SIX-MONTHLY OUTLOOK FOR ANTIGUA  SEP 2016 TO FEB 2017

 Dale C. S. Destin (follow @anumetservice)

 

Antigua and Barbuda Meteorological Service
Climate Section

   

Issued Sep 9, 2016

Please Take Our Weather Survey

 
Based upon model data, observations and subjective input, the following is the rainfall and temperature outlook for Antigua for the period September 2016 to February 2017:  

Rainfall

Above to near normal rainfall is expected, with a confidence of 80%. The chance of drier than usual weather is slight - 20%. The island-average rainfall is expected to be greater than 746.8 mm (29.4 in). Probabilistically, there is a

   •  50% chance of above normal rainfall;
   •  30% chance of near normal rainfall (612.1 to 746.8 mm or 24.1 to 29.4 in) and
   •  20% chance of below normal rainfall.

Temperature

Warmer than normal temperature is likely, with a confidence of 75%. The chance of cooler than normal weather is slight - 5%. The mean temperature is likely to exceed 26.7 °C (80.1 °F). Probabilistically, there is a

  •  75% chance of above normal temperature;
  •  20% chance of near normal temperature (26.4 to 26.7 °C or 79.5 to 80.1 °F) and
  •  5% chance of below normal temperature.

This outlook is largely predicated on sea surface temperature (SST) patterns across the tropical Atlantic and Pacific Oceans.

More outlooks: September, September to November, December 2016 to February 2017, Drought  

The next will be issued by OCtober 5.  

 
 

Definition

The following definitions are being observed based on the 1981 to 2010 dataset:

  •  Well below normal: Values in the lowest 10% of the dataset
  •  Below normal (lower or less than normal): Values in the lowest 33.3% of the dataset
  •  Near normal (normal or usual): Values in the middle 33.3% of the dataset
  •  Above normal (more or higher than normal): Values in the highest 33.3% of the dataset
  •  Well above normal: Values in the highest 10% of the dataset

Background

CliSec's six month outlooks are general statements about the probability or risk of above, near or below normal (rainfall) over a six-month period. The outlooks are based on the statistics of chance (the odds) taken from Antigua's rainfall and mainly sea surface temperature records for the tropical Pacific and Atlantic Oceans. They are not, however, categorical predictions about future rainfall, and they are not about rainfall within individual months of the six-month outlook period.

Probability outlooks should not be used as if they were categorical forecasts. These outlooks

should be used as a tool in risk management and decision making. The benefits accrue from

long-term use, say over 10 years. At any given time, the probabilities may seem inaccurate,

but taken over several years, the advantages of taking account of the risks should outweigh

the disadvantages. For more information on the use of probabilities, farmers could contact

their local departments of agriculture.

Disclaimer

The information contained herein is provided with the understanding that the Antigua and Barbuda Meteorological Service makes no warranties, either expressed or implied, concerning the accuracy, completeness, reliability, or suitability of this outlook. The information may be used freely by the public with appropriate acknowledgement of its source, but shall not be modified in content and then presented as original material.