Weather and Climate Chapter 2: Understanding Weather

Mrs. Fantuzzo2008-2009

DO NOW:List the four parts to the water cycle.

DO NOW:List the four parts to the water cycle.

Section 1: ObjectivesExplain how water moves through the water cycle.

Describe how relative humidity is affected by temperature and levels of water vapor.

Describe the relationship between dew point and condensation.

List three types of cloud forms.

Identify four kinds of precipitation.

Explain how water moves through the water cycle.We need to understand 4 terms:

Precipitation- Runoff-Evaporation-Condensation-

Explain how water moves through the water cycle. Precipitation

Def: occurs when rain, snow, sleet, or hail falls from the clouds onto Earth’s surface.

RunoffDef: Water, usually

from precipitation, that flows across land, and collects in rivers, streams, and eventually the ocean.

EvaporationDef: occurs when

liquid water changes into water vapor, which is a gas.

CondensationDef: occurs when

water vapor cools and changes from a gas to a liquid. Clouds form by this process.

Describe how relative humidity is affected by temperature and levels of water vapor.First we need to understand these terms:

Humidity- the amount of water vapor in the air

*The airs ability to hold water vapor depends on the temperature.

As temp. INCREASES, the amount of water vapor that can be held in the air INCREASES.

Relative Humidity- the ratio of the amount of water vapor in the air to the maximum amount of water vapor the air can hold at a set temperature.

Describe how relative humidity is affected by temperature and levels of water vapor.

SATURATED UNSATURATED

Describe how relative humidity is affected by temperature and levels of water vapor.Sample Problem

1. Count the number of people in the room _____2. Count the number of seats in the room _____

How saturated is our classroom today?Number of people in the room x 100 = %

of saturationNumber of seats in the room

Describe how relative humidity is affected by temperature and levels of water vapor.Math Practice

Assume that 1 m3 of air at 25 C contains 11 g of water vapor. At this temperature, the air can hold 24 g/m3 of water vapor. Calculate the relative humidity of the air.

Formula:Actual water vapor content (g/m3) x 100= Relative Humidity (%)Saturation water vapor content (g/m3)

Describe the relationship between dew point and condensation.Mini Experiment on Wednesday

List the three types of cloud formsCumulus- puffy, white clouds; flat bottoms

Altocumulus- (middle altitude cumulus clouds)Cumulonimbus- (cumulus clouds that produce precip.)Stratocumulus- (mixture of stratus/cumulus)Cirrocumulus- (high altitude cumulus clouds)

Stratus- layered, cover a lot of areaNimbostratus- (stratus clouds that produce precip.)Stratocumulus- (mixture of stratus/cumulus)Altostratus- (middle altitude stratus clouds)Cirrostratus- (high altitude stratus clouds)

Cirrus- made of ice crystals; only found in high altitudes

List the three types of clouds

List the three types of clouds

Cumulus

CirrusCumulonimb

us

Stratus

Stratocumulus

Identify four types of precipitation

Homework Options1. Create a cloud model- using cotton balls

make a model of at least 4 different cloud combinations. Include labels!

2. On paper, recreate Figure 6 on page 43. Include all labels and definitions of each cloud type and prefix.

3. Write a short story describing the travel of a water molecule from the moment it evaporates to the moment it returns to the sea. Include a picture if you wish.