Question

what are jet streams?
the polar easterlies, prevailing westerlies, and trade winds are all winds that we feel on the ground. however, wind systems can also form at high altitude. jet streams are narrow belts of very high - speed winds in the upper troposphere and lower stratosphere. they blow from west to east all the way around the earth.
jet streams can reach speeds of 400 km/h. pilots flying east over the united states or the atlantic ocean try to catch a jet stream. this wind pushes airplanes along, helping them fly faster and use less fuel. pilots flying west try to avoid the jet streams.
the global wind systems are always found in about the same place every day. unlike these global wind systems, jet streams can be in different places on different days. because jet streams can affect the movements of storms, meteorologists try to track the jet streams. they can sometimes predict the path of a storm if they know where the jet streams are.
reading check

1. identify in what two layers of the atmosphere are the jet streams found?

take a look

1. infer why would a pilot flying across north america take a different route on tuesday than on monday?

Explanation:

1. The text states that jet - streams are found in the upper troposphere and lower stratosphere.
2. Jet - streams can be in different places on different days. Pilots flying east try to catch a jet - stream to fly faster and use less fuel, and those flying west try to avoid it. So, a pilot flying across North America may take a different route on Tuesday than on Monday to either catch or avoid the jet - stream depending on its position.

Answer:

1. Upper troposphere and lower stratosphere.
2. Because the position of the jet - stream may be different on Tuesday than on Monday, and pilots adjust their routes to either catch (if flying east) or avoid (if flying west) the jet - stream for efficiency in speed and fuel consumption.