© NASA/NOAA Suomi NPP/VIIRSSuper Typhoon Jelawat on March 30, 2018.
Typhoon Jelawat not only became the first typhoon of 2018,
but then exploded into a Category 4 super typhoon, a relative rarity this early in the calendar.Jelawat was first categorized as a tropical depression last Saturday, then strengthened to become the year's first typhoon Thursday afternoon, U.S. time.
Over the western Pacific Ocean north of the equator and west of the International Dateline, tropical cyclones are called typhoons when they strengthen to the equivalent of a hurricane.
But Jelawat, named for a Malaysian word for a freshwater fish, wasn't content to merely slide across the typhoon threshold.
Because of a
west-to-east cocoon of lower wind shear, strong outflow winds aloft providing ventilation for thunderstorms, and some warmer than average ocean water, Jelawat rapidly intensified,
gaining 70 knots (roughly 80 mph) of intensity in just 24 hours, becoming the equivalent of a
Category 4 super typhoon by Friday morning, U.S. time.
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