Nearly 30 years after Iris absorbed Humberto, forecasters watch Humberto and Imelda for signs of the rare Fujiwhara Effect ...

The Fujiwhara effect is rarely seen in the Atlantic Ocean, and though it's still not a sure thing, Tropical Storm Humberto's forecasts are already being impacted by a nearby tropical wave.

Tropical Storm Imelda and Hurricane Humberto have both strengthened, now lurking a few hundred miles away from one another.

Predicting path and intensity of Tropical Storm Humberto and Invest 94L is difficult due to something called the Fujiwhara effect.

The Fujiwhara effect is a semi-rare process that happens when two storms that are relatively close in geography orbit around ...

Storms' intensity, proximity, and size matter, and there could be significant implications if two storms merge.

There is also a danger to those in its path: The Fujiwhara effect has major implications for forecasting, and could alter a storm's track unpredictably, making it harder to warn communities in its ...

Possible Fujiwhara Effect between Hurricane Humberto and a developing storm in the tropics.

"The Fujiwhara Effect was also observed during past hurricane seasons, such as with Hurricanes Hilary and Irwin in the ...