Chapter 3: Weather Fronts & Storms
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1 Chapter 3: Weather Fronts & Storms
2 An AIR MASS is a large body of air that has similar characteristics (temperature, humidity) throughout. Air masses can be massively large. Air masses are classified by location formed and temperature: CONTINENTAL means it formed over land and is dry. MARINE means it formed over water and is wet. TROPICAL means it s warm. POLAR means it s cold. As air masses move, they take their moisture and temperature (weather) with them. Air masses move with winds. Air masses usually move west to east.
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4 A FRONT is a boundary between air masses.
5 Remember: Warm air ALWAYS rises!!! WARM FRONT: Warm air and cold air both pushing in same direction. COLD FRONT: Warm air and cold air pushing in opposite directions.
6 OCCLUDED FRONT: Warm air is sandwiched in between two cold air masses. STATIONARY FRONT: Warm air and cold air push equally in opposite directions. It s a standoff!
7 HIGH PRESSURE SYSTEM Air sinks. Air moves towards low pressure. Air moves clockwise due to the Coriolis Effect. Large Change slowly Nice weather Clear skies, calm air, gentle breezes Temperature warms up Clouds disappear LOW PRESSURE SYSTEM Air moves around and into low pressure then rises. Air moves counterclockwise. Occurs where cold and warm air masses meet Large Stormy weather
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9 A TROPICAL STORM is a low pressure system starting near the equator with winds 40+ mph. A HURRICANE has winds 74+ mph. Hurricanes are also known as typhoons and cyclones depending on where they form. In the US, hurricane season is August to October. A hurricane s energy comes from warm water. Once on land, it loses energy quickly.
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11 The EYE is in the center and is miles wide. It is calm here. The EYE WALL is just past the eye and contains a ring of destructive clouds bringing heavy winds and rainfall. The STORM SURGE is a wall of water that travels with the hurricane. This huge wave destroys lots of oceanfront property.
12 Usually from low pressure systems Form when two air masses collide A BLIZZARD is a snowstorm with wind speeds 35+ mph and very low temperatures (usually less than 20ᵒF). An ICE STORM occurs when rain falls and then immediately freezes. Problems from winter storms... Knock down trees Break power lines (1/4 inch of ice can break a line) Crush roofs Little to no travel Businesses and schools close for extended periods of time
13 LAKE-EFFECT SNOW is found near the Great Lakes. Air masses move over the Great Lakes, pick up moisture, and then dump large quantities of snow quickly.
14 Electrical charges build up in clouds. As that spark jumps to another cloud or the ground, LIGHTNING is formed. This heats the air quickly. As the air quickly expands and contracts, THUNDER is formed. A THUNDERSTORM is a rainstorm with thunder and lightning. Cause.... Flash flooding sudden flooding can carry cars away High winds can topple power lines and trees Hail can damage cars and houses Lightning can hit a person or a thing; can start forest fires
15 A TORNADO is a violent, rotating column of air that stretches from the clouds to the ground. Form when warm air masses from the Gulf of Mexico meet cold air masses on land. Most tornadoes are small and last only a couple minutes. Tornadoes are unpredictable. It is difficult to guess where they will go next. Can pick up and touch down Can lift items off the ground Causes.... Downed trees Loss of power Roofs to tear off Livestock to be hurt North America has more tornadoes than anywhere else in the world. Tornado Alley is especially hard-hit. It extends from Texas to Iowa, Kansas, Nebraska and Ohio. Only 20% of all tornadoes are strong enough to damage trees, lift cars, or pull off roofs. These can last several hours. 1% of tornadoes can tear down a strong building.
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17 April 16, 2011 North Carolina Tornadoes Downtown Raleigh
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20 Lowes in Sanford
21 Raleigh
22 Apex
23 I-40
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25 Holly Springs
26 Sanford
27 Holly Springs Avent Ferry Road
28 Holly Springs
29 Holly Springs
30 Raleigh
31 Meteorologists prognosticate and prevaricate. What does this mean? A METEOROLOGIST is a scientist who specializes in the weather. Look at past and present weather conditions Examine data Make predictions National Oceanic & Atmospheric Administration (NOAA)
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33 ISOBARS are lines that connect areas with identical air pressures. They help predict wind movements.
34 Satellite images show accumulation of water vapor in the air. INFRARED satellite images show intensity of storms.
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