IMD Weather Update: Thunderstorm and Rain Alerts Issued for South India as Severe Heatwave Strikes the West

Now the Indian subcontinent is witnessing an extraordinary atmospheric split. The pre-monsoon activity is gaining significant momentum across the nation, as varied weather systems collide simultaneously. Therefore, the Indian Meteorological Department (IMD) has issued heavy rain alerts for Tamil Nadu and the Andaman & Nicobar Islands due to a strengthening depression in the Bay of Bengal. Meanwhile, the western belt of India—including Gujarat, Rajasthan, and Vidarbha—is currently being scorched by a “severe heatwave.” Following the latest satellite imagery, conditions are also becoming increasingly favorable for an early onset of the Southwest Monsoon 2026.

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Bay of Bengal Depression: Strengthening Alerts for Tamil Nadu

Now the primary driver for rainfall activity in the South is a strengthening depression located in the Bay of Bengal and Northern Sri Lanka. This cyclonic disturbance, which extends up to 5.8 km above mean sea level, is moving northwards. Therefore, the system is expected to strengthen further within the next 48 hours, causing widespread precipitation.

First, heavy rains have already been observed in parts of South Tamil Nadu and the Andaman & Nicobar Islands. Next, the meteorological department warns that these rains will be accompanied by strong winds and thunderstorms. Thus, maritime activities in the region have been strictly regulated to avoid accidents.

So the Andaman region is likely to see continuous rainfall for the rest of today. Meanwhile, the moisture from this depression is also feeding into parts of Kerala and Karnataka. Therefore, the southern peninsula is currently the focal point for pre-monsoon showers.

The West is Burning: Surviving the 2026 Severe Heatwave

Now while one end of the country is cooling down, the other end is struggling with an intense summer season. Excessive heat continues to plague Gujarat, Rajasthan, and the Vidarbha regions. Therefore, several districts in these states are officially experiencing a “severe heatwave” status.

First, temperature levels have remained extremely high, creating an uncomfortable and hazardous atmosphere for residents. Next, the lack of cloud cover and persistent hot winds are exacerbating the daytime highs. Thus, local administrations have issued health advisories to prevent heatstroke and dehydration.

So the western belt is currently seeing no immediate relief from this scorching heat. Meanwhile, the power demand in these states has reached a seasonal peak as cooling requirements soar. Therefore, the “severe” classification marks this as one of the most intense heat events of the 2026 season.

Regional Systems: Cyclonic Circulations and Cloudy Skies

Now beyond the major depression and heatwave, several local weather systems are active across the nation. An active cyclonic circulation is prevailing over western Rajasthan and neighboring areas. Therefore, even within the heatwave zone, some dust storms or localized wind activity may occur.

First, central and eastern systems are affecting Madhya Pradesh, Chhattisgarh, and Jharkhand. Next, these systems are leading to cloudy conditions and occasional light rain, providing a minor reprieve from the sun. Thus, the weather in Central India remains volatile and subject to sudden changes.

So the hill regions of Jammu & Kashmir, Himachal Pradesh, and Uttarakhand continue to receive isolated rain. Meanwhile, these thunderstorms are keeping the higher altitudes relatively cool. Therefore, the regional diversity of India’s weather is on full display this Wednesday.

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Rainfall Records: From Northeast Deluges to North India Showers

Now the rainfall distribution over the past 24 hours has been varied across different states. Heavy rainfalls have already drenched Assam, Meghalaya, and Arunachal Pradesh in the Northeast. Therefore, the pre-monsoon season in the hills is already in high gear.

Recent Rainfall Summary:

• South: Tamil Nadu and Andaman (Heavy); Kerala and Karnataka (Light to Moderate).

• East: Bihar, Jharkhand, and West Bengal (Thunderstorms prevailing).

• North: Punjab, Haryana, and Western UP (Isolated light showers).

• Northeast: Heavy falls in the “Seven Sisters” region.

First, Skymet predicts that rainfall will continue to occur in the Andaman region for at least another day. Next, the presence of thunderstorms in Eastern India is expected to move northward. Thus, moisture levels are increasing across the Gangetic plains.

Pre-Monsoon Momentum: Why the 5.8 km Disturbance Matters

Now the strengthening of the cyclonic disturbance up to 5.8 km above mean sea level is a significant meteorological event. Such deep systems are capable of pulling in vast amounts of moisture from the ocean. Therefore, the “momentum” mentioned by the IMD suggests a high-energy transition into the monsoon phase.

First, this system is helping to dissipate the dry, hot air over the eastern part of the country. Next, the intensification over the next 48 hours will likely determine the path of early monsoon winds. Thus, the mechanical necessity for this system to move northwards is critical for the overall rainfall distribution.

So the interaction between the hot western winds and the cool southern moisture is creating a line of instability across Central India. Meanwhile, this “clash of systems” is what triggers the classic pre-monsoon thunderstorms. Therefore, the nation is currently in the middle of a major atmospheric reorganization.

Delhi-NCR Outlook: Will the Capital Get Relief from the Heat?

Now the national capital is also feeling the effects of these shifting systems. While Delhi has been hot, light showers have been sighted in isolated areas. Therefore, the “Coming Soon” relief for Delhi-NCR depends on the moisture reaching from the Rajasthan cyclonic circulation.

First, Punjab and Haryana are also expected to see light rainfall, which could cool the winds heading toward Delhi. Next, the cloudy conditions are helping to keep the peak afternoon temperatures slightly lower than last week. Thus, while not a full respite, the intensity of the heat in the capital is being dampened.

So the city remains on alert for “thunderstorm activity” during the late evening hours. Meanwhile, the dust levels remain a concern given the dry conditions in Western India. Therefore, the capital’s weather remains a mix of hazy sun and localized cloud cover.

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Monsoon 2026 Forecast: Early Movement and Favorable Conditions

Now the long-term outlook for the 2026 season is turning optimistic. According to the IMD, conditions are becoming increasingly favorable for the arrival of the Southwest Monsoon. Therefore, the current low-pressure formation in the Bay of Bengal is being viewed as a “helper” system.

First, the depression is aiding in the early movement of monsoon activity into the southern region. Next, the sea surface temperatures are within the range that supports a healthy monsoon onset. Thus, farmers and policymakers are closely watching these developments for the Kharif sowing season.

So the arrival in the Andaman Sea is expected to be on or slightly before the scheduled date. Meanwhile, the progress into the mainland will be monitored following the 48-hour intensification of the current depression. Therefore, Monsoon 2026 appears to be gathering the necessary energy for a strong start.

FAQ: Frequently Asked Questions on the IMD May Update

1. Where is the heavy rain alert issued for today? Now, the IMD has issued heavy rain alerts primarily for South Tamil Nadu and the Andaman & Nicobar Islands.

2. Which states are currently under a “severe heatwave”? First, Gujarat, Rajasthan, and the Vidarbha region of Maharashtra are experiencing severe heatwave conditions.

3. Is the Southwest Monsoon 2026 expected to arrive early? So yes, conditions are becoming favorable for an early movement, aided by the low-pressure system in the Bay of Bengal.

4. What is causing the rain in North and Central India? Next, active cyclonic circulations over Rajasthan and systems near Madhya Pradesh are causing cloudy conditions and light rain.

5. How high is the cyclonic disturbance in the Bay of Bengal? Now, the current disturbance extends up to 5.8 km above the mean sea level, signaling a strong and strengthening system.

6. Will Delhi get any rain this week? Finally, the IMD predicts light showers may be seen in isolated parts of Delhi, Punjab, and Haryana over the next 24 hours.

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