A diagnostic study of contrasting rainfall epochs over Mumbai
DOI:
https://doi.org/10.54302/mausam.v50i1.1797Keywords:
Monsoon rainfall, Thermodynamic parameters, Convective available potential energy, LFC, Synoptic features, Scorer parameterAbstract
An attempt has made to diagnose the synoptic features and some dynamic and thermodynamic parameters associated with contrasting rainfall situations (on consecutive days) during the monsoon season, over Mumbai. Study has been made for two contrasting monsoon years, viz. 1987 (Bad monsoon year) and 1988 (Good monsoon year). For this study RS data of Mumbai have been used.
In many cases heavy rainfall on an isolated day over Mumbai is associated with the following synoptic systems (a) a trough on sea level chart running along west coast through Maharashtra Coast and (b) a cyclonic circulation (CYCIR) over Gujarat in the lower/middle tropospheric level.
At least one of the above two systems ceased to exist on the days of light rainfall.
Weighted average value of moist static energy is more on the day of heavy rainfall. In most of the cases convective available potential energy (CAPE) is also more on the day of heavy rainfall. LFC, on most of the cases, is seen to have lowered down on the days of heavy rainfall. Variation in upper air flow pattern and scorer parameter also gave very interesting clues to variation of rainfall on contrasting days.
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