Climate Outlook – 2011/2012

Nadraki Weatherwww.nadraki.cominfo@nadraki.com

El Nino / Southern Oscillation

Normal conditions

Southern Oscillation Index (SOI)

SOI is the standardised anomaly of the Mean Sea Level Pressure difference between Tahiti and Darwin. It is calculated as follows:

[ Pdiff - Pdiffav ] SOI = 10 -------------------

SD(Pdiff) where Pdiff   =   (average Tahiti MSLP for the month) - (average Darwin MSLP for the month),Pdiffav   =   long term average of Pdiff for the month in question, andSD(Pdiff)   =   long term standard deviation of Pdiff for the month in question.

 

South Pacific Convergence Zone

Neutral

El Nino

La Nina

References

NIWA Island Climate Update 132 - September 2011

Http://www.niwa.co.nz/node/102804

ENSO Observations www.bom.gov.au/climate/enso/

Fiji Climate Outlook http://www.met.gov.fj/aifs_prods/Outlook.

pdf

Climate is what you expect, weather is what

you get Day to day weather is highly variable in

the Pacific.

Large ocean areas and small landmass means minor movements of weather systems can have significant impacts.

It only takes one cyclone to ruin your day!