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Which typical weather condition is shown by the design for the area of central ? [ MCQ aircraft ]

Question 155-1 : Westerly waves cutting wind easterly waves uniform pressure pattern

Admin .a series of fronts or depressions one after the other is referred to as a westerly wave over central euopre .these systems move in the direction of the first two isobars in the warm sector which tend to be straight and parallel when the cold and warm fronts begin to occlude the direction of movement is increasingly towards the pole exemple 255 Westerly waves.Westerly waves.

Which typical weather condition is shown by the design for northern italy . 316 ?

Question 155-2 : High pressure warm southerly wind westerly wind easterly wind

Admin .as we can see an anticyclone is located over italy exemple 259 High pressure.High pressure.

The attached chart shows the weather conditions on the ground at 1200 utc on ?

Question 155-3 : Taf lszh 101500z 1016/1101 vrb02kt 8000 nsc becmg 1016/1018 3500 mifg becmg 1018/1020 1500 bcfg becmg 1020/1022 0100 fg vv001= taf lszh 101500z 1016/1101 23012kt 6000 ra bkn012 ovc030 tempo 1020/1023 22025g40kt 1600 +snra bkn003 ovc015= taf lszh 101500z 1016/1101 32008kt 9999 sct030tcu tempo 1022/1101 32020g32kt 3000 tsra bkn020cb= taf lszh 101500z 1016/1101 05020g35kt 8000 bkn015 tempo 1017/1020 05018kt 0300 +shsn vv002=

Admin .we have a large flat pressure pattern an area with light or no wind zurich has therefore the lowest probability of precipitation .radiation fog will occur at night .radiation fog is formed by the cooling of land after sunset by thermal radiation in calm conditions with clear sky .no change in wind condition is expected for the next hours since the isohypses are well spaced exemple 263 Taf lszh 101500z 1016/1101 vrb02kt 8000 nsc becmg 1016/1018 3500 mifg becmg 1018/1020 1500 bcfg becmg 1020/1022 0100 fg vv001=Taf lszh 101500z 1016/1101 vrb02kt 8000 nsc becmg 1016/1018 3500 mifg becmg 1018/1020 1500 bcfg becmg 1020/1022 0100 fg vv001=

You are flying from east to west in the northern hemisphere at the 500 hpa ?

Question 155-4 : If the wind is from the north you are gaining altitude if the wind is from the south you are gaining altitude if you have a head wind you are gaining altitude if you have a tail wind you are losing altitude

Admin .if you stand with your back to the wind in the northern hemisphere low pressure is on your left buys ballot's law . 562.you are flying toward a high you are gaining altitude exemple 267 If the wind is from the north you are gaining altitude.If the wind is from the north you are gaining altitude.

Divergence in the upper air results near the surface in ?

Question 155-5 : Falling pressure and likely formation of clouds rising pressure and likely dissipation of clouds falling pressure and likely dissipation of clouds rising pressure and likely formation of clouds

Admin . 563.divergence in the upper air means convergence on the ground this a low pressure area and clouds may appears above it exemple 271 Falling pressure and likely formation of clouds.Falling pressure and likely formation of clouds.

In a low pressure system the convergence at the surface is caused by ?

Question 155-6 : Frictional forces centripetal forces the inbalance of the horizontal gradient force and the coriolis force the curvature of the isobars

Admin . 498.at the surface and at low elevations friction will slow the air and hence the coriolis will be less effective in its deflection of the wind .the flow turns across the isobars you have more flow into the low pressure system giving convergence and feeding the convection exemple 275 Frictional forces.Frictional forces.

If the pressure surfaces bulge upwards in all levels then the pressure system ?

Question 155-7 : Warm high cold low cold high warm low

Admin .if isobars bulge up in all level you have a high pressure at the surface and high temperatures in the air exemple 279 Warm high.Warm high.

A cold air pool ?

Question 155-8 : Is usually most evident in the circulation and temperature fields of the middle troposphere and may show little or no sign on a surface chart develops usually in winter when very unstable maritime polar or maritime arctic air currents stream southwards along the eastern side of an extensive ridge of high pressure in association with occluded systems normally disappears at night and occurs almost exclusively in summer occurs frequently in winter to the south of the alps when this region is under the influence of cold north westerly airstream

exemple 283 Is usually most evident in the circulation and temperature fields of the middle troposphere and may show little or no sign on a surface chartIs usually most evident in the circulation and temperature fields of the middle troposphere and may show little or no sign on a surface chart

The stable layer at some height in the low troposphere of an older high ?

Question 155-9 : Subsidence inversion friction inversion radiation inversion trade wind inversion

Admin .as the upper air sinks older high pressure subsides it warms . 570.this can lead to warmer air in the mid troposphere than at the surface this phenomenon is called subsidence inversion exemple 287 Subsidence inversion.Subsidence inversion.

A blocking anticyclone in the northern hemisphere is ?

Question 155-10 : A warm anticyclone quasi stationary situated between 50°n and 70°n quasi stationary situated between 50°n and 70°n a cold anticyclone situated between 50°n and 70°n a cold anticyclone steering depressions a cold anticyclone steering depressions situated over scandinavia

Admin .the blocking anticyclones in the northern hemisphere are over the oceans these are parts of the belt of sub tropical high pressure formed over relatively warm ocean surfaces .they block the path of atlantic depressions exemple 291 A warm anticyclone, quasi stationary, situated between 50°n and 70°n.A warm anticyclone, quasi stationary, situated between 50°n and 70°n.

