NASA sees tiny Tropical Depression Irwin winding down

August 1, 2017, NASA's Goddard Space Flight Center
This infrared image of Tropical Depression Irwin was taken Aug. 1 at 6:23 a.m. EDT (10:23 UTC) by NASA's Aqua satellite. The tiny blue area indicates the coldest cloud tops. Northwest of Irwin are the remnants of former tropical storm Hilary. Credit: NASA JPL, Ed Olsen

Infrared imagery from NASA looked at cloud top temperatures in Tropical Depression Irwin found a very small area of cold clouds and no strong storms. Irwin appeared as a swirl of clouds as it continued to wind down.

The Atmospheric Infrared Sounder or AIRS instrument aboard NASA's Aqua satellite looked at cloud top temperatures in Tropical Depression Irwin using infrared light. The AIRS data were taken on 6:11 a.m. EDT (10:11 UTC) on Aug 1 and showed cloud top temperatures had warmed since the day before. Irwin basically consists of a tight swirl of low clouds devoid of deep convection.

The AIRS image also revealed a smaller area of cold cloud tops northwest of Irwin. That area are the remnant of former tropical storm Hilary.

Basically, the higher the , the colder and stronger the storms than make up the tropical cyclone. So, as that gathered by the AIRS instrument can identify the strongest sides of a tropical cyclone. Of course, infrared data can also tell if temperatures have warmed, meaning that the uplift has weakened in the system. Weaker uplift means less creation of the thunderstorms that make up a tropical cyclone.

That's exactly what happened to Irwin as it moved over cool waters.

The infrared data was false-colored at NASA's Jet Propulsion Laboratory in Pasadena, California, where AIRS data is managed.

National Hurricane Center (NHC) noted at 11 a.m. EDT (1500 UTC) the center of Tropical Depression Irwin was located near 25.9 degrees north latitude and 129.2 degrees west longitude. That's about 1,230 miles (1,980 km) west-northwest of the southernmost tip of Baja California, Mexico. Irwin was moving toward the north-northwest near 10 mph (17 kph). A motion toward the northwest should begin later today. Maximum sustained winds have decreased to near 35 mph (55 kph) with higher gusts.

The NHC said Irwin is forecast to become a remnant low later today, August 1.

Explore further: NASA casts an infrared eye on Tropical Storm Irwin

Related Stories

NASA looks at Hurricane Irwin in infrared light

July 25, 2017

NASA's Aqua satellite passed over Tropical Storm Irwin as it was strengthening toward hurricane status. Aqua gathered temperature data using infrared light that revealed the power building within.

Recommended for you

Study suggests trees are crucial to the future of our cities

March 25, 2019

The shade of a single tree can provide welcome relief from the hot summer sun. But when that single tree is part of a small forest, it creates a profound cooling effect. According to a study published today in the Proceedings ...

Matter waves and quantum splinters

March 25, 2019

Physicists in the United States, Austria and Brazil have shown that shaking ultracold Bose-Einstein condensates (BECs) can cause them to either divide into uniform segments or shatter into unpredictable splinters, depending ...

Apple pivot led by star-packed video service

March 25, 2019

With Hollywood stars galore, Apple unveiled its streaming video plans Monday along with news and game subscription offerings as part of an effort to shift its focus to digital content and services to break free of its reliance ...

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.