According to the data, what type of breeze would I be experiencing? Why? 1. Science Starter

Which temperature contains the least amount of water vapor? A.B.C.D. 2.

After using the sling psychometer, Mrs. Tindall gets a dry bulb reading of 4°C and a wet bulb reading of 0°C. What is the relative humidity in the room? A. 100% B. 56% C. 45% D. 42% 3.

Science Starter Which direction is the warm front on the map below moving? 2.Is Idaho experiencing rain or clear skies? Why? 3.Compare and describe the temperatures in Mississippi and Oklahoma. Explain your answer. OKOK ID MS

State Objectives 4.c, 4.e, 4.h.

The Water Cycle Earth’s surface is about 70% water and it exists in all three states. The water cycle is the constant movement of water on Earth. The Sun provides the energy for the water cycle.

Parts of the Water Cycle 1. Evaporation occurs when water changes from a liquid into a gas after gaining heat energy from the Sun. 2. Transpiration is the evaporation of water from the leaves of plants.

Parts of the Water Cycle 3. Condensation occurs when water vapor changes into liquid water to form clouds or fog. 4. Precipitation occurs when water droplets fall to Earth.

What is an Air Mass? An air mass is a large body of air with relatively uniform (same) temperature and moisture characteristics. Air masses take on the characteristics of the atmosphere over where it develops (or originates).

4 major types of air masses Continental polar Maritime polar Maritime tropical Continental tropical

Air forms over Alaska and Canada. This air is typically cold and dry.

The light blue arrows represent the movement of continental polar air masses.

Air builds up over the northern oceans. This air mass is cool and humid.

The green arrows represent the movement of maritime polar air masses. Notice that this air mass forms in two different areas.

Air forms over the warm water of the Gulf of Mexico. These air masses are typically warm and humid.

The pink arrows represent the movement of maritime tropical air masses. Notice that this air mass forms in three different areas.

Air forms over the deserts of the Southwest and Mexico. These air masses give the Southwest its hot and dry climate.

The red arrows represent the movement of continental tropical air masses.

Which air mass is it? Based on the humidity and temperature, what type of air mass is represented? FYI… High Humidity = or > 60% Hot Temp = or > 75 °F HumidityTemp. 38%29°F 88%97°F 73%34°F 26%101°F

Fronts A front is a boundary between two air masses. When two fronts meet, the cold air mass will move under the warm air mass because the cold air is more dense. (Kind of like ocean crust will subduct under continental!)

Types of Fronts 1. A cold front forms when a cold air mass pushes under a warm air mass. Cumulus clouds form and thunderstorms may occur. 2. A warm front forms when a warm air mass moves up and over a cold air mass. Cirrus and stratus clouds form and light, steady precipitation occurs.

What happens during fronts… Warm and Cold Fronts

Types of Fronts 3. A stationary front forms when a warm air mass meets a cold air mass but neither advances. 4. An occluded front forms when a fast- moving cold air mass overtakes a slower warm air mass. Weather is similar to, but less severe than, the weather along a cold front.

Warm and Cold Fronts WARM FRONT COLD FRONT More warm and cold fronts

Stationary and Occluded STATIONARY OCCLUDED Animation

Meteorologists A scientist that studies the weather & uses the data to make predictions about weather. Observe patterns & create weather maps A weather forecast is a prediction of present conditions based on observations and data.

Weather Maps Satellite map: allow meteorologists to monitor weather on the global scale Radar Map: uses electromagnetic waves to monitor velocity and altitude; used to monitor local weather

Types of Maps

Weather Map Symbols

How does the wind direction change from picture 1 to picture 3? What does this indicate?

Weather Map Symbols HIGH PRESSURE SYMBOL LOW PRESSURE SYSTEM

For your Weather Webquest… USE FIREFOX OR GOOGLE CHROME!!!! Login and go to my website. Click on Assignments. Click on Weather Webquest. Use the online webquest to manuever to the different sections. When finished, logoff computer and return it to the cart. (Make sure to put it in correct slot and plug it in.) If ALL of the computers are not plugged in when the bell rings, you WILL NOT leave until they are. Pick up both Front Worksheets off my desk and begin completing those.