Although the southwest monsoon this yr is at its fag finish, there are not any rapid indicators of rain over Pune ending anytime quickly. Because the starting of this week, Pune has skilled intense spells of rain round midnight, which someday go on until the following morning. The rainfall depth throughout these incidents ranged between 45mm and 90mm in a 24-hour interval. A lot of the rainfall occurred inside a window of two to 4 hours, besides on Wednesday, when it rained from eight pm on Wednesday until 6 am on Thursday.
A shut take a look at the 24-hour rainfall report maintained by the India Meteorological Division means that the wettest spell of the final three days was not recorded on Thursday morning, which obtained 53.1mm rain. Rainfall throughout the identical interval within the metropolis, recorded on Wednesday and Tuesday, was 87.3mm and 55.9mm, respectively.
What brought on such intense rain within the final three days?
The monsoon is presently in its very weak section as it’s quick approaching withdrawal. Regardless of this, the 2 persisting climate techniques – an higher air cyclonic circulation mendacity over Konkan-Goa-Karnataka and a system over Rayalaseema, Telangana and elements of Maharashtra, contributed to some rain exercise over the state throughout this week. On Thursday, a trough developed that ran between south-central Arabian Sea, via Maharashtra, Chhattisgarh and all the best way as much as Bihar.
Why did it rain within the night or evening?
This was primarily due to the convective exercise related to hovering day temperature, together with moisture ranges over Pune metropolis. For example, the moisture stage recorded on Tuesday was 91 per cent, which is a standard moisture stage recorded over a coastal metropolis at any time of the yr. The day temperatures fluctuated between 28 levels Celsius and 32 levels Celsius throughout peak afternoon hours, and largely remained a notch above regular.
Because of these temperature fluctuations, IMD officers mentioned a phenomenon known as photo voltaic insolation occurred. Merely put, when the prevailing cloud cowl through the day offers a way for photo voltaic radiation to chop via and attain the earth’s ambiance, this ends in a sudden spike in day temperatures. This, in flip, pushes up the moisture ranges and results in formation of Cumulous Clouds (Cu) and later Cumulonimbus clouds(Cb). Cb clouds are recognized to trigger convective actions — thunder, lightning and intense rainfall inside a brief span of time, defined Anupam Kashyapi, head of the climate division of IMD, Pune.
What’s the forecast for the following few days?
In keeping with IMD, the thunderstorm will proceed even on Friday because the prevailing cloud cowl stays hovering over the town. Although the rainfall depth is anticipated to cut back after Friday, mild rain accompanied by thunder will proceed, mentioned meteorologists.