Line A line of cumulus connected to and extending outward from the most active portion of a parent cumulonimbus , usually found on the southwest side of the storm. The cloud line has roughly a stair step appearance with the taller clouds adjacent to the parent cumulonimbus . It is most frequently associated with strong or severe thunderstorms . Flash Flooding Rapidly-developing flooding of tributaries, usually as a result of thunderstorms . Front A transition zone between two differing air masses.
Basic types are cold front , warm front , and stationary front .
Thunderstorms can form in association with any of these fronts, although fronts are not necessary for thunderstorm development. A funnel-shaped cloud extending from a towering cumulus or cumulonimbus base. It is associated with a towering air column that is not in contact with the ground. If a ground-based debris or dust whirl is visible below the funnel aloft, the cloud is a tornado . GOES-8 One of the Geostationary Operational Environmental Satellites .