COLD HIGH A high pressure system that has its coldest temperatures at or near the center of circulation, and horizontally, is thermally barotropic. It is shallow in nature, as circulation decreases with height.
Arctic highA very cold high pressure that originates over the Arctic Ocean.
Contrast with a cold high. Examples include a cut-off high and an omega block. WARM LOW A low pressure system that has its coldest temperatures at or near the center of circulation. Contrast with a cold low.
BLOCKING HIGH The development of a warm ridge or cutoff high aloft at high latitudes which becomes associated with a cold high at the surface, causing a split in the westerly winds.
Such a wind ushers in cold high pressure from the continental United States and temperatures drop markedly. These winds are most common between November and April.
 See also: Blowing, Precipitation, Snow, Center, Thunderstorms
|
