Weather

Question 1

In general, what weather can you expect in a high pressure system?

Answer 1

A high pressure system is an area of descending air, which tends to favor dissipation of cloudiness and good weather.

Question 2

What is the flow of air around high pressure systems in the northern hemisphere?

Answer 2

Outward, downward, clockwise.

Question 3

What are the general characteristics of the weather near a cold front?

Answer 3

As the front passes expect towering cumulus or cumulonimbus clouds, heavy rain, lightning, thunder and hail, poor visibility. Winds could be variable and gusting. Temp/dew point/pressure drop rapidly.

Question 4

What are the different precipitation types?

Answer 4

Drizzle, rain, freezing rain, freezing drizzle, snow, snow grains, ice crystals, ice pellets, hail, small hail, snow pellets

Question 5

What are the 3 primary causes of turbulence?

Answer 5

Convective currents
Obstructions in the wind
Wind sheer

Question 6

What is the flow of air around a low pressure system in the northern hemisphere?

Answer 6

Inward, upward, counterclockwise

Question 7

What are the general characteristics of the weather near a warm front?

Answer 7

As the front passes, expect weather, stratiform clouds, drizzle, low ceilings poor visibility, variable winds and a rise in temp.

Question 8

4 levels of turbulence

Answer 8

Light
Moderate
Severe
Extreme

Question 9

What is a Convective SIGMET?

Answer 9

Thunderstorms
Squall Lines
Hail

Question 10

What are the three types of AIRMETs?

Answer 10

Sierra- visibility
Tango- turbulence
Zulu- icing

Question 11

High level clouds above 20,000 ft, fibrous, wispy.

Answer 11

Cirrus

Question 12

Rime Ice

Answer 12

Opaque appearance
formed in stratus clouds
results from instantaneous freezing of tiny super cooled water striking an aircraft surface
-15 C to -20 C

Question 13

Which thunderstorms produce the most intense hazards to aircraft?

Answer 13

Squall line thunderstorms

Question 14

Lower Clouds 6,500 ft and below

Answer 14

Stratus

Question 14

Ice Fog

Answer 14

In cold weather when the temp is much below freezing and water forms directly into ice crystals.

Question 14

What would decrease the stability of an air mass?

Answer 14

Warming from below

Question 14

When the term light and variable is used in reference to winds aloft the coded group and wind speed is…

Answer 14

9900 and less than 5 knots

Question 15

A pilot can expect a wind-sheer zone in a temperature inversion whenever the wind speed at 2,000 - 4,000 AGL is at least…

Answer 15

25 knots

Question 16

What is standard pressure

Answer 16

29.92 in

Question 17

What is standard temperature in Celsius?

Answer 17

15 C

Question 18

The wind condition that requires maximum caution when avoiding wake turbulence on landing is

Answer 18

light quartly tailwind.

Question 19

What is Inversion

Answer 19

Shallow layers of smooth stable air close to the ground . Warm area above keeping air trapped.

Question 20

What is atmospheric stability

Answer 20

The stability of atmosphere is the ability to resist vertical motion

Question 21

Cold Front

Answer 21

Dense mass of air, stays close to the surface. Advances quickly.

Question 22

Air cools _____ Celsius per 1000 ft of Alt. gained

Answer 22

2 degrees Celsius

Question 23

Moist Stable air flowing upslope can be expected to form...

Answer 23

stratus type clouds.

Question 24

Radiation Fog

Answer 24

Forms when the ground cools rapidly due to terrestrial radiation, and surrounding air reaches dew point.

Question 25

Steam Fog

Answer 25

When cold dry air moves over warm water.

Question 26

What is a METAR.

Answer 26

An hourly surface observations of conditions observed at an airport.

Question 27

In general what weather can you expect in a low pressure system.

Answer 27

A low-pressure system is a system characterized by rising air which is conducive to cloudiness, precipitation, and bad weather.

Question 28

What are convective currents?

Answer 28

Uneven heating of air creates areas of local circulation.

Question 29

Coriolis Force

Answer 29

The force created by the rotation of the Earth.

