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Low Pressure Area Over Bihar And Jharkhand, Very Heavy Rains Likely Over Gangetic West Bengal, Sikkim, Sub Himalayan West Bengal

October 4, 2023 2:11 PM |

Yesterday’s low pressure area moved slowly and still persists over Jharkhand and Bihar regions. Cyclonic circulation of the system actively covers the eastern and northeastern sectors covering West Bengal, Sikkim and Sub Himalayan West Bengal. Mountainous terrain has added to the degree of difficulty modifying weather patterns. Heavy to very heavy rains have lashed Sikkim and Sub Himalayan West Bengal in the past 24 hours. Incessant rains in the catchment areas have raised the flow of water bodies across the region.

The retreating phase of the monsoon typically spells heavy downpours over Northeast Bihar, Sikkim and Sub Himalayan West Bengal. As such, these are the rainiest parts even during the core months of the southwest monsoon season.  Remnant of the low-pressure area as cyclonic circulation is expected to hang around the region for the next 48 hours. Extremely heavy rains are likely over east and north Sikkim and West Bengal bordering Sikkim and Bhutan. 

Locations at risk include Gangtok, Pakyong, Pelling, Yumthang, Mangan, Lachung, Chungthang, Kurseong, Kalimpong, Darjeeling, Hasimara, Jalpaiguri, Siliguri, Cooch Bihar, Alipurduar and Binaguri.  Powerful thunderstorms with lightning strikes and strong winds are likely over these parts over the next 2 days. Severe activity mostly occurs during late hours in the night and early morning hours.

The low-pressure area will move northeastward across north Bengal, Bangladesh and Lower Assam. This region will witness inclement weather conditions lasting till 07th October. Later, low pressure is expected to weaken and become diffused over the same area. Light rainfall with few moderate showers will continue between 08th and 12th October. Large clearance is expected after 13th October over east and northeast India.

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