These forecasts provide advance notice of potentially dangerous surge currents within harbors. Click on a location for a plot of observed and predicted surge current indices. These forecasts can alert locations up to six days in advance if the surge current will be at or above a pre-determined threshold of extreme activity (red line). When this threshold is exceeded, damage to boats and infrastructure may occur due to the jostling of boats and floating docks, and safe navigation becomes problematic.
caution: These forecasts are experimental and no promise of accuracy is implied; especially, the forecast is explicitly not accurate when either a tsunami, tropical storm, or hurricane warning is in effect. In these latter cases, see either tsunamis or tropical storms/hurricanes.