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A violent disturbance in the atmosphere. Involves sudden changes in air pressure Cause rapid air movement Conditions that bring one kind of storm in one area often cause other kinds of storms in the same area • A thunderstorm is a small storm often accompanied by heavy precipitation and frequent thunder and lightening. – A thunderstorm forms when warm, humid air rises rapidly within a cumulonimbus cloud. • Thunderstorms • Tornadoes • Snowstorms • Hurricanes • • • • Torrential Downpours Strong winds at greater than 58 miles per hour Hail ¾ inch diameter (or larger) Frequent lightning • Issued by National Weather Service • This means that conditions are favorable for a thunderstorm • Length is multiple hours. • Issued By Local Weather Service • Means a severe storm has been spotted by doppler radar • Usually lasts for only an hour • A sudden spark or energy discharge, caused when electric discharges jump between parts of a cloud, nearby clouds, or between a cloud and the ground. • Because a lightening bolt can heat the air near to it close to 30,000 ̊ C, it causes the air to expand explosively. Thunder is the sound of the explosion. Since light travels faster than sound you see lightening flash • Temperatures of over 30,000C (much hotter than Sun’s surface) • Heated air expands suddenly and explosively making a sound of thunder. • Stay indoors, away from doors and windows. • Avoid objects that conducts electricity, such as metal objects and bodies of water. • Do not seek shelter under the trees. • Do not use phones with cords. Remember: Cars are pretty safe… • Because light travels much faster than sound.