India Meteorological Department declares onset of monsoon over Kerela

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.