LFC - Level of free convection. The level at which lifted air becomes unstable and hence rises on its own. Relative humidity - A ratio of the amount of water vapor that the air is holding to the amount of water vapor the air can hold, which depends on temperature. Ridge - An area of high pressure. An area of anticylclonically curving winds.
Saturation is where the amount of water condensing is equal to the amount of water evaporating.
Sleet - Frozen precipitation that falls as little chucks o' ice. Sounding - A temperature profile of the atmosphere measured by a radiosonde. Also can indicate wind and dew point. Steering - Directing other motion. The jet stream steers surface storm systems.