Storm surge is the deadliest part of any tropical system. So, what is it, and what should you know? It's defined as the abnormal rise of water over and above the predicted tides. The rise in water level can cause extreme flooding, according to the National Weather Service. Read more: https://www.wtsp.com/article/news/local/what-you-should-know-storm-surge-tampa-bay/67-af87c2ba-5083-482f-be4f-cc4dae475e67