NASA shows winds causing Tropical Cyclone Lorna's demise

NASA shows winds causing Tropical Cyclone Lorna's demise
On April 29, 2019 at 4:29 a.m. EDT (0829 UTC), the MODIS instrument aboard NASA's Aqua satellite provided a visible image of Tropical Cyclone Lorna in the Southern Indian Ocean. Credit: NASA/NRL

NASA's Aqua satellite saw Tropical Cyclone Lorna was being torn apart by strong northwesterly wind shear in the Southern Indian Ocean.

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 29 at 4:29 a.m. EDT (0829 UTC), the Moderate Resolution Imaging Spectroradiometer or MODIS instrument aboard NASA's Aqua satellite provided a visible image of Lorna. Northwesterly winds were pushing the bulk of Lorna's clouds far southeast of its center.

At 11 a.m. EDT (1500 UTC), the Joint Typhoon Warning Center or JTWC issued their final warning in Lorna. At that time, JTWC noted that Tropical Cyclone Lorna was located near 22.1 degrees south latitude and 88.8 degrees east longitude. That is 738 nautical miles southwest of Cocos Island. Lorna was moving to the south-southwest. Maximum sustained winds dropped to 35 knots (40 mph/65 kph) and the storm was getting weaker.

Lorna is rapidly weakening under adverse atmospheric conditions. The JTWC noted that the "environment is very hostile with extremely high (50 to 60 knot/57 to 69 mph/ /92 to 111 kph) ," which is tearing the storm apart. Lorna is forecast to dissipate by April 30.


Explore further

NASA's Aqua Satellite catches Tropical Cyclone Lorna organizing

Citation: NASA shows winds causing Tropical Cyclone Lorna's demise (2019, April 29) retrieved 16 June 2019 from https://phys.org/news/2019-04-nasa-tropical-cyclone-lorna-demise.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.
26 shares

Feedback to editors

User comments

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