A 3-D NASA Analyzation of Hurricane Sandy (image) NASA/Goddard Space Flight Center Caption At 2:20 p.m. EDT on Sunday, Oct. 28, Hurricane Sandy was a marginal category 1 hurricane and its eyewall is modest, as TRMM reveals, which gives forecasters and scientists hints about its possible future strength. The eyewall appeared somewhat compact with its 40 km (24.8 miles) diameter The eyewall contained only relatively light precipitation, and none of Sandy's eyewall storm cells managed to burst through, or even reach, the tropopause which has about a 10 km (6.2 miles) height at mid-latitudes. Evidence of the weak updrafts in the eyewall comes from the fact that the TRMM radar's reflectivity stayed under 40 dBZ, a commonly cited signal strength at which updrafts can be vigorous enough to form hail and to lift smaller ice particles up through the tropopause and into the stratosphere. Credit NASA/Owen Kelley 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.