Isaac on Aug. 29, 2012, via a full disk NASA satellite image courtesy of NASA.
NOAA satellite image from Wednesday, Aug. 29, at 1:45 a.m.
NASA image of Hurricane Isaac as it moves toward the Gulf Coast on Aug. 28.
Image from 1:45 p.m. EDT on Tuesday Aug. 28.
Top: Tropical Storm Isaac on Aug. 27, 2012. Bottom: Hurricane Katrina on Aug. 28, 2005.