Aqua Image of Norman (IMAGE) NASA/Goddard Space Flight Center Caption On Aug. 30 at 11 a.m. EDT (1500 UTC), NOAA's National Hurricane Center or NHC noted Norman had rapidly strengthened during the past 12 to 24 hours, with the development of a well-defined 20-nautical mile wide eye and a thick ring of cold cloud tops (purple) of minus 94 to minus 121 degrees Fahrenheit (minus 70 to minus 85 degrees Celsius) Credit NASA JPL/Heidar Thrastarson Usage Restrictions None License Licensed content 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.