ENSO Updates (2007 thru 2023)

[NDG]

This is one big bust by the Euro, it forecasted a much drier May for central America and wetter for the immediate equatorial pacific.

[Kingarabian]

This is one big bust by the Euro, it forecasted a much drier May for central America and wetter for the immediate equatorial pacific.

https://i.imgur.com/YMFulpv.png
https://i.imgur.com/bi2obd3.gif

Sort of similar to last year. I wonder if the CAG we saw this year and last year hurt the forecast.Though pretty good job over the Caribbean/MDR.

[NotSparta]

GFS in better agreement with the CFS that sinking air will be developing close to the MC and rising air returning moving across the Pacific:
https://i.imgur.com/QWZCoiq.png

Maybe, but not quite as intense as the CFS w/ its tendencies to lean too far towards El Niño

[NotSparta]

So based on the 12z Euro, the SOI for the first 10 days of June will likely average out between -3 and -7, this is because of nearly identical high pressure numbers over Tahiti and Darwin. I'm saying between -3 and -7 due to identical pressures in the same region so it will come down to day by day observations. Days 10 through 20 of June will likely be a positive SOI due to the MJO entering the MC.

To update this post: Based on today's 12Z Euro, the next 4-5 days SHOULD be positive contributions to the SOI. After June 12, the model is showing a negative drop in the SOI once again because it builds back high pressure over Darwin. If it continues to show this solution (and verifies), there's a good possibility that a WWB sets up through the first week of July because through days 5-10 of the forecast, there's a growing amount of -VP200 anomalies building over the dateline. First 10 days of June will likely be near-5. But yeah I would've expected the SOI to be much more positive considering the strong pulse over the IO.

SOI continues to not cooperate and the Euro pressure forecasts continue to bust. I still believe it'll flip positive for a couple of days but we'll see.

Looking at the GFS 850mb wind Hovmoller, it's been about 8 days since the trade burst kicked off though there's yet to be a solid reflection on the buoys:
https://i.imgur.com/jzizAC6.png
Probably why anomalies continue to hold firm.

It did take like 3 weeks for any WWB effects to show up last time around, so it's not surprising. In addition it's only been 8 days in tiny spots. In most areas, the EWB's been around for at most 5 days

[Kingarabian]

To update this post: Based on today's 12Z Euro, the next 4-5 days SHOULD be positive contributions to the SOI. After June 12, the model is showing a negative drop in the SOI once again because it builds back high pressure over Darwin. If it continues to show this solution (and verifies), there's a good possibility that a WWB sets up through the first week of July because through days 5-10 of the forecast, there's a growing amount of -VP200 anomalies building over the dateline. First 10 days of June will likely be near-5. But yeah I would've expected the SOI to be much more positive considering the strong pulse over the IO.

SOI continues to not cooperate and the Euro pressure forecasts continue to bust. I still believe it'll flip positive for a couple of days but we'll see.

Looking at the GFS 850mb wind Hovmoller, it's been about 8 days since the trade burst kicked off though there's yet to be a solid reflection on the buoys:
https://i.imgur.com/jzizAC6.png
Probably why anomalies continue to hold firm.

It did take like 3 weeks for any WWB effects to show up last time around, so it's not surprising. In addition it's only been 8 days in tiny spots. In most areas, the EWB's been around for at most 5 days

Effects yes, I'm talking about observed strong trades. Last WWB and EWB 5 days in and strong anomalies were present.

[Kingarabian]

Looking at today's RMM plots:
Strong possibility that the length and strength of this trade burst in the long range is likely overdone by the GFS as it's showing too much amplification over the MC once again.

While not to the full extent, the GFS and Euro are trending towards the CFS's solution which is to keep the MJO alive with continued progression towards the WPAC. This continues the pattern we've been in since the spring. Looks likely a WWB will be on the way to close out the month and into July. Considering that the upwelling Kelvin wave continues to sit deep in the WPAC without much progression due to relaxed trades over the dateline, there is good reason to believe that the next WWB will mean a high chance El Nino lasts through the rest of the year.

[Ntxw]

SOI continues to not cooperate and the Euro pressure forecasts continue to bust. I still believe it'll flip positive for a couple of days but we'll see.

Looking at the GFS 850mb wind Hovmoller, it's been about 8 days since the trade burst kicked off though there's yet to be a solid reflection on the buoys:
https://i.imgur.com/jzizAC6.png
Probably why anomalies continue to hold firm.

It did take like 3 weeks for any WWB effects to show up last time around, so it's not surprising. In addition it's only been 8 days in tiny spots. In most areas, the EWB's been around for at most 5 days

Effects yes, I'm talking about observed strong trades. Last WWB and EWB 5 days in and strong anomalies were present.

The EWB would have done more damage had the El Nino died out in the Spring, but it didn't. This EWB likely stalled it more than anything until the next WWB. That's why there is seasonal variability, timing with it.

[NotSparta]

Looking at today's RMM plots:
Strong possibility that the length and strength of this trade burst in the long range is likely overdone by the GFS as it's showing too much amplification over the MC once again.

While not to the full extent, the GFS and Euro are trending towards the CFS's solution which is to keep the MJO alive with continued progression towards the WPAC. This continues the pattern we've been in since the spring. Looks likely a WWB will be on the way to close out the month and into July. Considering that the upwelling Kelvin wave continues to sit deep in the WPAC without much progression due to relaxed trades over the dateline, there is good reason to believe that the next WWB will mean a high chance El Nino lasts through the rest of the year.

