Chapter 11 - Upper winds

Question 1

What causes upper winds

Answer 1

When two air masses of different temperatures meet

Question 2

What causes the pressure gradient between two air masses

Answer 2

When the temperatures are different, the rate of pressure change upwards is different.
Cold pressure will be a lot lower for the same height as warmer.

Question 3

Isohypes are

Answer 3

lines of equal pressure above the surface

Question 4

Isotachs

Answer 4

Are lines of equal wind speed

Question 5

A jet stream is considered formed at and on SigWX charts at

Answer 5

60knots

80knots

Question 6

Sub tropical Jet is at FL, Latitude, direction, time of year

Which cells

Answer 6

400
30-40 N/S
West to East
all year round

Hadley + Ferrel

Question 7

Polar Front Jet is at FL, Latitude, direction, time of year

Answer 7

300
50-60 N/S
West to East
all year round

Ferrel + Polar

Question 8

Arctic Jet is at FL, Latitude, direction, time of year

Answer 8

200
70N (50N USA)
West to East
Winter Only

Question 9

Equatorial / easterly jet

Answer 9

500
10-20N
East to West
Summer Only

Land mass and water creates different temperatures

Question 10

Jet streams are how wide, deep and long

Answer 10

wide 200NM
Deep 2NM
Long 2000NM

Question 11

CAT (Clear Air Turbulence) is more severe where

Answer 11

On the cold side

Question 12

What is the ratio of jet stream sizes

Answer 12

1:100:1000