India Meteorological Department has declared onset of monsoon over Kerala today i.e. on 5th June 2015.
Following conditions were observed favouring onset of monsoon over Kerala
- The rainfall over Kerala has been fairly widespread to widespread for the last 48 hours. Out of the 14 rainfall monitoring stations for Monsoon onset over Kerala, more than
70 % of stations have reported rainfall higher than 2.5 mm for last consecutive two days (4th June and 5th June). - Westerly/ West-southwesterly winds of the order of 40-50 kmph were observed upto 600 hecta Pascal level (approximately upto 4.5 km above mean sea level) over south Arabian Sea (equator to Lat. 10oN and Long. 55oE to 80oE).
- The INSAT – 3D derived Outgoing Longwave Radiation (OLR) value in the box confined by Lat. 5-10oN, Long. 70-80oE is less than 200 Watt/metre2 (W/m2) for consecutive last 2 days.
Forecast for next 48 hours
Conditions are favourable for further advance of southwest Monsoon into some more parts of central Arabian Sea, Karnataka; remaining parts of Tamil Nadu, some parts of Rayalaseema and Coastal Andhra Pradesh, some more parts of central & north Bay of Bengal and southern parts of northeastern states during next 48 hours.