Commercial – Chapter 8 – Aviation Weather Services

Question 1 of 38

1. Question

The Telephone Information Briefing Service (TIBS) provided by FSSs includes

weather information service on a common frequency (122.2 MHz).
recorded weather briefing service for the local area, usually within 50 miles and route forecasts.
continuous recording of meteorological and/or aeronautical information available by telephone.

Question 2 of 38

2. Question

Weather Advisory Broadcasts, including Severe Weather Forecast Alerts (AWWs), Convective SIGMETs, and SIGMETs, are provided by

ARTCCs on all frequencies, except emergency, when any part of the area described is within 150 miles of the airspace under their jurisdiction.
FSSs on 122.2 MHz and adjacent VORs, when any part of the area described is within 200 miles of the airspace under their jurisdiction.
selected VOR navigational aids.

Question 3 of 38

3. Question

During preflight preparation, weather report forecasts which are not routinely available at the local service outlet (FSS) can best be obtained by means of contacting

weather forecast office (WFO).
air route traffic control center.
pilot's automatic telephone answering service.

Question 4 of 38

4. Question

The Hazardous lnflight Weather Advisory Service (HIWAS) is a broadcast service over selected VORs that provides

SIGMETs and AIRMETs at 15 minutes and 45 minutes past the hour for the first hour after issuance.
continuous broadcast of inflight weather advisories.
SIGMETs, CONVECTIVE SIGMETs and AIRMETs at 15 minutes and 45 minutes past the hour.

Question 5 of 38

5. Question

The most current en route and destination weather information for an instrument flight should be obtained from the

FSS.
ATIS broadcast.
Notices to Airmen (class II).

Question 6 of 38

6. Question

Refer to the excerpt from the following METAR report:

KTUS…..08004KT 4SM HZ …..26/04 A2995 RMK RAE36

At approximately what altitude AGL should bases of convective-type cumuliform clouds be expected?

4,400 feet.
8,800 feet.
17,600 feet.

Question 7 of 38

7. Question

What significant cloud coverage is reported by this pilot report?

KMOB

UA/OV 15NW MOB 1340Z/SK OVC 025/045 OVC

090

Three (3) separate overcast layers exist with bases at 250, 7,500, and 9,000 feet.
The top of the lower overcast is 2,500 feet; base and top of second overcast layer are 4,500 and 9,000 feet, respectively.
The base of the second overcast layer is 2,500 feet; top of second overcast layer is 7,500 feet; base of third layer is 9,000 feet.

Question 8 of 38

8. Question

The remarks section of the Aviation Routine Weather Report (METAR) contains the following coded information. What does it mean?

RMK FZDZB42 WSHFT 30 FROPA

Freezing drizzle with cloud bases below 4,200 feet.
Freezing drizzle below 4,200 feet and wind shear.
Wind shift at three zero due to frontal passage.

Question 9 of 38

9. Question

The station originating the following METAR observation has a field elevation of 3,500 feet MSL. If the sky cover is one continuous layer what is the thickness of the cloud layer? (Top of overcast reported at 7,500 feet MSL.)

METAR KHOB 1512502 17006KT 4SM OVC005 13/11 A2998

2,500 feet.
3,500 feet.
4,000 feet.

Question 10 of 38

10. Question

The station originating the following METAR observation has a field elevation of 5,000 feet MSL. If the sky cover is one continuous layer what is the thickness of the cloud layer? (Top of overcast reported at 8,000 feet MSL.)

METAR KHOB 1512502 17006KT 4SM OVC005 13/11 A2998

2,500 feet.
3,500 feet.
4,000 feet.

Question 11 of 38

11. Question

What is meant by the Special METAR weather observation for KBOI?

SPECI KBOI 0918542 32005KT 1 1/2SM RA BR OVC007 17/16 A2990 RMK RAB12

Rain and fog obscuring two-tenths of the sky; rain began at 1912Z.
Rain and mist obstructing visibility; rain began at 1812Z.
Rain and overcast at 1,200 feet AGL.

