Aero-Terms are designed to be a daily reminder of the terms,
names, acronyms and explanations of the unique language that
populates the aviation world. Aerospace, sport aviation, fixed
wing, helo, you name it... it's all fair game.
Aero-Terms should serve as a quick but intriguing reminder of
the terms you may use every day, or an introduction to an aspects
of the Aero-World you may not yet be familiar with. ANN also
encourages readers to go beyond the FMI link, and further research
any intriguing terms.
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 weather.