Tropical Storm Leslie has been on a slow track in the Atlantic, and because of that, the storm is kicking up cooler waters from below the ocean surface.
NASA's Aqua satellite flew over Tropical Storm Leslie on Sept. 5 at 0611 UTC (2:11 a.m. EDT) and noticed the strongest convection (purple) and coldest cloud top temperatures in a large area surrounding the center of circulation and in a band of thunderstorms to the east of the center. Leslie swept up cooler waters from below the surface on its slow track that slowed the storm's ability to strengthen.
Credit: NASA JPL, Ed Olsen
Those cooler waters were seen in infrared imagery on Sept. 5 at 0611 UTC (2:11 a.m. EDT) taken by the Atmospheric Infrared Sounder (AIRS) instrument that flies aboard NASA's Aqua satellite.
The cooler waters are responsible for Leslie's slow strengthening. Sea surface temperatures need to be at least as warm as 80 degrees Fahrenheit (26.6 Celsius) to maintain a tropical cyclone. When a tropical cyclone moves slowly, however, it churns up the waters below the surface, which are cooler. That cooler water saps the tropical cyclone's strength.
Infrared satellite data from NASA's AIRS instrument has often seen a "cold water wake" trailing behind a tropical cyclone. That's the cold water drawn up to the ocean's surface as the tropical cyclone passes by.
If there's another tropical cyclone behind the one that stirs up the deeper, cooler, ocean water, the second storm tends to weaken in the cold water wake.
Other than cool sea surface temperatures, Leslie has been battling wind shear, which has kept the storm below hurricane strength so far. That's changing, though, as the vertical shear has been gradually decreasing today, Sept. 5. As a result of the weaker wind shear, forecasters at the National Hurricane Center noticed a "banding eye feature" in visible satellite imagery.
The AIRS data of Tropical Storm Leslie confirmed the visible imagery. AIRS infrared data showed the strongest convection (rising air that forms thunderstorms) and coldest cloud top temperatures were in a large area surrounding the center of circulation and in a band of thunderstorms to the east of the center.
On Sept. 5 at 11 a.m. EDT, Leslie was close to hurricane strength with maximum sustained winds near 70 mph (110 kmh). Leslie is expected to reach hurricane status later in the day as the wind shear eases. Leslie's center was about 470 miles (760 km) south-southeast of Bermuda, near latitude 25.7 north and longitude 62.8 west. Leslie is moving toward the north near 2 mph (4 kmh).
Leslie is expected to continue crawling and wobbling to the north and north-northwest over the next couple of days because it is being blocked by a ridge (elongated area) of high pressure to the north and east of the storm. A strong trough (elongated area) of low pressure is expected to move out of southern Canada toward the southeastern U.S. and is expected to push Leslie northward in a couple of days.
The National Hurricane Center noted that Leslie will continue bring rough surf to Bermuda and the U.S. east coast from central Florida northward, the Northern Leeward islands, Puerto Rico and the Virgin Islands over the next couple of days.
Rob Gutro | EurekAlert!
Further reports about: > AIRS > Aqua satellite > Bermuda standard > Hurricane > Hurricane Center > NASA > National Hurricane Center > cooler waters > elongated area > hurricane strength > infrared light > sea surface temperature > surface temperature > tropical cyclone > tropical diseases > wind shear
Mountain glaciers shrinking across the West
23.10.2017 | University of Washington
Climate change weakens Walker circulation
20.10.2017 | MARUM - Zentrum für Marine Umweltwissenschaften an der Universität Bremen
Salmonellae are dangerous pathogens that enter the body via contaminated food and can cause severe infections. But these bacteria are also known to target...
University of Maryland researchers contribute to historic detection of gravitational waves and light created by event
On August 17, 2017, at 12:41:04 UTC, scientists made the first direct observation of a merger between two neutron stars--the dense, collapsed cores that remain...
Seven new papers describe the first-ever detection of light from a gravitational wave source. The event, caused by two neutron stars colliding and merging together, was dubbed GW170817 because it sent ripples through space-time that reached Earth on 2017 August 17. Around the world, hundreds of excited astronomers mobilized quickly and were able to observe the event using numerous telescopes, providing a wealth of new data.
Previous detections of gravitational waves have all involved the merger of two black holes, a feat that won the 2017 Nobel Prize in Physics earlier this month....
Material defects in end products can quickly result in failures in many areas of industry, and have a massive impact on the safe use of their products. This is why, in the field of quality assurance, intelligent, nondestructive sensor systems play a key role. They allow testing components and parts in a rapid and cost-efficient manner without destroying the actual product or changing its surface. Experts from the Fraunhofer IZFP in Saarbrücken will be presenting two exhibits at the Blechexpo in Stuttgart from 7–10 November 2017 that allow fast, reliable, and automated characterization of materials and detection of defects (Hall 5, Booth 5306).
When quality testing uses time-consuming destructive test methods, it can result in enormous costs due to damaging or destroying the products. And given that...
Using a new cooling technique MPQ scientists succeed at observing collisions in a dense beam of cold and slow dipolar molecules.
How do chemical reactions proceed at extremely low temperatures? The answer requires the investigation of molecular samples that are cold, dense, and slow at...
23.10.2017 | Event News
17.10.2017 | Event News
10.10.2017 | Event News
24.10.2017 | Life Sciences
23.10.2017 | Life Sciences
23.10.2017 | Physics and Astronomy