West Bengal Weather Update: Cyclonic Circulation Triggers Heavy Rainfall and Thunderstorm Alerts Across the State

The Alipore Meteorological Department has issued a significant weather warning for the state of West Bengal, as a powerful cyclonic circulation continues to influence atmospheric conditions over the region. According to the latest bulletins, at least five districts in South Bengal are bracing for heavy to very heavy downpours, while North Bengal remains under a 'disaster alert' with predictions of thunderstorms, lightning, and gusty winds. This sudden shift in weather patterns has raised concerns regarding urban logging, agricultural damage, and potential disruptions to transport services.

South Bengal: Five Districts on High Alert

The primary focus of the weather office's warning is on the southern part of the state, where a cyclonic circulation has intensified. Meteorologists have identified that moisture-laden winds from the Bay of Bengal are surging into the mainland, creating unstable atmospheric conditions. The districts expected to receive the heaviest rainfall include South 24 Parganas, North 24 Parganas, Purba Medinipur, Paschim Medinipur, and Jhargram. In these areas, the rainfall intensity is expected to range from 70mm to 110mm within a 24-hour period.

Residents in these districts have been advised to exercise caution. The IMD (India Meteorological Department) has warned that the heavy rain could lead to a temporary rise in water levels in local rivulets and cause waterlogging in low-lying areas. For the agricultural sector, specifically paddy and vegetable farmers, this sudden deluge could be problematic if proper drainage is not maintained. The Alipore office also noted that while these five districts will bear the brunt of the rain, other parts of South Bengal, including Kolkata, Howrah, and Hooghly, will experience intermittent light to moderate showers accompanied by overcast skies.

North Bengal: A Dual Threat of Rain and Wind

While South Bengal deals with the rain, North Bengal is facing a more volatile combination of weather elements. The sub-Himalayan districts, including Darjeeling, Kalimpong, Jalpaiguri, Alipurduar, and Cooch Behar, are currently in the crosshairs of a weather system that is bringing not just rain, but also significant lightning activity and gusty winds. The wind speeds are expected to reach 30-40 km/h in certain pockets, which could pose a risk to temporary structures and tea plantations.

The threat of landslides remains a critical concern in the hilly terrains of Darjeeling and Kalimpong. Continuous rainfall over the past few days has already saturated the soil, and the predicted 'disaster-like' conditions could further destabilize slopes. Travelers and tourists have been advised to monitor local news before planning mountain commutes. Furthermore, the Alipurduar and Cooch Behar regions are likely to see localized flooding as the Teesta, Torsa, and Jaldhaka rivers are showing a rising trend in water levels.

Kolkata Weather: Humidity and Intermittent Showers

For the state capital, Kolkata, the weather remains stiflingly humid despite the rain clouds. The maximum temperature is expected to hover around 32-33 degrees Celsius, but the high moisture content will make the 'real feel' temperature significantly higher. While Kolkata is not currently on the 'heavy rain' list, the city is expected to see several spells of thundershowers throughout the day. The Alipore Weather Office has indicated that the sky will remain mostly cloudy, providing some relief from the direct sun, though the discomfort index remains high.

The Science Behind the Surge: Understanding the Cyclonic Circulation

Meteorologists explain that the current weather activity is driven by a cyclonic circulation located over the North Bay of Bengal and its neighborhood. This system acts as a vacuum, drawing in moisture from the sea. When this moisture hits the landmass and interacts with the heat, it leads to the formation of tall cumulonimbus clouds, which are responsible for the heavy rain and lightning being witnessed today. Additionally, a trough line extending from the northern plains toward the Bay of Bengal is further destabilizing the air across West Bengal.

Climate experts suggest that these localized circulations are becoming more frequent and intense due to rising sea surface temperatures in the Bay of Bengal. This trend often leads to unpredictable weather patterns where some districts receive excessive rain while others remain relatively dry, a phenomenon that has been observed throughout this monsoon season.

Impact on Infrastructure and Safety Recommendations

The state government and local administrations have been put on standby. In the coastal districts of South 24 Parganas and Purba Medinipur, fishermen have been advised not to venture deep into the sea due to choppy waters and high wind speeds. In urban areas, municipal corporations are clearing drainage systems to prevent the kind of chronic waterlogging that often paralyzes cities like Kolkata and Siliguri.

The IMD has issued several safety guidelines for the public during this period: 1. Stay indoors during thunderstorms to avoid lightning strikes. 2. Avoid taking shelter under trees or near electric poles. 3. Farmers are advised to postpone the application of fertilizers and pesticides during heavy rain. 4. Residents in the hills should stay away from areas prone to landslides and avoid crossing mountain streams that may experience flash floods.

Looking Ahead: The Weekly Forecast

The influence of this cyclonic circulation is expected to persist for the next 48 to 72 hours. While the intensity of the rain might decrease slightly after Thursday, the moisture levels will remain high, leading to scattered rainfall throughout the weekend. North Bengal, in particular, may see a prolonged period of wet weather as the monsoon trough remains positioned close to the foothills of the Himalayas. For South Bengal, a gradual improvement in weather is expected by the end of the week, although localized thundershowers will remain a daily feature.

As the state navigates this period of atmospheric instability, the Alipore Weather Office continues to provide real-time updates via its digital platforms. Citizens are encouraged to stay informed and prioritize safety during this period of heavy rain and stormy conditions.