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Question 158-1 : You are flying at fl 340 250 hpa on the northern hemisphere .the wind is geostrophic and there is a cross wind from the right all the time .your true altitude will ? [ Learning aircraft ]

Increase

Admin .we have a geostrophic wind when the pressure gradient force pgf is exactly balanced by coriolis force . 582.it is only happens when isobars are straights and parallels .with a cross wind from the right there must be low pressure behind and high pressure ahead you true altitude will increase air mass is warmer exemple 258 Increase.

Question 158-2 : You are flying in the northern hemisphere at 2000 ft over a flat country area an anticyclone is ahead of you and a depression is behind you the wind affecting you will be ?

From your right

Admin .if you stand with your back to the wind in the northern hemisphere low pressure is on your left high pressure is on your right buys ballot's law . 608.if you face the high pressure the wind affecting you will be from your right exemple 262 From your right.

Question 158-3 : Why do tropical revolving storms tend to develop mostly in the western parts of the tropical oceans ?

Because there is a maximum of humidity as a result of the trade winds long sea passage

exemple 266 Because there is a maximum of humidity as a result of the trade winds long sea passage

Question 158-4 : Over the indian ocean and the bay of bengal tropical cyclones are ?

Occasionally observed in the average 12 per year

exemple 270 Occasionally observed, in the average 12 per year.

Question 158-5 : Tropical revolving storms are not formed in ?

South atlantic ocean

exemple 274 South atlantic ocean.

Question 158-6 : Between which latitudes are you most likely to find the region of travelling low pressure systems during summer ?

45° 70°

Admin . 584 exemple 278 45° - 70°.

Question 158-7 : A stationary observer in the northern hemisphere is situated in front of a depression the centre of the depression passes from west to east and south of the observer .for this observer the wind ?

Backs

Admin . 627.if the centre of the depression passes to the south of your position in the northern hemisphere the wind will change from south to nord passing by east a backing wind is a wind that turns counter clockwise exemple 282 Backs.

Question 158-8 : The region of the globe where the greatest number of tropical revolving storms occur is ?

The north west pacific affecting japan taiwan korea and the chinese coastline

Admin . 588.the season for typhoons tropical revolving storms in north western pacific ocean extends from summer to autumn exemple 286 The north-west pacific, affecting japan, taiwan, korea and the chinese coastline.

Question 158-9 : Which of the following statements is correct ?

At the equator horizontal motions do not induce any horizontal coriolis force

exemple 290 At the equator horizontal motions do not induce any horizontal coriolis force

Question 158-10 : In the middle of the eye of a hurricane the wind speed is ?

Lower than 63 knots and the air is descending

Admin .the center or eye of a hurricane is relatively calm the most violent activity takes place in the area immediately around the eye called the eyewall .at the top of the eyewall about 50000 feet most of the air is propelled outward increasing the air's upward motion some of the air however moves inward and sinks into the eye creating a cloud free area .a hurricane is an intense tropical weather system with a well defined circulation and maximum sustained winds of 64 knots or higher thus in the middle of the eye the wind speed is lower than 63 knots and the air is descending exemple 294 Lower than 63 knots and the air is descending.

Question 158-11 : The geographical area where the frequency of the tropical revolving storms is highest is ?

South of chinese sea and philippines

Admin . 588.the season for typhoons tropical revolving storms in north western pacific ocean extends from summer to autumn exemple 298 South of chinese sea and philippines.

Question 158-12 : Which of the following is correct regarding a warm anticyclone ?

It increases in intensity with increasing altitude

Admin .there are two main types of anticyclone a cold and warm anticyclone cold anticyclones form typically over polar climates here temperatures are very low and the air is often cold and dense an inversion tends to develop at low altitudes with anticyclones this prevents clouds from building any further if this is so any cumulus which does form during the daytime will quickly stop growing and spread into a layer of stratocumulus and then disperse when night comes at night when the temperatures drop below freezing frosts are very likely to form .warm anticyclones form mainly over tropical or sub tropical climates where temperatures are often warm both at day and night with these highs air is subsiding at quite a depth through the troposphere this tends to hold back and restrict any cloud formation if any cloud do form they will often be erratic and well broken these being mainly cumulus and stratocumulus exemple 302 It increases in intensity with increasing altitude.

Question 158-13 : The arrows labelled 'v' represent the mean tracks of tropical revolving storms which occur mainly from . 386 ?

