Mumbai's weather has been erratic since December, an indication of the worldwide phenomenon of climate change, says Dr R V Sharma, deputy director general, India Meteorological Department (IMD).
The city had 76 mm rain on Monday with the maximum temperature plummeting to an uncharacteristic 24.7°C in Colaba and 25°C in Santacruz. As Newsline traced the weather over the past year, "anomalies" showed since mid-December.
December
Untimely clouds replaced the winter nip. IMD had said these were non-rainy, formed due to unusual interaction between the easterly and westerly systems. Yet, December ended on a rather chilly note, Santacruz recording 12.8°C on December 31, the second lowest December temperature in a decade.
January
The cold winter came to an abrupt end on New Year's Day, as an incursion of northeasterly and easterly winds lifted temperatures to around 18.4-30.6°C and in Colaba and 15.3-31.6°C in Santacruz. By the third week, the maximum was 37°C, before dipping to 32°C. The minimum that winter remained around 20°C, two degrees above normal.
At the end of that month, when winter usually peaks, IMD said it was one of the four hottest Januarys in a decade with the temperature reaching 36°C and over on January 23 and 24.
March
Summer officially began on March 1 but the temperature was already touching 37°C, a degree above normal for the season. By March 10, the temperature had soared so high, it caused impromptu thunderstorms and localised rains. Such conditions lasted nearly a week. The Met department had said such local weather systems are caused due to severe moisture accumulated in a particular small region due to a steep rise in temperature.
April
April 1 had a maximum of 40.6°C, the highest in 57 years, after the 42.2°C of April 14, 1952. Soon after that, however, the mercury dropped as abruptly as a cyclonic circulation on the south Konkan belt on April 13 brought rainfall in several areas of south Maharashtra including Mumbai. By mid-April, Mumbai had settled at 33°C, but was still a degree above the season's normal.
May
Summer usually lasts between March 1 and May 31; this year, the first pre-monsoon showers came much earlier, on May 20 across the western suburbs and the city. Pre-monsoon showers are expected by the first week of June, about seven to 10 days before the actual monsoon begins on June 10. This year, the currents had hit Karnataka nearly 20 days before schedule.
Yet, despite the early promise, the southwest monsoon did not reach Mumbai till June 24, a fortnight late. This was due to Cyclone Aila. It was the second longest delay in half a century; in 1959, the monsoon had hit Mumbai on June 25.
June
By end of the month, the city had a 50 per cent rain deficit.
Now, with rain when the monsoon is supposed to be drawing to an end, Sharma of IMD said, "These can been seen as the regional effects of the worldwide phenomenon of global warming. IMD had earlier issued a warning about temperature increase in the city. Cooling is occurring faster at the higher level and heating faster at lower levels. The normal temperature ranges are changing."
He said the current weather conditions are posing a major challenge to meteorologists. "Earlier such inconsistent occurrences were noticed in the extreme regions; now tropics are beginning to see them."
Milind Majumdar, a senior scientist working on the climate modelling region at IITM, Pune, does not see a link with global warming. "The weather in Mumbai is going through a phase, or in other words, the season is changing. At this time, the wind flow shifts from a southwesterly to a northeasterly direction. This year, a low pressure system over the Bay of Bengal got trapped in the transitional systems, bringing rains to several regions of the southern peninsula," he said.
No comments:
Post a Comment