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Vinson Kurian

Thiruvananthapuram, April 1 The unsettled weather in the Northeast will continue to hold for two more days with thunder squalls and hailstorms thrown in between.

Neighbouring West Bengal and Sikkim too will find themselves caught in the action as a causative trough in the westerlies (associated with a fading western disturbance) lay anchored from east Bihar to Northwest Bay of Bengal.

Meanwhile, a couple of international models maintained their watch for a probable ‘stormy’ churn in the Bay of Bengal basin during the second week of April.

The skies over the Northeast are forecast to open up thanks to the continued moisture feed from the Bay of Bengal mixing with the cooler northwesterlies against the background of a heated up land.

India Meteorological Department (IMD) has forecast scattered to fairly widespread rain or thundershowers accompanied with isolated to scattered thunder squall and hail over the Northeastern States, West Bengal and Sikkim during the next two days.

Thunder squall accompanied with and featuring winds speeding to 50 km/hr or above is likely over Assam, West Bengal and Arunachal Pradesh.

Squall lines need the heat and humidity to really build up strength, but once the causative system passes, the cooler and less humid air filters in and thunderstorms no longer have the fuel they need to form.

The strong winds at the surface are usually a reflection of dry air intruding into the line of storms, which when saturated, falls quickly to ground level due to its much higher density before spreading out downwind.

The weather-maker trough extending from East Bihar to Northwest Bay of Bengal let out a weaker ‘limb’ heading west-southwest into Central India to link South Madhya Maharashtra through South Chhattisgarh.

In this manner, the rain or thundershower regime from West Bengal and Sikkim would look to expand its footprint into Orissa and Jharkhand.

Thundershowers are likely at many places over the region during next 48 hours and at a few places thereafter. This weak trough or ‘wind discontinuity’ will trigger isolated thunderstorms over Madhya Maharashtra and Marathawada.

The IMD is expecting yet another disturbance to sprint in around the weekend.

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