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Hurricane and Hurricane HD, distributed by KittyCode for $3.99 for the iPhone/iPod Touch and iPad respectively is probably the most sophisticated of the “Apps” for iOS listed here. It has by far the most exploitative user interface on the iPhone and iPad and makes very good use of the multi-touch capabilities of iOS.
As with iHurricaneHD, this app allows you to track current as well as past storms, going back as far as even 1851 using available data.
Hurricane Tracker for iOS isn’t really a native “App” per se, even though it is sold on the App Store for $1.99. It’s actually a very clever “mashup” of various web data from the NHC and other sources that allows it to be presented in sort of a browser-wrapper on an iOS device.