Robyn is flying into the tropical cyclone history books for this year's Southern Indian Ocean cyclone season. Two instruments on NASA's Aqua satellite caught a glimpse of the storm while flying over it yesterday.

NASA's Aqua satellite is armed with several instruments that provide scientists with data on tropical cyclones. The Moderate Imaging Resolution Spectrometer, or MODIS, captures high resolution visible and infrared images. The Atmospheric Infrared Sounder, or AIRS instrument, captures infrared, visible and microwave imagery (coupled with another instrument on Aqua). AIRS satellite imagery from April 5 revealed there were still some high and strong thunderstorms to the west of Robyn's center. The MODIS instrument satellite image also reflects that finding because the higher thunderstorms are visible and appear as of the thunderstorm tops are bubbling up in the west side of the storm.

The Joint Typhoon Warning Center issued their final advisory on Robyn today, April 6th, at 09:00 UTC (5:00 a.m. EDT). At that time, Robyn's maximum sustained winds were down to 39 mph (35 knots) and weakening. It was located about 365 nautical miles southwest of Cocos Island, near 15.5 South and 91.7 East. It is moving north-northwest near 4 mph (3 knots). Robyn has encountered stronger vertical wind shear and will continue to weaken. There is a possibility that the wind shear may weaken and allow Robyn to regenerate. If that happens it would be more appropriate to rename it "Phoenix." Meanwhile, forecasters continue to keep an eye on the system.