Kerala’s wettest October in 122 years

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Kerala witnessed 589.9 mm (94 per cent surplus) rainfall in October, a determine by no means seen since 1901, in response to information supplied by the Indian Meteorological Department (IMD). Kerala recorded extra rain than its October to December seasonal common of 492 mm in October alone.

Between 1901 and 2020, Kerala’s October rainfall crossed 500 mm solely on three events — 1999 (567.9mm), 1932 (543.2mm) and 2002 (511.4mm) and never as soon as within the final decade.

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Similar rainfall developments have been reported from eight different states and union territories, when October rainfall was larger than the quantum usually recorded in the course of the put up monsoon season of October to December.

At 100.7 mm, India’s October rainfall was 33 per cent above regular.

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This yr, Jammu and Kashmir and Uttarakhand skilled their fifth wettest October since 1901, the IMD information revealed. Last month, Jammu and Kashmir recorded 100.eight mm (182 per cent surplus) rain whereas over Uttarakhand it was 203.2 mm (476 per cent surplus).

Delayed withdrawal of the southwest monsoon was the prime purpose for such massive rainfall variations, particularly over southern peninsular India. Cyclone Gulab and later Cyclone Shaheen additionally contributed to the general rainfall throughout early October. The two cyclones precipitated important delay within the graduation of the withdrawal from northwest India. Normally, monsoon withdraws fully by October 15 however this yr, it was realised solely on October 25. As a outcome, Kerala, Mahe, Tamil Nadu and components of coastal Karnataka didn’t have a break in rainfall exercise between the 2 monsoon seasons, thus including to the general month-to-month rainfall.

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Favourable and moist situations attributable to sturdy easterly winds and their interplay with low strain programs within the Bay of Bengal stored the monsoon lively in south India, particularly over Kerala in mid-October.

Over northern India, the early arrival of sturdy western disturbances and their interactions with moisture-laden easterly winds introduced heavy to very heavy rain over Uttarakhand, east Uttar Pradesh, Bihar, West Bengal and Odisha. It additionally led to early snowfall and precipitation over Jammu and Kashmir and Ladakh attributable to passing western disturbances.

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