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thunderstorm

American  
[thuhn-der-stawrm] / ˈθʌn dərˌstɔrm /

noun

  1. a transient storm of lightning and thunder, usually with rain and gusty winds, sometimes with hail or snow, produced by cumulonimbus clouds.

thunderstorm British  
/ ˈθʌndəˌstɔːm /

noun

  1. a storm caused by strong rising air currents and characterized by thunder and lightning and usually heavy rain or hail

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
thunderstorm Scientific  
/ thŭn′dər-stôrm′ /

  1. A storm of heavy rain accompanied by lightning, thunder, wind, and sometimes hail. Thunderstorms occur when moist air near the ground becomes heated, especially in the summer, and rises, forming cumulonimbus clouds that produce precipitation. Electrical charges accumulate at the bases of the clouds until lightning is discharged. Air in the path of the lightning expands as a result of being heated, causing thunder. Thunderstorms can also be caused by temperature changes triggered by volcanic eruptions and forest fires, and they occur with much greater frequency at the equatorial regions than in polar regions.

Etymology

Origin of thunderstorm

First recorded in 1645–55; thunder + storm

Vocabulary lists containing thunderstorm

Physical Geography - Introductory

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Physical Geography - Middle School

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Earth Science - Middle School

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Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

In August 2025, a Crew-11 launch was scrubbed at T-minus 1 minute due to cloud cover and a small thunderstorm near Cape Canaveral violating weather safety criteria.

From BBC • Mar. 30, 2026

Another bushfire near the small town of Walwa crackled with lightning as it radiated enough heat to form a localised thunderstorm.

From Barron's • Jan. 11, 2026

In some ways, we can do just that — even if it’s not quite as fun as watching Ted Sarandos wander around in a thunderstorm.

From Salon • Jan. 4, 2026

Then one night a thunderstorm swept it and the beavers downstream.

From The Wall Street Journal • Nov. 7, 2025

There was a dangerous edge to his voice, like a thunderstorm about to erupt.

From "The Last Olympian" by Rick Riordan

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.