3 replies to this topic

[griteater]

How are winters classified in terms of ENSO strength? Below are a few examples. In these examples, I'm using the following scale: +0.5 to +0.9 SST Anomaly for weak El Nino, +1.0 to +1.4 for moderate El Nino, and +1.5 & above for strong El Nino. Also, I'm using the latest ONI from the CPC.

1. Winter 1951-1952...the El Nino peaked in Sept/Oct/Nov at +1.2, then fell to +0.6 in DJF and +0.4 in JFM. Does this winter get categorized as moderate because it peaked at +1.2, or is it considered weak since the value fell down into the weak range during the winter months?

2. Winter 1987-1988...the El Nino peaked in Aug/Sept/Oct at +1.6, then fell to +0.7 in DJF and +0.5 in JFM. Similarly, does this winter get categorized as strong because it peaked at +1.6 in ASO, weak due to the winter month readings, or some combination of both?


A second question would be regarding the scale used for the strength classification. Above, I've used a 0.5 scale for weak/moderate/strong. I've seen others consider +1.2 as the low threshold for a moderate El Nino. In that case, what is considered the low threshold for a strong El Nino....and which scale is more widely used?

[QVectorman]

http://ggweather.com/enso/oni.htm Jan has them all categorized with an explanation

[griteater]

http://ggweather.com/enso/oni.htm Jan has them all categorized with an explanation

I like the approach taken with the ENSO classifications on that site. Thanks.

[aljareer]

Climatic phenomena in the Mathematical Sciences is divided into two sections:
1- Statistic. example : el nino/la nina ...
2- Dynamic. example : mjo . Arctic vortex ....

we must expand the circle of monitoring the climate.


Misconceptions about El Nino :

http://www.climatewa...blame-el-nino/2


thanks.