Warm Core Weather Systems: Weather systems with the air at their center warmer than the surrounding air.
Warm Front: When warm air replaces cold air.
Warm Front Symbol: ...
Referring to weather systems with sizes on the order of individual thunderstorms - generally around 10 km. See synoptic scale, mesoscale.
Straight line winds ...
A theory that weather systems behave unpredictably over time.
Chlorofluorocarbon (CFC)
Compounds of carbon, chlorine and flourine, which have been responsible for destruction of high-level ozone.
SURFACE BASED - Weather systems occurring in the lowest levels of the atmosphere and involving air near or just above the ground. Surface based convection involves air from near the ground to rise.
Used to describe weather systems that lie in between synoptic scale and local scale. This generally means weather features that are between 25km and 250km in size.
MacroscaleLarge scale, characteristic of weather systems several hundred to several thousand kilometers in diameter.
on a specific thunderstorm; aid in displaying shear and rotation in thunderstorms and storm top divergence that might otherwise be obscured by storm motion; and gain higher resolution velocity productStorm ScaleReferring to weather systems with ...
These weather systems may cover fifty to several hundreds of miles. Smaller phenomena are classified as storms, while larger are classified as synoptic-scale.
Weather systems are large enough to feel the curvature of the earth and generally rotate less than once a day so a similar timescale to the earth's rotation so the Coriolis effect is dominant.
Coriolis Effect - In synoptic scale weather systems (hurricanes and large mid-latitude storms), the Coriolis force causes the air to rotate around a low pressure center in a cyclonic direction.
Zonal and Meridional Meteorologists will often use the terms "zonal" and "meridonial" to describe the upper level wind patterns which indicate the trajectory of air masses and weather systems.
We try to build up "snap shots " of the weather at given times - this shows how the weather systems are moving.
(Synoptic Scale) Size scale referring generally to weather systems with horizontal dimensions of several hundred miles or more. Most high and low pressure areas seen on weather maps are synoptic-scale systems.
Size scale referring to weather systems smaller than synoptic-scale systems but larger than storm-scales ???ystems. Horizontal dimensions generally range from around 50 miles to several hundred miles.
synoptic scale"Used with respect to weather systems ranging in size from several hundred kilometers to several thousand kilometers, the scale of migratory high and low pressure systems (frontal cyclones) of the lower troposphere.
Storm-Scale - referring to weather systems with sizes on the order of individual thunderstorms
Storm Surge - an atypical rise of the sea along a shore primarily resulting from the winds of a storm, especially those of a hurricane ...
High Seas Forecasts (HSF): This National Weather Service (NWS) marine forecast are designed to meet the needs of ships making ocean transits; therefore, the primary focus is on major weather systems and sea states affecting oceangoing vessels.
atmospheric phenomena having horizontal scales ranging from a few to several hundred kilometers, including thunderstorms, squall lines, fronts, precipitation bands in tropical and extratropical cyclones, and topographically generated weather systems ...
Circulation- The pattern of the movement of air. General circulation is the flow of air of large, semi-permanent weather systems, while secondary circulation is the flow of air of more temporary weather systems.
Steady-state forecast A weather prediction based on the past movement of surface weather systems. It assumes that the systems will move in the same direction and at approximately the same speed as they have been moving.
A scale of distance used by meteorologists to describe large weather disturbances. Weather systems which span thousands to millions of square miles and which exist for several days are on the "synoptic scale".
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Synoptic scale - Used to classify large-scale weather systems more than 200 miles across.
Blocking system A cutoff cyclone or anticyclone that blocks the usual west-to-east progression of weather systems.
Satellite Imagery: Images formed from data collected by a weather satellite that reveal visual information on the nature of the atmosphere such as the flow of water vapour, the development and movement of weather systems, ...
QUASI-GEOSTROPHIC APPROXIMATION: An approximation to the complete equations describing atmospheric motion in which only the terms most important for the growth and decay of synoptic scale extratropical weather systems (i.e.
Strong winds concentrated within a narrow zone in the atmosphere in the upper troposphere, about 30,000 feet aloft that generally move in an easterly direction that drive weather systems around the globe.
Jet Stream - A strong high level wind found in the atmosphere that can reach speeds in excess of 200 mph, usually occurring 6 to 9 miles above the ground. These winds often steer the movement of surface air masses and weather systems.
tornado: small mass of air that spins rapidly about an almost vertical axis and forms a funnel cloud that contacts the ground. Comes down from a cumulonimbus cloud and is considered probably the most destructive of all weather systems.
After an introductory chapter dealing with the global circulation, and its relevance to regional/local weather systems in the British Isles, the following chapters focus on the regions which make up these islands.
However, the cold stratospheric temperatures associated with weather systems can cause clouds to form that can lead to the conversion of chlorine compound from inert to reactive forms.
 See also: Weather, Pressure, Air, Temperature, Thunder
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