South West Monsoon 2015 has till today the 23rd of June 2015 covered more than half the country with the northern limit lying on From West to East - Veraval, Surat, Ratlam, Bhopal, Ambikapur,
Bhagalpur and Supaul, still 5 - 6 days later than normal, although with twin systems in the Bay of
Bengal and Arabian sea is expected to reach Punjab by the 28th or 29th of June about 3 days earlier
than normal which will be a big relief for farmers and administration up north.
The big news though is that the monsoon is currently in excess of 15% for the month and season so far which has caught many by surprise after the outlook by the IMD which was taking into account the effects of an el nino.
The main reasons contributing to the excess and active phase of the monsoon is a mildly strong MJO
or Madden-Julian Oscillation - An equatorial Indian ocean system of currents that oscillates east to west and at different levels of intensity. The current MJO phase could last till the 26th or 27th of the month.
One more factor for the strong monsoon is a neutral IOD or Indian ocean dipole - again an anomaly in the sea surface temperatures in the Indian ocean which normally tends to counteract the El Nino. The IOD for week beginning the 22nd June showed it moving into a positive phase which should be good for the monsoon for the next week or so as well.
To Summarize, Monsoon should cover most of the country by the end of June with twin systems in
the bay and Arabian sea, temperatures still very high in Rajasthan and Pakistan with the worst heat
wave in decades, And a favorable MJO and IOD and a weak el Nino currently.
The next 9-10 days would continue to bring heavy to very heavy rainfall along west coast and
central India, South India will see a decline in rainfall from today.
Forecast for coming weeks and rest of the monsoon.
Decline in rainfall over south India for next 2 weeks.Increase in rainfall over central and North India.
Strengthening of El Nino and weakening(neutral phase) of MJO and IOD around Second week of July.
July could see below normal rainfall over most of India except for a few places in West coast and North India.
