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Flashcards in Weather Deck (23):

1. On the Hurricane web quest, what happened to wind speed in hurricane Katrina as the pressure dropped?

When air pressure decreases, wind speed increases.


2. What type of weather change does a cold front bring?

A cold front brings heavy rain, storms, and cooler temperatures.


3. What type of weather change does a warm front bring?

A warm front brings steady precipitation and warmer temperatures.


4. What happens at a stationary & an occluded front?

Stationary Front - warm air mass meets cold air mass and neither advance.

Occluded Front - fast moving cold air mass overtakes a slower moving warm air mass.


5. How do you know the direction a front is moving?

What is different about the air on each side of the front? .

The side that the symbol is facing.

density & temperature


6. What type of weather is associated with a High (H) pressure system? Explain why.

A high pressure system brings clear weather because dry air is forced toward the ground


7. What type of weather is associated with a Low (L) pressure system? Explain why.

A low pressure system brings clouds and precipitation because air rises, cools, and condenses


8. How does the sun affect weather?

Warms the atmosphere, causes evaporation, & warms the ocean surface


9. How does relative humidity effect the chance for precipitation?

Warmer temperature holds more water vapor than Cooler temperature, so the more water vapor in the air compared to how much it can actually hold gives a greater chance of precipitation


10. What is a cumulonimbus cloud?

Thunderstorm clouds


11. What is temperature?

Speed of air molecules


12. What are the following weather instruments used for?

anemometer – wind speed
barometer – air pressure
hygrometer, psychrometer - relative humidity


13. What happens to a hurricane when it moves over land?

It gets weaker


14. What happens to a hurricane when it moves warm ocean water?

Gets stronger


15. What happens to a hurricane when it moves cool ocean water?

Gets weaker


16. What is the difference between westerlies & easterlies (trade winds)?

Westerlies blow from the west to east and cause hurricanes to turn away from United States.

Trade winds blow hurricanes from east to west toward the US.


17. What is the latitude line that divides the trade winds from the Westerlies?

30 degrees N latitude


18. List the 5 ingredients for a hurricane.

warm ocean water at least 80 degrees, high humidity, converging winds, low wind shear, at least 300 miles from equator


19. Identify what causes the deflection of air in the diagram below?

What is it called?

Earth’s rotation

Coriolis affect


20. Why doesn’t a hurricane form near the equator?

The Coriolis effect is not strong enough to cause the storm to rotate


21. List the order a storm grows to become a hurricane in order from weakest to strongest.

tropical disturbance, tropical depression, tropical storm, hurricane (Category 1-5)


22. What causes clouds & fog to form?

Water vapor cools to the dew point and condenses on particles in the atmosphere


23. What affect does altitude have on temperature in the troposphere?

Temperature decreases as attitude increases