sentence: Tropical cyclones can sometimes degenerate back into a tropical wave.
sentences_after: This normally happens if upper-level wind shear is too strong. The storm can redevelop if the upper level shear decreases or stops. If a tropical wave is moving quickly, it can have strong winds of over tropical storm force, but is not considered a tropical storm unless it has a closed circulation.
concept_name: tropical cyclone
headings: Tropical wave Atlantic
categories: Weather