CHICOPEE, Mass. (WWLP) – With all this talk about Hermine over the last couple of weeks, tropical terminology can sometimes be confusing.
In recent days, you may have heard us refer to Hermine as a “post-tropical cyclone” and not a hurricane or a tropical storm anymore. Here is why: a cyclone is a storm system in the northern hemisphere that spins counter-clockwise. Tropical storms and hurricanes are types of cyclones, and so are much weaker storm system.
The term “post-tropical” means that the storm was a tropical system in the past, but it now lacks tropical characteristics. A tropical system has a warm core, a post tropical system does not anymore, but it can still have strong winds.
A tropical depression is a tropical system with organized thunderstorms and circulation of winds less than 38 miles per hour. A tropical storm has organized strong thunderstorms and circulation winds of 39 to 73 miles per hour, while a hurricane has intense organized tropical thunderstorms with very strong circulation winds of 74 MPH or higher.