Chand Dev

Bay of Bengal Weather Update (13–16 Nov): What’s Really Happening with the "Twin" Circulations? 🌀🌧️ If you’ve been following my wind-stream animations over the last couple of days, you probably noticed what looked like two separate swirling systems east of Sri Lanka. A common question has been whether the western swirl would act like a magnet and drag the main system straight into Sri Lanka. Here is the full breakdown of what the latest model animation (Nov 13–16) and official meteorological bulletins show: 1. Not "Twins" — Just One Broad System Consolidating In early stages, a developing monsoon low often produces multiple localized eddies inside a single, broad cyclonic envelope. As seen in the 13–14 Nov frames, the weaker western spin center doesn't pull the stronger eastern low toward Sri Lanka. On the contrary, by 15 Nov, the two circulations fully merge into one dominant, well-organized core, followed by a significant intensification. 2. Official Intensification Timeline (IMD) 13–14 Nov: The low-pressure area over the southeast Bay of Bengal consolidates into a well-marked low-pressure area. 15 Nov (Morning): Expected to officially concentrate into a Depression over the central and adjoining south Bay of Bengal as the merger completes. 16 Nov (Evening): Forecast to intensify further into a Cyclonic Storm over the central Bay of Bengal (visible as the tight, high-wind green/yellow core in the final frames). 3. Projected Track & Steering Rather than being dragged westward into Sri Lanka, subtropical steering winds are guiding the consolidated system north-northwestwards into the central Bay of Bengal, keeping the storm's center offshore to the northeast of the island. 4. What This Means for Sri Lanka & Surrounding Coasts: Even without a direct landfall, the broad outer wind field and rainbands still bring significant weather impacts: Heavy Rainfall: Expect spells of heavy rain across parts of northern, eastern, and central Sri Lanka starting 15 Nov as outer bands sweep across the island. Rough Seas & Wind: Sri Lanka's Department of Meteorology has issued warnings for naval and fishing communities off the northern and eastern coasts (from Kankesanthurai to Hambantota via Trincomalee and Pottuvil) starting 14 Nov due to squally winds and rough seas. Stay safe, keep an eye on official updates from the IMD and Sri Lanka Met Department, and drop any questions below! 👇