The Fujiwhara effect is named after a Japanese meteorologist who identified a phenomenon that happens when two cyclonic vortices or low-pressure systems nearby move around each other, sometimes merging.

The Fujiwhara effect occurs when two cyclones, low-pressure systems, move around a common center, appearing as if they are dancing together. If it happens, you can use the WindRadar to see it. Check out the video below to see the Fujiwhara effect come into play offshore of the Northwest coast.

In the tropics, this phenomenon tends to occur more frequently in the Pacific than in the Atlantic, due to the higher frequency and number of storms that develop. Typically, two systems must be within 900 miles of each other for the Fujiwhara effect to occur or have a possibility of happening.

Size, proximity, intensity, and atmospheric conditions matter. It is essential to know that when two storms start orbiting each other, one can absorb the other, and they could merge. They don't create a super storm; they just get absorbed. However, this effect can bring changes in tracks and an intensity change.

A track change could mean that people who were perhaps not initially at risk of impact may become at risk after the merge, given little time to prepare. It is crucial to stay informed and up-to-date with the latest weather forecast.