A weather system over the Bay of Bengal is set to bring rain to Telangana in the first days of November, with heavy showers expected in isolated parts of nine districts on November 2, according to the India Meteorological Department.
The districts named in the heavy rainfall warning for November 2 are Adilabad, Kumaram Bheem Asifabad, Mancherial, Jagtial, Mahabubnagar, Nagarkurnool, Wanaparthy, Narayanpet and Jogulamba Gadwal. The warning covers isolated places within those districts rather than every part of each district, which is an important distinction for residents trying to judge what the forecast means for their own town or village.
Forecasters said Telangana would receive light to moderate rainfall more broadly from November 2 to November 4, with isolated heavy rainfall also possible on November 3 and November 4. On November 3, the heavy rainfall warning narrows to five districts in the south of the state: Mahabubnagar, Nagarkurnool, Wanaparthy, Narayanpet and Jogulamba Gadwal.
Hyderabad, too, is expected to receive light to moderate rainfall during this period, rather than the heavier falls warned of elsewhere.
The system at the centre of the forecast is a depression over the southeast Bay of Bengal. Based on observations at 11.30 am on October 31, the India Meteorological Department tracked it moving west-northwestwards. The forecast track took it towards the Andhra Pradesh coast on November 2, before it moved inland towards Telangana.
A second aspect of the same evolving situation, reported alongside the depression, was the possibility that the system could strengthen into a cyclonic storm before reaching the Andhra Pradesh coast, and then weaken into a deep depression by the time it reached Telangana.
S. Stella, head of the India Meteorological Department centre in Hyderabad, told The Hindu that the system would weaken considerably before reaching Telangana and that the state was unlikely to feel the impact of a cyclonic storm. In her assessment, it would arrive as a depression only.
That distinction matters, because a depression and a cyclonic storm carry very different wind and rainfall risks, and the Hyderabad centre's message was one of rain to prepare for rather than a storm to brace against in the same way as a coastal landfall.
Thunderstorms accompanied by lightning and gusty winds are also part of the picture. Winds of 30 to 40 kilometres per hour are likely across all districts on November 1 and November 4, according to the wider forecast reported in Telangana, while in the districts under the heavy rain warning on November 2 and November 3, wind speeds could reach 40 to 50 kilometres per hour.
Isolated rain is also forecast on November 5 and November 6, although no warnings have been issued for those days.
The timing of the rain is significant because Telangana has just closed an unusually dry October. Data from the Telangana State Development Planning Society, cited in reporting on the November outlook, put the state's rainfall between June 1 and October 31 at 628.2 millimetres, against a normal of 830.7 millimetres for the same period.
That is a shortfall of roughly a quarter, and it helps explain why even a few days of rain in early November are being watched closely by farmers, city officials and households alike.
The India Meteorological Department's November outlook, issued on Saturday, also pointed to warmer than usual days through the month over most parts of Telangana. At the same time, the outlook pointed to below normal rainfall over much of the state for November as a whole, with a forecast of rainfall below 77 per cent of the long period average for five south peninsular meteorological subdivisions. The long period average is based on a 50 year rainfall record.
Taken together, those two signals describe a month that may feel warm overall, with rain arriving in bursts rather than as a sustained wet spell.
Very strong El Nino conditions are likely to persist through November and December, the outlook said, while neutral Indian Ocean Dipole conditions are expected to continue until December. Both are large scale patterns that forecasters watch when they assess seasonal rainfall, although neither on its own decides what happens on a particular day in a particular district.
The day to day forecast, with its district warnings and wind speeds, remains the more useful guide for immediate decisions.
For people in the nine districts named for November 2, the practical meaning of an isolated heavy rainfall warning is that some places could receive a sharp downpour even if neighbouring areas stay comparatively dry. Low lying roads can collect water quickly in such conditions, and visibility can drop during a thunderstorm.
Residents are generally advised to follow the latest district level updates from the meteorological department and local authorities, to avoid sheltering under trees or near unstable structures during lightning, and to allow extra time for travel if rain sets in.
For farmers, the arrival of rain after a dry October cuts both ways. Moisture can help standing crops and soil conditions, but a heavy burst accompanied by gusty winds can also damage crops that are close to harvest or already cut and lying in fields.
The fact that the heaviest falls are expected in isolated pockets, rather than uniformly, means the effect is likely to vary sharply from one mandal to another, and local field conditions will matter more than any state wide summary.
In Hyderabad and other urban centres, light to moderate rain is less likely to cause widespread disruption, but even moderate falls can slow traffic at peak hours and lead to waterlogging in known low lying stretches. The city's experience of sudden showers is that the first spell after a dry period often brings the most visible disruption, as drains and roads adjust to the change, and commuters would be wise to check conditions before setting out on November 2 and November 3.
The forecast also sits within a busier period for weather over the Bay of Bengal. A separate system, Cyclone Arnab, had already affected the region, and the new depression formed in its wake. That sequence is not unusual in the post monsoon season, when the Bay of Bengal frequently produces one system after another, and it is one reason forecasters update their tracks several times a day as fresh observations come in.
What happens next will depend on how the depression behaves as it nears the coast. If it weakens as expected before reaching Telangana, the state should see the rain pattern described here, with the heaviest falls confined to the warned districts. If it holds its strength for longer, the warnings could be revised, and residents should treat the November 2 to November 4 window as one to keep checking, rather than as a fixed forecast set in stone.
For now, the message from the Hyderabad centre is measured. Rain is coming, heavy showers are likely in nine districts on November 2, and the system is expected to weaken before it reaches Telangana. It is a forecast that calls for preparation, not alarm, and for attention to the next update as the system moves west-northwestwards towards the coast.
(Reporting based on The Hindu and Deccan Chronicle.)