13.1 Thunderstorms
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13.1 Thunderstorms

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13.1 Thunderstorms 13.1 Thunderstorms Presentation Transcript

  • 13.1 Thunderstorms Pages 328 - 333
  • Goal 1 Describe the 3 conditions required for thunderstorms to form
    • Requirement # 1
    • Abundant moisture in the lower atmosphere
    Image credit: steamy window by lyle58 on Flickr
    • Requirement # 2
    • Mechanism to lift moist air up for condensation to occur
    Image credit: Arrow up the tree by net_efekt on Flickr
    • Requirement # 3
    • Unstable atmosphere
    Image credit: May be Unstable by Ann Douglas on Flickr
  • Goal 2 Relate types of thunderstorms to their uplift mechanism
    • Mountain thunderstorm
      • Uplift mechanism  air mass convection
        • May be assisted by orographic lift
      • Sunlit mountain surface warms air
      • Warm air rises to create thunderstorm
      • Usually occur in afternoon, after sufficient warming
  • Image credit: “Storm clouds a’ Brewin” by Abu on Flickr Mountain Thunderstorm
    • Sea-Breeze thunderstorm
      • Uplift mechanism  air mass convection
      • Sun warms land faster than water
      • Warm land air rises
      • Cool sea-breeze replaces warm air causing a convection current
      • Rising air produces thunderstorms
      • Often occur in summer afternoons
  • Sea Breeze Thunderstorms Image credit: NOAA, image is public domain (government)
    • Frontal thunderstorm
      • Uplift mechanism  air mass collision
      • Cold front advancement
      • Line of storm formation at frontal boundary
      • More common in summer months
      • Can occur at any time of day
  • Frontal Thunderstorms Image credit: Beau Dodson, educational use permission can be seen at: http://www.weatherphotography.net/index.html
    • Rare warm-front thunderstorm
      • These can occur if the warm air mass has a high moisture content
  • Goal 3 Relate the 3 stages in the life cycle of thunderstorm to the direction of air flow
    • 1. Cumulus Stage
      • Updrafts of warm air rising
      • Moisture transported up
      • Condensation occurs
      • Latent heat relseased = more rising
      • Coalescence of raindrops
    • 2. Maturation Stage
      • Updrafts and downdrafts occur equally
      • Cold air sinking
      • Rain falling
      • Warm air still rising
      • Windy
    • 3. Dissipation Stage
      • Downdrafts of cool air falling
      • Storm loses energy, no more air rising
      • No new precipitation forming
      • Remaining rain falls from storm
  • Image credit: NOAA, image is public domain (government)