JetStream - An Online School for Weather

Tropical Cyclone Winston

On February 20, 2016, Tropical Cyclone Winston became the second strongest storm to ever make landfall as it raked the island of Koro, Fiji. It struck the island as a Category 5 storm, with sustained winds measured at 177 mph (285 km/h) near landfall.

After leaving Koro, which sits between the larger islands of Viti Levu and Vanua Leva, the storm maintained most of its strength as it moved westward and skimmed the coast of Viti Levu. Prior to striking Fiji, Tropical Cyclone Winston battered Tonga on February 17 as it was intensifying from a Category 4 to a Category 5 storm.

The Moderate Resolution Imaging Spectroradiometer (MODIS) aboard NASA's Aqua satellite captured this true-color image of Tropical Cyclone Winston in the South Pacific Ocean west of Fiji. At that time Winston had begun to weaken slightly, but still maintained a distinct eye. Enlarge image (~4 mb)

Credit: Jeff Schmaltz, Moderate Resolution Imaging Spectroradiometer (MODIS) Land Rapid Response Team, National Aeronautics and Space Administration (NASA), Goddard Space Flight Center (GSFC).

Welcome to JetStream, the National Weather Service Online Weather School. This site is designed to help educators, emergency managers, or anyone interested in learning about weather and weather safety.

The information contained in JetStream is arranged by subject; beginning with global and large scale weather patterns followed by lessons on air masses, wind patterns, cloud formations, thunderstorms, lightning, hail, damaging winds, tornados, tropical storms, cyclones and flooding. Interspersed in JetStream are "Learning Lessons" which can be used to enhance the educational experience.

You are free to use the materials in any manner you wish. We welcome your feedback on this project. Your input will greatly assist others in teaching the "hows" and "whys" of weather. Not sure where to begin? Click to see all topics in JetStream in the Topic Matrix.