Open AccessA Statistical Technique for Medium Range Forecasting of of Rainfall over Calcutta during the Southwest Monsoon Season
Author(s) -
P. P. SAJNANI
Publication year - 1964
Publication title -
mausam
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.243
H-Index - 12
ISSN - 0252-9416
DOI - 10.54302/mausam.v15i2.5529
Subject(s) - radiosonde , monsoon , climatology , period (music) , environmental science , meteorology , geography , geology , physics , acoustics
An objective procedure for predicting the rainfall of Calcutta during each of the 5-period of the monsoon season has been evolved. The technique is the same as was developed by Jagannathan and Ramamurthi (1961) for the prediction of 5-day rainfall at Bombay. The daily rainfall data of Alipore (Calcutta) for the period 1921, to 1950 were used for the classification of the rainfalls. The technique was evolved on the base of available Indian radiosonde data for 1950 to 1958 and tested on the basis of independent data for 1959 to 1961. This has shown a skill score of 0.46.
Besides the study has revealed the close relationship between the topography of the 700 and 500mb pressure surfaces over India and the subsequent pentad rainfall over Calcutta particularly during the monsoon season.