June 1 marked the start of typhoon season, the six-month duration in which strong storms form in warm tropical waters.

At the start of each typhoon season, scientists make forecasts about the number of serious storms the United States is most likely see and how strong they may be. This year is anticipated to be relatively regular, with 4 to 8 typhoons (specified as a storm with wind speeds of of 74 miles per hour or greater), 2 to 4 of which might be classification 3 or above (implying wind speeds of a minimum of 111 miles per hour).

Ideally, none of these will be on par with the most harmful storms in United States history. Here’s what to understand about the 6 most dangerous typhoons the nation has actually ever experienced.