Rainfall Anomaly Index (RAI)

Rainfall Anomaly Index (RAI)

 

Index name: Rainfall Anomaly Index (RAI).

Ease of use: Yellow.

Origins: Work began in the early 1960s by van Rooy.

Characteristics: Uses normalized precipitation values based upon the station history of a particular location. Comparison to the current period puts the output into a historical perspective.

Input parameters: Precipitation.

Applications: Addresses droughts that affect agriculture, water resources and other sectors, as RAI is flexible in that it can be analysed at various timescales.

Strengths: Easy to calculate, with a single input (precipitation) that can be analysed on monthly, seasonal and annual timescales.

Weaknesses: Requires a serially complete dataset with estimates of missing values. Variations within the year need to be small compared to temporal variations.

References:
Kraus, E.B., 1977: Subtropical droughts and cross-equatorial energy transports. Monthly Weather Review, 105(8): 1009-1018. DOI: 10.1175/1520-0493(1977)105<1009:SDACEE>2.0.CO;2.

van Rooy, M.P., 1965: A Rainfall Anomaly Index independent of time and space. Notos, 14: 43–48.

22 Responses

    1. Dear Anudeep,

      Please be more specific in your request? I am assuming that you talking about the RAI?

      IDMP team

    2. Dear Anudeep,

      Please be more specific in your request? I am assuming that you talking about the RAI?

      IDMP team

    1. Dear Munmun Rahman,

      We only have the two references of the RAI:
      Kraus, E.B., 1977: Subtropical droughts and cross-equatorial energy transports. Monthly Weather Review, 105(8): 1009-1018. DOI: 10.1175/1520-0493(1977)105<1009:SDACEE>2.0.CO;2.

      Yon can download the first one here:
      https://journals.ametsoc.org/doi/pdf/10.1175/1520-0493%281977%29105%3C1009%3ASDACEE%3E2.0.CO%3B2

      van Rooy, M.P., 1965: A Rainfall Anomaly Index independent of time and space. Notos, 14: 43–48.

      IDMP Team

    2. Dear Munmun Rahman,

      We only have the two references of the RAI:
      Kraus, E.B., 1977: Subtropical droughts and cross-equatorial energy transports. Monthly Weather Review, 105(8): 1009-1018. DOI: 10.1175/1520-0493(1977)105<1009:SDACEE>2.0.CO;2.

      Yon can download the first one here:
      https://journals.ametsoc.org/doi/pdf/10.1175/1520-0493%281977%29105%3C1009%3ASDACEE%3E2.0.CO%3B2

      van Rooy, M.P., 1965: A Rainfall Anomaly Index independent of time and space. Notos, 14: 43–48.

      IDMP Team

  1. Unfortunately, I am not aware of any software to calculate this index. Have you looked at the two references (Kraus, 1977 and van Rooy, 1965)??

  2. Unfortunately, I am not aware of any software to calculate this index. Have you looked at the two references (Kraus, 1977 and van Rooy, 1965)??

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