1. What comes to mind when you hear the term severe weather?
Objective
Warm-up
You will learn the characteristics of storms, in order to identify the various types of storms.
What comes to mind when you hear the term severe weather?

2. Most Recognizable

3. What is a Severe Storm? Winter Storms Tornadoes
Most violent weather is associated with LOW pressure systems because air of different properties mixed there
Thunderstorms Hurricanes
Winter Storms
Tornadoes

4. Thunder & Lightning
Superheated air expands and creates shock wave Can be heard up to 30 miles away Flash-Sound Interval: 5 sec/mi (3 sec/km) Not one second = one mile “Heat Lightning” is ordinary lightning illuminating the clouds Warm, humid, air rising in unstable environment

5. Violent, whirling wind that moves in a narrow path over land
Tornadoes!
Violent, whirling wind that moves in a narrow path over land
Fun Facts:
The most powerful Tornadoes occur in the United States.
A typical tornado only lasts for a few minutes.
Every tornado has its own color, sound and shape.
You need to step on the pedal of a car pass 70 miles per hour to outrun the fastest tornadoes.
The chances that a tornado is a F5, the highest classification for a tornado on the F-scale, is less than 0.1% (this just occurred!)
Tornadoes have been reported in every state in the US and also in every season.

6. Hurricanes
Hurricane: Atlantic and East Pacific Typhoon: West Pacific Cyclone: Indian Ocean Intense Low-Pressure Systems Need 60 m (200 feet) of ocean water at 26.5 C or warmer to form Winds of at least 119 km/hour

7. Blizzard
A winter storm with strong winds, cold temperatures, and low visibility, that lasts more than three hours

8. A WARNING means that severe weather conditions already exist
A National Weather Service WATCH means conditions are favorable for severe weather to develop
A WARNING means that severe weather conditions already exist

9. Vortex Demo Where are most of the glitter and beads?
Where is the movement of the glitter and beads the fastest? Where is it the slowest?
How is the vortex model like a real tornado? How is it like a hurricane?

10. Reflect
What happened when you first held the model so that the water was in the top of the bottle? Why do you think this happened? Draw a picture of your results
How did you get the water to flow quickly into the bottom bottle?
How did the motion of the glitter and beads change as they moved closer to the center of the spiral?
Think about your model as a tornado. What might the glitter and beads represent? What does their movement tell you about the movement of air within a rotating storm?
Think about your model as a hurricane. What do you think causes clouds of a hurricane to spiral?

11. Test Day
Take out your Blue Packet, Dictionary, and other Meteorology notes

12. Word Bank 44-55 Air Pressure Dew point Front Cirro Temperature Stratus
Wind
Precipitation
Humidity
Tornadoes
Clouds
Full of Water

13. Closure
Look at the 3 pictures: Identify the storms. What clues helped you classify each storm?, List the specific characteristics that led to the identification.