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Jet stream
- 1. Meteorology 101 Weather forTeachers National Weather Service Part 2
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- 5. Chasing Rabbits #4 Adesert is defined as any region where the annual rainfall is LESS than 10 inches. Temperature is irrelevant. <10” < 5” Annual Rainfall
- 6. Jet Stream The atmosphere’sresponse to where the temperature gradient is strongest (which is also where the greatest density change occurs). Is identified when and where wind speed is ≥50 kt (but can exceed 200 kt). What is the Jet Stream?
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- 8. Jet Stream Boeing 787cruising speed is 587 mph American Airlines #180 January 11, 2019 791 mph
- 9. Elevation Jet Stream Does notoccur at any one level but changes in elevation
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- 12. Jet Stream The changein jet stream elevation imparts vertical motion in the atmosphere.
- 13. Jet Stream Inclement weathertypically occurs between the trough and downstream ridge.
- 14. Jet Stream Fair weathertypically occurs between the ridge and downstream trough.
- 15. Jet Stream Greatest risein height is typically where surface low pressure is located.
- 16. Jet Stream Greatest decreasein height is typically where surface high pressure is located.
- 17. Jet Stream Greatest verticalmotion of air impacts air pressure at the surface. Isobars are lines of equal
- 18. Surface Wind What directiondoes the wind blow around high- and low-pressure areas?
- 19. Surface Wind Let’s lookat how the Coriolis effect impacts the winds direction.
- 20. Surface Wind Let’s lookat how the Coriolis effect impacts the winds direction.
- 21. Surface Wind Let’s lookat how the Coriolis effect impacts the winds direction.
- 22. Surface Wind Coriolis effectis balanced by the pressure gradient. Results in the geostrophic wind.
- 23. Surface Wind The windflows along isobars (more or less)
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- 25. Chasing Rabbits #5 Howto find high- and low-pressure centers outdoors* 1. Face into the wind. 2. Hold your arms out from the side of your body. 3. Your left hand points to the center of High pressure. 4. Your right hand points to the center of Low pressure. * Not so much for the Seattle area.
- 26. Fronts Cold Front Cold (cooler)air replacing warm air.
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- 28. Fronts 3:45 pm 80°F 4:00pm 40°F
- 29. Fronts Warm Front Warmer airreplacing cold air.
- 30. Fronts Stationary Front Boundary betweentwo air masses with no frontal movement.
- 31. Fronts Cold Fronts Cooler/Colder moredense air undercuts the warmer less dense air.
- 32. Fronts Cold Fronts Forceful risingof warm air helps create thunderstorms.
- 33. Fronts Warm Fronts Lighter, denserwarm air moves faster than the retreating warm front causing it to rise.
- 34. Fronts Warm Fronts Clouds andrain develop “ahead” of warm front.
- 35. Back to theFuture We return back to the beginning and complete the weather cycle.
- 36. Learn MORE at… JetStream– An Online School for Weather www.weather.gov/jetstream A free resource with over 35 lesson plans and activities