As the rain cooled air under the thunderstorms begins to surge forward new thunderstorms form on the leading edge of the outflow. The line may be too long to detour easily around and too wide and severe to penetrate. Start studying Weather Charts - Symbols. ... Other Symbols Trough. c. Squall Line. A body of literature and recent statistics points to some interesting relationships between the position of trough lines, the motion field in the easterly waves and the evolution of West African squall lines. d. Supercell. Often it develops on or ahead of a cold front in moist, unstable air, but it may develop in unstable air far removed from any front. squall lines over West Africa relative to the pre- dicted position of the trough line and the motion jield. A squall line is a narrow band of active thunderstorms. Dry Lines cs:User:-xfi-/Wikimedia Commons/Public Domain Chairman). Squall definition, a sudden, strong wind of brief duration that is sustained for at least two minutes at a speed of at least 16 knots (18 miles per hour, 8 meters per second), often accompanied by precipitation, and then rapidly diminishes in speed: We can’t rule out some short spells of heavy rain, as occasional squalls from the north are expected later today. A weather front is a boundary separating air masses of different characteristics such as air density, wind, and humidity.Disturbed weather often arises from these differences. The example above shows a forecast severe squall line with associated CBs. Heat is released during condensation, resulting in the rising air becoming lighter than … light, moderate, heavy: Smoke: Dust or Sand: Blowing Snow Squall Line - a line of active thunderstorms, either continuous or with breaks, including contiguous precipitation areas resulting from the existence of the thunderstorms. Severe squall lines are depicted within areas of CB activity by this symbol. This is a line of thunderstorms that generally form along a front but the storms move ahead of the front. Coverage 5/8 to 8/8 with bases below FL240 and top forecast to reach FL500. Learn vocabulary, terms, and more with flashcards, games, and other study tools. The lion has come to be his symbol, the same way Rinoa is associated with angel wings. Squall idolizes the mythical winged lion Griever, holding it as an ideal of courage and strength, traits he wishes to possess himself. Squall is later given the title Commander (委員長, Iinchō?, lit. broken: 23-27 knots (26-31 mph) dryline : Freezing Rain: 7/8: 48-52 knots (55-60 mph) Radar Intensities: Freezing Drizzle: overcast: 73-77 knots (84-89 mph) Fog: obscured: 103-107 knots (119-123 mph) Haze: Multiple rain or snow symbols indicate intensity, i.e. squall line : Snow Shower. SQL TSGR Squall line thunderstorms with hail SEV TURB Severe turbulence SEV ICE Severe icing SEV ICE (FZRA) Severe icing due to freezing rain SEV MTW Severe mountain wave HVY DS Heavy duststorm HVY SS Heavy sandstorm RDOACT CLD Radioactive cloud : Observed or forecast phenomenon: Squall Line. A squall line is depicted as shown below. The symbol for an occluded front is a purple line with alternating triangles and semi-circles (also purple) pointing in the direction the front is moving. An example of a severe squall line and the associated CB area. Squall lines typically form in unstable atmospheric environments in which low-level air can rise unaided after being initially lifted (e.g., by a front) to the point where condensation of water vapor occurs. Dry Line - a boundary separating moist and dry air masses.