Meteorology

Question 1

Dry adiabatic lapse rate

Answer 1

3 degrees per 1000 ft

Question 2

Saturated adiabatic lapse rate

Answer 2

1.5 degrees per 1000 ft

Question 3

Dew point drop per 1000 ft

Answer 3

0.5 degrees

Question 4

Unsaturated air temp. dew point closure rate

Answer 4

2.5 degrees per 1000 feet

Question 5

How to calculate convective cloud base

Answer 5

Use temp/DP closure rate of 2.5 per 1000

Question 6

How to calculate non-convective cloud base

Answer 6

use DALR of 3 per 1000

Question 7

signs of warm front passage

Answer 7

Temp: increases
Pressure: decreases before and decreases slowly after passage
Wind: veers and increases

Question 8

Type 1 and 4 deicing fluids

Answer 8

1: goes on hot with limited holdover
2; Goes on cold after type 1 meant to stop refreezing

Question 9

DME frequency range

Answer 9

UHF

Question 10

Order of precipitation when flying through a warm front

Answer 10

Warm to cold: Rain, freezing rain, ice pellets, snow

Question 11

Alto/Cirro cloud heights

Answer 11

Alto- starts at 6500
Cirro- Starts at 20000

Question 12

Wind speed required for mountain waves to occur

Answer 12

25kts

Question 13

SCT is reported when there is ____ cloud coverage

Answer 13

3/8 to 4/8

Question 14

Convective cloud spatial coverage codes and % covered

Answer 14

ISOLD = 25% or less
OCNL = 26% to 50%
FRQ = 50% or more

Question 15

Signs of cold front passage

Answer 15

Temp - decreases
Pressure - Sharp decrease slightly before passage then increases as front passes
Wind: Veers and increases

Question 16

GFA minimum winds published

Answer 16

Sustained speed of 20 kts
Gusts of 30 kts

Question 17

FEW is reported when there is _____ cloud coverage

Answer 17

1/8 to 2/8

Question 18

Mist is reported when vis. is _____

Answer 18

Equal to or greater than 5/8 SM

Question 19

How to decode high level FD

Answer 19

Subtract 50 from direction, add 100 to speed

Question 20

Conditions conducive to thunderstorms

Answer 20

-Steep lapse rate
-High moisture content
-lifting agent

Question 21

TAF change group TEMPO

Answer 21

Temporary change in conditions lasting less than 1 hour

Question 22

GFA forecast alt.

Answer 22

Below 24000 (400 mb)

Question 23

BKN is reported when there is ____ cloud coverage

Answer 23

5/8 to less than 8/8

Question 24

TAF change group PROB

Answer 24

There is a 30 or 40 percent chance that the condition will exist

Question 25

Fog is reported when vis is _____

Answer 25

less than 5/8 SM

Question 26

From how far away can you experience mountain waves?

Answer 26

150 NM from mountain peak

Question 27

Air mass nomenclature

Answer 27

Moisture content: -Continental = dry -Maritime = moist Temperature: -Arctic = cold -Polar = cool -Tropical = warm

Question 28

Upper front passage

Answer 28

No change in wind or temp. precipitation will still fall

Question 29

CLR in AWOS report ? What does AWOS mean?

Answer 29

CLR = no cloud below 10000 AWOS = automated weather observation system

Question 30

AWOS vs human reporting

Answer 30

AWOS is more accurate except heavy rain or blowing snow cause erroneous readings

Question 31

Standard meridians in Canada

Answer 31

AST-60W; EST-75W; CST- 90W; MST-105W; PST-120W

Question 32

What happens to true altitude when temperature decreases

Answer 32

True altitude is lower in low temperature (altimeter reads higher)

Question 33

Mountain waves effect on altimeter

Answer 33

Increased wind speed in waves cause decrease in pressure. altimeter reads higher (true altitude is lower)

Question 34

Where do rotor clouds form?

Answer 34

Near the ridge of mountains

Question 35

What is virga?

Answer 35

Falling rain that evaporates before it hits the ground. virga is the strong downdraft that remains

Question 36

Distance to stay away from thunderstorm

Answer 36

20 NM

Question 37

Thunderstorm stages

Answer 37

Developing - updrafts only Mature - Updrafts and downdrafts/heavy rain/ Dissipating - Downdrafts only/rain

Question 38

Carburetor icing highest risk temperature

Answer 38

-5 to +15

Question 39

range control on airborne weather radar

Answer 39

Adjusts how far forward the pilot can see ahead of the aircraft but it does not change the amount of radar energy being transmitted.

Question 40

Where does convergence happen

Answer 40

Center of a low

Question 41

Freezing level line spacing on GFA

Answer 41

2500' Intervals

Question 42

How does frontal fog form `

Answer 42

Precipitation falls from warm air mass into cold ai mass

Question 43

Upper level chart heights and hPa

Answer 43

850 hPa - 5000' 700 hPa - 10000' 500 hPa - 18000' 250 hPa - 34000'

Question 44

Upper level chart contour spacing

Answer 44

60 meters (120 on 250 hPa chart)

Question 45

When are winds reported as VRB

Answer 45

Less than 3 knots and variable direction or stronger winds which direction is impossible to determine

Question 46

Issue frequency of upper level and surface charts

Answer 46

0000Z and 1200Z (twice/day)

Question 47

What does XX mean on upper level chart?

Answer 47

Cloud base is below forecast altitude

Question 48

What is steam fog

Answer 48

Water vapor being introduced into cold air

Question 49

Upper front on GFA symbol

Answer 49

normal front but unshaded