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Tropical Storm Basics: A Quick Reference Guide

June 17, 2026 · The Clime Team
Tropical Storm Basics: A Quick Reference Guide

Tropical storms are powerful weather systems that can cause significant damage. Understanding their characteristics and classifications is crucial for preparedness.

What Are Tropical Storms?

Tropical storms are organized systems of clouds and thunderstorms that originate over tropical or subtropical waters. They are characterized by a defined circulation and maximum sustained winds ranging from 39 to 73 mph (63 to 118 km/h). These storms can lead to heavy rainfall, strong winds, and other hazardous conditions. (emergency.fsu.edu)

How Do Tropical Storms Form?

Tropical storms develop over warm ocean waters, typically when sea surface temperatures are at least 78°F (26°C). Warm, moist air rises from the ocean surface, creating a low-pressure area. As this air rises and cools, it forms clouds and thunderstorms. If the system becomes organized with a defined circulation, it can develop into a tropical storm. (spaceplace.nasa.gov)

Classification of Tropical Cyclones

Tropical cyclones are classified based on their maximum sustained wind speeds:

  • Tropical Depression: Winds up to 38 mph (62 km/h).

  • Tropical Storm: Winds between 39 and 73 mph (63 to 118 km/h).

  • Hurricane: Winds exceeding 74 mph (119 km/h).

In the Atlantic and eastern Pacific, storms with winds over 74 mph are called hurricanes. In the western Pacific, they are known as typhoons. (wmo.int)

The Saffir-Simpson Hurricane Wind Scale

This scale categorizes hurricanes based on their wind speeds and potential damage:

  • Category 1: 74-95 mph (119-153 km/h) – Minimal damage.

  • Category 2: 96-110 mph (154-177 km/h) – Extensive damage.

  • Category 3: 111-129 mph (178-208 km/h) – Devastating damage.

  • Category 4: 130-156 mph (209-251 km/h) – Catastrophic damage.

  • Category 5: 157 mph (252 km/h) or higher – Catastrophic damage.

Understanding these categories helps in assessing potential impacts and preparing accordingly. (emergency.fsu.edu)

Safety Measures During a Tropical Storm

  • Stay Informed: Monitor weather updates from reliable sources.

  • Prepare an Emergency Kit: Include essentials like water, non-perishable food, medications, and important documents.

  • Create an Evacuation Plan: Know multiple routes to safe locations.

  • Secure Your Home: Install storm shutters or board up windows, and secure outdoor objects.

  • Follow Official Instructions: Adhere to evacuation orders and safety guidelines from authorities.

Being prepared and informed can significantly reduce the risks associated with tropical storms.

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Frequently Asked Questions