The document defines various weather-related terms:
1) It defines hurricanes as rotating columns of air extending between the surface and a convective cloud. Tornadoes are violently rotating columns touching the ground.
2) Air masses are large bodies of air with similar temperature and moisture characteristics. Weather describes the atmosphere at a point in time and its effects.
3) Cirrus, cirrostratus and cirrocumulus clouds are high-level clouds with different appearances that can predict weather. Cumulonimbus clouds produce hail and thunderstorms.
4) Fronts like cold fronts and warm fronts describe boundaries between differing air masses. The Coriolis effect causes tropical storm rotation. O