NASA watches as Tropical Storm Ileana weakens from two factors

August 7, 2018, NASA's Goddard Space Flight Center
On Aug. 7 at 4:20 a.m. EDT (0920 UTC) NASA's Aqua satellite found coldest temperatures of strongest thunderstorms (yellow) in Tropical Storm Ileana were as cold as or colder than minus 70 degrees (red) Fahrenheit (minus 56.6 degrees Celsius). Credit: NRL/NASA

Tropical Storm Ileana continued to move north along the coast of western Mexico on Aug. 7 but cloud tops warmed as a result of interaction with land and nearby Hurricane John. Infrared data from NASA's Aqua satellite provided forecasters with temperature data that showed cloud top temperatures in Ileana were strongest around its center.

Despite moving along the coast, Ileana is keep enough distance so that the Government of Mexico has discontinued the Tropical Warning for southwestern Mexico.

On Aug. 7 at 4:20 a.m. EDT (0920 UTC) the Moderate Resolution Imaging Spectroradiometer or MODIS instrument aboard NASA's Aqua satellite analyzed Tropical Storm Ileana's cloud top temperatures in infrared light. MODIS found cloud top temperatures of strongest thunderstorms were located around the center. In that area, cloud top temperatures were as cold as or colder than minus 70 degrees (red) Fahrenheit (minus 56.6 degrees Celsius). Those cloud top temperatures had warmed since the previous day, indicating a weakening of the .

However, cloud top temperatures that cold indicate strong storms that have the capability to create heavy rain.

NHC noted in their discussion "Infrared and microwave satellite imagery suggest that Ileana's low-level circulation may have been disrupted by the Sierra Madre mountain range when the cyclone passed just offshore of the southwestern coast of Mexico."

At 5 a.m. EDT on Aug. 7, the National Hurricane Center cited the poorly defined center of Tropical Storm Ileana was located near latitude 19.4 N degrees north and longitude 106.9 west. Ileana is moving toward the west-northwest near 23 mph (37 kph), and this motion is expected to continue until the small tropical cyclone dissipates later today.

Maximum sustained winds are near 50 mph (85 kph) with higher gusts. Slow weakening is forecast up until Ileana dissipates later today.

Ileana is expected to produce total rain accumulations of 1 to 3 inches over coastal sections of the Mexican states of Michoacan, Colima, and Jalisco with isolated maximum amounts of 5 inches through this afternoon. These rains may cause flash flooding.

Swells generated by Ileana will be affecting portions of the coast of southwestern Mexico during the next couple of days. These swells are likely to cause life-threatening surf and rip current conditions.

NHC noted that global and regional hurricane models remain in good agreement on Ileana dissipating in less than 18 hours, due in large part from strong vertical wind created by the northwesterly outflow associated with nearby Hurricane John.

Explore further: NASA gets an infrared look at intensifying Tropical Storm Ileana

Related Stories

NASA data shows Tropical Storm John intensifying

August 6, 2018

Tropical Storm John formed quickly off the coast of southwestern Mexico around the same time as Ileana, which is just east of John. Infrared data from NASA's Aqua satellite provided forecasters with temperature data that ...

NASA finds a compact center in Hurricane Hector

August 3, 2018

Hurricane Hector has a small, tight center surrounded by strong storms. Infrared satellite imagery provides temperature data, and when NASA's Aqua satellite passed over Hector the coldest cloud tops circling the center were ...

Recommended for you

Evidence of earliest life on Earth disputed

October 17, 2018

When Australian scientists presented evidence in 2016 of life on Earth 3.7 billon years ago—pushing the record back 220 million years—it was a big deal, influencing even the search for life on Mars.

Arctic greening thaws permafrost, boosts runoff

October 17, 2018

A new collaborative study has investigated Arctic shrub-snow interactions to obtain a better understanding of the far north's tundra and vast permafrost system. Incorporating extensive in situ observations, Los Alamos National ...

Arctic ice sets speed limit for major ocean current

October 17, 2018

The Beaufort Gyre is an enormous, 600-mile-wide pool of swirling cold, fresh water in the Arctic Ocean, just north of Alaska and Canada. In the winter, this current is covered by a thick cap of ice. Each summer, as the ice ...

0 comments

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

Click here to reset your password.
Sign in to get notified via email when new comments are made.