Relaxed trades over the dateline? What's showing that?

[Kingarabian]

Looking at today's RMM plots:
Strong possibility that the length and strength of this trade burst in the long range is likely overdone by the GFS as it's showing too much amplification over the MC once again.

While not to the full extent, the GFS and Euro are trending towards the CFS's solution which is to keep the MJO alive with continued progression towards the WPAC. This continues the pattern we've been in since the spring. Looks likely a WWB will be on the way to close out the month and into July. Considering that the upwelling Kelvin wave continues to sit deep in the WPAC without much progression due to relaxed trades over the dateline, there is good reason to believe that the next WWB will mean a high chance El Nino lasts through the rest of the year.

Relaxed trades over the dateline? What's showing that?

Buoys. Hence why the downwelling Kelvin wave continues to garner more amplitude and there's some +3C anomalies popping up.

[CyclonicFury]

Looking at today's RMM plots:
Strong possibility that the length and strength of this trade burst in the long range is likely overdone by the GFS as it's showing too much amplification over the MC once again.

While not to the full extent, the GFS and Euro are trending towards the CFS's solution which is to keep the MJO alive with continued progression towards the WPAC. This continues the pattern we've been in since the spring. Looks likely a WWB will be on the way to close out the month and into July. Considering that the upwelling Kelvin wave continues to sit deep in the WPAC without much progression due to relaxed trades over the dateline, there is good reason to believe that the next WWB will mean a high chance El Nino lasts through the rest of the year.

Relaxed trades over the dateline? What's showing that?

Buoys. Hence why the downwelling Kelvin wave continues to garner more amplitude and there's some +3C anomalies popping up.

The buoys don't appear to show "relaxed" trades, it's more about average-slightly above average trades. Ventrice's Hovmoller shows a sizable trade burst ongoing.

[Kingarabian]

Relaxed trades over the dateline? What's showing that?

Buoys. Hence why the downwelling Kelvin wave continues to garner more amplitude and there's some +3C anomalies popping up.

The buoys don't appear to show "relaxed" trades, it's more about average-slightly above average trades. Ventrice's Hovmoller shows a sizable trade burst ongoing.

Those Hovmollers are based on the GFS's analysis. On the buoys between 180 and 145 there are very little hints of 5-6Ms anomalous trades that the GFS Hovmoller has been showing since June 1.


Here's the 2017 May EWB comparison that killed any chance of El Nino:

[Ntxw]

Going to be 0.9C this week.

[cycloneye]

 https://twitter.com/MJVentrice/status/1138068641256235009




 https://twitter.com/MJVentrice/status/1138068960233103360

[cycloneye]

Going to be 0.9C this week.

Text.

https://www.cpc.ncep.noaa.gov/products/ ... ts-web.pdf

[Kingarabian]

https://twitter.com/MJVentrice/status/1 ... 1256235009
https://twitter.com/MJVentrice/status/1 ... 0233103360

As usual with Ventrices tweets:
 https://twitter.com/MJVentrice/status/1138069577777274880




And also we can see pretty relaxed trades or early signs of a WWB around June 20. Interestingly this is what the CFS has been showing for weeks in regards to that trade surge over the EPAC. Starting today differences in MJO forecasts will begin so we'll see which model is right.

[CyclonicFury]

Daily SOI up to +8.15. First positive daily value I've seen in a while.

[Kingarabian]

Daily SOI up to +8.15. First positive daily value I've seen in a while.

Should be positive for the next few days if the observed pressures match the Euro forecast.

[Kingarabian]

Can't underestimate the power of Equatorial Rossby Waves.
You can see how an ERW in association with the conducive MJO phase looks to be triggering a strong WWB over the WPAC/DL/CPAC and another ERW in association with the suppressed MJO phase is triggering a strong trade burst (strongest we've seen in a while) over the EPAC.

[Monsoonjr99]

Can't underestimate the power of Equatorial Rossby Waves.
You can see how an ERW in association with the conducive MJO phase looks to be triggering a strong WWB over the WPAC/DL/CPAC and another ERW in association with the suppressed MJO phase is triggering a strong trade burst (strongest we've seen in a while) over the EPAC.

-snip-

Possibly a Modoki on the way?

[Kingarabian]

Can't underestimate the power of Equatorial Rossby Waves.
You can see how an ERW in association with the conducive MJO phase looks to be triggering a strong WWB over the WPAC/DL/CPAC and another ERW in association with the suppressed MJO phase is triggering a strong trade burst (strongest we've seen in a while) over the EPAC.

-snip-

Possibly a Modoki on the way?

That was my thinking in late May:

GFS now takes the MJO into phase 2, similar to the Euro. Has a sizeable trade surge that extends to the dateline but keeps trades weak and relaxed over the EPAC for the forecast period:
[url]https://i.imgur.com/FniTWBW.png[url]

CFS also takes the MJO into phase 2, similar to the Euro. Doesn't show much of an easterly component in its forecasts, keeps trades or westerlies blowing over the dateline, but has a strong trade burst over the EPAC:
[url]https://i.imgur.com/UplNhlo.png[url]

So if the GFS solution materializes, a weak traditional El Nino will likely persist due to the trades blowing over an area that has sufficient warmth while weaker trades don't encourage much cooling over the EPAC.
If the CFS solution materializes the weak traditional El Nino signature over the Pacific ocean will surely disappear and a Modoki-esque signature will take over.

Looks like a blend of the above two solutions is what will happen based on models and present observations.