Usually, rainfall associated with cold fronts is in the form of heavy deluge; more rain may fall in a few minutes as the cold front passes than during the whole passage of a warm front. As the cold front passes, the clouds roll by and the air temperature may become noticeably cooler.
Face powder. Loose mineral powder. Face powder is a cosmetic powder applied to the face to set a foundation after application. It can also be reapplied throughout the day to minimize shininess caused by oily skin. There is translucent sheer powder, and there is pigmented powder.
The technical name for this white powder is Efflorescence (from the French, meaning to flower out). It is an accumulation of minerals and salts on masonry surfaces, such as brick, cement, and sometimes stone. Building inspectors and home owners should know how to prevent and remove this unsightly residue. They must also be aware that, while efflorescence in itself is not a problem, it is a symptom of a problem, namely the presence of excess water in the masonry, which can lead to more serious structural and health issues.