Institute of Atmospheric Environment;
China Meteorological Administration;
Shenyang 110016;
China;
Regional Climate Center of Shenyang;
Liaoning Province Meteorological Administration;
Shenyang 110016;
China;
Key Opening Laboratory for Northeast China Cold Vortex Research;
China Meteorological Administration;
Shenyang 110016;
China;
Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters/Key Laboratory of Meteorological Disaster;
Ministry of Education/International Joint Research Laboratory on Climate and Environment Change;
Nanjing University of Information Science and Technology;
Nanjing 210044;
China;
Liaoning Provincial Meteorological Service Center;
Shenyang 110016;
China;
Climate Change Research Center;
Institute of Atmospheric Physics;
and Nansen-Zhu International;
northeastern China; early summer; Northeast China Cold Vortex; classification of activity paths; machine learning method; k-means clustering; high-pressure blocking;