Assam, Meghalaya recorded highest June rainfall in 121 years: IMD | Latest News India - Hindustan Times

Assam, Meghalaya recorded highest June rainfall in 121 years: IMD

ByJayashree Nandi, New Delhi
Jul 07, 2022 03:40 AM IST

Kerala and Mahe were the fourth lowest since 1901 recording only 308.7 mm of rainfall in June, a report on climate summary by IMD stated.

Assam and Meghalaya recorded the highest June rainfall in 121 years with 858.1mm precipitation, breaking the earlier record of 789.5mm recorded in 1966, but rainfall over Kerala and Mahe were the fourth lowest since 1901 at 308.7mm, a climate summary for June prepared by the India Meteorological Department (IMD), Pune said.

The climate summary points to an extremely skewed distribution of rainfall in June. (FIle image)
The climate summary points to an extremely skewed distribution of rainfall in June. (FIle image)

The report also estimated that over 313 people died; 72 people were injured; 50 were missing and over 72,000 livestock perished due to heavy rainfall and lightning in the first month of monsoon.

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Most deaths due to flooding were in the North-east, particularly in Assam, Arunachal Pradesh, Meghalaya and Manipur (Noney landslide), and most of the lightning-related deaths were reported from Bihar, Andhra Pradesh, Maharashtra, Uttar Pradesh and Madhya Pradesh.

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Heavy rainfall in May and June led to severe flooding in Assam and Meghalaya this year killing over 150 persons, triggering landslides and inundating large parts of the state. Southerly and southwesterly affected the Eastern Himalayan region in June. Copious amounts of moisture from Arabian Sea and Bay of Bengal accumulated in the region leading to extremely heavy rain.

"We see a consistent increasing trend in extreme rainfall events since 1950s over Gujarat, Maharashtra, Madhya Pradesh, Chhattisgarh, Telangana, Odisha, Jharkhand, Assam, Meghalaya and parts of Western Ghats – Goa, north Karnataka and central Kerala. Our research links these monsoonal changes to rapid warming in the Indian Ocean, particularly the Arabian Sea region.

Urbanisation and land use changes can affect the way the rains and floods are manifested across cities and townships, as landslides and flashfloods intensify due to their compounding effects," Roxy Mathew Koll, climate scientist at Indian Institute of Tropical Meteorology had said on June 23 during the Assam floods.

The average maximum, minimum and mean temperature for the country as a whole in June 2022 were 34.12 degrees C, 25.06 degrees C and 29.59 degrees C respectively, against the normal of 33.73 degrees C, 24.76 degrees C and 29.25 degrees C based on the period of 1981-2010.

The climate summary points to an extremely skewed distribution of rainfall in June. During June, only one low-pressure system formed over the Arabian Sea on June 27-28, leading to only two low-pressure system days against the normal of 10.24 such days. The low-pressure systems formed during the monsoon season contribute to heavy and very heavy rainfall over many parts of the country.

“Fewer low-pressure systems in June are mainly responsible for rainfall deficiency over the central Indian region,” the report has said.

Rainfall over the country as a whole for June 2022 was recorded at 152.3 mm, which is 8% less than its Long Period Average (LPA) of 165.3mm.

“One of the main reasons for skewed rainfall distribution in June was absence of low-pressure systems which plays an important role in bringing rain to central India. Another reason if you look at the larger circulation features, the Madden Julian Oscillation (MJO) was in an unfavourable location for rainfall; moreover, there was low typhoon activity over the northwest Pacific, which together led to patchy rains in India,” said OP Sreejith, head, climate monitoring and prediction group, IMD, Pune.

Also read: IMD issues red alert in 3 coastal districts

MJO is a band of rain clouds that moves eastwards over the tropics and is responsible for most weather variations in the region — including the south-west and north-east monsoons.

Widespread and heavy rain continued over west coast and central India on Tuesday and Wednesday.

Extremely heavy rainfall (over 20 cm) occurred over several places in Coastal Karnataka, West Madhya Pradesh, Konkan & Goa, Madhya Maharashtra, heavy to very heavy rainfall (11.5 to 20 cm) occurred over Telangana, Odisha, Gujarat State, Assam, Meghalaya, Kerala, Mahe, Tamil Nadu, Puducherry, Karaikal, South Interior Karnataka and heavy rainfall at isolated places over Haryana-Chandigarh, Punjab, East Rajasthan, Uttarakhand, Himachal Pradesh, Chhattisgarh, Sub Himalayan West Bengal, East Rajasthan, North Interior Karnataka and Coastal Andhra Pradesh and Yanam.

The low-pressure area which formed over Odisha on July 3 is lying over Kutch and neighbourhood with the associated cyclonic circulation extending up to mid tropospheric levels. It is likely to move further westwards and become less marked during the next 24 hours. The monsoon trough is active and south of its normal position. Its western end is very likely to shift gradually northwards from tomorrow.

An east-west shear zone is running above mean sea level. An off-shore trough is at mean sea level running from Gujarat coast to Karnataka coast. A cyclonic circulation is also lying over north Odisha and adjoining Chhattisgarh.

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