7yr 09 #16 Weather Temperature

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7yr 09 #16 Weather Temperature

  1. 1. Weather!
  2. 2. Temperature <ul><li>You will usually see temperature measured in °F for maps of the United States </li></ul><ul><li>Maps of other countries will usually be measured in °C </li></ul>
  3. 3. Relative Humidity <ul><li>The relative humidity tells us how “full” the air is at the time of measurement. </li></ul><ul><li>For example, 90% relative humidity means that at that moment the air is holding 90% of the maximum amount of water it could. </li></ul>
  4. 4. Cloud Cover Symbols <ul><li>You will often see the circles drawn on a weather map </li></ul>
  5. 5. High and Low Pressure Areas <ul><li>High pressure causes air to sink </li></ul><ul><li>Usually results in several days of clear sunny skies </li></ul><ul><li>Air rises in low pressure areas and forms water droplets </li></ul><ul><li>Usually results in rain and storms </li></ul>
  6. 6. Air Masses There are two types of air masses : 2. Maritime Tropical air masses <ul><li>Continental Polar air masses </li></ul>1. Continental Polar air messes
  7. 7. Fronts A front is the boundary separating air masses of different densities <ul><li>Fronts extend both vertically and horizontally in the atmosphere </li></ul>
  8. 8. Fronts: Five Types of Fronts 1. Cold Front: The zone where cold air is replacing warmer air <ul><li>In U.S., cold fronts usually move from northwest to southeast </li></ul><ul><li>Air gets drier after a cold front moves through </li></ul>
  9. 9. Fronts: Five Types of Fronts 2. Warm Front: The zone where warm air is replacing colder air <ul><li>In U.S., warm fronts usually move from southwest to northeast </li></ul><ul><li>Air gets more humid after a warm front moves through </li></ul>
  10. 10. Fronts: Five Types of Fronts 3. S t a t i o n a r y F r o n t : W h e n e i t h e r a c o l d o r w arm f r o n t s t o p s m o v i n g <ul><li>When the front starts moving again it returns to either being a cold or warm front </li></ul>
  11. 11. Fronts: Five Types of Fronts 4. Occluded Front: Formed when a cold front overtakes a warm front <ul><li>This occurrence usually results in storms over an area </li></ul><ul><li>In U.S., the colder air usually lies to the west </li></ul>
  12. 12. Fronts: Five Types of Fronts 5. Dry Line (Dew Point Front): Boundary separating a dry air mass from a moist air mass <ul><li>This occurrence can result in tornadoes being formed </li></ul><ul><li>Usually found in western part of U.S. </li></ul>
  13. 13. Clouds: Five Types of Clouds 1. High-Level Clouds: Usually found at greater than 20,000 ft. <ul><li>Usually made of ice crystals </li></ul><ul><li>Examples include Cirrus, Cirrostratus </li></ul>
  14. 14. Clouds: Five Types of Clouds 2. Mid-Level Clouds: Usually found between 6,500 and 20,000 ft. <ul><li>Usually made of water droplets, but can be made of ice </li></ul><ul><li>Example is altocumulus </li></ul>
  15. 15. Clouds: Five Types of Clouds 3. Low-Level Clouds: Usually found lower than 6,500 ft. <ul><li>Low, lumpy clouds that produce weak to moderate precipitation </li></ul><ul><li>Examples include Nimbostratus and Stratocumulus </li></ul>
  16. 16. Clouds: Five Types of Clouds 4. Vertically developed: These clouds are thick and puffy and extend very far upwards <ul><li>Examples include Cumulonimbus and Fair Weather Cumulus </li></ul><ul><li>Ordinary Cumulus clouds can quickly become Cumulonimbus clouds that start strong thunderstorms </li></ul>
  17. 17. Clouds: Five Types of Clouds 5. Other: These are miscellaneous clouds <ul><li>These clouds do not really fit into any category, and all have different characteristics </li></ul><ul><li>Examples include billow clouds, contrails, mammatus, orographic, and pileus </li></ul>
  18. 18. Summary <ul><li>Temperature: Usually in °F, need to convert to °C </li></ul><ul><li>High pressure areas cause sunny weather; low pressure areas cause rain and storms </li></ul><ul><li>Two Types of air masses: </li></ul><ul><li>1. Continental Polar </li></ul><ul><li>2. Maritime Tropical </li></ul>
  19. 19. Summary (continued) <ul><li>Five types of fronts: </li></ul><ul><ul><li>1. Cold </li></ul></ul><ul><ul><li>2. Warm </li></ul></ul><ul><ul><li>3. Stationary </li></ul></ul><ul><ul><li>4. Occluded </li></ul></ul><ul><ul><li>5. Dew Point (Dry Line) </li></ul></ul><ul><li>Five types of clouds: </li></ul><ul><li>1. High Level </li></ul><ul><li>2. Mid Level </li></ul><ul><li>3. Low Level </li></ul><ul><li>4. Vertically developed </li></ul><ul><li>5. Miscellaneous </li></ul>
  20. 20. Sources <ul><ul><li>Palmer, Chad and Evans, David. May 20, 2005. Occluded fronts can </li></ul></ul><ul><ul><li>signal weakening of storm. Accessed 28 October 2005. http://www.usatoday.com/weather/tg/wofront/wofront.htm </li></ul></ul><ul><ul><li>Palmer, Chad and Kepple, Kevin. May 20, 2005. High-pressure systems </li></ul></ul><ul><ul><li>brings sunny days. Accessed 27 October 2005. </li></ul></ul><ul><ul><li>http://www.usatoday.com/weather/tg/whighp/whighp.htm </li></ul></ul><ul><ul><li>Palmer, Chad and Kepple, Kevin. May 20, 2005. How low pressure </li></ul></ul><ul><ul><li>systems affect weather. Accessed 27 October 2005. http://www.usatoday.com/weather/tg/wlowpres/wlowpres.htm </li></ul></ul><ul><ul><li>Weather World 2010, University of Illinois. No date of publication </li></ul></ul><ul><ul><li>given. Reading and Interpreting Weather Maps. Accessed 21 October 2005. http://ww2010.atmos.uiuc.edu/(Gh)/guides/maps/home.rxml </li></ul></ul>

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