Monday, April 4 th Entry Task- on ISN 71 For problems 1-3, Decide if the statements are true. If they are write them out as is. If they are false, correct the statement. 1.The gas that varies from 0%-4% in Earth’s atmosphere is nitrogen. 2.The Coriolis effect influences air motion across Earth’s surface 3.The changing of a gas to a liquid is evaporation. Problem 4, answer IQIA 4. Based on the reading/RSG you did for 17.1, why do you think we are reviewing the above information? Schedule: 17.1 notes Homework: None Objective: ISN 71- I can understand that weather changes as air masses move ISN 73- I can understand that a front is a boundary between air masses Please have on desk: 17.1 RSG (ISN 70)

Air Mass Air Mass – a large volume of air in which temperature and humidity are nearly the same in different locations at the same altitude.

Air masses are formed when a large bunch of air sits over a part of the planet for several days. In the US, the 4 main air masses always have two names one for moisture one for temperature.

Continental Maritime Continental OR Maritime describe the moisture of the air mass. Tropical Polar Tropical OR Polar describe the temperature of the air mass.

Air masses come from different areas on Earth. Such as: – Deserts – Tropical regions – Even at the poles! The area where the mass originates is called the source region.

– Continental means it was formed over land (See the word “continent” in there? Hint!) – Maritime means it was formed over water. (See “marine?”) -Tropical means it was formed around the equator (within 25°N or S latitude) -Polar means it was formed close to the poles

If an air mass stays over it’s source region it’s more likely to pick up it’s characteristics. Air masses can stay put and control the weather for periods of time from days to up to months

Global winds can cause air masses to move from the region in which they were formed. Once an air mass begins to travel away from the source region, it will start to pick up the characteristics of what it is traveling over. Fast moving air masses may not change; slower moving air masses may change. Who knew there was a day celebrating ME?!!

Tuesday, April 5 th Entry Task Be ready to be randomly called on to answer the following questions. 1.What do you call an air mass that – is cold and dry – is warm and dry – is cold and wet – is warm and wet 2.What do you call the place that an air mass originates? 3. How do air masses move? Schedule: Fronts (ISN 73) Objective: I can understand that a front is a boundary between air masses Homework Finish ISN 72

front A front is a boundary between air masses. (different fronts cause different weather patterns)

Cold vs Warm Fronts cold front A cold front forms when a cold air mass forces warm air to rise; forms tall clouds. warm front A warm front forms when a warm air mass pushes a cold air mass; forms flat clouds.

cold front A cold front forms when a cold air mass forces warm air to rise; forms tall clouds. These travel pretty fast. 1.The warm air gets quickly pushed up by the cold air mass. This causes the atmosphere to become unstable 2.The rapidly cooled water vapor from the warm air condenses and forms tall cumulonimbus clouds. 3.Thunderstorms usually occur. ( rain) What a cold front looks like: In the winter, a cold front may cause the temp to drop a lot. In the summer, cold fronts produce drier, cooler air Cold Front

warm front A warm front forms when a warm air mass pushes a cold air mass; forms flat clouds. These happen more gradually over time. 1.Warm air slowly rises over and replaces the colder, denser air 2.The air along the border of the two air masses, the warm air condenses to creating a blanket of clouds in the sky. 3.Warm fronts bring with them extended periods of rain, sleet or snow. What a warm front looks like: As it approaches, high cirrus then high stratus clouds form. The clouds will get lower and lower Many hours of precipitation ( think PNW in the winter.) Warm Front

Similarities between Warm and Cold fronts Use this time to discuss what Warm and cold fronts have in common Both can bring rain Both move from E to W Both change in temp and weather conditions Both are boundaries between two contrasting air masses

stationary front A stationary front occurs when two air masses push against each other. There is a lack of air mass movement for a period of time. 1.The air in the cold and warm air masses may still move side to side 2.But for the most part it just stays “stationary” ( no movement) What a stationary front looks like: Cloudy skies Stationary Front

high pressure system A high pressure system is formed when air moves all the way around a high-pressure center. When a high pressure-system stays in one location for a long time, an air mass may form.

low pressure system A low pressure system is a large weather system that surrounds a center of low pressure. It begins as air moves around and inward toward the lowest pressure and then up to higher altitudes.

Fronts and Pressure Systems ISN 72 High and Low Pressure Systems

Wednesday, April 6 th Entry Task Share your homework with your neighbor. Add anything to your fronts and pressure systems diagrams that needs to be added. Schedule: Storms (ISN 75) Objective: (ISN 75) I can understand that low pressure systems and vertical air motion can cause storms Homework Read/RSG 17.2 and 17.3 Please have on desk: ISN 72

Thursday, April 7 th Entry Task On ISN 74 Answer the following questions using full sentences, IQIA. 1.Where and when do hurricanes form? 2.What conditions produce thunderstorms? 3.How do tornadoes form? Schedule: Storm Video (ISN 74) Homework: Notebook Check tomorrow Pages Objective: (ISN 74) I can understand important information about storms Please Have on Desk: ISN 75

Friday, April 8th Entry Task Get your notebook ready for the check. It is on pages Schedule: Notebook Check Storm video Homework Have a wonderful break! Objective: I can learn about different types of storms Please have on desk: Notebook