meteorological satellites and radar have promoted the study of the organization
and evolution of convective systems. The evolution of convective systems is
affected by dynamic and thermodynamic conditions. The organizational modes of
convection can to some extent affect the type of weather events. Severe
convective wind (SCW) events occur frequently over North China, but which of
the primary organizational modes are responsible for SCW events over North
China? A paper published in Advances in
Atmospheric Sciences sought to solve this problem.
wind events for mountain and plain regions over North China are mainly associated
with cluster cells and squall lines, respectively.
The Severe Weather
Prediction Center of the China Meteorological Administration defines any wind
gust ≥ 17 m s?1 as a severe wind event. In the study, if a severe
wind event was associated with severe thunderstorms, it was classified as an
SCW event. Based on some previous studies of classification schemes, the major organizational
modes were classified into six categories: individual cells, cluster cells,
broken line, nonlinear-shaped, squall lines, and bow echo.
The topography may
be an important factor in the organizational modes for SCW events over North
China. The highest numbers of SCW events were over the mountains, where which
were generally associated with disorganized systems of cluster cells. In
contrast, SCW events associated with linear systems occurred mainly over the
plains. Values of convective available potential energy, precipitable water,
0–3-km shear, and 0–6-km shear, were demonstrably larger over the plains than
over the mountains, which have had an evident effect on the organizational
modes of SCW events.
Yang, X. L., and
J. H. Sun, 2018: Organizational modes of severe wind-producing convective
systems over North China. Adv. Atmos.
Sci., 35(5), https://doi.org/10.1007/s00376-017-7114-2 , http://18.104.22.168/aas/EN/10.1007/s00376-017-7114-2 .