Tropical Storm Karina: Status quo on infrared satellite imagery

August 18, 2014
NASA's Aqua satellite passed over Tropical Storm Karina on August 18 at 6:23 a.m. EDT on Monday, August 18 and the AIRS instrument captured an infrared image. The image showed strong thunderstorms (purple) continued to circle the center. Credit: NASA JPL/Ed Olsen

Since Tropical Storm Karina weakened from hurricane status, and since then, NASA satellite data has shown that the storm has been pretty consistent with strength and thunderstorm development.

Hurricane Karina formed on August 13, 2014 off the Mexican coast. The Tropical Rainfall Measuring Mission or TRMM satellite passed directly above the center of intensifying Karina on August 14, 2014 at 1927 UTC (3:27 p.m. EDT). TRMM's Microwave Imager showed that storms near Karina's center were dropping rain at a rate of over 50mm (almost 2 inches) per hour. After that TRMM fly over, Karina was upgraded to a hurricane within a couple hours. However, in less than 24 hours, by August 15 at 5 a.m. EDT (0900 UTC), Karina weakened back to tropical storm status.

In the days that followed, Karina's cloud pattern didn't change much. Satellite data showed that strong thunderstorms still circle the center, especially on the northern edge.

On August 14, the TRMM satellite showed that storms near Karina's center were dropping rain at a rate of over 50mm/2 inches per hour (red). TRMM rainfall data was overlaid on a GOES-WEST image received at 1930 UTC. Credit: NASA/JAXA/SSAI, Hal Pierce

NASA's Aqua satellite passed over Tropical Storm Karina on August 18 at 6:23 a.m. EDT on Monday, August 18 and the Atmospheric Infrared Sounder or AIRS instrument captured infrared data on the storm's clouds. Infrared data basically shows temperature, and the AIRS data showed strong thunderstorms with cloud top temperatures near -63F/-52C indicating they were high in the troposphere. The bulk of the strong thunderstorms continued to be pushed to the northern quadrant as a result of southerly wind shear.

At 11 a.m. EDT (1500 UTC) Karina's maximum sustained winds remain near 45 mph (75 kph). The center of Tropical Storm Karina was located near latitude 16.8 north and longitude 132.4 west, that's about 1,500 miles (2,415 km) east of Hilo, Hawaii. Karina is moving toward the west-southwest near 9 mph (15 kph) and is expected to slow down. The estimated minimum central pressure is 1002 millibars.

NHC's forecaster Avila noted that "Karina has the chance to slightly strengthen since the circulation is moving over warmer waters and into weaker shear. By the end of the forecast period, the outflow from larger Tropical Depression 12-E to the northeast should induce stronger shear and prevent additional strengthening."

Explore further: NASA eyes powerful bands of thunderstorms in newborn Tropical Storm Iselle

Related Stories

NASA's Aqua satellite puts two eyes on Hurricane Bertha

August 5, 2014

Two instruments or "eyes" from NASA's Aqua satellite were peering at Hurricane Bertha in the North Atlantic Ocean shortly after it became the season's second hurricane. Bertha's hurricane status didn't last long as it weakened ...

Recommended for you

New study sheds light on end of Snowball Earth period

August 24, 2015

The second ice age during the Cryogenian period was not followed by the sudden and chaotic melting-back of the ice as previously thought, but ended with regular advances and retreats of the ice, according to research published ...

Earth's mineralogy unique in the cosmos

August 26, 2015

New research from a team led by Carnegie's Robert Hazen predicts that Earth has more than 1,500 undiscovered minerals and that the exact mineral diversity of our planet is unique and could not be duplicated anywhere in the ...

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.