US EditionFujiwhara Effect: What is it, what happens? Will Invest 94L and Tropical Storm Humberto combine?
Tropical Storm Humberto could strengthen to a major hurricane while possibly interacting with a developing storm via the rare Fujiwhara effect, NOAA says.
- On September 25, 2025, Tropical Storm Humberto and Invest 94 were close in the tropical Atlantic near the Caribbean, raising monitoring concerns.
- Their proximity, combined with expected strengthening, has led forecasters to consider the rare Fujiwhara effect, where two storms rotate around a common center.
- Experts said the Fujiwhara effect complicates forecasts because storms can dance around each other, slightly altering their paths or potentially merging, though merging is unlikely.
- Humberto, with winds reaching 50 mph, is expected to strengthen into a hurricane soon, while Invest 94 is anticipated to develop into Tropical Storm Imelda and may affect the U.S. Southeast Coast.
- This situation reduces forecast accuracy, prompting vigilance for coastal areas, though Humberto is predicted to avoid landfall and the interaction's final outcome remains uncertain.
29 Articles
29 Articles
Tropical Cyclones Could Potentially Collide In The Atlantic Ocean
Two tropical cyclones in the Atlantic Ocean could potentially collide and interact with each other. Although meteorologists say it’s an unlikely outcome, in the event the two storms do collide, a rare phenomenon known as the Fujiwhara Effect, it could potentially cause havoc on the Eastern coast. Hurricane Humberto, the eighth named storm of this year’s hurricane season, is just north of the Caribbean and expected to strengthen into a major hurr…
By Briana Waxman, CNN More tropical storms are brewing in the Atlantic Ocean, and the National Hurricane Center is on high alert for the formation of a new storm that will join Hurricane Humberto. However, unlike Humberto, this one could make a direct impact on the United States. The powerful group of thunderstorms is already lashing Puerto Rico, the Virgin Islands, and Hispaniola with heavy rain and gusty winds. As it moves toward the Bahamas a…
Hurricanes and other systems are not usually found in tropical bottling in the vast Earth’s oceans, but there are consequences when they interfere with each other. A phenomenon known as the Fujiwhara effect can occur when two storms get too close and begin to influence each other’s strength and trajectory. This scenario could manifest off the southeast coast of the United States at the end of this weekend or early next weekend. The first storm, …
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