IMD Issues Heavy Rain Alert for Bengal as Monsoon Intensifies

Anirudh Jain - Kolkata Bureau Jul 18, 2026 1,500 Views

West Bengal faces a severe weather alert as the IMD forecasts extremely heavy rainfall for northern districts through July 19. Southern regions will experience widespread thundershowers and gusty winds. The state remains under high alert due to a low-pressure system, with potential risks of flooding and landslides across North Bengal.

Meteorological authorities have issued warnings for widespread rainfall across West Bengal, with North Bengal facing an "extremely heavy" rain alert through Monday.

KOLKATA — The India Meteorological Department (IMD) has issued high-alert weather warnings for West Bengal as an active monsoon system continues to bring intense rainfall across the state. As of July 18, 2026, the northern districts are under an advisory for extremely heavy precipitation, while southern regions are expected to witness persistent showers and thunderstorm activity.

North Bengal Under ‘Extremely Heavy’ Rainfall Alert

The IMD has issued a severe weather warning for Sub-Himalayan West Bengal and Sikkim, with the most intense activity concentrated on July 18 and July 19. According to the latest bulletin, North Bengal districts, particularly Jalpaiguri and Alipurduar, are likely to receive "extremely heavy" rainfall exceeding 20 cm at isolated locations.

Other districts in the northern belt, including Darjeeling, Kalimpong, and Coochbehar, are expected to experience heavy to very heavy rainfall (7–20 cm) throughout the weekend. The weather department has advised residents to exercise extreme caution, noting the risks of landslides in hilly terrains and waterlogging in low-lying areas.

Monsoon Forecast for South Bengal

In Gangetic West Bengal, the meteorological conditions remain unsettled due to a low-pressure system lingering over the region. While the intensity of rainfall in the southern districts is not expected to reach the extreme levels forecast for the north, authorities have warned of widespread rain and thundershowers.

Districts such as East Midnapore, West Midnapore, and South 24 Parganas are likely to experience gusty winds reaching speeds of 30–40 kmph, accompanied by lightning strikes. The IMD has urged commuters and residents in South Bengal to take shelter during peak storm activity and avoid contact with water bodies or unsecured electrical structures.

Why It Matters

The sustained heavy rainfall presents significant challenges for regional infrastructure, agriculture, and public safety. In North Bengal, the combination of extremely heavy rain and potential landslides poses a risk to transportation and rural connectivity. For South Bengal, the primary concerns include damage to standing horticultural crops and the risk of lightning in open fields. Authorities have cautioned that traffic movement may be regulated as a precautionary measure in flood-prone areas.

Key Facts at a Glance

Northern Warning: Extremely heavy rainfall (>20 cm) expected in Jalpaiguri and Alipurduar districts on July 18–19.
Systemic Cause: A low-pressure area over Gangetic West Bengal and adjoining regions is driving the current monsoon intensity.
Southern Conditions: Persistent rain and thunderstorms expected across South Bengal, with gusty winds up to 40 kmph.
Duration: High-intensity rainfall warnings for North Bengal extend through Monday, with general monsoon activity predicted to persist statewide until at least July 22.

FAQ

1. What does the "extremely heavy" rain warning mean for residents?

It indicates rainfall exceeding 20 cm within 24 hours, which can cause flash flooding, landslides in hilly areas, and severe waterlogging.

2. Are coastal areas affected by the weather system?

Yes, fishermen have been advised against venturing into the sea along the West Bengal and North Odisha coasts due to squally winds.

3. When will the weather improve?

While extreme rainfall is expected to taper off after July 20, the IMD predicts rainfall activity to continue in various parts of the state through July 22.

4. What safety measures should be taken during the storm?

Authorities recommend taking shelter in secure structures during lightning or heavy rain, avoiding trees and electric poles, and monitoring local traffic advisories.

Official Sources and Meteorological Data

According to the IMD’s regional center in Kolkata, the current weather pattern is driven by a low-pressure area that previously hovered over the Northwest Bay of Bengal and adjoining coastal regions. While this system is expected to weaken gradually, its influence will maintain significant moisture influx and rainfall across the state through at least July 22, 2026.