Kaileigh

I'm trying to put the formation of a tropical cyclone in order, but I'm a bit confused on these two terms. In the formation of a tropical cyclone, which would come first a disturbance or a invest? I define a tropical disturbance as a weather system with organized convection originating from the tropics that has a non-frontal migratory characteristic and maintains its identity for at least 24 hours. Then I define invest as an investigative area of weather (that has the potential to form into a tropical cyclone) that a forecast center collects data on and is labeled 90-99, with a corresponding letter for each ocean basin. The order I have currently is: Tropical Wave (Easterly Wave) Tropical Disturbance Tropical Depression Tropical Storm Subtropical Storm Extratropical Storm (Mid-Latitude Cyclones or Wave Cyclones) Hurricane Category 1 (Minimal) Hurricane Category 2 (Moderate) Hurricane Category 3 (Extensive) Major Hurricane Category 4 (Extreme) Major Hurricane Category 5 (Catastrophic)