Question 12 of 38

12. Question

What is meant by the Special METAR weather observation for KBOI?

SPECI KBOI 0918542 32005KT 1 1/2SM RA BR OVC007 17/16 A2990 RMK RAB12

Rain and fog are creating an overcast at 700 feet AGL; rain began at 1912Z.
The temperature-dew point spread is 1°C; rain began at 1812Z.
Rain and overcast at 1,200 feet AGL.

Question 13 of 38

13. Question

The Surface Analysis Chart depicts

frontal locations and expected movement, pressure centers, cloud coverage, and obstructions to vision at the time of chart transmission.
actual frontal positions, pressure patterns, temperature, dewpoint, wind, weather, and obstructions to vision at the valid time of the chart.
actual pressure distribution, frontal systems, cloud heights and coverage, temperature, dewpoint, and wind at the time shown on the chart.

Question 14 of 38

14. Question

On a Surface Analysis Chart, the solid lines that depict sea level pressure patterns are called

isobars.
isogons.
millibars.

Question 15 of 38

15. Question

Dashed lines on a Surface Analysis Chart, if depicted, indicate that the pressure gradient is

weak.
strong.
unstable.

Question 16 of 38

16. Question

On a Surface Analysis Chart, close spacing of the isobars indicates

weak pressure gradient.
strong pressure gradient.
strong temperature gradient.

Question 17 of 38

17. Question

Which chart provides a ready means of locating observed frontal positions and pressure centers?

Surface Analysis Chart.
Constant Pressure Analysis Chart.
Weather Depiction Chart.

Question 18 of 38

18. Question

Hatching on a Constant Pressure Analysis Chart indicates

hurricane eye.
wind speed 70 knots to 110 knots.
wind speed 110 knots to 150 knots.

Question 19 of 38

19. Question

What flight planning information can a pilot derive from Constant Pressure Analysis Charts?

Winds and temperatures aloft.
Clear air turbulence and icing conditions.
Frontal systems and obstructions to vision aloft.

Question 20 of 38

20. Question

From which of the following can the observed temperature, wind, and temperature/dewpoint spread be determined at a specified altitude?

Stability Charts.
Winds Aloft Forecasts.
Constant Pressure Analysis Charts.

Question 21 of 38

21. Question

What is the meaning of the terms PROB40 2102 +TSRA as used in a Terminal Aerodrome Forecast (TAF)?

Probability of heavy thunderstorms with rain showers below 4,000 feet at time 2102.
Between 210oz and 020oz there is a forty percent (40%) probability of thunderstorms with heavy rain.
Beginning at 2102Z forty percent (40%) probability of heavy thunderstorms and rain showers.

Question 22 of 38

22. Question

What does the contraction VRB in the Terminal Aerodrome Forecast (TAF) mean?

Wind speed is variable throughout the period.
Cloud base is variable.
Wind direction is variable.

Question 23 of 38

23. Question

Which statement pertaining to the following Terminal Aerodrome Forecast (TAF) is true?

TAF

KMEM 091135Z 0915 15005KT 5SM HZ BKN060 FM1600 VRB04KT P6SM SKC

Wind in the valid period implies surface winds are forecast to be greater than 5 KTS.
Wind direction is from 160° at 4 KTS and reported visibility is 6 statute miles.
SKC in the valid period indicates no significant weather and sky clear.

Question 24 of 38

24. Question

The visibility entry in a Terminal Aerodrome Forecast (TAF) of P6SM implies that the prevailing visibility is expected to be greater than

6 nautical miles.
6 statute miles.
6 kilometers.

Question 25 of 38

25. Question

Terminal Aerodrome Forecasts (TAF) are issued how many times a day and cover what period of time?

Four times daily and are usually valid for a 24 hour period.
Six times daily and are usually valid for a 24 hour period including a 4-hour categorical outlook.
Six times daily and are valid for 12 hours including a 6-hour categorical outlook.

