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RAINFALL OUTLOOK FOR TONGA 
FOR   
Dec09 - Feb 2010 
 
El Niño conditions exist in the equatorial Pacific. Many 
dynamical climate models project the continuation of El 
Niño through 2009 and into 2010. 
 
Niuatoputapu and Vava’u is currently in drought.  A 
drought warning is now current for Ha’apai. 
 
The rainfall totals for October and the outlooks for the 
next three months continue to reflect El Nino type 
conditions. Rainfall has been below normal across the 
country in October, Ha’apai recorded 7.7mm, Vava’u 
29.4mm, Niuafo’ou 20.6mm, and Fua’amotu 48.3mm. It 
is the beginning of the Wet season (Nov-Apr) and it is 
also the cyclone season therefore fluctuations of rainfall 
distribution should be expected throughout
.
 
 
Niuafo’ou 
Above Normal >924.0mm 
Normal   
691.7 - 9248.1mm  
Below Normal  <691.7mm 
The model generated outlook is providing a strong signal  
for above normal rainfall.
 
 
 
Niuatoputapu 
Above Normal >857.0mm 
Normal  
647.0mm-857.0mm  
Below Normal  <647.0mm 
The model generated outlook is providing  
a signal for below to normal rainfall.  
 
 
 
 
 
Vava’u
 
Above Normal >883.0mm
 
Normal  
606.0mm–883.0mm 
 
Below Normal  <606.0mm
 
The model generated outlook is providing
  
a strong signal for rainfall to be normal . 
 
 
 
Ha’apai
 
Above Normal  >678.7mm
 
Normal  
431.0mm– 678.7mm 
 
Below Normal  <431.0mm
 
The model generated outlook is providing  
a strong signal for rainfall to be normal.
 
 
Tongatapu
 
Above Normal  >714.3mm 
Normal  
429.3mm-714.3mm  
Below Normal  <429.3mm 
The model generated outlook is providing  
a strong signal for below normal rainfall. 
 
 
Disclaimer: 
This summary is prepared as soon as possible following the 
end of the month, once climate data is received from recording 
stations around Tonga. Delays in data collection, 
communication and processing occasionally arise.  While 
every effort is made to verify observational data, the Tonga 
Meteorological Service does not guarantee the accuracy and 
reliability of the analysis and rainfall predictions  presented, 
and accepts no liability for any losses incurred through the 
use of this summary and its contents.  This information should 
be used as a guidance only. All requests for data and for 
further information about this forecast should be directed to 
the Director of the Tonga Meteorological Service, at P.O. Box 
845, Nuku’alofa. Or email at 
fmt_met@met.gov
Tel: (676) 35