Chapter 16 Section 2 Review Questions 1. Why is fair weather common during periods of high pressure? 2. Describe how a cold front affects weather? 3. What causes thunder and lightening? 4. Compare and contrast a watch and a warning. How can you keep safe during a tornado warning? 1. Clouds can’t form in the descending air of a high pressure system. 2. Thunderstorms are common, hail or tornadoes may form 3. Lightning is a current flow between areas of opposite electrical charge. Thunder results from the rapid heating of air around the lightening bold. 4. Watch: Conditions favorable for severe weather. Warning: Severe weather exists; take shelter in the basement or a room away from the windows. 5. Explain why The strongest storms form at some fronts the steepest frontal boundaries. produce stronger storms than others?