The Norwood Science Center

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1 The Norwood Science Center Weather Grade 5 Background information: The jet stream is a relatively narrow band of strong winds found in the upper part of the atmosphere called the troposphereapproximately 10 to 15 kilometers above the ground. The location of the jet stream in the middle latitudes of the Northern Hemisphere is situated directly over the polar front - the boundary between the polar easterlies (cold air) and the prevailing westerlies (warmer air). This cold air/warm air boundary at the polar front sets the stage for winds that strengthen with increasing altitude until they reach a maximum strength near the upper troposphere. In fact, wind speeds in the jet stream can top 160 km/hr (100 mph). The jet stream in the middle latitudes travels in an easterly direction across North America. Westbound aircraft understandably avoid the jet stream because it is a head wind, whereas eastbound flights seek to benefit from it as a tailwind. Like the polar front, the jet stream undergoes important seasonal shifts. It strengthens in the winter as the polar easterlies move southward. Conversely, it weakens in the summer when the polar easterlies move northward and the temperature differences Mapping the Jet Stream G5 15 Page 1 of 5

2 between the easterlies and westerlies is less. The average summer location of the jet stream is across southern Canada while the average winter position is across southern United States. These positions are long-term averages; the jet stream actually weaves over a considerable range of latitude from week to week, and even from one day to the next. As a rule, when the jet stream is south of your location, the weather tends to be relatively cold and when the jet stream is north of your location, the weather tends to be relatively warm. Mapping the Jet Stream G5 15 Page 2 of 5

3 TITLE: PURPOSE: MAPPING THE JET STREAM Will I have a snow day tomorrow? MATERIALS: (per teacher) Interactive Jet Stream PowerPoint (per student) One Jet Stream Map Table 1 containing high altitude wind speeds Pencil PROCEDURE: 01. Distribute Jet Stream Maps. 02. Use Jet Stream Map overhead to discuss the call letters used for each location. 03. Distribute Table 1. Instruct students to locate San Francisco (SFO) on their map and copy the high altitude wind speed for that location onto their map. It might be helpful if they write as small as they can. 04. Have students continue copying all the other high altitude wind speeds for the various locations on their map. 05. Students will be connecting locations with the same wind speeds by using special lines called isotachs (iso- means same and -tach means speed). Emphasize to students that isotachs can never cross each other for if they did, it would indicate that there are two different wind speeds in the same location. Mapping the Jet Stream G5 15 Page 3 of 5

4 06. Guide students through the steps for drawing the 50-km/hr isotach. Demonstrate how to decide the location of a particular isotach by using surrounding wind speeds and lines. It may be helpful to place small marks to indicate proper spacing. These marks can be used later to draw other isotachs. 07. When all isotachs have been drawn and labeled, show students how to determine the location of the jet stream. Starting on the west coast, lightly sketch a smooth line that follows the strongest winds. Sketch the line all the way to the east coast drawing a line through all isotachs dividing them into equal right and left portions. 08. Emphasize that all locations to the north of the jet stream would be experiencing colder temperatures whereas locations to the south would be experiencing warmer temperatures. The location of the jet stream influences the temperature, wind direction, and precipitation that a particular area will experience. CONCLUSION: 01. Distribute graphics from the Boston Globe showing the jet stream locations for several days. 02. Ask students what the temperatures are to the north and south of the jet stream for one particular day. Have students observe these temperatures change daily with reference to the jet stream. Mapping the Jet Stream G5 15 Page 4 of 5

5 Table 1 Call High altitude wind speed Station letters (km/hr) Albuquerque, NM ABQ 60 Cape Hatteras, NC HAT 60 Caribou, ME CAR 60 Duluth, MN DLH 60 Glasgow, MT GGW 50 International Falls, MN INL 50 Kansas City, MO MKC 80 Miami, FL MIA 50 Nashville, TN BNA 80 New Orleans, LA NEW 60 New York City, NY JFK 60 Pittsburgh, PA PIT 80 Rapid City, SD RAP 70 Salt Lake City, UT SLC 60 San Francisco, CA SFO 50 Sault St. Marie,Ontario SSM 50 Seattle, WA SEA 50 Shreveport, LA SHV 70 Tucson, AZ TUS 50 Vald'Or, Quebec VO 50 Mapping the Jet Stream G5 15 Page 5 of 5

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