NASA imagery shows winds tearing Tropical Cyclone Wallace

NASA imagery shows winds tearing Tropical Cyclone Wallace
On April 9, 2019, the MODIS instrument aboard NASA's Terra satellite provided a visible image of Tropical Cyclone Wallace in the Southern Indian Ocean, off the coast of Western Australia. Credit: NASA Worldview, Earth Observing System Data and Information System (EOSDIS)

Visible imagery from NASA's Terra satellite showed Tropical Cyclone Wallace being sheared apart from strong northwesterly winds. Clouds from Wallace stretched far inland over a well-known wilderness area.

In general, is a measure of how the speed and direction of winds change with altitude. Tropical cyclones are like rotating cylinders of winds. Each level needs to be stacked on top each other vertically in order for the storm to maintain strength or intensify. Wind shear occurs when winds at different levels of the atmosphere push against the rotating cylinder of winds, weakening the rotation by pushing it apart at different levels.

On April 9, the Moderate Resolution Imaging Spectroradiometer or MODIS instrument aboard NASA's Terra satellite provided a visible image of Wallace. Wallace's center was over the Southern Indian Ocean and well off the Pilbara coast of Western Australia. Northwesterly winds were pushing the bulk of Wallace's clouds southeast of its center.

Wallace's southeastern quadrant was spreading clouds along the Pilbara coastline of northern Western Australia from Exmouth north to Port Hedland. Clouds were being pushed far inland and were streaming over Karijini National Park. The park is a large wilderness area in the Hamersley Range of Western Australia.

At 8 a.m. EDT (8:00 p.m. AWST local time), the Australian Bureau of Meteorology or ABM reported that Tropical Cyclone Wallace was located near 16.5 degrees south latitude and 113.9 east longitude. That is 560 km north-northwest of Karratha and 610 km north of Exmouth. Wallace was moving west-southwest at 7 kilometers per hour. Maximum sustained winds were near 45 knots (52 mph/83 kph).

ABM said "Tropical Cyclone Wallace will continue to weaken as it tracks westwards.

Wallace is forecast to be below tropical cyclone intensity by Wednesday [April 10] afternoon.


Explore further

NASA-NOAA satellite finds a more circular Tropical Cyclone Wallace

Citation: NASA imagery shows winds tearing Tropical Cyclone Wallace (2019, April 9) retrieved 22 April 2019 from https://phys.org/news/2019-04-nasa-imagery-tropical-cyclone-wallace.html
This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.
11 shares

Feedback to editors

User comments

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more