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90L (Atlantic Ocean)
December 9, 2013

System 90L No Longer Suspect for Development

The low pressure area known as "System 90L" in the Eastern Atlantic Ocean is no longer suspect for tropical or subtropical development. On Sunday, December 8, System 90L's showers had diminished. The low was non-tropical and was located about 100 mile south of the central Azores Islands.  Since then, upper-level winds have become hostile and the low pressure area has no chance of becoming tropical or subtropical. On December 8,  NOAA's GOES East satellite captured a visible image of the low pressure area and at that time the circulation was even difficult to identify. By December 9, System 90L fizzled.

Text credit:  Rob Gutro
NASA's Goddard Space Flight Center


Dec. 06, 2013 - Atlantic Ocean's System 90L Gets an Infrared NASA Look [image-78]

NASA's infrared instrument called AIRS that flies aboard the Aqua satellite gave scientists another look at the clouds and convection happening in a non-tropical low pressure area that's struggling to organize into a sub-tropical or tropical cyclone.

NASA's Aqua satellite passed over System 90L on Dec. 5 at 9:47 a.m. EST and the Atmospheric Infrared Sounder or AIRS instrument captured infrared data on the clouds, revealing the strongest thunderstorms east of the center. The bands of thunderstorms east of the center appeared fragmented in the infrared imagery. Within the bands, some of the cloud top temperatures were near -63F/-52C, indicative of high clouds with the potential for moderate to heavy rainfall. On Dec. 6, the heaviest shower activity was still falling east of the center, and some strong showers were also located north of the center of circulation.

The non-tropical area of low pressure was centered about 250 miles south of the Azores Islands and generating gale-force winds.

The National Hurricane Center noted that this post-Atlantic Hurricane Season wannabe is headed northward and into an area of stronger upper-level winds, wind shear and cooler waters, all of which will weaken the system. The National Hurricane Center gives this low pressure area just a 20 percent chance of becoming a subtropical or tropical cyclone during the next five days.

Text credit:  Rob Gutro
NASA's Goddard Space Flight Center


Dec. 05, 2013 - NASA Watching a Post-Atlantic Hurricane Season Low [image-51]

System 90L has developed in the eastern Atlantic Ocean today and NASA's Aqua satellite took an infrared look at the low pressure area to see if it had development potential. System 90L was located near 31.8 north and 28.1 west, about 450 miles south of the Azores Islands.

NASA's Aqua satellite passed over the low pressure area on Dec. 5 and the Atmospheric Infrared Sounder or AIRS instrument captured infrared data on the clouds, revealing the strongest thunderstorms northeast of the center. The low is non-tropical and is generating tropical-storm-force winds near 60 mph.

The low is expected to be affected by strong upper-level winds shear and move over colder waters, both of which will inhibit and likely prevent organization. The National Hurricane Center gives it a low chance of becoming a subtropical or tropical cyclone in the next couple of days.

Text credit:  Rob Gutro
NASA's Goddard Space Flight Center

Image Token: 
[image-36]
AIRS image of 90L
NASA's Aqua satellite passed over the low pressure area on Dec. 5 and the Atmospheric Infrared Sounder or AIRS instrument captured infrared data on the clouds, revealing the strongest thunderstorms northeast of the center.
Image Credit: 
NASA JPL, Ed Olsen
Image Token: 
[image-51]
TRMM image of 90L
NASA's Aqua satellite passed over System 90L on Dec. 5 at 9:47 a.m. EST and the AIRS instrument captured infrared data on the clouds, revealing the strongest thunderstorms east of the center.
Image Credit: 
NASA JPL, Ed Olsen
Image Token: 
[image-78]
Page Last Updated: December 9th, 2013
Page Editor: Lynn Jenner