STORMS Across 1. a sudden spark, or energy discharge, caused when positive and negative charges build up and move between parts of a cloud. 3. an announcement that a tornado has been spotted 4. Stage of a storm before it becomes a hurricane (under 74 mph) 6. hurricanes start out as a tropical _____. 9. causes more snow to occur near the Great Lakes 13. a rapidly whirling, funnel-shaped cloud that reaches down from a storm cloud and touches the ground 16. an announcement that a tornado is possible 18. heavy rainstorms accompanied by thunder and lightning Down 2. a huge tropical storm with wind speeds of 74 mph (119 kph) or higher 5. type of front where thunderstorms occur 7. a violent disturbance in the atmosphere 8. storm cloud 10. the calm and clear center of a hurricane 11. scale that measures a tornado based on intensity (wind speed and damage) From F0-F5 12. Hurricanes in the Western Pacific Ocean 14. a dome or wall of water that sweeps across the coast where a hurricane lands 15. sound of the explosion causes by rapidly heated air expanding 16. location in the mid-west where most tornadoes occur 17. Tornado occurring over a lake or ocean