The prolonged spell of pre-monsoon weather activity lasting over one week is coming up for entire Northeast India. Mild start with light rainfall at scattered places over Arunachal Pradesh and Assam will commence today and gradational pick up in the subsequent 48 hours will encroach the entire region. Peak weather activity is expected between 09th April and 13th April. Arunachal Pradesh, Assam and Meghalaya are likely to observe intense strike of thunderstorm and lightning accompanied with gusty winds during this period. Nagaland, Manipur and Mizoram are expected to witness moderate thunderstorm with occasional lightning and rain. The state of Tripura will mostly remain benign and only a few places will have a mild thunderstorm and intermittent showers.
A cyclonic circulation is persisting over parts of South Bihar, Jharkhand and neighbouring West Bengal. The semi-permanent anti-cyclone over North Bay of Bengal has been slightly displaced and this feature is rushing moist southwesterly winds over the northeast region. Valley easterly winds, the sign of good weather over the region, is getting replaced and ushering vast spread of thunderclouds. Most of this hazardous weather activity is expected to occur during the late evening and night with sufficient breaks in the day time.
Pre Monsoon season so far has generally remained mild over Northeast India. All the states are reeling with large deficiencies except Meghalaya. While Arunachal Pradesh and Assam are deficit with 41% and 43%, Mizoram tops the list with a huge shortfall of 71%. Tripura stands next with a shortage of 51%. The upcoming spell is expected to make up the shortfall to a reasonable extent. There are good chances for the region to get another spell with a short break in between and April may save the grace to compensate for the shortfall.