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Notes: Severe Weather Name: _________________________ Block: _______ 1.Flash Floods: Flash floods occur when rainfall or snowmelt exceeds the lands __________________________________and/or the carrying capacity of a river. Flash floods can occur in desert landscapes, valleys, coastal areas, and __________________________along rivers. Floods ____________more people than any other disaster. 2. Thunderstorms: Characterized by: Dark ____________________________ clouds that produce heavy rain, sounds of thunder, flashes of lightning, strong winds, and sometimes hail. Thunderstorms often occur in the summer when the air is________________________________________. Thunderstorms form along fronts because air is _______________________________and ahead of fronts called __________________________. Supercells are large single-cell thunderstorms with extremely _______________________the updrafts rotate to form tornadoes. 3. Tornadoes: A tornado is a violently rotating column of air that forms from a mesocyclone, when it touches the ground it becomes a tornado. ________________________ on the center of a tornado is ______________________ and air is sucked into the funnel cloud. A tornado is measured using the _____________ ______________, it is based on wind speed. A tornado can form in any state during any time of year, but they are most common in “tornado alley” during the spring and summer months. 4. Hurricanes: A hurricane starts out as a tropical storm. It begins to gain strength from__________________________________, which evaporates and then condenses to make storm clouds. Winds help push warm, moist air upwards and help the hurricane get bigger as it rotates and moves. The ________________________________causes a hurricane to rotate counterclockwise. A hurricane in the South Pacific is called a __________________________. A hurricane’s strength is measured using the ___________________________ Scale, it is based on wind speeds, category 1-5. 5. Blizzards: A true blizzard is more than just heavy snow, it must meet the following criteria: 1. The winds must exceed ______________ or 56 kmph. 2. The temperature must be below __________or -7°C. 3. The blowing snow must __________________________ by less than ¼ of a mile. 4. Conditions must persist for more than _____ hours. Looking at the pie chart….. What severe weather event has the ability to significantly impact the most people? ____________________________