Vertically-stacked system

Vertically-stacked System - A low-pressure system, usually a closed low or cutoff low, which is not tilted with height, i.e., located similarly at all levels of the atmosphere.

Such systems typically are weakening and are slow-moving, and are less likely to produce severe weather than tilted systems. However, cold pools aloft associated with vertically-stacked systems may enhance instability enough to produce severe ...

However, cold pools aloft associated with vertically-stacked systems may enhance instability enough to produce severe weather. Very Low Frequency (VLF)That portion of the radio frequency spectrum from 3 to 30 kHzVery Windy30 to 40 mph winds.

See also: Cloud, Updraft, Thunder, Horizon, Weather