do now understanding weather. assuming the amount of water vapor in the air stays the same 1. what...

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DO NOW Understanding Weather

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Assuming the amount of water vapor in the air stays the same 1. Relative humidity is the amount of moisture in the air compared to the amount of moisture the air can hold at that temperature. 2. What happens to relative humidity if the temperature increases? – decreases 3. What happens to relative humidity if the temperature decreases? – increases

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Page 1: DO NOW Understanding Weather. Assuming the amount of water vapor in the air stays the same 1. What is relative humidity? 2. What happens to relative humidity

DO NOW Understanding Weather

Page 2: DO NOW Understanding Weather. Assuming the amount of water vapor in the air stays the same 1. What is relative humidity? 2. What happens to relative humidity

Assuming the amount of water vapor in the air stays the same

• 1. What is relative humidity?

• 2. What happens to relative humidity if the temperature increases?

• 3. What happens to relative humidity if the temperature decreases?

Page 3: DO NOW Understanding Weather. Assuming the amount of water vapor in the air stays the same 1. What is relative humidity? 2. What happens to relative humidity

Assuming the amount of water vapor in the air stays the same

• 1. Relative humidity is the amount of moisture in the air compared to the amount of moisture the air can hold at that temperature.

• 2. What happens to relative humidity if the temperature increases?– decreases

• 3. What happens to relative humidity if the temperature decreases?– increases

Page 4: DO NOW Understanding Weather. Assuming the amount of water vapor in the air stays the same 1. What is relative humidity? 2. What happens to relative humidity

Dew Point

• What is Dew Point?• When is air saturated?• What happens if the temperature of the air is

the same as the dew point? (remember the LAB!)

Page 5: DO NOW Understanding Weather. Assuming the amount of water vapor in the air stays the same 1. What is relative humidity? 2. What happens to relative humidity

Dew Point• What is Dew Point?

– the temperature at which a gas condenses to a liquid (or water vapor becomes water)

• When is air saturated?– air is saturated when it has a relative humidity of

100% which means dew point has been reached• What happens if the temperature of the air is the

same as the dew point? (remember the LAB!)– water vapor will condense and form a liquid, or dew! – in the atmosphere water vapor will condense on a

dust particle and become a cloud

Page 6: DO NOW Understanding Weather. Assuming the amount of water vapor in the air stays the same 1. What is relative humidity? 2. What happens to relative humidity

Air Masses

• Continental means wet or dry?• Maritime means wet or dry?• Polar means warm or cold?• Tropical means warm or cold?• What is the boundary between air masses

called?

Page 7: DO NOW Understanding Weather. Assuming the amount of water vapor in the air stays the same 1. What is relative humidity? 2. What happens to relative humidity

Air Masses• Continental means wet or dry?

– dry• Maritime means wet or dry?

– wet• Polar means warm or cold?

– cold• Tropical means warm or cold?

– warm• What is the boundary between air masses called? A

front

Page 8: DO NOW Understanding Weather. Assuming the amount of water vapor in the air stays the same 1. What is relative humidity? 2. What happens to relative humidity

What is a cloud made of?

Page 9: DO NOW Understanding Weather. Assuming the amount of water vapor in the air stays the same 1. What is relative humidity? 2. What happens to relative humidity

What is a cloud made of?

• Water droplets condensed on dust particles in the air

Page 10: DO NOW Understanding Weather. Assuming the amount of water vapor in the air stays the same 1. What is relative humidity? 2. What happens to relative humidity

A. B. C. D. A. .

1. Which symbol belongs to which front?2. What color is each front symbol?

3. What type of weather does each front bring?

Check your Fronts Chart for answers to the weather each front brings.

Page 11: DO NOW Understanding Weather. Assuming the amount of water vapor in the air stays the same 1. What is relative humidity? 2. What happens to relative humidity

A. B. C.

Warm front

A. .

1. Which symbol belongs to which front?2. What color is each front symbol?

3. What type of weather does each front bring?

Check your Fronts Chart Study Guide for answers to the weather each front brings.

