severe storms thunderstormstornadoeshurricanes. what are severe storms? they form under very special...
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Severe StormsSevere Storms
ThunderstormsThunderstorms
TornadoesTornadoes
HurricanesHurricanes
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What are severe storms?What are severe storms?
• They form under very special conditions
• They often grow our of another, more common storm – thunderstorms!
Think about the last time you experienced a thunderstorm. What is associated with a thunderstorm?
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ThunderstormsThunderstorms
• Thunderstorms are the most common kind of storm.
• They form in clouds called thunderheads – cumulonimbus clouds!
• They cause huge electrical sparks – lightning!
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Thunderstorms con’t.Thunderstorms con’t.
• The lightning heats the air and causes thunder.
• Thunderstorms usually have heavy rains and strong winds.
• Some thunderstorms also produce hail.
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Thunderstorm fun facts!Thunderstorm fun facts!
• Thunderstorms are the strongest natural phenomenon. At any given moment, about 2,000 thunderstorms are occurring on Earth. During these storms, lightning strikes Earth as frequently as 100 times every second.
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TornadoesTornadoes
• The most violent thunderstorms spin off even more dangerous storms – tornadoes!
• A tornado is a violent whirling wind that moves across the ground in a narrow path.
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Tornadoes – How do they happen?Tornadoes – How do they happen?
• When the updraft in a convection cell is really strong, the air rushes in from all sides at high speeds.
• The air curves into a spin. This lowers the air pressure. Air rushes in even faster, which lowers the air pressure even more. The tornado gets faster and faster!
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How they happen…con’t.How they happen…con’t.
• As the tornado gets stronger, a funnel forms that eventually touches the ground. Winds can reach up to 300mph in the center of a tornado.
• Tornados move across the ground very fast but can change its direction continually.
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Tornadoes – Where they happenTornadoes – Where they happen
• Tornadoes in the US seem to occur in the Midwest and in the South.
• Tornadoes form where dry, cold air masses mix with warm, moist air masses.
• In the US, this is most likely to happen in the Great Plains region and the Mississippi Valley.
• Tornadoes are most likely to occur when there are big differences in the air masses. This happens mostly in early spring and summer.
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Hurricanes – How do they form?Hurricanes – How do they form?
• Hurricanes are very large swirling storms with very low pressure at the center.
• They form over tropical oceans – near the equator.
• Air masses near the equator don’t form fronts. Instead they form lots of thunderstorms.
• As global winds push these thunderstorms along, they line up in rows. Strong heating and lots of evaporation over the ocean can cause a large low-pressure center to form.
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Hurricane TracksHurricane Tracks
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Severe Storms - NotesSevere Storms - Notes
• Thunderstorms are the most common kind of storm.• They form in clouds called thunderheads –
cumulonimbus clouds!• They cause huge electrical sparks – lightning!
• The most violent thunderstorms spin off even more dangerous storms – tornadoes!
• A tornado is a violent whirling wind that moves across the ground in a narrow path.
• Hurricanes are very large swirling storms with very low pressure at the center.
• They form over tropical oceans – near the equator.