7yr 09 #16 Weather Temperature

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