Air Masses, Fronts and Weather Systems
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1 Air Masses, Fronts and Weather Systems
2 Can you name the air mass?
3
4
5 What is a Front? Fronts are boundaries that separate air masses Where air masses meet and do not mix.
6
7 Types of Fronts: Cold Front Warm Front Stationary Front Occluded Front
8 Note: The direction the teeth or the bumps face is the direction the front is moving
9 Name the front!
10 Name the front!
11 Name the front!
12 Name the front!
13 Tornadoes
14 Other Names for Tornadoes Tornado comes from the Spanish word, tronada, which means thunderstorm. Other names for tornadoes are twisters, dust devils, whirlwinds, waterspouts, and cyclones.
15 Tornado Facts Tornadoes are the most powerful weather phenomenon known. A violently rotating column of air extending from a thunderstorm to the ground. About 80% of all tornadoes are associated with thunderstorms and mid-latitude cyclones; the other 20% are spawned by hurricanes that make landfall. Conditions for tornado formation: Cool, dry air (e.g., from the Rockies) colliding with warm, moist air (from the Gulf). Tornadoes can be on the ground for an instant to several hours, but the average time is 5 minutes.
16 On average 1000 tornadoes occur every year in the U.S.
17 TORNADO Facts Tornadoes usually form at the rear of a thunderstorm. Most last less than 15 minutes. The funnel can vary from 40 feet to one-quarter mile. Winds can reach more than 260 mi/hr.
18 Tornado Facts Some monster tornadoes are a mile wide, have winds up to 300 mph, last an hour or more, and travel 200 miles. Tornadoes occur most often in the spring (April- June) Most tornadoes in the US occur along Tornado Alley, an area that runs from Texas to Illinois. Pictures from Macon Tornado!
19 Fujita Pearson Tornado Scale F-0: mph, chimney damage, tree branches broken F-1: mph, mobile homes pushed off foundation or overturned F-2: mph, considerable damage, mobile homes demolished, trees uprooted F-3: mph, roofs and walls torn down, trains overturned, cars thrown F-4: mph, well-constructed walls leveled F-5: mph, homes lifted off foundation and carried considerable distances, autos thrown as far as 100 meters
20 Hurricanes and Tornadoes Oh My!!
21 What do you call it?
22 Hurricane Structure
23 A tropical storm becomes a hurricane when its winds exceed 73 mph.
24 Saffir-Simpson Scale Category One -- Winds mph Category Two -- Winds mph Category Three -- Winds mph Category Four -- Winds mph Category Five -- Winds greater than 155 mph
25 Hurricane Facts Hurricanes can be very big! They can be seen from outer space. The entire formation and life of a hurricane takes days or weeks. Hurricanes usually lose power as they travel over land. Hurricanes bring strong winds, heavy rain, storm surges, flooding, and tornadoes. Storm surges cause the most damage!
26 Katrina Pictures!!
27 Review 1. Which is larger, a hurricane or a tornado? 2. Which moves faster, a hurricane or a tornado? 3. Which lasts longer? 4. Where do hurricanes form? 5. Where do tornadoes form? 6. What do we call the area of the US that has a high occurrence of tornadoes? 7. How long do tornadoes last? 8. How long do hurricanes last?
28 Venn Diagram Time
29 WHAT DO HURRICANES AND TORNADOES HAVE IN COMMON? Low Pressure Strong Winds Hazardous to Life and Property
30 HOW DO THEY DIFFER? Location Size Duration Season of Occurrence Distinctive Hazards
31 Location Hurricanes form over warm (80 F) tropical seas Latitude 7-15 degrees North and South of the equator Tornadoes form over land in the mid-latitudes
32 TORNADO VS HURRICANE Tornadoes last 15 minutes; whereas, hurricanes can last more than a week. Tornadoes have a funnel that can vary in diameter from 40 feet to one-quarter mile; whereas, hurricanes can vary in diameter from 200 to 500 miles. The winds in a hurricane rarely exceed 150 mi/hr; whereas, the winds in a tornado can reach 260 mi/hr.
33 WHEN DO THEY OCCUR? Hurricane season Late Summer and Fall Tornado season Spring and Early Summer
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