December to april and are called cyclones

Cyclone from greek 'kuklos' means 'circle' is a generic term for all tropical revolving storms according to the geographical location the terminology differs . cylcone in the south western and northern pacific ocean and the south western indian ocean . hurricane as derived from huracàn a taino and carib god or hunraken the mayan storm in the northern atlantic ocean and the north eastern and south western pacific ocean east of 160e . typhoon from chinese t'ai fung located in in the north western pacific ocean . 603. exemple 306 December to april and are called cyclones.

Question 158-14 : In the north atlantic you can often see a series of depressions located in a row and travelling from west to east these depressions ?

Are normally generated at the polar front

Easa 2014..polar front depressions which develop due to the polar front and cause bad weather conditions from the surface to the tropopause move from the atlantic towards europe their tracks are variable .regions located south of each depression experience frontal weather exemple 310 Are normally generated at the polar front.

Question 158-15 : What are the typical weather conditions in an area with a flat pressure pattern in summer ?

Generally fine weather possibly thunderstorms in the afternoon or evening

Easa 2014 ..during summer in the centre of a stationary high pressure zone = flat pressure pattern we have light or no wind . 492.thunderstorms may occur in the summer months in the afternoon or evening due to convective activity the land warms causing convective lifting = cb exemple 314 Generally fine weather, possibly thunderstorms in the afternoon or evening.

Question 158-16 : What change in pressure will occur at point b during the next hour . 392 ?

Approximately constant pressure

Easa 2014..without a scale we can't tell if the cold front will pass through this position during the next hour but the question statement is during the next hour not 'in one hour' .spacing of isobars at point b and in front of the cold front are the same therefore the pressure will not change during the next hour .in about one and a half hours we can expect to see a drop in temperature and pressure exemple 318 Approximately constant pressure.

Question 158-17 : A stationary observer in the northern hemisphere is situated in front of a depression the centre of the depression passes from west to east and north of the observer for this observer the wind direction is ?

Veering

Ecqb03 july 2016 .warning looks like q978 but the center of the depression passes north of the observer in q978 it passes south .. 567.a weering wind is a wind that turns clockwise .a backing wind is a wind that turns counter clockwise exemple 322 Veering.

Question 158-18 : The eye of a hurricane ?

Extends from the surface to the top of the hurricane

exemple 326 Extends from the surface to the top of the hurricane.

Question 158-19 : What type of clouds visible even at a long distance could indicate the presence of a tropical revolving storm ?

Dense cirrus ci

exemple 330 Dense cirrus (ci).

Question 158-20 : Assuming a generalised zonal system of world wind circulation the travelling low pressure systems are applicable to zone . 399 ?

S and y

Revised ecqb04 january 2018 exemple 334 S and y.

Question 158-21 : Troughs are extensions of ?

Low pressure areas and generally have large amounts of cloud

exemple 338 Low pressure areas and generally have large amounts of cloud.

Question 158-22 : Refer to the chart 050 10850a the pressure system essentially located in square 2a is . 413 ?

A ridge

exemple 342 A ridge.

Question 158-23 : An aircraft is flying from point a to point b at the flight level corresponding to the pressure surface of the constant pressure chart which of the following statements is correct . 417 ?

The true altitude will be higher over b than over a

Admin . 485.you are flying at a 'constant indicated altitude' since your altimeter setting is 1013 2 hpa .but you are flying to an aera where pressure is stronger your true altitude will be higher exemple 346 The true altitude will be higher over b than over a.

Question 158-24 : Refer to annex 050 10720a .assuming a generalised zonal system of world climatic and wind circulation zone 'x' is an area of . 422 ?

Subtropical high pressure systems

Ecqb04 january 2018 .. 584 exemple 350 Subtropical high pressure systems.

Question 158-25 : In temperate latitudes what weather conditions may be expected over land during the summer in the centre of a stationary high pressure zone ?

Calm winds haze

Admin .during summer in the centre of a stationary high pressure zone = large flat pressure pattern we have light or no wind . 492.haze is an atmospheric phenomenon where dust smoke and other dry particles obscure the clarity of the sky exemple 354 Calm winds, haze.

Question 158-26 : Which weather phenomena are typical for the northern side of the alps with strong winds from the south foehn ?

Good visibility turbulence

Admin . 520.the southerly wind will give a foehn 'from south' clouds on the southern side good visibility on the northern side but turbulence due to the orographic waves and rotors . 610 exemple 358 Good visibility, turbulence.

