the author of this app says:
Display RAOB upper air data in a SkewT, Tephigram, or Stuve chart. This version displays only United States upper air data. Zoom the scale to see detail about inversion strength and height.
Collect data for consecutive cycles and show 12 or 24 hour temperature changes. Positive temperature changes shown in light red, negative changes shown in light blue.
Aircraft pilots, balloonists, and soaring pilots can monitor upper air data at the nearest upper air station to help with flight planning.
What's New in version 1.2.2
* Display Lifted Index based on Surface heating and lowest 50mb average moisture.
* Display CAPE based on surface heating and lowest 50mb average moisture.
- Requires iOS 5.0 or later.