Weather

Question 1

Why does the wind have a tendency to flow parallel to the isobars above the friction level?

Answer 1

Coriolis force tends to counterbalance the horizontal pressure gradient

Question 2

What prevents air from flowing directly from high-pressure areas to low-pressure areas?

Answer 2

Coriolis force

Question 3

Moisture is added to air by

Answer 3

Evaporation and sublimation

Question 4

Ice pellets encountered during flight normally are evidence that

Answer 4

A warm front is about to pass

Question 5

What is the convergence of temperature and dewpoint rate?

Answer 5

2.45°C or 4.4°F

Question 6

Fog produced by frontal activity is a result of saturation due to

Answer 6

evaporation of precipitation

Question 7

Which in-flight hazard is most commonly associated with warm fronts?

Answer 7

Precipitation-induced fog

Question 8

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

Answer 8

weather forecast office (WFO)

Question 9

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

Answer 9

continuous recording of meteorological and/or aeronautical information available by telephone.

Question 10

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

Answer 10

Sudden increases in windspeed of at least 16 knots to a sustained speed of 22 knots or more for at least 1 minute.

Question 11

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

Answer 11

Four times daily and are usually valid for a 24 hour period.

Question 12

Which information section is contained in the Aviation Area Forecast (FA)?

Answer 12

VFR Clouds and Weather (VFR CLDS/WX)

Question 13

The section of the Aviation Area Forecast (FA) entitled VFR Clouds and Weather contains a summary of

Answer 13

sky condition, cloud heights, visibility, obstructions to vision, precipitation, and sustained surface winds of 20 knots or greater

Question 14

What values are used for Winds Aloft Forecasts?

Answer 14

True direction and knots

Question 15

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

Answer 15

Surface Analysis Chart

Question 16

The Surface Analysis Chart depicts

Answer 16

actual frontal positions
pressure patterns
temperature
dewpoint
wind
weather
obstructions to vision

…at the valid time of the chart

Question 17

The difference found by subtracting the temperature of a parcel of air theoretically lifted from the surface to 500-millibars and the existing temperature at 500 millibars is called the

Answer 17

lifted index

Question 18

Hatching on a Constant Pressure Analysis Chart indicates

Answer 18

windspeeds 70 knots to 110 knots

Question 19

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

Answer 19

Winds and temperatures aloft

Question 20

The minimum vertical wind shear value critical for probable moderate or greater turbulence is

Answer 20

6 knots per 1,000 feet

Question 21

A strong wind shear can be expected on what side of a jet stream core and at what speed?

Answer 21

on the low-pressure side of a jetstream core where the speed at the core is stronger than 110 knots

Question 22

One of the most dangerous features of mountain waves is the turbulent areas in and

Answer 22

below rotor clouds

Question 23

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

Answer 23

Air Route Traffic Control Centers (ARTCC)

Question 24

The National Convective Weather Forecast is a supplement to, but does not substitute for, the report and forecast contained in

Answer 24

Convective SIGMETs

Question 25

You are obtaining a weather briefing for a xc flight. The briefer has given you a convective outlook for your route of flight. What are the three levels of convective activity (not turbulence) in the convective outlook?

Answer 25

Slight, Moderate, High

Question 26

Decode the radar weather report:

KOKC 1934 LN8TRW++/+ 86/40 164/60 199/115 15W C2425 MT 570 AT159/65 2 INCH HAIL RPRTD THIS CELL

Answer 26

KOKC 1934 LN8TRW++/+ 86/40 164/60 199/115 15W C2425 MT 570 AT159/65 2 INCH HAIL RPRTD THIS CELL

for KOKC at 1934Z, area of echos 8/10 coverage, very heavy rain showers, area defined by 86 degrees at 40NM, 164 degrees at 60NM, and 199 degrees at 115NM, area 15NM wide, movement from 240 degrees at 25 knots, maximum tops 57,000 feet located at 159 degrees at 65NM, and 2 inch hail.

Question 27

How long is the forecast of a Convective SIGMET valid for?

Answer 27

2 hours

Question 28

What weather phenomenon is implied within an area enclosed by bold yellow dashed lines on a US High-Level Significant Weather Prognostic Chart?

Answer 28

Moderate or severe turbulence

Question 29

What are some weather indications of the imminent passage of a cold front?

Answer 29

High dew point, falling barometric pressure

Question 30

What weather phenomena can be expected before the passage of an occluded front?

Answer 30

Precipitation and poor visibility

Question 31

If the temperature lapse rate decreases, what happens to the stability of the air?

Answer 31

Stability increases

Question 32

What significant cloud coverage is reported by this pilot report?
KMOB UA/OV 15NW 1340Z/SK 025 OVC 045/075 OVC 080/090 OVC

A) Three (3) separate overcast layers exist with bases at 2,500, 7,500, and 9,000 feet.

B) The top of the lower overcast is 2,500 feet; base and top of second overcast layer is 4,500 and 7,500 feet, respectively.

C) The base of the second overcast layer is 2,500 feet; top of the second overcast layer is 7,500 feet; base of third layer is 9,000 feet.

Answer 32

A) Three (3) separate overcast layers exist with bases at 2,500, 7,500, and 9,000 feet.

Question 33

What is the approximate base of the cumulus clouds if the temperature at 2,000 feet MSL is 10°C and the dewpoint is 1°C?

A) 3,000 feet MSL

B) 4,000 feet MSL

C) 6,000 feet MSL

Answer 33

C) 6,000 feet MSL

Temp/Dewpoint spread is 9°C
9°C / 2.45 = 3.67 * 1000 = 3670
3670 + 2000 (surface in MSL) = 5670 ~ 6000 feet MSL

Question 34

The Aviation Weather Center (AWC) prepares FA’s for the contiguous US how often?

Answer 34

three times a day

Question 35

Which forecast provides specific information concerning expected sky cover, cloud tops, visibility, weather, and obstructions to vision in a route format?

Answer 35

Area Forecast

Question 36

What weather phenomenon is implied within an area enclosed by red scalloped lines on a US High-Level Significant Weather Prognostic Chart?

Answer 36

Moderate or severe icing

Question 37

From what weather chart can the observed temperature, wind, and temperature/dewpoint spread be determined at a specified altitude?

Answer 37

Constant Pressure Analysis Chart

Question 38

The National Convective Weather Forecast is a supplement to, but does not substitute for, the report and forecast information contained in

Answer 38

Convective SIGMETs

Question 39

What are some weather indications of the imminent passage of a cold front?

Answer 39

High dewpoint, falling barometric pressure

Question 40

If ice pellets are falling while you are performing your preflight inspection, what does this indicate?

Answer 40

an inversion is taking place

Question 41

When and where is the jet stream the strongest?

Answer 41

Northern and Southern Hemispheres winters