Question 158-27 : What weather is prevalent in easterly waves ?

Thunderstorms and rain

Admin .easterly waves are 'long waves' that occur within the trade wind belt start over north western africa and propagate toward the west in the lower tropospheric tradewind flow across the atlantic ocean .approximate location amplitude and wavelength of easterly waves . 495.at first an easterly wave has a small amplitude and produces mild rain showers powerful thunderstorms and the force of high altitude winds amplify the wave when atmospheric conditions are favourable several severe thunderstorms begin to form and eventually a tropical storm may develop exemple 362 Thunderstorms and rain.

Question 158-28 : Assuming the usual direction of movement to which position will the polar frontal wave have moved . 251 ?

Position 3

Admin . 496.the isobars in the warm sector tend to be parallel and straight and give an indication in the direction of the system until it occludes exemple 366 Position 3.

Question 158-29 : Under the weather conditions depicted which of the following statements is likely to apply . 252 ?

Thunderstorms may occur in the summer months over central europe

Admin .over central europe you will certainly experience thunderstorms in the summer months and radiation fog in the winter but we do not have enough informations to guess the foehn intensity over the alps and definitively as the isohypses are well spaced severe gradient wind is unlikely to be encounter exemple 370 Thunderstorms may occur in the summer months over central europe.

Question 158-30 : For an aircraft what are the meteorological dangers associated with a harmattan wind ?

Dust and poor visibility

exemple 374 Dust and poor visibility.

Question 158-31 : What is the strong relatively cold katabatic wind blowing down the northern adriatic coast mainly during the winter and spring called ?

Bora

Admin .the bora comes from the yugoslavian mountains to the adriatic sea it is a katabatic wind meaning 'going downhill' which means that it is cold dry and often strong .the air from the bora wind comes from the top of the mountains and it is set in motion because of the warmth below because the wind moves down the mountain it strengthens .the bora develops during the winter the word 'bora' means wind from the mountain in greek greece lies just below yugoslavia exemple 378 Bora.

Question 158-32 : Which one of the following statements regarding the intertropical convergence zone itcz is correct ?

Frequent and widespread thunderstorms are to be expected within the area of the itcz

exemple 382 Frequent and widespread thunderstorms are to be expected within the area of the itcz.

Question 158-33 : In which of the following bands of latitude is the intertropical convergence zone most likely to be encountered in january between dakar and rio de janeiro ?

0° 7°n

.in january the itcz between dakar and rio de janeiro is most likely to be encountered between 0° et 7°n . 593.red lines show the maximum extreme positions exemple 386 0° - 7°n.

Question 158-34 : When are the rainy seasons in equatorial africa ?

March to may and october to november

.the rain is associated with the itcz which follows the sun and the sun crosses the equator at the equinoxes end of march end of september exemple 390 March to may and october to november.

Question 158-35 : Which of the following best describes the intertropical convergence zone ?

The zone where the trade winds of the northern hemisphere meet those of the southern hemisphere

. 596 exemple 394 The zone where the trade winds of the northern hemisphere meet those of the southern hemisphere.

Question 158-36 : What is the likely track for a hurricane in the caribbean area ?

West in the earlier stages and later turning north east

Admin . 510.map showing areas affected by hurricanes in the caribbean area exemple 398 West in the earlier stages and later turning north east.

Question 158-37 : During which seasons are hurricanes most likely to appear in the northern hemisphere ?

Summer and autumn

Admin .the atlantic hurricane season runs from june 1st to november 30th the atlantic basin includes the atlantic ocean caribbean sea and gulf of mexico exemple 402 Summer and autumn.

Question 158-38 : At what time of the year are typhoons most likely to occur over the southern islands of japan ?

July to november

Admin . 588.the season for typhoons tropical revolving storms in north western pacific ocean extends from summer to autumn exemple 406 July to november.

Question 158-39 : On which coast of north america is the danger of tropical revolving storms the greatest ?

Se coast

Admin . 510.tracks of atlantic tropical cyclones from 1851 to 2005 . 519.the danger is the greatest along the south east coast including mexican gulf and new orleans louisiana mississippi florida .tropical revolving storms are called 'hurricanes' in the northern atlantic ocean and the north eastern and south western pacific ocean east of 160e exemple 410 Se coast.

Question 158-40 : What is characteristic of the pamperos ?

A marked advance of cold air in south america

exemple 414 A marked advance of cold air in south america


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