List of Unnamed Tropical Cyclones - Scope, Reasons, and Naming Overview

Scope, Reasons, and Naming Overview

In order to ease communications and advisories, tropical cyclones are named when, according to the appropriate Regional Specialized Meteorological Center or Tropical Cyclone Warning Center, it has reached tropical storm status. A tropical cyclone with winds of tropical storm intensity or higher goes unnamed when operationally, it is not considered to have met the criteria for naming. Reasons for this include:

• Post-operational upgrading. An example of this is the Unnamed tropical storm from the 1996 Pacific hurricane season.
• Being missed during a season, usually because of uncertainties in classification in real time. An example of this is the 2005 Azores Subtropical storm from the 2005 Atlantic hurricane season.
• Intentionally left unnamed to avoid confusion. An example of this is the 1991 Perfect Storm from the 1991 Atlantic hurricane season.
• Disagreements between warning centre and naming centres over intensity of a cyclone.