Transcript Dew point
DO NOW 1. Please check your Chapter 1 test for errors. If you have any questions or mistakes, please raise your hand. 2. If you have any last minute questions about tomorrow’s test, please write them on the scrap paper on your table and put them in the bucket on my desk. (35 MC and 4 Open Ended, 100 points) 1.) Relative Humidity & Dew Point • Relative humidity -amount of water vapor that the air contains relative to the maximum amount the air can hold at a given temperature. • Dew point - temperature to which air must cool to be saturated. 2.) Condensation & Precipitation • Condensation –change from gas to a liquid. • Precipitation- is water that falls from the atmosphere to the Earth. 3.) Air Mass & Front • Air mass- large body of air that has the same moisture & temperature throughout. • Front- the boundary between two air masses. 4.) Lightning & Thunder • Lightning - large electric discharge that occurs between two oppositely charged surfaces. • Thunder - the sound that results from the rapid expansion of air along a lightning strike. 5.) Tornado & Hurricane Tornado • • • • • Forms over land <1 mile wide Last for less than an hour Travel <15 miles Very unpredictable Hurricane • • • • • Forms over water 100s of miles wide Last for up to several weeks Travel 1000s of miles Very predictable 6.) The process in which water changes from a liquid to a gas is called: A.) Precipitation B.) Condensation C.) Evaporation D.)Water Vapor 7.) What is the relative humidity of air at its dew point? A.) 0% B.) 50% C.) 75% D.) 100% 8.) Which of the following is NOT a type of condensation? A.) Fog B.) Cloud C.) Snow D.) Dew 9.) High clouds made of ice crystals are called clouds. A.) Stratus B.) Cumulus C.) Nimbostratus D.) Cirrus 10.) Large thunderhead clouds that produce precipitation are called A.) Nimbostratus B.) Cumulonimbus C.) Cumulus D.) Stratus 11.) Strong updrafts within a thunderhead can produce A.) Snow B.) Rain C.) Sleet D.) Hail 12.) A maritime tropical air mass contains A.) Warm, wet air B.) Cold, moist air C.) Warm, dry air D.) Cold, dry air 13.) A front that forms when a warm air mass is trapped between cold air masses A.) Stationary Front B.) Warm Front C.) Occluded Front D.) Cold Front 14.) A severe storm that forms as rapidly rotating funnel cloud is called a A.) B.) C.) D.) Hurricane Tornado Typhoon Thunderstorm 15.) Explain the relationship between condensation and dew point. Air must cool to a temperature below its dew point before condensation can occur. 16.) Describe the conditions along a stationary front • Stationary fronts generally bring many days of cloudy weather. 17.) What are the characteristics of an air mass that forms over the Gulf of Mexico? • An air mass that forms over the Gulf of Mexico is warm and wet. 18.) Explain how a hurricane forms. 1. Begins as a group of thunderstorms from cumulonimbus clouds traveling over tropical ocean waters - Tropical Disturbance 2. Winds traveling in two different directions meet and cause the storm to spin – Tropical Depression (wind speeds less than 34 knots. No eye) 3. A group of thunderstorms form and produce a large, spinning storm called– Tropical Storm – wind speeds 34-64 knots. Sometimes has an eye. 18.) Hurricane forms (Continued) 4. Storm picks up strength as it travels over warm water (moist air) It becomes a Hurricane (wind speeds > 64 knots. Has an eye) 5. When they move over cold water or land they lose energy. 19.) Describe the water cycle, and explain how it affects weather. The water cycle is the continuous movement of water from the Earth’s surface, to the air, and back to the surface. Weather is affected by evaporation, Condensation, and precipitation of water in the air. 20.) Similarities & differences between hurricanes & tornadoes. Tornado • • • • • Forms over land <1 mile wide Last for less than an hour Travel <15 miles Very unpredictable • • • Result of thunderstorms Cumulonimbus clouds Centered around low pressure. Hurricane • Forms over water • 100s of miles wide • Last for up to several weeks • Travel 1000s of miles • Very predictable 21.) Explain how a tornado forms 1. Wind moving in 2 directions causes a layer of air in the middle to begin to spin like a roll of toilet paper. 2. The spinning column of air is turned to a vertical position by strong updrafts of air in the cumulonimbus cloud. The updrafts of air also begin to spin. 3. The spinning column of air moves to the bottom of the cumulonimbus cloud and forms a funnel cloud. 4. The funnel cloud becomes a tornado when it touches ground. 22.) Describe an interaction between weather and ocean systems. • Evaporating ocean water fuels hurricanes in tropical regions. 23.) List two ways to keep yourself informed during severe weather. • TV • Radio 24.) Explain why staying away from floodwater is important even when the water is shallow. • Even shallow water can be dangerous if moving quickly. 25.) In air temp. & amount of water vapor in the air change, is it possible for the relative humidity to stay the same? • If air temperature rises, then the air can hold more water. • If vapor content in the air also increases, then relative humidity could stay the same. 26.) What can you assume about the amt. of water vapor in the air if there is no difference between the wet- & dry-bulb readings of a psychrometer? • It can be assumed that the relative humidity is 100% because no water evaporated. 27.) Explain why the concept of relative humidity is important to understanding weather. • Precipitation can occur only when the air is saturated, which is when the relative humidity is 100%. 28.) Where are thunderstorms most likely to occur? Explain your answer. • Thunderstorms are most likely to occur in Chicago because a cold front is approaching. 29.) What are the weather conditions in Tulsa, Oklahoma? Explain your answer. • Tulsa is experiencing a stationary front and is probably receiving drizzly precipitation. ANY OTHER QUESTIONS???