Lesson 404 - 250 hPa

Question 1

What altitudes are jet streams usually found?

Answer 1

10-15 km (33000-50000 ft)

Question 2

What are the normal dimensions of the jet stream?
L
W
T

Answer 2

Length: a few thousand km
Width: a few hundred km
Thickness: a few km

Question 3

What is the minimum speed of a current in order to be classified as a jet stream?

Answer 3

60 KT

Question 4

In a jet stream, PVA is in the _________ entrance and ________ exit, whereas NVA is in the _________ entrance and ________ exit of the jet.

Answer 4

PVA: Right, left
NVA: Left, right

Question 5

As a parcel moves into the left entrance or right exit of the jet core the vorticity values ________.
As a parcel moves into the right entrance or the left exit of the jet core the vorticity values ________.

Answer 5

Increase

Decrease

Question 6

At the left entrance and right exit ________ is found.

At the right entrance and left exit ________ is found.

Answer 6

Convergence

Divergence