The Tropical Rainfall Measuring Mission (TRMM) satellite passed over intensifying hurricane Julia during the afternoon of Sept. 14 and captured very heavy rain falling at 1807 UTC (2:07 p.m. EDT). That heavy rainfall was a clue that she would intensify overnight, and today, Sept. 15, she has become a Category Four hurricane on the Saffir-Simpson Scale.
NASA's Aqua satellite flew over Julia today, Sept. 15. The Atmospheric Infrared Sounder (AIRS) instrument onboard captured an infrared image of Julia at 0353 UTC (Sept. 14 at 11:53 p.m. EDT) and did not yet show an eye, which developed later. It did show very strong thunderstorms around Julia's center where cloud heights were as cold as -63 degrees Fahrenheit and heavy rain was falling.
At 11 a.m. EDT today, Sept. 15, Julia's maximum sustained winds were near 135 mph. Julia is a much small storm than the monster that Igor has become. Igor's tropical storm-force winds extend out farther than 275 miles from the center, while Julia's extend 115 miles making her less than half the size of Igor.
The outflow from Hurricane Igor and a nearby upper-level low pressure area are combining to produce southerly wind shear over Julia, which is what the National Hurricane Center noted as the reasons her intensity leveled off this morning.
Julia was located about 595 miles west-northwest of the Cape Verde Islands, near latitude 18.2 North and longitude 32.7 West. Her estimated minimum central pressure is 950 millibars. Julia is moving toward the northwest near 15 mph and this general motion is expected to continue over the next day or two.
Julia is expected to maintain its intensity today before slowly weakening later on Sept. 16 from increased southerly wind shear and cooler sea surface temperatures.
Rob Gutro | EurekAlert!
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