Thinking Spatially Using ArcGIS OnlineModule 4: Lesson 21Module 4, Lesson 2Analyzing historical tornadoesMeteorologists study storms that produce tornadoes. They use tools such as forecasting (predicting theweather), research (observing and trying to understand the weather), and storm chasing (following andwatching storms close-up). Some tornadoes and tornado outbreaks may stick even in your memory. Some students grow up to study the science of tornadoes because of a personal experience or out of curiosity about a particular outbreak. Perhaps you will decide to be a meteorologist yourself one day!In this GIS activity, you will see how tornadoes are classified into weak, strong, and violent categories. You will also take a close look at some of the memorable tornado outbreaks in history.Let’s explore Tornado Alley.Task 1: Open the map1.If you do not intend to save your work:a)Launch an Internet browser.b)Go to this link:c)d)Skip Step 2 and proceed with the lesson.2.If you wish to save in a Public or Organization account, go to and follow the directions.A map document has been created for you to use in this exercise. When the map document opens, you see a map of the world. The ArcGIS Online Map Viewer title is in the top left corner of the window.
You see states in four regions of the United States. The States legend shows you the name of each region.3.Look at the ArcGIS Online map window and observe the following:On the right side you see a map.On the left side you see a column that displays the legend for the map.In the top right corner you will see a “Modify Map” link.4.Click on the Modify Map link.5.Look at the top of the ArcGIS Online map viewer window and notice the different buttons. You will use some of these buttons as you progress through this lesson.Task 2: Enlarge the ArcGIS Online windowIf the ArcGIS Online Map Viewer window is small when the map document first opens, you may wish toenlarge it.6.In the upper right corner (PC) or upper left corner (Mac) of your ArcGIS Online window thereare three buttons. Click the middle button (PC) or the right green button (Mac).PCMacNow the ArcGIS Online Map Viewer window fills your whole screen.
You can also change the size of your ArcGIS Online window by stretching it. Stretching the window instead of maximizing it allows you to organize other windows and dialog boxes as they appear.7.Place the cursor on any corner of the ArcGIS Online window that is not at the edge of yourscreen. The cursor changes to a diagonal double-headed arrow. Click and drag the windowoutward until the ArcGIS Online window fills about two-thirds of the screen. Let go of the mouse button.
Task 3: Tornadoes of the United States8.Hover over and click on Show Contents of Map button.
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