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NASA's infrared look at strengthening Typhoon Chan-Hom

07.07.2015

During the early morning hours on July 6, Chan-Hom was a strong tropical storm. Infrared data from NASA's Aqua satellite showed very powerful thunderstorms that hinted at intensification, and later in the day, Chan-Hom became a typhoon.

The Atmospheric Infrared Sounder or AIRS instrument that flies aboard NASA's Aqua satellite gathered infrared temperature data on Chan-Hom when it was a Tropical Storm on July 6 at 04:29 UTC (12:29 a.m. EDT).


The AIRS instrument aboard NASA's Aqua satellite gathered infrared temperature data on Chan-Hom when it was a Tropical Storm on July 6 at 04:29 UTC (12:29 a.m. EDT). Purple areas indicate the coldest cloud tops and strongest thunderstorms within.

Credit: NASA JPL, Ed Olsen

The coldest thunderstorm cloud tops measured were near -63 Fahrenheit or -52 Celsius. Cloud top temperatures that cold are high into the troposphere and capable of generating heavy rain.

The Joint Typhoon Warning Center (JTWC) looked at animated infrared imagery that showed a slight improvement in organization with a marked increase in central convection (rising air that forms the thunderstorms that make up a tropical cyclone). Other satellite imagery showed that there were tightly-curved bands of thunderstorms wrapping into a defined center.

Between 0900 UTC and 1500 UTC today, July 6, Chan-Hom's maximum sustained winds increased from 60 knots (69 mph/111 kph) to 65 knots (75 mph/120 kph) bringing it to typhoon strength.

It was centered near 18.1 North latitude and 138.9 East longitude, about 825 nautical miles southeast of Kadena Air Force Base, Guam. Chan-Hom has tracked west-northwestward at 14 knots (16 mph/26 kph).

Chan-Hom is intensifying as it moves northwest through the Northwestern Pacific Ocean. The JTWC forecasts the storm to continue to strengthen over the next three days and expected to peak as a Category 4 typhoon on the Saffir-Simpson Wind Scale, with maximum sustained winds nearing 130 knots (149.6 mph/240.8 kph). The storm is forecast to pass between Ishigakjima and Kadena islands on July 9 before making landfall in eastern China as a typhoon.

Rob Gutro | EurekAlert!

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