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BFS - Meteorology > C18 - Fronts and Frontal Depressions > Flashcards

C18 - Fronts and Frontal Depressions Flashcards

1
Q

What is a Warm Front?

A

Warmer Air displaces Colder Air.

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2
Q

What is a Cold Front?

A

Colder Air displaces Warmer Air.

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3
Q

Little movement of either Air Mass is called what?

A

Quasi-Stationary Front.

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4
Q

What is a Polar Front?

A

Boundary between Polar Maritime and Tropical Maritime.

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5
Q

What Latitudes can the Polar Front be found in the Northern Hemisphere (2)?

A
  • Summer = 65°N.

- Winter = 35°N

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6
Q

Where can you find the Polar Front in the Northern Hemisphere (2)?

A
  • Winter = Florida to UK.

- Summer = Newfoundland to North Scotland.

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7
Q

What is an Arctic Front?

A

Boundary between Arctic Continental and Polar Maritime/Continental.

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8
Q

Arctic Fronts may move to ‘____’ Latitudes in the Winter?

A

Lower.

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9
Q

What is the Mediterranean Front?

A

Boundary between Polar Continental and Tropical Continental.

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10
Q

When does the Mediterranean Front exists?

A

Winter.

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11
Q

True or False. Thunderstorms in the ITCZ can reach 45,000ft?

A

True.

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12
Q

What causes a Polar Front Depression?

A

Turbulence at the boundary between two airstreams.

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13
Q

In what direction does a Polar Front Depression move in?

A

West to East.

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14
Q

What are the Upper Winds in a Polar Front Depression?

A

Westerly.

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15
Q

What is the Frontal Slope of a Warm Front?

A

1:150.

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16
Q

How long is a Warm Front?

A

600-800 km.

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17
Q

What sequence of Cloud exists in a Warm Front?

A

Ci, Cs, As, Ns and St.

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18
Q

How in a Warm Front can Precipitation exist from the Frontal Surface Point?

A

200 nm.

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19
Q

How far does the general Weather in a Warm Front extend from the Frontal Surface Point?

A

5-700 nm.

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20
Q

In a Warm Front, the Geostrophic Wind blows ‘____’ to the Isobars with the Low on the ‘____’ in the Northern Hemisphere (2)?

A
  • Parallel.

- Left.

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21
Q

How can you calculate the Warm Front Speed?

A

2/3rds of the Geostrophic Wind Speed.

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22
Q

What happens to the Wind ahead of a Warm Front?

A

Increases and slightly Backs Southernly.

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23
Q

What happens to the Temperature ahead of a Warm Front?

A

Steady Low.

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24
Q

What happens to the Dew Point ahead of a Warm Front?

A

Steady Low.

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25
Q

What happens to the Pressure ahead of a Warm Front?

A

Steady Falls.

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26
Q

What happens to the Cloud ahead of a Warm Front?

A

Increasing to 8/8 with Ci, Cs, As, Ns and Sc.

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27
Q

What happens to the Precipitation ahead of a Warm Front?

A

Light continuous at As and moderate continuous at Ns.

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28
Q

What happens to the Visibility ahead of a Warm Front?

A

Decreases.

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29
Q

What happens to the Wind at the Warm Front?

A

Sharply Veers.

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30
Q

What happens to the Temperature at the Warm Front?

A

Rises.

31
Q

What happens to the Dew Point at the Warm Front?

A

Rises.

32
Q

What happens to the Pressure at the Warm Front?

A

Decreases Slightly.

33
Q

What happens to the Cloud at the Warm Front?

A

8/8 with Ns and St.

34
Q

What happens to the Precipitation at the Warm Front?

A

Moderate/Heavy Continuous.

35
Q

What happens to the Visibility at the Warm Front?

A

Very Poor, Fog can occur.

36
Q

What happens to the Wind in the Warm Sector?

A

Usually from the SW.

37
Q

What happens to the Temperature in the Warm Sector?

A

Steady.

38
Q

What happens to the Dew Point in the Warm Sector?

A

Steady.

39
Q

What happens to the Pressure in the Warm Sector?

A

Decreases Slightly.

40
Q

What happens to the Cloud in the Warm Sector?

A

6/8 to 8/8, some large breaks with St and Sc.

41
Q

What happens to the Precipitation in the Warm Sector?

A

Dry or Light Drizzle.

42
Q

What happens to the Visibility in the Warm Sector?

A

Poor.

43
Q

What is the Frontal Slope of a Cold Front?

A

1:50/75.

44
Q

What Cloud exists in a Cold Front?

A

Embedded Cumulonimbus and Cumulus.

45
Q

How long is a Cold Front?

A

200-300 km.

46
Q

How far does the general Weather in a Cold Front extend from the Frontal Surface Point?

A

30-50 nm.

47
Q

What happens to the Wind at the Cold Front?

A

Sharply Veers, gusts and squalls.

48
Q

What happens to the Temperature at the Cold Front?

A

Falls.

49
Q

What happens to the Dew Point at the Cold Front?

A

Falls.

50
Q

What happens to the Pressure at the Cold Front?

A

Starts to Rise.

51
Q

What happens to the Cloud at the Cold Front?

A

All Cloud Types.

52
Q

What happens to the Precipitation at the Cold Front?

A

Heavy Rain, Snow, Hail and Thunderstorms.

53
Q

What happens to the Visibility at the Cold Front?

A

Poor in Precipitation but good elsewhere.

54
Q

What happens to the Wind behind the Cold Front?

A

Slight Veer to NW.

55
Q

What happens to the Temperature behind the Cold Front?

A

Steady Low.

56
Q

What happens to the Dew Point behind the Cold Front?

A

Steady Low.

57
Q

What happens to the Pressure behind the Cold Front?

A

Rises Slowly.

58
Q

What happens to the Cloud behind the Cold Front?

A

4/8 to 6/8, Cu and CB developing.

59
Q

What happens to the Precipitation behind the Cold Front?

A

Showers developing with Hail and Thunderstorms a possibility.

60
Q

What happens to the Visibility behind the Cold Front?

A

Good except in Precipitation.

61
Q

What is the Speed of a Quasi-Stationary Front?

A

5 kts.

62
Q

What conditions will form in a Stable Stationary Front during Summer (2)?

A
  • Stratiform Clouds.

- Drizzle/Light Rain.

63
Q

What conditions will form in a Stable Stationary Front during Winter?

A

Sleet/Snow.

64
Q

What conditions will form in an Unstable Stationary Front during Summer (2)?

A
  • Cumulus Clouds.

- Showers and Frontal Fog.

65
Q

What conditions will form in an Unstable Stationary Front during Winter?

A

Snow Showers.

66
Q

What is an Ana Front?

A

Air in the Warm Sector is rising more.

67
Q

What is a Kata Front?

A

Warm Sector Air descends.

68
Q

What is the term given when a Cold Front catches up with a Warm Front?

A

Occluded Front.

69
Q

What is a Warm Occlusion?

A

Cold Front rides up and over a Warm Front.

70
Q

When does a Warm Occlusion occur?

A

Usually found in Winter but can occur anytime.

71
Q

Describe the Air in a Warm Occlusion?

A

The Cold Air ahead of the Warm Front is colder than the Air behind the Warm Front.

72
Q

What is a Cold Occlusion?

A

Cold Front slips underneath the Warm Front.

73
Q

When does a Cold Occlusion occur?

A

Usually found in Summer but can occur anytime.

74
Q

Describe the Air in a Cold Occlusion?

A

The Cold Air ahead of the Warm Front is warmer than the Air behind the Warm Front.

BFS - Meteorology (22 decks)

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