Link for this ppt: https://docs.google.com/presentation/d/1zNXSuYVIMHaBJBZmeDHccHDv0TY7u6t60o0Pb1m
Sample Jet Stream on a winter weekend for North America
(p. 548 in text)
● Slim bands of high-speed winds
1. Use the Jet Stream/Airplane Travel article and an internet search to find out how big and fast it is, plus the altitude at which it is found, and then write that for your answer to this question.
- Accurate speeds and altitude: http://bit.ly/1gleUHi
- Use the article to describe thickness and width of Jet Stream
- Great info on page 548 of text
Don’t confuse the weather-related Jet Stream with the ultra-high altitude
Jet Stream discovered by scientists in the 1960’s and discovered by me about 5 minutes ago (8 Mar, 2015) http://1.usa.gov/1Bm6RWR
● The Jet Streams are in our upper troposphere and lower 2.________sphere.
(the two lowest layers of the atmosphere.)
3. In which layer of the atmosphere do we live? (in book, or Google it)
4. Does a jet stream exist in the southern hemisphere? If so which way does it move? (might want to answer this one after you look at slide 8)
● Wherever the jet stream happens to be located is where FRONTS typically form.
● FRONTS bring our “weather” to us.
6. Draw pictures of the map symbols that represent a warm front, cold front, and stationary front, as they have been discussed in class (hope you kept your notes).
So if you want to know what the weather is going to be like, it can help if you first identify the type of front coming in, which can be partially determined by the
Jet Stream’s position.
Form as the result of density differences between cold polar air and warm air of middle latitudes.
7. COLD DOESN’T EXIST as a scientific definition, what should we write instead?
8. List 2 factors from your notes of our class discussion that contribute to the differential heating that makes polar regions generally colder than our latitude.
Complete this Classzone interactive (ES1906) on the jet stream and then answer the questions below: http://bit.ly/1MlLDx2
9. What do the AVERAGE positions of the jet stream in this picture show? Describe the picture in words, and draw your own version to support your description.
10. How do the 2 Jet Stream positions in the picture relate to our AVERAGE summer and winter weather in Michigan? (think!)
● Separate warmer subtropical air from cooler polar air.
11. Use your textbook to make a little data chart that lists the types of air masses and their average temperatures and moisture levels. (P. 576 in book)
● Polar Jet Streams move West to East b/c of Coriolis Effect in both the northern and southern hemispheres.
(p. 545 in text and slide 9)
● Recently, the Northern Polar Jet Stream has caused severe, extended duration cold temperatures in the Midwest and
( watch http://bit.ly/1E09VX9 and this interactive version of actual recent images of the Jet Stream: http://bit.ly/1Mjf7Kf )
● The Jet Stream is also combining with an El Nino event to warm much of Alaska.
( http://bit.ly/1E09VX9 and http://slate.me/1k4cwZ1 some predictions, like Chicago, Green Bay, and Toronto were wrong due to the unusual Jet Stream pattern this winter, our coldest ever)
Read about the Coriolis Effect in your textbook on page 545.
12. What is the Coriolis Effect?
13. What causes the Coriolis Effect?
14. In which direction do our LONG DISTANCE winds curve due to the Coriolis Effect?
15. Watch and describe these classzone animations: http://bit.ly/1A5ZQFY and http://bit.ly/1AUddZK
16. On page 547, you can see the wind circulation cells. Notice that the easterlies,
_________________, and trade winds move to the right of the direction of the wind in the circulation cells in the northern hemisphere. In which direction do those winds move in the southern hemisphere?_______________
17. P. 547: Does the pattern for the trade winds in the N and S hemispheres at the equator work well to keep them from “fighting” each other as they circle the globe?
18. P. 547: Which way do the trade winds go?
19. Why does the atmosphere get thicker (taller, not denser) when you move from the poles to the equator? (simplest reason, think about the air warming)
20. Looking back at the global winds on page 547, which ones “agree” with the path of the Jet Stream?
21. Knowing that they use the differential heating of the earth to form, what might happen to global circulation cells and wind belts if the temperatures of the earth’s surface waters and land temps change as part of climate change?
26. (I moved this slide up at the last minute) Colder air has been moving into Michigan lately. What is pulling that Arctic air down?
Temperature differences between the Arctic and Midwest temperatures makes a pressure field that confines the jet stream to a tight band around the Arctic
As the Arctic melts, the temp. difference is reduced.
● The meanders of the jet stream become more pronounced
(more noticeably sluggish and also bigger.)
● The more often those meanders occur, the more persistent the regional warmth where the jet stream pulls warm Gulf air northward, and regional cold where it pulls Arctic air south.
22. “What is a Subtropical Jet Stream?”
● Forms in subtropical regions where warm air meets cold air.
● Subtropical jet streams have little change in speed and/or direction throughout the year, and are not wavering anything like the Polar Jet Streams have done in the past, and certainly not like they are wavering for the past 2 years of unusual winters in the northern hemisphere.
Complete the Classzone on the “First
Successful Nonstop Balloon Flight around the
World”: http://bit.ly/182puEU (es 1908)
- Be sure to answer the 11 questions as you go along!!!
● AVIATION ORGANIZATIONS: Polar jet streams can cause issues with airplane routes
(possibly good or bad, based on direction of the plane and how strong the plane’s engines are.)
24. It also affects the paths of storms, so it’s of interest to. _____
25. Watch the video about Japanese bombs in WWII. (click on “Japanese”)