08 Jun 2019

Red, orange alerts sounded as monsoon hits Kerala

India

Red, orange alerts sounded as monsoon hits Kerala
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Vishal Malhotra

Vishal Malhotra

Asked on 8 June, 2019

How is onset of Monsoon determined?

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Monsoon season is said to have arrived if after May 10, 60% of available stations — Minicoy, Amini, Thiruvananthapuram, Punalur, Kollam, Allapuzha, Kottayam, Kochi, Thrissur, Kozhikode, Thalassery, Kannur, Kudulu and Mangalore— witness a rainfall of over 2.5mm for two consecutive days or more. Additionally, the speed of the westerlies and long-wave radiation are two other factors which help determine the onset of monsoons.

Ridhi Mukopadhyay

Ridhi Mukopadhyay

Asked on 8 June, 2019

What is Long Period Average?

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LPA is defined as the rainfall received by the entire country during the southwest monsoon over a period of 50 years. Currently, the LPA is 89cm, based on the average rainfall between 1951-2000. Under 90% LPA is considered deficit rainfall, while over 110% is excess.

Shaurya Rangan

Shaurya Rangan

Asked on 8 June, 2019

When will monsoon arrive in Delhi?

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The IMD reports that in Delhi, monsoon is likely to be delayed by two-three days from its usual onset on June 29. According to Skymet, it might take a week longer.

Vihaan Patil

Vihaan Patil

Asked on 8 June, 2019

Which Kerala districts are on red alert?

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The IMD has also issued a red alert, implying 'very heavy' to 'extremely heavy' rainfall, in four Kerala districts: Thrissur on June 10, and Ernakulam, Malappuram, and Kozhikode on June 11.