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
Offer sheet along with the negative reaction to an offer sheet has led to the act of signing an offer sheet becoming rare under the current CBA. The National Basketball Association uses the term offer sheet to refer to a contract offered by another team to a restricted free agent of at least one year. His current team has two days to match the offer or lose the player to the new team. However, unlike NHL offer sheets, NBA offer sheets do not require a team to relinquish a draft pick or other compensation. The National Football League uses the term offer