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National Weather Service Shreveport Working Together to Save Lives

Understanding Severe Storms. National Weather Service Shreveport Working Together to Save Lives. Topics. Global Circulations Thunderstorm Ingredients Lightning Hail Tornadoes and Downbursts Flooding. Global Circulations. Jet Stream. Thunderstorm Ingredients.

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National Weather Service Shreveport Working Together to Save Lives

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  1. Understanding Severe Storms National Weather Service Shreveport Working Together to Save Lives

  2. Topics • Global Circulations • Thunderstorm Ingredients • Lightning • Hail • Tornadoes and Downbursts • Flooding

  3. Global Circulations

  4. Jet Stream

  5. Thunderstorm Ingredients

  6. Thunderstorm Ingredients Moisture - Preferably in the lower or mid levels of the atmosphere

  7. Thunderstorm Ingredients Source of lift – Agent which lifts the warm, moist air starting the thunderstorm

  8. Another Source of Lift

  9. Thunderstorm Ingredients Instability – Ability for air to accelerate upward/downward when started up/down

  10. Dissipating Stage Cumulus Stage Mature Stage Thunderstorm Life Cycle

  11. Multicell Thunderstorm

  12. motion Squall Lines (Cross section)

  13. Supercell Thunderstorms  N downdraft Tornado

  14. Shear vs. Rotation Rotation Shear

  15. Lightning

  16. Lightning

  17. Lightning Formation

  18. Thunder

  19. Hail

  20. Weather Related Hazards Hail Baseball size hail can do severe damage

  21. Hail Formation

  22. Tornadoes and Downburst

  23. Tornadoes Fujita Scale F0-F1 Winds 60 - 115 mph F4-F5 Winds > 205 mph F2-F3 Winds 115 - 205 mph

  24. Damaging Wind • Cold air ‘bursts’ down from cloud • Spreads on ground contact • Accelerates on outwash • Can reach 150 mph • Tornado-like damage

  25. Downbursts and Aircraft

  26. Flooding

  27. Weather Related Hazards Flash Flooding Safety Tips • Do not drive across a flooded roadway or low water crossing • If your vehicle stalls in high water, leave it and seek higher ground • Be especially careful at night when it is harder to recognize the dangers of flash flooding

  28. Acknowledgments • Jetstream website – Southern Region Headquarters , National Weather Service • www.srh.noaa.gov/srh/jetstream

  29. The End

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