Diurnal-scale signatures of monsoon precipitation over India

Rajan, Devaraj ; Iyengara, G R

Abstract

The pattern of diurnal-cycle signatures of precipitation varies with season and region. This study focuses on spatio-temporal variations in numerical model based forecasts of the rainfall amount and its intensity over Indian region during the monsoon season 2013 and some specific days of monsoon season 2017. Spatial patterns of 3-hourly rainfall during the season, as seen in day-1, day-3 and day-5 predictions of two numerical weather prediction models viz NGFS and NCUM have been examined here. Temporal changes in the frequency distribution of hourly rainfall amounts have been studied. It is noted that NGFS model predicts more rain than NCUM model during all the hours of the day. Maximum rainfall over the land and oceanic region has been predicted during the late afternoon and early morning hours, respectively.


Keyword(s)

Southwest monsoon; NGFS; NCUM; Indian land mass; Active; Break; Rain fraction; Convection and precipitation


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