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12-Month Rainfall Forecast

  1. Yorke Peninsula 12-month Rainfall Forecast

    Jan
    22
    Feb
    22
    Mar
    22
    Apr
    22
    May
    22
    Jun
    22
    Jul
    22
    Aug
    22
    Sep
    22
    Oct
    22
    Nov
    22
    Dec
    22

    10

    5
    0

    7
    7
    7
    7
    6
    7
    6
    5
    6
    6
    7
    6

    Rainfall deciles

    10
    Well above normal
    8 - 9
    Above normal
    4 - 7
    Near normal
    2 - 3
    Below normal
    1
    Well below normal

    Issue Notes

    Issued 12 Jan 2022

    ENSO status: La Niña. IOD status: Neutral. SAM status: Positive, it is forecast to be mostly positive during the remainder of January. The El Niño–Southern Oscillation (ENSO) is firmly in a La Niña phase. Both the atmosphere and the ocean are now showing established La Niña pattern. La Niña is likely to continue during February, while most models suggest it should return to neutral phase by March. La Niña typically brings above average rainfall to much of Australia, particularly the north and east. The Indian Ocean Dipole (IOD) is currently neutral, while a negative phase caused above average rainfall last winter and early spring. As such, average to above average rainfall is predicted across much of Australia this summer, particularly the north and the east. Heavy rainfall events are also more likely during La Niña years, due the abundant moisture it feeds into Australia.

    Forecast Explanation

    Notes on the concept of deciles

    If all the data in a record are ranked from lowest to highest they can then be divided into 100 equal blocks. These blocks are known as percentiles. The values that fall into the lowest 10% range (from 0 to 10%) are said to be in the first decile, those in the group 10+% to 20% are in the second decile, and so on. Those in the group 90+% to the maximum value recorded are in the 10th decile. The 50% value is a special one known as the 'median'. It is noteworthy since there is the same number of records above and below its value.

    Deciles have been found to be very useful for analysing rainfall in particular as its distribution is not the normal bell-shape distribution but is skewed towards many low values with only a few high values. The deciles can be described in qualitative terms. A table is provided in the accompanying results.