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South West Monsoon hits Kerala on Monday: IMD

| @indiablooms | Jun 01, 2020, at 04:21 pm

New Delhi/UNI:  Indian Meteorological Department (IMD) on Monday informed that the south West Monsoon has arrived in Kerala and has coincided with it original date.

The IMD, in an official release, said that widespread rainfall occurred over Kerala, during past two days. More than 70 percent of the 14 rainfall monitoring stations for Monsoon onset over Kerala have reported rainfall during last 48 hours.

The westerly winds have strengthened in the lower levels (wind speed up to 20 knots) and deepened up to 4.5 km over the south Arabian Sea whereas there has been a persistent convection (cloudiness indicated by Outgoing Longwave Radiation values < 200 Wm-2) from satellite imagery and coastal Doppler Weather Radars from May 27 onwards.

“In addition to the above features, a low pressure area has formed over Southeast and adjoining East-central Arabian Sea and Lakshadweep area on May 31, which intensified into a depression over east-central and adjoining southeast Arabian Sea on Monday morning.

The central weather monitoring department took the set criteria for declaration of monsoon over Kerala on the facts such as rainfall after May 10,if 60 percent of the available 14 stations in the list that include Minicoy, Amini, Thiruvananthapuram, Punalur, Kollam, Alapuzha, Kottayam, Kochi, Vellanikkara (Thrissur), Kozhikode, Thalassery, Kannur, Kudulu (Kasargod) and Mangaluru report rainfall of 2.5 mm or more for two consecutive days, the onset over Kerala be declared on the second, provided other criteria are also in concurrence.

Outgoing Long Wave Radiation (OLR) INSAT derived OLR value should be below 200 wm-2 in the box confined by Lat. 5-10ºN and Long. 70-75ºE, it added.

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