MET 1

Question 1

What is Relative Humidity measured with?

Answer 1

Hygrometer

Question 2

What is Cloud base/amount measured in?

Answer 2

Ceilometer

Question 3

What is Precipitation measured with?

Answer 3

Rain Gauge

Question 4

What is Dew Point measured with?

Answer 4

Calculated

Question 5

What is Air Density measured with?

Answer 5

Calculated

Question 6

What is Ground Vis measured with?

Answer 6

Observer/Visiometer

Question 7

What is IRVR measured by?

Answer 7

Transmissometer

Question 8

What is Wind speed measured by?

Answer 8

Anemometer

Question 9

What is the WMO?

Answer 9

World Met Organisation

-Set met standards across the world

Question 10

What is Annex 3?

Answer 10

Met service for international Air Nav

Question 11

What does Annex 11 say?

Answer 11

ATSU’s shall be provided with up to date info on existing/forecast weather

Question 12

What does EU 2017/373 say?

Answer 12

Met service providers shall provide relevant info to ops/flight crew/ATSU’s/SAR

Question 13

What is a Micro/Macroburst?

Answer 13

Downward and outward burst of air (micro is less than 4km wide)

Question 14

What is squall?

Answer 14

Strong wind that lasts at least 1 min. Causes danger near surface

Question 15

What is windsheer?

Answer 15

Strong change in windspeed/direction over short distance/time

Question 16

What is the WAFC?

Answer 16

World Area Forecast Area

-Global forecasts for aviation/pilot briefings

Question 17

Where is WAFC based?

Answer 17

-UK Met Office in Exeter - Manages Europe, Asia, Middle East, Africa and Indian Ocean

-NOAA (National Oceanic & Atmospheric Administration) in Washington - Manages Americas and Pacific

Question 18

What is an MWO?

Answer 18

Met Watch Office

-Continuous weather watch responsible for appropriate area

-UK Met Office serves UK FIRs

Question 19

What is a VAAC?

Answer 19

Volcanic Ash Advisory Centre

Met Office & Toulouse responsible for Europe, Middle East and Asia

Question 20

Who will support with METARs with periodic observations and also provide info to MWOs?

Answer 20

ATSUs

Question 21

What types of weather observations are there?

Answer 21

-Surface (Boat, Buoy, ATSU)
-Upper air (Radiosonde attached to balloon)
-Aircraft
-Satellite

Question 22

What is Doc 9377?

Answer 22

Format and frequency for how/when met info is provided

Question 23

Describe the Troposphere

Answer 23

-6-20km high
-Most weather occurs
-Contains 75% of airmass
-Thicker at equator

Question 24

Name the levels in the atmosphere

Answer 24

-Troposphere
-Stratosphere
-Mesosphere
-Thermosphere
-Exosphere

Question 25

Describe the Stratosphere

Answer 25

-Temp rises to -15C -(6-20km)-50km -Contains Ozone

Question 26

Describe the Mesosphere

Answer 26

-No weather -Temp decreases -50-80km

Question 27

Describe the Thermosphere

Answer 27

-Temp increase but no particles to feel it -up to 500-690km -Aurora

Question 28

What is the composition of the air?

Answer 28

-78% Nitrogen -21% Oxygen -1-4% Water Vapour -1% Argon -0.3% Carbon Dioxide

Question 29

What are the ISA measurements at MSL?

Answer 29

-15C Temp -1.225Kg/Mcubed Density -1013.25hPa Pressure

Question 30

What is the Temperature and \pressure ISA lapse rate?

Answer 30

-2C / 1000ft up to 36000ft/11km and -0C up to 20km -1hPA / 30ft

Question 31

What 3 types of air are low pressure?

Answer 31

-Warm air -High altitude air -Humid air

Question 32

What 3 types of air are High pressure?

Answer 32

-Cold air -Low alt air -Dry air

Question 33

How is heat transferred in the atmosphere?

Answer 33

-Radiation - Electromagnetic waves -Conduction - Physical contact between two substances -Convection - Rising warm air -Advection - laterally moving air

Question 34

What is DALR?

Answer 34

Dry Adiabatic Lapse Rate -3C/1000ft

Question 35

What is SALR?

Answer 35

Saturated Adiabatic Lapse Rate -1.5C / 1000ft

Question 36

What is ELR?

Answer 36

Environmental Lapse Rate -Decrease in temp as altitude increases

Question 37

What is an Adiabatic process?

Answer 37

An Adiabatic process occurs when heat is neither added or lost from a system e.g. Change of altitude leads to temp change - expansion/compression of a gas. No heat added/removed however temp changes due to pressure

Question 38

Air cooled from below is considered:

Answer 38

STABLE

Question 39

Air warmed from below is considered:

Answer 39

UNSTABLE

Question 40

What is the name of processing of heating a solid into a gas?

Answer 40

Sublination

Question 41

What is the name of cooling a Gas into a Solid?

Answer 41

Deposition

Question 42

What is supercooling?

Answer 42

Very small droplets of water have increased curvature leading to decreased freezing temps below 0C

Question 43

What is Relative Humidity?

Answer 43

Degree of Saturation

Question 44

What is Dew point?

Answer 44

Temp of air needed to reach saturation

Question 45

What is Latent heat?

Answer 45

Heat released/absorbed when water changes state

Question 46

Define Altitude

Answer 46

Height above MSL

Question 47

Define Height

Answer 47

Height above ground

Question 48

Define Elevation

Answer 48

Height of ground above MSL

Question 49

What does flying into low pressure mean?

Answer 49

Altimeter reads high "High to low - look out below"

Question 50

What does flying into cooler air mean?

Answer 50

Altimeter reads high "Hot to low - look out below"

Question 51

How does a Mercury Barometer work?

Answer 51

Inverted vacuum filed tube, outside pressure pushes down on mercury in reservoir which pushes it into tube

Question 52

How does an Aneroid Barometer work?

Answer 52

Air tight capsule, pushed and pulled by pressure which moves dial

Question 53

How does a Digital barometer work?

Answer 53

Microchip sensitive to changes in capacity to conduct