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Private Pilot Practical > Oral Exam - Weather > Flashcards

Oral Exam - Weather Flashcards

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Charter Pilot (Part 135) - Oral flashcards
1
Q

What are the general characteristics in regard to the flow of air around higha nd low pressure systems in the Northern Hemisphere?

A

Low pressure - inward, upward, and counterclockwise

High pressure - outward, downward, and clockwise

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2
Q

What is a trough?

A

An elongated area of relatively low atmospheric pressure

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3
Q

What is a ridge?

A

Elongated area of relatively high atmospheric pressure

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4
Q

What are the standard temperature and pressure values for sea level?

A

15 degrees celcius and 29.92”Hg

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5
Q

What are isobars?

A

A line on a weather chart which connects areas of equal or constant barometic pressure

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6
Q

What do the spacing of isobars on pressure charts indicate?

A

How steep or shallow a pressure gradient is

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7
Q

What causes winds aloft to flow parallel to the isobars?

A

Coriolois Force

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8
Q

Why do surface winds generally flow across the isobars at an angle?

A

Surface friction

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9
Q

At what rate does atmospheric pressure decrease with an increase in altitude?

A

1” Hg per 1,000 feet

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10
Q

What does dew point mean?

A

Dew point is the temperature to which a sample of air must be cooled to attain the state of saturation

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11
Q

When temp and dew point are close together, what weather is likely?

A

Visible moisutre in the form of clouds, dew, or fog.

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12
Q

What factor primarily determines the type and vertical extent of clouds?

A

Stability of the atmosphere

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13
Q

HOw do you determine the stability of the atmosphere?

A

By observing the actual lapse rate

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14
Q

List the effects of stable and unstalbe air on clouds, turbulence, precipitation, and visibility

A

Stable - Stratiform, smooth, steady, and fair to poor vis

Unstable - cumuliform, rough, showery, and good visibility

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15
Q

How to figure out where to expect bases of clouds?

A

Temp - dewpoint/4 X 1000 = base of clouds

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16
Q

What conditions are necessary for structural icing to occur?

A

Visibile moisture and below freezing temperatures at the point moisture strikes the aircraft?

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17
Q

What are two types of icing?

A

Structural and induction

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18
Q

Four types of structural ice?

A

Clear -
Rime -
Mixed -
Frost -

19
Q

What to do if inadvertently encounter icing?

A

Change course and or altitude, climb to a higher altitude, if possible

20
Q

What factors must be present for a thunderstorm to form?

A

Source of lift, unstable air, and high moisture content

21
Q

Three stages of thunderstorm?

A

Cumulus, mature, dissipating

22
Q

Temp inversion?

A

An inversion is an increase in temperature with height, a reversal of the normal decrease with height

23
Q

Two basic way that fog may form

A

(1) Cool air to the dew point

(2) add moisture to the air

24
Q

Name Several types of fog

A

Radiation, advection fog, upslope fog, precipitation indcued fog, ice fog

25
Q

What causes radiation fog to form?

A

The ground cools the adjacent air to the dew point on calm, clear nights

26
Q

What is advection fog and where is it most likely to form?

A

Advection fog results from the transport of warm humid air over a cold sufrace.

coastal areas during winter

27
Q

What is upslope fog?

A

Result of moist, stable air being cooled adiabatically as it moves upsloping terrain.

28
Q

Where is wind shear likely?

A

Low level temperature inversion

Wind shear in a frontal zone or thunderstorm

Clear air turbulence

29
Q

Primary means by which to obtain a weather briefing?

A

Obtained from a breifer at the AFSS/FSS via 1800WXBRIEF

30
Q

What are some examples of other sources of weather information? (5)

A

(1) Telephone information briefing services
(2) transcribed weather broadcasts (TWEB)
(3) Telephone Access to TWEB (TEL-TWB)
(4) Weather and aeronautical information from numerous private industry sources
(5) DUATS

31
Q

Where can you find a listing of FSS and weather information numbers?

A

in the AFD or phonebook

32
Q

What is EFAS?

A

En Route Flight Advisory Service is a service specifically designed to provide enroute aircraft with timely and meaning weather advisories pertinent to the type of flight intended, route, and altitude. Includes PIREPS

33
Q

What is HIWAS?

A

continuous broadcast of inflight weather advisories including aviation weather warnings, SIGMETS, Convective SIGMETs, AIRMETS, PIREPS

34
Q

What is a METAR?

A

an Aviation Routine Weather Report - hourly surface observations of conditions observed at an airport

35
Q

What is a TAF

A

A Terminal Aerodrome Forecast is a consicise statement of the expected meteorological conditions within a 5 statue mile radius from the cetner of an airport’s runway complex during a 24 hours period

36
Q

What is a convective SIGMET?

A

implies severe or greater turbulence sever icing and low level wind shear

37
Q

SIGMET?

A

Advises of non-convective weather that is potentially hazardous to all aircraft

38
Q

AIRMET?

A

Advisories of significant weather phenomena that describe conditions at intensities lower than those which require the issuance of SIGMETs intended for use by all pilot int he preflight and enroute phases of flight

39
Q

What is a TWEB?

A

A transcribed weather broadcast - surface winds, visibility, weather, sky conditions, mountain obscurant, low level wind shear

40
Q

What are Center Weather Advisories (CWA)

A

an aviation warning for use by aircrafts to anticpate and avoid adverse weather conditions in the en route and terminal environments

41
Q

Convective Outlook?

A

A national forecast of thunderstorms, in 2 parts, Day 1 Convective outlook, and Day 2 Convective Outlook

42
Q

What is IFR?

A

Ceilings less than 1,000 and or visibility less than 3 miles

43
Q

what is MVFR?

A

Marginal VFR ceiling 1000 to 3000, and/or visibility 3-5 miles

44
Q

VFR?

A

No ceiling, or ceiling greater than 3,000 and visibility greater than 5 miels

Private Pilot Practical (7 decks)

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