Chapter 18 - Fronts and Frontal Depressions

Question 1

Where would you find freezing rain in a front?

Answer 1

In the cold air mass between the 0degC isotherms in each air mass.

Question 2

What is the location of the NH polar front in the north atlantic in summer and winter?

Answer 2

In summer it is said to connect Florida and Folkestone.

In winter it is said to connect Newfoundland to north Scotland.

Question 3

What are frontal waves?

Answer 3

The final stage when a quasi-stationary front turns into a moving frontal system.

Question 4

What is the slope of a cold front in relation to it’s frontal depth?

Answer 4

Around 1:50

Question 5

When you cross a cold front from warm to cold air what does the wind do?

Answer 5

It veers in the NH.

Question 6

In terms of pressure on a pressure chart, what feature do all fronts corrospond to?

Answer 6

A trough.

Question 7

What is the slope of a warm front in relation to it’s frontal depth?

Answer 7

Around 1:150

Question 8

When a warm front passes a location does pressure rise or fall?

Answer 8

It falls

Question 9

When a cold front passes does pressure rise or fall?

Answer 9

it rises.

Question 10

What kind of hazards to aircraft are associated with fronts?

Answer 10

Icing

Trace and light rime icing in AS

Moderate mixed rime and clear icing in NS

Rain ice at warm front

Question 11

What are some loacations of turblence at a front?

Answer 11

Slight to moderate in warm front zone

Wind shear at fronts

CB at cold front gives severe turbulence

CAT around jet streams.

Question 12

How fast does a warm front travel?

Answer 12

The same speed as surface flow.

Question 13

How fast does a cold front travel?

Answer 13

The speed of the free flow wind.

Question 14

When is an occlusion classified as a cold occulusion?

Answer 14

When the air behind the cold front is colder than the air ahead of a warm front.

And the occlusion follows the arc of the cold front on a pressure chart.

from cross section, Y warm?

Question 15

When is an occlusion classified as a warm occulusion?

Answer 15

When the air ahead of the warm front is colder than the air behind the cold front.

And the occlusion follows the arc of the warm front on a pressure chart.

From cross section, Y warm?

Question 16

Where is a frontal depression located?

Answer 16

Where the cold and warm front meet.

Question 17

How fast does the frontal depression move and what direction?

Answer 17

The direction and speed of the winds in the warm sector.

Question 18

Which 2 fronts only occur in the winter?

Answer 18

The arctic front (at high latitudes)

The Mediterranian front (when theres a warm low along the Med)

Question 19

What is meant by a very active cold front?

Answer 19

Pressure will suddenly drop and then proceed to rise as normal.

Isobars are skewed further into a sharp trough.