Many intense hurricanes in the last five years have caused tremendous damage to the the Gulf Coast and eastern US, so interest in keeping a constant eye on tropical storms has definitely increased. Last August, TUAW covered AccuWeather's tropical storm tracker for iPhone. While this information is part of the overall weather coverage available from AccuWeather, there's a recently updated iPhone app that is focused solely at hurricane watchers.
The aptly-titled Hurricane (click opens iTunes) from Kitty Code, LLC is chock-full of hurricane data. Not only do you get up-to-the minute info on tropical storms gone bad, but you can also look at historical information and storm tracks for just about every storm that has been recorded since 1851.
Hurricane first appeared in the App Store in October of 2008, and a recent update has added many more features that will be useful when the 2009 National Weather Service Hurricane Season officially kicks off on June 1st. Click the Read More link to see the details.