T-Td<=5℃

>15℃

850-500

Precipitation areas are prone to occur near the ground convergence line

High altitude trough

(Vortex/trough) rear northwest airflow type

Sub-high edge type

Tropical System

The right side of the high-altitude exit and the left side of the low-altitude exit are generally precipitation areas.

925

850

700

500

200/300

The lower the altitude, the easier it is for hail to occur, generally <5km

The lower it is, the easier it is to produce hail, generally <8km

When the time difference is large, it is necessary to adjust the non-insulatable line

The larger the value, the more unstable it is, generally >1000 or so.

The larger the value, the more unstable it is, generally >35

When <0, it is judged as unstable.