1. In which direction do most tornadoes spin, clockwise or counter-clockwise?

2. A period of unusually warm, calm, hazy weather that follows the first freeze, usually in late October or early November is called an "_________"

3. In which part of the hurricane are wind speeds the strongest?
a) southeast b) northwest c) northeast d)southwest

4. What causes the swept-looking anvil top of a mature thunderstorm?

5. Per square mile, which state encounters the most tornadoes?

6. What is the average number of thunderstorms occurring on earth at any one time?

7. What causes the greatest damage when a hurricane makes landfall? a) high winds b) tornadoes c) storm surge

8. How fast does an average raindrop fall? _____mph

9. Chicago, Illinois is the windiest city in the United States.
True or False

10. How long does sunlight take to reach earth from the sun?
a) 37 minutes b) 3 hours 41 minutes c) 8.5 minutes

11. What causes the seasons?
a) the sun's energy fluctuations b) changes in distance from the sun c) the tilt of the earth

12. Due to the Coriolis effect, the jet stream generally flows from west to east. True or False

13. How many states in the contiguous U.S. have never encountered a tornado?

14. Which month of the year has the most tornadoes?
a) April b) May c) June

15. Which is heavier, dry air or damp air?

16. Who discovered the Doppler effect, the principle which current weather radar is based on?

17. Strong updrafts in a thunderstorm form hailstones, what velocity is necessary to support a hailstone three inches in diameter?
a) 55 mph b) 75 mph c) 100 mph

18. What part of a hurricane has the lowest barometric pressure?

19. In thunderstorms with tops greater than 40,000 feet, what does the cloudtop consist of?

20. In which direction does forked lightning travel?
a) down b) up c) both directions



Answers Below:

1. 90% of tornadoes spin counterclockwise. Most meteorologists believe that the Coriolis effect is not responsible for the direction of rotation, but possibly from the mesocyclone in the parent storm cell.

2. Warm temperatures occurring after the first freeze in the fall is called "Indian Summer"

3. The upper-left or northwest quadrant of a hurricane contains the strongest winds.

4. The anvil-looking top is caused by ice crystals that are sheared off the top of a cumulonimbus by high speed winds in the upper atmosphere.

5. Oklahoma endures the most tornadoes, with parts of the state experiencing 3-4 tornadoes per 2,500 square miles.

6. On average, there are 1,800 thunderstorms occurring at any one time with 45,000 thunderstorms rumbling over the course of one day.

7. When a hurricane makes landfall, the storm surge causes the most damage due to flooding, especially if it occurs at high tide.

8. An average raindrop falls at 7 mph, with a top speed of 14 mph.

9. Chicago, Illinois is not the windiest city in the United States, it is not even in the top 10.

10. Sunlight reaches the earth in 8.5 minutes.

11. The earth's seasons are caused by the tilt of the earth. More direct sunlight in the spring and summer causes warmer temperatures and the opposite occurs in winter.

12. True. The Coriolis Effect does cause the jet stream to move from west to east.

13. None. All 48 contiguous states have experienced tornadoes.

14. Tornadoes most frequently occur in May.

15. Dry air is heavier. A molecule of oxygen or nitrogen (dry air) is heavier than a molecule of water vapor (damp air). So, the more water vapor, the lighter the air.

16. In 1842 Christian Doppler discovered that the whistle of a train approaching a location had a higher-pitched frequency than the same whistle moving away from a location. Today's Doppler radar measures wind speed, distance, direction and speed of travel towards and away from a radar site.

17. A 100 mph updraft is necessary to form a 3-inch diameter hailstone.

18. The lowest barometric pressure in a hurricane occurs in the eye.

19. Cloudtops above 40,000 feet consist of ice.

20. Forked lightning travels in both directions, from cloud-to-ground, and ground-to-cloud.

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