A chubasco is a violent squall with thunder and lightning, encountered during the rainy season along the Pacific coast of Mexico

Mexico

The United Mexican States , commonly known as Mexico , is a federal constitutional republic in North America. It is bordered on the north by the United States; on the south and west by the Pacific Ocean; on the southeast by Guatemala, Belize, and the Caribbean Sea; and on the east by the Gulf of...

, Central America

Central America

Central America is the central geographic region of the Americas. It is the southernmost, isthmian portion of the North American continent, which connects with South America on the southeast. When considered part of the unified continental model, it is considered a subcontinent...

, South America

South America

South America is a continent situated in the Western Hemisphere, mostly in the Southern Hemisphere, with a relatively small portion in the Northern Hemisphere. The continent is also considered a subcontinent of the Americas. It is bordered on the west by the Pacific Ocean and on the north and east...

 and the American Southwest. It is also widely used when rain is accompanied by strong winds in other Spanish-speaking countries.
The word chubasco has its origins in the Portuguese word "chuva" which means rain. The "Monsoon" storms that regularly pass over the southwestern United States, including the Southern regions of Arizona and New Mexico, are technically Chubascos.
Source: http://ggweather.com/winds.html