national weather service shreveport working together to save lives understanding severe storms
TRANSCRIPT
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National Weather Service Shreveport
Working Together to Save Lives
Understanding
Severe StormsSevere Storms
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TopicsTopics
• Global Circulations
•Thunderstorm Ingredients
• Lightning
• Hail
• Tornadoes and Downbursts
• Flooding
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Global CirculationsGlobal Circulations
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Jet StreamJet Stream
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Thunderstorm Ingredients
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Thunderstorm IngredientsThunderstorm Ingredients
Low level warm and moist airfrom the Gulf of
Upper level jet stream can carrypockets of cold air aloft overmoist air, increasing lift andinstability
Moisture - Preferably in the lower or mid levels of the atmosphere
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Thunderstorm IngredientsThunderstorm Ingredients
Source of lift – Agent which lifts the warm, moist air starting the thunderstorm
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Another Source of LiftAnother Source of Lift
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Thunderstorm IngredientsThunderstorm Ingredients
Instability – Ability for air to accelerate upward/downward when started up/down
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Thunderstorm Life CycleThunderstorm Life Cycle
Cumulus Stage Mature Stage Dissipating Stage
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Multicell Thunderstorm Multicell Thunderstorm
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motion
(Cross section)
Squall Lines Squall Lines
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dow
nd
raft
N
Tornado
Supercell Thunderstorms Supercell Thunderstorms
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Shear Rotation
Shear vs. RotationShear vs. Rotation
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LightningLightning
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LightningLightning
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Lightning FormationLightning Formation
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ThunderThunder
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HailHail
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Weather Related Hazards Weather Related HazardsHail
Baseball size hail can do severe
damage
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Hail FormationHail Formation
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Tornadoes and Downburst
Tornadoes and Downburst
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Tornadoes TornadoesFujita Scale
F0-F1 Winds 60 - 115 mph
F2-F3Winds 115 - 205 mph
F4-F5Winds > 205 mph
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Damaging WindDamaging Wind
•Cold air ‘bursts’ down from cloud
• Spreads on ground contact
• Accelerates on outwash
• Can reach 150 mph
• Tornado-like damage
•Cold air ‘bursts’ down from cloud
• Spreads on ground contact
• Accelerates on outwash
• Can reach 150 mph
• Tornado-like damage
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Downbursts and AircraftDownbursts and Aircraft
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FloodingFlooding
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Weather Related Hazards Weather Related HazardsFlash 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
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Acknowledgments Acknowledgments
• Jetstream website – Southern Region Headquarters , National Weather Service
www.srh.noaa.gov/srh/jetstream
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The EndThe End
http://www.weather.gov