CUT-OFF HIGH
A warm high which has become displaced and is on the polarward side of the jet stream. It occurs mostly during the spring and is most frequent over northeastern Siberia, Alaska, and Greenland. It is an example of a blocking 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.
A blocking situation is attended by pronounced meridional flow in the upper levels, often comprising one or more closed anticyclonic circulations at high latitudes and cyclonic circulations at low latitudes (cut-off highs and cut-off lows).
Sometimes a cut-off low occurs with a cut-off high over the higher latitudes, typically in blocking situations. Such slow-moving lows are associated with unsettled weather and, in summer, with thunderstorms.
WARM HIGH A high pressure system that has its warmest temperatures at or near the center of circulation. Contrast with a cold high. Related terms: cut-off high and omega block ...
 See also: Pressure, Norther, Storm, Surface, Atmosphere
  
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