Intensive Cold-Air Invasion Detection and Classification with Deep Learning in Complicated Meteorological Systems

Table 1

Classification of stational ITR in China.

Grade	Division index
Weak	The daily minimum temperature drops by less than 6°C within 48 hours
Medium strong	The daily minimum temperature drops by more than or equal to 6°C but less than 8°C within 48 hours; or the daily minimum temperature drops by more than or equal to 8°C within 48 hours but fails to reduce the daily minimum temperature to 8°C or below
Strong	The daily minimum temperature drops by more than or equal to 8°C within 48 hours, and the daily minimum temperature also reduces to 8°C or below