A hurricane will start as a Tropical Wave. It then becomes a Tropical Depression. A TD is given a number but not a name. Once the TD reaches 39 mile per hour winds its given a name and becomes a Tropical Storm. After reaching 74 mile per hour winds it becomes a hurricane.
A tropical storm becomes a hurricane when its sustained winds reach or exceed 74 mph (119 km/h). This increase in wind speed marks the transition from a tropical storm to a hurricane on the Saffir-Simpson Hurricane Wind Scale.
A tropical storm becomes a hurricane when sustained winds reach 74 mph or more.
A tropical depression is a weak tropical cyclone wind sustained winds of less than 39 miles per hour. As the depression is fueled by moisture from warm ocean water it gains strength and becomes more organized. When wind speeds reach 39 mph it becomes a tropical storm. When they reach 74 mph it becomes a hurricane.
A tropical disturbance can become a tropical depression, which can then lead to a tropical storm and on to a tropical cyclone, or hurricane. (The differentiation between a cyclone and hurricane depends on the strength and location -- it becomes a hurricane when it hits land and exceeds wind speeds of over 74 miles per hour)
A storm doesn't have to be a hurricane to be named. A system is named as soon as it becomes a tropical or subtropical storm. About half of all tropical storms become hurricanes.
Before a storm becomes a hurricane it is called a tropical storm. Prior to that it is either a tropical depression or a tropical disturbance.
A tropical cyclone officially becomes a hurricane when sustained winds reach 74 mph (119 km/h)
No. There are two criteria for a storm to be considered a hurricane. It must by a tropical and the maximum sustained winds must be at least 74 mph. Many storms in the Atlantic are either extratropical or subtropical and may that are tropical never attain winds of 74 mph.
A tropical storm becomes a hurricane when suatined winds reach 74 mph (119km/h).
A tropical storm becomes a hurricane when sustained winds reach 74 mph
Tropical storms become hurricanes when sustained wind speeds reach or exceed 74 mph (119 km/h). Additionally, warm ocean waters, low wind shear, and high humidity are factors that contribute to the development and strengthening of hurricanes.