Occluded front

Cold front

Stationary front

Page 12: DO NOW Understanding Weather. Assuming the amount of water vapor in the air stays the same 1. What is relative humidity? 2. What happens to relative humidity

Be able to answer the following:

• 1. If you see these clouds in the sky what do they look like and what weather can you expect?– Cumulus– Cumulonimbus– Cirrus– Stratus

Page 13: DO NOW Understanding Weather. Assuming the amount of water vapor in the air stays the same 1. What is relative humidity? 2. What happens to relative humidity

Be able to answer the following:

• 1. If you see these clouds in the sky what weather can you expect?– Cumulus – white puffy; fair weather– Cumulonimbus – thunderhead – thunderstorm w

possible hail which forms in cold front– Cirrus – ice crystals; rain in 24 – 48 hrs.– Stratus- flat layered that form in a warm front and

bring gentle steady rain

Page 14: DO NOW Understanding Weather. Assuming the amount of water vapor in the air stays the same 1. What is relative humidity? 2. What happens to relative humidity

Air Masses

A.

B.

C.

D.

E.

F.

G. What is the origin of each of the

3 mT air masses?

Page 15: DO NOW Understanding Weather. Assuming the amount of water vapor in the air stays the same 1. What is relative humidity? 2. What happens to relative humidity

Air Masses

A. mP

B. cP and/or cA

C. mP

D. cT

E. mT

F. mT

G. What is the origin of each of the 3 mT air masses?Pacific, Gulf of Mexico and Atlantic

Page 16: DO NOW Understanding Weather. Assuming the amount of water vapor in the air stays the same 1. What is relative humidity? 2. What happens to relative humidity

Cold Air Masses• What kind of weather does a cP air mass bring

in the summer?• What kind of weather does a cP air mass bring

in the winter?• What kind of weather does an mP air mass

bring in the summer?• What kind of weather does a mP air mass

bring in the winter?

Page 17: DO NOW Understanding Weather. Assuming the amount of water vapor in the air stays the same 1. What is relative humidity? 2. What happens to relative humidity

Cold Air Masses• What kind of weather does a cP air mass bring

in the summer? Cool, dry

• What kind of weather does a cP air mass bring in the winter? Extremely cold winter weather

• What kind of weather does an mP air mass bring in the summer? Cool, foggy

• What kind of weather does a mP air mass bring in the winter? rain and snow in Pacific region; cool, cloudy w. rain or snow in Atlantic area

Page 18: DO NOW Understanding Weather. Assuming the amount of water vapor in the air stays the same 1. What is relative humidity? 2. What happens to relative humidity

Warm Air Masses

• What kind of weather does a cT air mass bring in the summer?

• What kind of weather does a cT air mass bring in the winter?

• What kind of weather does a mT air mass bring in the summer?

• What kind of weather does a mT air mass bring in the winter?

Page 19: DO NOW Understanding Weather. Assuming the amount of water vapor in the air stays the same 1. What is relative humidity? 2. What happens to relative humidity

Warm Air Masses

• What kind of weather does a cT air mass bring in the summer? clear, dry, hot

• What kind of weather does a cT air mass bring in the winter? Warm and dry

• What kind of weather does a mT air mass bring in the summer? Hot, humid, with possible hurricanes and thunderstorms

• What kind of weather does a mT air mass bring in the winter? Mild, often cloudy

Page 20: DO NOW Understanding Weather. Assuming the amount of water vapor in the air stays the same 1. What is relative humidity? 2. What happens to relative humidity

Think about it…

• Would a farmer prefer the rain from a warm front or a cold front to come through his area during the growing season?

• Explain why..

Page 21: DO NOW Understanding Weather. Assuming the amount of water vapor in the air stays the same 1. What is relative humidity? 2. What happens to relative humidity

Think About It

• Suppose you are planning an outdoor activity for tomorrow afternoon. You hear on the weather that a front is coming through tonight. With the understanding that you want to be outside tomorrow, which of the 4 fronts we learned about would you rather have come through?

• Fully explain why.