Previous Exam Questions Flashcards by Tom Gilmour

Max height of a CB in km and ft

12km
40,0000
But can stretch up to

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Worst area for CAT in the vicinity of the polar jet stream is normally located

On the depression side

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Typical visibility in heavy rain

Around 100m (poss 50)

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Location of the roaring 40s

40-50s

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Hurricane average in the Atlantic

12 (around 10)

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Temp of the tropopause at 20km

-100

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What will clear orographic fog

Change in the airflow

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How tropical cyclones form east of Darwin each year

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Who prepares a SIGMET

A meteorological watch office

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How is water vapour content distributed

0g/m3 near the poles

25g/m3

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How often is windshear reported

Every min

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Satellites with the highest resolution

Polar orbiting

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Describe a routine air report and a special air report

AIREP is a routine report

PIREP is a special air report

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Satellite closest to earth

Polar orbiting

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Weather reported in a special air report

Ts, without hail that are obscured, embedded and widespread

(Not isolated CBs) heavy dust and sandstorms, volcanic ash cloud

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Visibility range for a heavy sandstorm

200m

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Characteristics of a cold air pool

Cold air at altitude and in abnormal locations

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Weather to expect from a cold air pool

Snow showers

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Can the katabatic effect cause a valley inversion

Yes

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What to do when flying through cirrus clouds to min the effect of ice crystal icing

Monitor for power fluctuations

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Cloud above the tropopause

Noctiluscent cloud in mesosphere
CBs
Overshooting tops

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Movement associated with a stationary front

Direction of straight isobars, <5kts

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Climate between 30 to 50 degrees

Temperate

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Conditions required for a mountain wave

Speed in excess of 20kts at mountain top, wind direction perpendicular to the range, stable conditions at the peak

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Number of TRS in E Australia

Slope of a cold front

1:80

Mixing ratio in tropical and polar air masses

Tropical 25g/kg Polar 0g/kg

Temp of a saturated parcel of air cools what happens to RH

Stays at 100%

Chart for identifying the subtropical jet stream

200hpa/39,000ft

How many volts are created by a lighting strike

200-500kv 2,000 ts active around the globe at one time creating 100 lighting strikes per second They will create a 500kv charge travelling through the ionosphere

For a 3 hour flight what is most useful pieces of met info

TAF valid at eta, SIGWX valid for eta, SIGMET valid for eta, current METAR inc trend, NOTAM

Max height of steam fog

Around 500ft

Speed of movement of a warm front

10kts

Tc air mass originates

South of France

Most likely to dissipate orographic fog

Down-sloping wind

Where do lightening strikes occur most frequently

Between CB and the ground

When to expect lee lows

Wind blowing north to south of an east to west ridge line

Best way to measure and identify CB cloud

IR and visual

In what conditions is the lowest useable FL safely at or above TA

Qnh greater than 1013 and temp greater than isa

Expected duration of amid latitude depression

Less than 4 days

Visibility in warm air mass

5-10km

What does white IR indicate

Cold temps so high cloud and visual indicates density

In mixed cloud ice particles are formed at the expense of

SCWD

Greatest potential difference found in a TS

Between the surface of the earth and the tops of the ts clouds as well and between different parts of the same cloud

What causes a global variation in the distribution of electrical charges in the ionosphere at the 500KV

Distribution of TS

Cold air pool is characterised by

Topographic depression filled with cold air

Height of steam fog

Less than 500ft

A secondary depression is frequently observed where?

On a cold front

Ground radar will detect

Rain and its intensity

Where is precipitation observed on a quasi stationary front

It is widespread in the cold air and there is slight precipitation along the front

What Harvard is evident with virga

Cold air downdrafts due to evaporation

What has the strongest effect on climatology

Differential ocean heating an currents above ENSO

Diameter of a TRS

500km

What satellite imagery is used for the tops of cumulus clouds

Infrared

Role of the MWO

Prepare warnings of hazardous weather conditions and issue warnings for windshear in the climbout and approach paths

9999

10km or greater

How is lightning formed

Electrical potential belong generated between the earths surface and the clouds

What is the distance and vertical extent of MTW

300nm and up to the tropopause

How long does a PFD take to build and its average duration

1-2 days and lasts for 3-4

Direction of sunrise

East and sets in the west

AIRMET

Low level warnings

Tropical rain climate

10* N and S

Savannah

10 to 25*, 1 wet season

Arid subtropical

20 to 35*, warm and dry

Warm temperate

Between 35 and 40* warm dry summers, cool dry winters due to PFD

Cool temperate

40 to 65* wet and windy, mostly effected by PFD

Boreal zone

40 and 60, in-between cold temperate and polar, biggest temperature variations

Polar

65 and 90, mostly frozen tundra with a mean temp below +10 throughout the year