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.