250 hpa and high level prog charts

Question 1

Jet streams are usually found:

Answer 1

10-15km above the earth’s surface

Question 2

Is the jet stream stronger in the winter or summer? why?

Answer 2

Winter. there is a stronger surface temperature contrast

Question 3

We say that jet streams are of _________ origin

Answer 3

thermal

Question 4

the thermal wind is oriented with ______ to the left and ________ to the right

Answer 4

cold air

warm air

Question 5

In order for a current to be classified as a jet stream, each point on its axis must have a minimum speed of

Answer 5

60kts

Question 6

What are the speeds of a weak, moderate and strong jet stream

Answer 6

weak = <120kts
moderate = 120-150 kts
strong = >150kts

Question 7

Define horizontal wind shear

Answer 7

The difference in wind speed over a horizontal distance, measured in a direction perpenducular to the current.