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Kona Low over Hawaii, an example of a cut-off low from the main core of the jet stream. [1]A cut-off low (or cutoff low), sometimes referred to as the weatherman's woe, is defined by the National Weather Service as "a closed upper-level low which has become completely displaced (cut off) from basic westerly current, and moves independently of that current."
Precisely this situation occurred over the southern United States during late spring and early summer of 2007, when a cut-off-low system hovering over the region brought unusually cool temperatures and an extraordinary amount of rain to Texas and Oklahoma (see June 2007 Texas flooding), and a cut-off-high near the coast of Georgia that caused a ...
Kona lows, most extratropical cyclones, and tropical upper tropospheric cyclones are cold core lows. In the eastern half of the north Pacific Ocean and north Indian Ocean, the formation of a weak circulation underneath a mid to upper-tropospheric low which has cut off from the main belt of the westerlies during the cold season is called a subtropical cyclone.
The low-level convergence caused by the cut-off low can trigger squall lines and rough seas, and the low-level spiral cloud bands caused by the upper level circulation are parallel to the low-level wind direction. [2] This has also been witnessed with upper level lows which occur at higher latitudes.
In meteorology, a low-pressure area, low area or low is a region where the atmospheric pressure is lower than that of surrounding locations. It is the opposite of a high-pressure area . Low-pressure areas are commonly associated with inclement weather (such as cloudy, windy, with possible rain or storms), [ 1 ] while high-pressure areas are ...
Even so, it is far from a regular occurrence on account of the region's northern latitude. In nearly all cases, a snowfall event this far north requires a cut-off low system: in which the coldest air bypasses the usual southern alpine regions, instead advancing in a north-northeasterly direction up the centre of New South Wales.
At the same time, the storm spawned a secondary low along its frontal boundary, over the Southeastern United States. The new storm intensified to 991 mbars as it moved off the coast of New England, while the winter storm's main low pressure area became a 1000-mbar cut-off low over the Great Lakes, while continuing to steadily weaken. Despite ...
An L represents low pressure, which frequently accompanies precipitation. Various symbols are used not just for frontal zones and other surface boundaries on weather maps, but also to depict the present weather at various locations on the weather map. Areas of precipitation help determine the frontal type and location.