The India Met Department (IMD) has prolonged its outlook, for Sunday, to intensification of a low-pressure space within the Arabian Sea, the fulcrum of the at present enhanced North-East monsoon exercise.

Read the IMD climate bulletin right here

The ‘low’ lies over East-Central Arabian Sea (to the North of Lakshadweep Islands and just a little distance away from the Karnataka-Goa coasts), topped off by an related cyclonic circulation.

JTWC Outlook

The US Joint Typhoon Warning Centre (JTWC) has regarded on the system (denoted as ’97A’ with a bearing from the Masirah Island (off Oman) at a distance of 1,230 km to the South-East.



It has assessed it as ‘a broad space of dis-organised convection’ (the method of cloud-building that’s important to strengthening as a storm) and minimal higher degree turning.

Satellite pictures additional depict small pockets of weak, convective bands to the South and East of the system, primarily referring to the flows from the Arabian Sea and feed-ins from the Bay of Bengal. But low vertical wind shear values (the speed at which winds change route and pace with top) and heat sea floor temperatures (that help convection) are conducive for additional improvement.

Global fashions, in accordance to the JTWC, would appear to recommend a continued observe to the West (away from Karnataka-Goa coasts) into Monday winds remaining at 46 km/hr.

During this era, the potential for improvement of a ‘important’ climate system (despair or above) is assessed as low, although it doesn’t appear to rule out scope of intensification later.  

It is on this context that the outlook by the IMD, in whose jurisdictional waters the system lies, that the system would get ‘extra marked’ (intensification by a spherical to a well-marked ‘low’) has to be seen.  The IMD additionally has picked out a trough (an elongated space of low stress) popping up afresh over the Bay of Bengal linking its South-West Bay of Bengal (off Tamil Nadu) to the Sri Lanka coast.

Atmospheric river

The trough acts as an atmospheric reservoir to retailer moisture mopped up by the easterly winds from the Bay of Bengal that get piped into the South Peninsula as rain.

The ‘low’ within the Arabian Sea and the trough within the Bay will mix to set off pretty widespread to widespread rainfall with remoted heavy falls and thunderstorms, accompanied by lightning, over the complete South India in the course of the subsequent 4 days, the IMD outlook.

But it singled out South Interior Karnataka and Tamil Nadu for extreme climate, predicting remoted heavy to very heavy falls are possible throughout this era. Fairly widespread to widespread rainfall with remoted heavy falls and thunderstorm and lightning is forecast for Madhya Maharashtra, Marathawada, Konkan and Goa on Monday and Tuesday.

Weather evolving over North-West India and adjoining Pakistan are additionally related in how passing western disturbances, periodical low-pressure waves, might have implications for the Arabian Sea ‘low.’

A western disturbance lies already over Jammu & Kashmir on Sunday with its offspring cyclonic circulation having moved upfront, precipitating hail and thunderstorms over components of North-West India.

Follow up disturbance

A western disturbance ‘induces’ an offspring circulation to kind whether it is endowed with the required depth and depth, during which case it may well impression concurrent methods within the Arabian Sea.

The offspring circulation has travelled to the East (forward of its mum or dad western disturbance) into North-West Uttar Pradesh, even as the IMD has predicted a follow-up disturbance to arrive.

Meanwhile, the IMD has pointed to a scenario the place the present ‘low’ over the Arabian Sea weakens and being changed a counterpart ‘low’ being despatched in from the Bay of Bengal. It would cross the peninsula and step in into the Arabian Sea, bringing one other wave of heavy to very rainfall over the South Peninsula and particularly alongside the West Coast later throughout this week.

Click right here to learn the Numerical Weather Prediction forecast

The rising scenario is finest captured by the US National Centres for Environmental Prediction citing a potential ‘low’ passing over Sri Lanka, South Peninsula and Lakshadweep within the first week of November.


Detailed IMD forecast for Sunday stated that heavy to very heavy rainfall lash remoted locations over South Interior Karnataka, Tamil Nadu, Puducherry, and Kerala. It could be heavy at remoted locations over Chhattisgarh, Madhya Maharashtra, Marathawada, Konkan & Goa, Coastal Andhra Pradesh, Telangana, Rayalaseema and North Interior Karnataka.

Thunderstorms are possible over Madhya Pradesh, Vidarbha, Chhattisgarh, Bihar, Jharkhand, plains of Bengal,  Odisha, Madhya Maharashtra, Marathwada, Konkan & Goa, Coastal Andhra Pradesh, Telangana, Rayalaseema, Karnataka, Tamil Nadu, Puducherry, and Kerala.

Squally climate with winds reaching speeds of 55 km/hr are possible over East-Central Arabian Sea and adjoining Maharashtra-Karnataka-Kerala coasts. Fishermen are suggested not to enterprise into these areas.

An prolonged outlook from October 25 to 27 stated that pretty widespread to widespread rainfall with remoted heavy falls are possible over south India whereas it wold be scattered to pretty widespread rainfall over the hills of North-West India (thanks to the western disturbances) and remoted to scattered rainfall over East and North-East India due to their observe to the East.

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