Coastal water rise, surge forecasts, tide gauges, and inundation warnings
This storm surge monitor tracks coastal water-rise threats from active tropical cyclones, extratropical storms, and severe weather systems. Users searching for storm surge near me, surge forecast, or coastal flood warning can see active surge predictions, tide gauge anomalies, and inundation risk maps.
Storm surge is the abnormal rise of seawater above predicted tide levels driven primarily by wind stress pushing water against the coast and, secondarily, by the low atmospheric pressure of the storm itself. The shape of the coastline matters enormously — shallow continental shelves and concave bays amplify surge dramatically. Hurricane Katrina (2005) produced surge over 8 metres along parts of the Mississippi coast; Cyclone Bhola (1970) produced surge over 10 metres in the Bay of Bengal, killing hundreds of thousands.
Storm tide combines storm surge with astronomical tide — surge arriving at high tide produces the most extreme coastal water levels. Wave heights ride on top of the storm tide and produce additional damaging splash, runup, and overtopping. The Saffir-Simpson scale categorizes hurricanes by wind speed alone, but surge potential depends as much on storm size, forward speed, and coastal bathymetry as on intensity, so even Category 1–2 storms can produce devastating surge in vulnerable coastlines.
Coastal regions exposed to tropical cyclones maintain evacuation zone maps based on surge modeling for different storm categories. Mandatory evacuations are typically issued 24–48 hours before expected landfall, when forecast confidence allows time for orderly movement. The greatest loss of life from tropical cyclones globally has been from surge inundation rather than wind damage. Vertical evacuation to upper floors in surge-resistant structures may be safer than horizontal evacuation when storms move quickly.
Numerical surge models — SLOSH in the US, NEMO and FORTE in Europe — couple atmospheric forcing with ocean dynamics and detailed coastal bathymetry to forecast surge heights several days ahead. Probabilistic surge products combine ensembles of track forecasts with surge model runs to quantify uncertainty. Improvements in model resolution, real-time tide gauge assimilation, and storm forecast accuracy have significantly reduced surge forecast errors over recent decades.
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