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28 Day Rainfall Forecast

  1. NW Slopes & Plains Rain Forecast


    NW Slopes & Plains 28-day Rainfall Forecast
    Sun Mon Tue Wed Thu Fri Sat
    20
    21
    Med
    22
    Med
    23
    24
    25
    26
    Low
    27
    28
    Med
    29
    Hig
    30
    Med
    31
    Feb 1
    Low
    2
    Low
    3
    Low
    4
    5
    Low
    6
    Low
    7
    8
    9
    10
    11
    12
    13
    14
    15
    16
    17
    CHANCE OF RAINFALL WITHIN DISTRICT
    Nil
    < 25%
    Low
    25 - 50%
    Medium
    50 - 75%
    High
    ≥ 75%

    Issue Notes

    Issued 20 Jan 2021

    The hemispheric long wave pattern has been relatively slow moving in recent weeks. There are four main troughs. Currently the most significant troughs are near the longitudes of South Africa, the southwest Indian Ocean, the Indian Ocean, and the southeast Pacific.

    Summary:

    Over southern and eastern Australia the cold front events with potential to bring widespread rain are now expected about 29 January to 2 February, 7 February to 11 February, and 20 February to 24 February. Rain events originating in the tropics and moving south are possible about 27 January to 31 January, and 8 February to 12 February. Over Western Australia the strongest cold fronts should occur about 25 January to 29 January, 29 January to 2 February, and 16 February to 20 February.

    Forecast Explanation

    This forecast is produced by a multi-model ensemble consisting of dynamical atmospheric models, which are forced by the latest observed atmosphere, ocean, land and ice conditions. The models are designed to simulate features of the real atmosphere, including the daily movement of long and short wave patterns in the Southern Hemisphere.

    The future probability of rain in each district is estimated using output from the multi-model ensemble, combined with historical information about the difference between the model forecasts and observed rainfall.

    In this deterministic framework the skill of the forecast tends to decrease with time, however the forecasts are updated daily to provide the latest estimates of rainfall probability out to 28 days.