Main characteristics of mesoscale weather system

In addition to the small scale and short life span, the main feature of small and medium-scale weather systems is that the level of meteorological elements changes greatly, so the weather produced is far more intense than that of weather scale systems such as fronts (see above) and cyclones. For example, when the squall line crosses the border, the instantaneous pressure change can almost reach 1 hectopascal per minute, and the temperature change can reach10℃; Every 15 minutes; The wind speed can be tens of meters per second, the vertical speed can generally reach 1 ~ 10 meters per second, and even more than 50 meters per second (several centimeters per second in large-scale weather systems) is observed, which is the same order of magnitude as the horizontal speed; The vertical pressure gradient force and downward gravity are unbalanced, that is, static equilibrium is not satisfied, and the horizontal geostrophic deflection force and horizontal pressure gradient force are also unbalanced, that is, the horizontal acceleration is the same order of magnitude as the horizontal geostrophic deflection force and horizontal pressure gradient force, resulting in the non-parallel wind and isobar (see the equilibrium state of large air force and atmospheric movement). Because of these characteristics of small and medium-scale weather systems, it is required to have more dense and accurate detection data in time and space when analyzing the weather of small and medium-scale weather systems.