Presentation on theme: "The Wonderful World of Weather. Factors Affecting Weather."— Presentation transcript:
The Wonderful World of Weather
Factors Affecting Weather
As the earth revolves around the sun it is tilted at 23.5 degrees Because of the earth’s revolution and tilt direct sunlight hits the earth differently at different parts causing changing seasons on the earth Earths Tilt
Mark points farthest north and south that the sun’s rays shine directly overhead at noon The day on which this occurs is called a solstice The Tropic of Cancer and Tropic of Capricorn
In the Northern Hemisphere the summer solstice begins summer, the longest day of the year. The winter solstice begins winter the shortest day of the year Winter Solstice in Northern HemisphereSummer Solstice in Northern Hemisphere
This is another sign of changing seasons Occurs 2 times a year when the days and nights all over the world are equal in length. Marks the beginning of Spring and Autumn Equinox
Types of Precipitation
Convectional: Typical of hot climate (Tropical) Occurs after morning sunshine heats warm moist air. Clouds form in the afternoon and rain falls Clouds forming over the Florida peninsula. What time of day do you think this picture was taken?
Orographic: Associated with mountain areas Mountains block the passage of air and cause it to rise Storms drop more rain on the windward side and create a rain shadow on the leeward side because it gets little rain from the descending dry air Moist air rises and cools on windward side of mountains Condensatio n occurs and precipitation results Drier air descends down the mountains and warms Leeward side of mountain range has rain shadow desert MT RANGE WINDWARD SIDE LEEWARD SIDE In which part of the United States will you find orographic precipitation? Where is the rain shadow?
Mount Waialeale on the island of Kauai in Hawaii has the greatest annual average of precipitation (486” per year or 40. feet). The backside (leeward) side of the mountain gets only 20” of rainfall per year.
Cherrapunjee (on the south side of The Himalayas) holds the all-time record for precipitation in one year.
Frontal: Mid-latitude frontal storms Cold, dense air pushes warm, light air upward causing precipitation to form
Landforms Landmasses heat and cool relatively quickly; there are wider temperature ranges in the interior of large landmasses.
Large Bodies of Water Water heats and cools more slowly than adjacent landmasses, so it moderates temperatures there. (It doesn’t get as cold or as hot.)
Cold and Warm Ocean Currents
Elevation As elevation increases above sea level, temperature decreases. (Compare the current temperature in Mexico City to that of Austin?) The air cools and becomes thinner and loses its ability to hold moisture.
Air Movement winds move air and moisture As a result weather can change very rapidly
Pressure Systems Wind will flow from high pressure zones towards low pressure zones. Low pressure zones are associated with rain as warm air rises and releases moisture.