Question

severe weather plans - spring/summer
question 1: what type of severe weather is it? how does it occur?

Explanation:

The question is too general. Severe weather in spring/summer can include thunderstorms, tornadoes, hurricanes etc. Thunderstorms occur due to warm, moist air rising rapidly, cooling and condensing into clouds. Tornadoes form from severe thunderstorms when there are strong wind - shear conditions. Hurricanes develop over warm ocean waters when there is a combination of warm water, moisture, and specific wind patterns.

Answer:

There are multiple types of severe weather in spring/summer such as thunderstorms, tornadoes, hurricanes. Their formation mechanisms vary as described above.