Cloud the bottom of the hierarchy. Clouds in the troposphere assume five physical forms based on structure and process of formation. These forms are commonly used for the purpose of satellite analysis. They are given below in approximate ascending order of instability or convective activity. "Non-convective" stratiform clouds appear in "stable" airmass conditions and, in general, have flat sheet-like structures that can form at any altitude in the troposphere. The stratiform group is divided by altitude range into the genera cirrostratus (high-level), altostratus (mid-level), stratus (low-level), and nimbostratus (multi-level). Fog is commonly considered a surface-based cloud layer. The fog may form
Weird or What? four stories per episode. This version is also shown in New Zealand. The version generally shown outside of the U.S. features three stories per episode, in a different order and is hosted by William Shatner. Note: Online streaming of U.S. episodes are not available Weird or What? Weird or What? is a series on the Discovery Channel and History (Canada) hosted by William Shatner (except for the U.S. Version of Season 1, where his segments were replaced by a fourth story). Each episode contains three separate stories of the bizarre and unexplained. As the show unfolds, it weighs various supernatural