A friend asked if a device that could see into trees would alert folks to problem (hollow) trees in advance of the storm damage on September 14, 2008 in Louisville. It may have forecasted some weaknesses and problems, but as the following photos show, it would miss many in urban areas. We have trees that are poorly branched, so "V" shaped trees would split. Others are poorly rooted due to urban conditions. They are shallow rooted and confined, so when a wind hits a mature tree (even an Oak), there is damage. Preventative care with trees is best. It's even better to do it as the tree matures rather than when problems are noticeable.