Question 26 of 38

26. Question

What single reference contains information regarding a volcanic eruption, that is occurring or expected to occur?

In-Flight Weather Advisories.
Terminal Area Forecasts (TAF).
Weather Depiction Chart.

Question 27 of 38

27. Question

In-Flight Aviation Weather Advisories include what type of information?

Forecasts for potentially hazardous flying conditions for en route aircraft.
State and geographic areas with reported ceilings and visibilities below VFR minimums.
IFR conditions, turbulence, and icing within a valid period for the listed states.

Question 28 of 38

28. Question

What type of In-Flight Weather Advisories provides an en route pilot with information regarding the possibility of moderate icing, moderate turbulence, winds of 30 knots or more at the surface and extensive mountain obscurement?

Convective SIGMETs and SIGMETs.
Severe Weather Forecast Alerts (AWWs) and SIGMETs.
AIRMETs and Center Weather Advisories (CWAs).

Question 29 of 38

29. Question

SIGMETs are issued as a warning of weather conditions which are hazardous

to all aircraft.
particularly to heavy aircraft.
particularly to light airplanes.

Question 30 of 38

30. Question

Which correctly describes the purpose of convective SIGMETs (WST)?

They consist of an hourly observation of tornadoes, significant thunderstorm activity, and large hailstone activity.
They contain both an observation and a forecast of all thunderstorm and hailstone activity. The forecast is valid for 1 hour only.
They consist of either an observation and a forecast or just a forecast for tornadoes, significant thunderstorm activity, or hail greater than or equal to 3/4 inch in diameter.

Question 31 of 38

31. Question

What wind conditions would you anticipate when squalls are reported at your destination?

Rapid variations in windspeed of 15 knots or more between peaks and lulls.
Peak gusts of at least 35 knots combined with a change in wind direction of 30° or more.
Sudden increases in wind speed of at least 16 knots to a sustained speed of 22 knots or more for at least 1 minute.

Question 32 of 38

32. Question

What weather phenomenon is implied within an area enclosed by small scalloped lines on a U.S. High-Level Significant Weather Prognostic Chart?

Cirriform clouds, light to moderate turbulence, and icing.
Cumulonimbus clouds, icing, and moderate or greater turbulence.
Cumuliform or standing lenticular clouds, moderate to severe turbulence, and icing

Question 33 of 38

33. Question

Which weather chart depicts conditions forecast to exist at a specific time in the future?

Freezing Level Chart.
Weather Depiction Chart.
12-hour Significant Weather Prognostic Chart.

Question 34 of 38

34. Question

What is the upper limit of the Low Level Significant Weather Prognostic Chart?

30,000 feet.
24,000 feet.
18,000 feet.

Question 35 of 38

35. Question

The U.S. High-Level Significant Weather Prognostic Chart forecasts significant weather for what airspace?

18,000 feet to 45,000 feet.
25,000 feet to 45,000 feet.
25,000 feet to 63,000 feet.

Question 36 of 38

36. Question

What significant cloud coverage is reported by this pilot report?

KMOB

UA/OV 15NW MOB 1340Z/SK 025 OVC 045/075

OVC 080/090 OVC

Three (3) separate overcast layers exist with bases at 2,500, 7,500 and 9,000 feet.
The top of the lower overcast is 2,500 feet; base and top of second overcast layer are 4,500 and 9,000 feet, respectively.
The base of the second overcast layer is 2,500 feet; top of second overcast layer is 7,500 feet; base of third layer is 9,000 feet.

Question 37 of 38

37. Question

To best determine observed weather conditions between weather reporting stations, the pilot should refer to

pilot reports.
area forecasts.
prognostic charts.

Question 38 of 38

38. Question

What values are used for Winds Aloft Forecasts?

True direction and MPH.
True direction and knots.
Magnetic direction and knots.