Question 30

Warm Front

Answer 30

warm mass of air advancing high humidity shown by red lines

Question 31

Deviation

Answer 31

Obtained from deviation card in the aircraft. Created form magnetic fields in the aircraft.

Question 32

CAT

Answer 32

Clear Air Turbulence sudden, severe, in cloudless regions High Alt, above 15,000 MSL

Question 33

Class Charlie Alt/Size

Answer 33

4000 AGL Bottom ring extends 5nm from airport. Upper ring from 1200 AGL to 4000, 10nm from airport.

Question 34

Mixed Ice

Answer 34

Mix of Clear and Rime Ice -10 C and -15 C

Question 35

Which way does air deflect in Northern Hemisphere?

Answer 35

Deflects to the right.

Question 36

SIGMET

Answer 36

Advises of weather that is potentially hazardous to all aircraft. They are unscheduled and are valid for 4 hrs.

Question 37

What are TAFs

Answer 37

Terminal aerodrome forecast is a concise statement of the expected meteorological conditions for a specified time period within 5 statute miles of airport center.

Question 38

3 types of Icing

Answer 38

Structural, Induction, instrumental icing

Question 39

3 stages of a Thunderstorm

Answer 39

1) Cumulus stage 2) Mature stage (moisture begins falling most dangerous stage) 3) Dissipating stage (downdrafts spread out)

Question 40

Upslope Fog

Answer 40

Moist stable air is forced up sloping land like mountains

Question 41

What is a PIREP

Answer 41

A PIREP is a pilot report regarding conditions as they exist in the air.

Question 42

METAR Decode

Answer 42

1) Type of report 2) ICAO station identifier 3) Date and time of report 4) Modifier (auto if auto generated) 5) Wind 6) Visibility 7) Runway visual range 8) Weather phenomena 9) Sky condition 10) Temperature 11) Altimeter 12) Remarks

Question 43

Describe several types of weather observing programs

Answer 43

Manual observations AWOS- automated weather observing system ASOS- Automated surface observing system

Question 44

What service does the FAA provide for pilots to obtain a weather briefing

Answer 44

FAA provides the Flight Service program which provides weather briefings to pilots through it's Flight Service Stations by phone 1-800-WX-BRIEF and online at 1800wxbrief.com

Question 45

Cumulus Clouds

Answer 45

heaped or piled clouds

Question 46

Cirrus Clouds

Answer 46

ringlets, fibrous, high level 20,000 AGL +

Question 47

Cumulonimbus Clouds

Answer 47

Signs of thunderstorms, squall lines, unstable air

Question 48

Nimbus Clouds

Answer 48

Rain bearing clouds

Question 49

Stratus

Answer 49

Formed in layers 6500 AGL and below.

Question 50

How heavy is the Atmosphere at sea level

Answer 50

14.7 lbs/ in2 supports 29.92 inches of mercury

Question 51

On average, with every 1000 ft of increase of Alt. the atmosphere pressure decrease of...

Answer 51

decrease 1" of Mercury.

Question 52

Squall Line

Answer 52

A narrow band of active T-storms.

Question 53

The amount of moisture in the air depends on what factor

Answer 53

Every 20 degrees increase in temp. doubles amount of moisture the air can hold.

Question 54

Advection Fog

Answer 54

Common in coastal areas. When a layer of warm moist air moves over a cold surface.

Question 55

Wind Shear

Answer 55

A sudden drastic change in wind speed or direction over a very small area.

Question 56

Clear Ice

Answer 56

Develope in cumulus clouds or freezing rain. Flows over surface and slowly freezes creating a glaze.

Question 57

What type of briefings are available from a FSS briefer

Answer 57

Standard brief Abbreviated brief Outlook brief Inflight brief

Question 58

What is an AIRMET?

Answer 58

A textual advisory of significant weather that is less severe than SIGMETs.

Question 59

What is a G-AIRMET

Answer 59

A graphical advisory that may be hazardous but is less severe than a SIGMET. Issued 3 hrs apart for 12 hours into the future.