Positive
and/or rising is good, negative and/or falling is bad): (2/6) The index
rose to +0.30 on 1/20, but has been falling recently at -0.13 today, up
from -0.24 in late December, down from +0.28 on 12/15 and not anywhere
near as strongly positive as it should be if El Nino were developing.
It suggest only ENSO neutral conditions.
Pacific Decadal Oscillation: The PDO is weakly positive, even though La Nina is in play.
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 -0.42, Sept -0.42.
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
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
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Surf Height-Swell Height Correlation Table