Tropical Storm Rafael

What is a tropical storm? a tropical depression?

A "tropical storm" usually refers to a tropical low pressure area whose winds have increased to at least 35 knots (about 40 mph) but less than 65 knots (about 75 mph, which then becomes "hurricane" strength).

A tropical storm goes through a "tropical depression" stage first, which has winds less than 35 knots, and a closed cyclonic circulation. Some tropical waves can be very strong, with peak winds of at least 35 knots, but if they do not have a closed cyclonic (circular) circulation, they are classified as a wave rather than a depression.

Even weaker systems are sometimes called a "tropical disturbance". These may be no more than a persistent area of showers and thunderstorms.
(page last updated 12/15/2019)
additional OPTIONS:
City, ST -or- ZIP code -or- ST
radar -or- snow -or- map
Copyright © 2023
Put our free WeatherStreet weather lookup on your web page.
Terms & Conditions