Tropical Storm Muifa (image) NASA/Goddard Space Flight Center Caption NASA's Aqua satellite passed over huge Tropical Storm Muifa on July 29, 2011 at 04:17 UTC (12:17 a.m. EDT. The infrared image revealed a large area of powerful, high thunderstorms with cold cloud tops (purple) east and west of the center where cloud temperatures were colder than -63 Fahrenheit (-52 Celsius). Muifa is about 1000 miles wide. Credit NASA JPL, Ed Olsen Usage Restrictions None Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.