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Storms  Unit 5 Earth Science. Severe Weather Safety Watches- conditions are favorable Warnings- conditions already exist Examples- Tornadoes, Flooding,

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Presentation on theme: "Storms  Unit 5 Earth Science. Severe Weather Safety Watches- conditions are favorable Warnings- conditions already exist Examples- Tornadoes, Flooding,"— Presentation transcript:

1 Storms  Unit 5 Earth Science

2 Severe Weather Safety Watches- conditions are favorable Warnings- conditions already exist Examples- Tornadoes, Flooding, Thunderstorms, Blizzards, Winter Mixes and Hurricanes

3 How Thunderstorms Form For a thunderstorm to form, three conditions must exist. For a thunderstorm to form, three conditions must exist. Thunder, Lightning, Rain, High Winds Thunder, Lightning, Rain, High Winds Possibly Hail, Tornadoes Possibly Hail, Tornadoes 1.There must be an abundant source of moisture in the lower levels of the atmosphere. 2.Some mechanism must lift the air so that the moisture can condense. 3.The portion of the atmosphere through which the cloud grows must be unstable.

4 Earth Science Thunderstorms Thunderstorms

5 Mr. Ertl Earth Science Lightning and Thunder Lightning – discharge of electricity from a t-cloud to ground, to another cloud, or from the ground to a cloud Lightning – discharge of electricity from a t-cloud to ground, to another cloud, or from the ground to a cloud Extremely high temp., air expands explosively – causes thunder Extremely high temp., air expands explosively – causes thunder Light travels faster than sound – causes delay between lightning and thunder Light travels faster than sound – causes delay between lightning and thunder Thunder can be heard up to 16 km Thunder can be heard up to 16 km

6 Lightning

7 Lightning

8 Mr. Ertl Earth ScienceTornadoes Narrow, funnel shaped-column of spiral winds that extends downward from cloud Narrow, funnel shaped-column of spiral winds that extends downward from cloud Occur more frequent in US than anywhere else Occur more frequent in US than anywhere else Mississippi River Valley and Great Plains Mississippi River Valley and Great Plains Grow out of T-Storms, produced when cold, dry air meets warm, moist air Grow out of T-Storms, produced when cold, dry air meets warm, moist air Winds between km/hour Winds between km/hour Usually travel SW to NE Usually travel SW to NE

9 Mr. Ertl Earth Science Intensity measure on Fujita Scale Intensity measure on Fujita ScaleFujita ScaleFujita Scale –The scale ranges from F0, which is characterized by winds of up to 118 km/h, to the violent F5, which can pack winds of more than 500 km/h.

10 Earth Science

11 Tornadoes

12

13 Storm Surges

14 Formation of Hurricanes Hurricane seasons starts June 1 – November 30 Hurricane seasons starts June 1 – November 30 A tropical disturbance forms. A tropical disturbance forms. –Has to form near the equator over water. –The warm air rises and cool to form clouds. –Forms large intense low pressure system. Winds reach 23 mph  tropical depression Winds reach 23 mph  tropical depression Winds reach 39 mph  tropical storm Winds reach 39 mph  tropical storm –Receives a name Winds reach 74 mph  hurricane Winds reach 74 mph  hurricane

15 How to Name a Hurricane Each time a storm reaches tropical storm status it receives a name. Each time a storm reaches tropical storm status it receives a name. –Name are picking from a list in alphabetical order.

16 Classifying a Hurricane Use the Saffir- Simpson Scale Use the Saffir- Simpson Scale –Based on a 1-5 scale. 1 being the least amount of damage. 1 being the least amount of damage. 5 the most amount of damage. 5 the most amount of damage.

17 Saffir- Simpson Scale

18 Hurricane Hazards Hurricane Advisories

19 Mr. Ertl Science 8

20 Then came Katrina …

21 …a strong category 3 hurricane when it struck New Orleans.

22 Compare satellite images before and during the flood. (Dark blue is water.)


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