Andhra Pradesh

Andhra Pradesh's coast runs roughly 975 kilometres along the Bay of Bengal from the Odisha border in the north down to the Krishna-Godavari delta and south to the Tamil Nadu line — one of the longest state coastlines in India and one of the most exposure-heavy. The Bay of Bengal is a semi-enclosed arm of the Indian Ocean, and its northern end is a meteorological trap: warm shallow water, a funnel geometry that concentrates cyclone-generated storm surge, and a monsoon circulation that drives sustained swell from the northeast between October and December. The tidal regime along this coast is semidiurnal, with a mean spring range of approximately 1.0 to 1.5 m — modest by global standards. What makes Andhra Pradesh's coastal hydrology demanding is not the astronomical tide but the storm surge sitting on top of it. Severe cyclones crossing this coast — and they come at a statistical rate of one to two significant systems per year — can drive surge of 3 to 5 m above predicted tide levels, a figure that dwarfs the background tidal range. Planning around tide times here is inseparable from planning around cyclone risk during the active season, roughly May to June and September to December. Visakhapatnam, known locally as Vizag, anchors the northern stretch of the coast and functions as the region's primary port city. Its position against the Eastern Ghats and the deep offshore trench known as the Visakhapatnam Canyon gives it a different coastal character than the flat deltaic coastline further south — the canyon influences wave propagation into the bay, steepening nearshore swells. The India Meteorological Department (IMD) operates the authoritative forecast and warning system for this coast; the National Centre for Coastal Research (NCCR) publishes tide tables and observational data for Andhra Pradesh gauge stations. Open-Meteo Marine predictions for this region are model-derived, accurate typically within plus or minus 45 minutes on timing and 0.2 to 0.3 m on height under normal conditions — storm surge is a separate physical process not captured in these predictions.