13.1 Thunderstorms Pages 328 - 333
Goal 1 Describe the 3 conditions required for thunderstorms to form
<ul><li>Requirement # 1 </li></ul><ul><li>Abundant  moisture  in the lower atmosphere </li></ul>Image credit: steamy windo...
<ul><li>Requirement # 2 </li></ul><ul><li>Mechanism to  lift moist air up  for  condensation  to occur </li></ul>Image cre...
<ul><li>Requirement # 3 </li></ul><ul><li>Unstable atmosphere </li></ul>Image credit: May be Unstable by Ann Douglas on Fl...
Goal 2 Relate types of thunderstorms to their uplift mechanism
<ul><li>Mountain thunderstorm </li></ul><ul><ul><li>Uplift mechanism    air mass convection </li></ul></ul><ul><ul><ul><l...
Image credit: “Storm clouds a’ Brewin” by Abu on Flickr Mountain Thunderstorm
<ul><li>Sea-Breeze thunderstorm </li></ul><ul><ul><li>Uplift mechanism    air mass convection </li></ul></ul><ul><ul><li>...
Sea Breeze  Thunderstorms Image credit: NOAA, image is public domain (government)
<ul><li>Frontal thunderstorm </li></ul><ul><ul><li>Uplift mechanism    air mass collision </li></ul></ul><ul><ul><li>Cold...
Frontal  Thunderstorms Image credit: Beau Dodson, educational use permission can be seen at: http://www.weatherphotography...
<ul><li>Rare warm-front thunderstorm </li></ul><ul><ul><li>These can occur if the warm air mass has a high moisture conten...
Goal 3 Relate the 3 stages in the life cycle of thunderstorm to the direction of air flow
<ul><li>1. Cumulus Stage </li></ul><ul><ul><li>Updrafts of warm air rising </li></ul></ul><ul><ul><li>Moisture transported...
<ul><li>2. Maturation Stage </li></ul><ul><ul><li>Updrafts and downdrafts occur equally </li></ul></ul><ul><ul><li>Cold ai...
<ul><li>3. Dissipation Stage </li></ul><ul><ul><li>Downdrafts of cool air falling </li></ul></ul><ul><ul><li>Storm loses e...
Image credit: NOAA, image is public domain (government)
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13.1 Thunderstorms

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  • 13.1 Thunderstorms

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

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