Genevieve, when a hurricane becomes a typhoon

NOAA
NOAA

The station has received a number of inquiries about Typhoon Genevieve due to the coverage of Hurricanes Iselle and Julio.

The system is expected to track over the open ocean with no threat to land.

Genevieve is currently about 836 nautical miles west of Johnston Island with maximum sustained winds of 125 KT or 144 MPH.

According to the Joint Typhoon Warning Center (JTWC), the forecast track is north-northwestward at 8 knots.

What does make Genevieve rare is that it turned from a hurricane to a typhoon yesterday. This is because the tropical cyclone formed in the Central Pacific and then crossed the International Date Line. The 180-degree longitude line also is the western edge of the coverage by the Central Pacific Hurricane Center in Honolulu.

Storms are named depending on where they are at the time. Hurricanes are tropical cyclones in the Atlantic Ocean and the eastern Pacific. Storms west of the International Date Line are called typhoons.

The most recent hurricane to make this transition was Ioke in 2006.

[Edit: Accuweather incorrectly stated this hasn’t happened since 1950]

Genevieve formed on July 25 in the eastern Pacific and because a hurricane in the central Pacific on August 6.

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