Occur usually when river rises above the banks. May be due to rain or snow/ice.
Heavy rain that may be blowing from the ocean!
An unusual rise in water level in coastal areas, over and above the regular astronomical tide. This can be cause by wind, waves or even a low pressure in the atmosphere.
This happens when precipitation accumulates for days and days and then it rains hard, fast and strong for a short period of time. Generally caused by snow and ice.
Heavy amounts of rain fall in a very short amount of time.
Stay safe and warm