Super Typhoon Sinlaku, a powerful early-season storm, generated enormous atmospheric ripples visible from space in April 2026. These atmospheric gravity waves extended high above Earth. This observation offers scientists new insights into how tropical cyclones affect various atmospheric layers.
Sinlaku rapidly intensified into a Category 5-equivalent storm. It delivered heavy rainfall and flooding to the Mariana Islands. Satellites detected the gravity waves as the typhoon strengthened over open water. The Visible Infrared Imaging Radiometer Suite (VIIRS) instrument on the NOAA-20 satellite captured images of these waves. They appeared as radiating ripples in the mesospheric airglow, similar to rings on a pond.
Intense tropical cyclones create powerful convection near their eyewalls. This process fuels towering cumulonimbus clouds, known as "hot towers." These clouds can extend beyond the troposphere, Earth's lowest atmospheric layer. They produce waves that travel upward into the stratosphere and mesosphere. Observations showed Sinlaku's gravity waves propagating radially and upward in a cone-like shape.
Scientists believe studying these gravity waves could help forecast storm intensification. This is particularly useful for storms in remote ocean areas where direct observations are limited. A geostationary satellite with appropriate infrared imaging technology could potentially monitor these waves continuously. This could provide new data on tropical cyclone development.
Gravity waves also influence larger atmospheric processes. They affect stratospheric wind patterns, which impact long-range weather forecasts. These waves can also trigger traveling ionospheric disturbances. These disturbances are ripples in plasma density that can interfere with satellite signals and radio communications. A single event like a tropical cyclone can significantly impact space weather.
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