ISLAMABAD — Provincial governments across the Indo-Gangetic plain extended emergency heat declarations into a second week on Wednesday as municipal water boards imposed rationing on more than 180 million residents and grid operators in three countries warned of rolling blackouts through the weekend, in what regional meteorological agencies described as the most severe pre-monsoon heat episode on record.

Daytime maximums at automated stations in Jacobabad, Sibi and Nawabshah remained above 49 degrees Celsius for a sixth consecutive day, while the Indian Meteorological Department recorded 47.8 degrees at Sri Ganganagar and 47.4 at Churu. Overnight minimums in much of Punjab and Sindh have not dropped below 33 degrees, a threshold the World Meteorological Organization has identified as a marker for elevated heat-related mortality among the elderly and those with cardiovascular conditions.

A senior official at the Pakistan Meteorological Department, briefing reporters in Islamabad, said the agency now expected the heat dome currently parked over the lower Indus to begin breaking down only after May 19, when an upper-level trough forecast to swing in from the Arabian Peninsula is expected to nudge the ridge eastward. The official, who was not authorized to be named, said the seasonal monsoon onset over Kerala was still being forecast for the first week of June, leaving roughly three weeks in which the most exposed populations would need to be carried through on emergency measures.

Municipal water utilities across Lahore, Karachi, Delhi and Jaipur have moved to two-hour rationing windows in the morning and evening, with tanker deliveries prioritized to hospitals, dialysis centers and informal settlements that have no piped supply. The Karachi Water and Sewerage Board, in a notification issued late Tuesday, said it had reduced the bulk allocation from the Hub Dam by 38 percent because reservoir levels had fallen below the agency’s hot-season minimum operating threshold for the first time since 2018.

In India, the central electricity authority reported peak load on Tuesday evening of 252 gigawatts, the highest pre-monsoon reading on record, with two state grids — Rajasthan and Uttar Pradesh — meeting demand only through emergency interconnect draws and a temporary suspension of scheduled maintenance on three thermal units. A senior load-dispatch engineer in New Delhi said that under current conditions the grid retained roughly a 4 percent reserve margin during evening peak, well below the 8 percent the agency considers a comfort threshold. “We are running everything we have, including units we would normally take offline for boiler inspection,” the engineer said.

Hospital systems in both countries have begun activating the emergency-mode protocols introduced after the 2024 and 2025 heat seasons. The Lady Reading Hospital in Peshawar said it had cleared elective procedures from its operating schedule and reassigned wards on the upper two floors to heat-stroke and dehydration cases. The All India Institute of Medical Sciences in Delhi reported a 41 percent increase in emergency-room admissions over the seven-day rolling average, with the steepest rise among outdoor workers and the over-65 population in unairconditioned housing.

Public health officials in Bangladesh, which is separately dealing with the displacement caused by Cyclone Amphan III’s landfall on May 10, have warned that the heat episode is now layering onto an already-stressed shelter and water-supply situation in the country’s southern districts. A Ministry of Disaster Management spokesperson in Dhaka said roughly 1.6 million people remained in temporary shelters along the coast and that the agency was attempting to procure additional oral rehydration salts and generator capacity for shelter sites that were being affected by heat as well as by the cyclone’s aftermath.

International responses have begun to take shape. The United Nations Office for the Coordination of Humanitarian Affairs activated its regional surge platform on Tuesday, releasing $14 million in pre-positioned funding for heat-related operations across South Asia. The European Civil Protection Mechanism dispatched two field teams to coordinate with Pakistani provincial authorities, and Japan announced an emergency loan facility through the Asian Development Bank for grid-stability operations.

Energy markets have begun to register the second-order effects. Liquefied natural gas spot prices for prompt delivery into Karachi rose to $13.10 per million British thermal units on Tuesday, the highest reading of the year, as state importer Pakistan LNG Limited issued an additional tender for two July cargoes. India’s NTPC has reportedly drawn down approximately 11 percent of its coal stockpile in the past nine days, prompting the railways ministry to extend the rake-priority order through the end of May.

A growing number of climatologists have argued that the structural pattern producing the current heat dome — a persistent ridge anchored over the western Arabian Sea combined with a slower-than-historical northward progression of the seasonal monsoon trough — is consistent with the trajectory that regional climate models began identifying in the early 2020s. A senior researcher at the Indian Institute of Tropical Meteorology, briefing analysts in Pune, said that recent heat episodes were no longer “outliers around a stable mean” but rather “the steepening tail of a distribution that is shifting.”

City governments have begun reaching for tools beyond rationing. Lahore, Faisalabad and Multan have ordered schools to remain closed through May 18, with state examinations postponed in two provinces. Delhi’s transport department converted three depots into evening cooling centers and ran an extended bus service to ferry residents of jhuggi-jhopri settlements to municipal halls overnight. Officials in Sindh said they were considering an emergency decree on outdoor labor that would prohibit construction work between 11 a.m. and 5 p.m. in seven districts.

A senior official at the South Asian Association for Regional Cooperation, asked whether the bloc would attempt a coordinated regional response, said the body’s environment secretariat had begun preparing an information-sharing framework but acknowledged that historical political frictions between member states had constrained operational coordination during past climate emergencies. “There is more room to move than there was five years ago, but the structures still lag the problem,” the official said.

Forecasters cautioned that the worst readings of the episode might yet be ahead. The Pakistan Meteorological Department’s extended outlook through the weekend showed Jacobabad and Sibi running above 50 degrees on Friday and Saturday, conditions that would push the broader Indus corridor into wet-bulb territory in which sustained outdoor work becomes physiologically dangerous. The Indian Meteorological Department issued red-category warnings for nine districts across Rajasthan and Haryana, advising residents to remain indoors during peak afternoon hours and to monitor older relatives for early signs of heat illness.

Relief is, in principle, on the way. The monsoon’s seasonal advance is one of the most reliable features of the regional climate, and pre-season forecasts from both Indian and Pakistani agencies continue to suggest a roughly on-time arrival. But the next three weeks — the gap between the breakdown of the current dome and the first significant rains — were, several officials acknowledged in private conversations Tuesday, the part of the calendar they were most worried about.