Which statement is true for hurricanes in the north atlantic ?

Question 155-11 : From the earth's surface up to the tropopause the core is warmer than its surroundings they intensify rapidly after landfall the diameter is 50 500 m their greatest frequency of occurrence is in winter

exemple 295 From the earth's surface up to the tropopause the core is warmer than its surroundings.From the earth's surface up to the tropopause the core is warmer than its surroundings.

Assume that an aircraft is flying in the northern hemisphere at the 500 hpa ?

Question 155-12 : If in this pressure surface the wind comes from the direction 360 degrees then true altitude is increasing if in this pressure surface the wind comes from the direction 180 degrees then true altitude is increasing if in this pressure surface the wind comes from the direction 270 degrees then true altitude is increasing if in this pressure surface the wind comes from the direction 090 degrees then true altitude is increasing

Admin .if you stand with your back to the wind in the northern hemisphere low pressure is on your left .with a wind coming from the direction 360 degrees and you stand with your back to it low pressure is on the east .on a heading of 270 degrees we are flying towards high pressure thus true altitude is increasing exemple 299 If in this pressure surface the wind comes from the direction 360 degrees, then true altitude is increasing.If in this pressure surface the wind comes from the direction 360 degrees, then true altitude is increasing.

An aircraft is flying at fl 180 in the northern hemisphere with a crosswind ?

Question 155-13 : It decreases it increases it remains constant without knowing temperatures at fl 180 this question can not be answered

Admin .if you stand with your back to the wind in the northern hemisphere low pressure is on your left buys ballot's law . 573.with a crosswind to the left must mean you are heading into an area with a lower temperature our true altitude decreases exemple 303 It decreases.It decreases.

Which of the following is true concerning an aircraft that is flying at fl180 ?

Question 155-14 : There is no cross wind there is a cross wind from the left there is a cross wind from the right without knowing temperature at fl 180 this question can not be answered

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 .if there is no change in your true altitude you are flying along the isobars so you will have a headwind or a tailwind but no crosswind exemple 307 There is no cross wind.There is no cross wind.

The reason for the fact that the atmospheric pressure of a polar front ?

Question 155-15 : The temperature contrasts between arctic and equatorial areas are much greater in winter the low pressure activity of the sea east of canada is higher in winter the strong winds of the north atlantic in winter are favourable for the development of lows converging air currents are of greater intensity in winter

Admin .the warm air is fairly consistent throughout the year but the cold air is much colder in the winter exemple 311 The temperature contrasts between arctic and equatorial areas are much greater in winter.The temperature contrasts between arctic and equatorial areas are much greater in winter.

In which of the following areas do surface high pressure systems usually ?

Question 155-16 : Azores se usa sw europe greenland azores ne canada iceland sw usa azores greenland sw europe ne canada

Admin .from winter to summer the polar front over the north atlantic moves towards the north . 598.between 30°n and 65°n in winter . low pressure systems centered over iceland / greenland . high pressure systems centered over azores siberia . the polar front extends from florida to sw england .between 30°n and 65°n in summer . low pressure systems centered over ne canada . high pressure systems centered over azores se usa sw europe . the polar front extends from newfoundland to n scotland exemple 315 Azores, se usa, sw europe.Azores, se usa, sw europe.

In the northern hemisphere with an anticyclonic pressure system the geostrophic ?

Question 155-17 : 340°/20 kt 030°/20 kt 340°/28 kt 030°/28 kt

Admin .values to be used in examinations .over sea wind speed in friction layer decrease by 30% the wind in the friction layer blows across the isobars towards the low pressure angle between wind direction and isobars changes by 10°.over land wind speed in friction layer decrease by 50% the wind in the friction layer blows across the isobars towards the low pressure angle between wind direction and isobars changes by 30° .the wind blows parallel to the isobars and in the northern hemisphere the surface wind will back and slowdown compared to it exemple 319 340°/20 kt.340°/20 kt.

Select the answer which you consider will complete correctly the following ?

Question 155-18 : Iceland / greenland usa siberia azores

Admin .from summer to winter the polar front over the north atlantic moves towards the south . 585.between 30°n and 65°n in winter . low pressure systems centered over iceland / greenland . high pressure systems centered over azores siberia . the polar front extends from florida to sw england .between 30°n and 65°n in summer . low pressure systems centered over ne canada . high pressure systems centered over azores se usa sw europe . the polar front extends from newfoundland to n scotland exemple 323 Iceland / greenland.Iceland / greenland.

The pressure system at position 'd' is . 319 ?

Question 155-19 : A col a secondary low a trough of low pressure a ridge of high pressure

Admin .a col is an area of almost uniform pressure between two highs and two lows no isobars define its boundary . 586 exemple 327 A col.A col.

Considering the north atlantic region between 30°n and 65°n and the adjacent ?

Question 155-20 : Azores high and weak low over ne canada scandinavian high and azores high weak low over ne canada and scandinavian high azores low and icelandic high

Admin .from winter to summer the polar front over the north atlantic moves towards the north . 598.between 30°n and 65°n in winter . low pressure systems centered over iceland / greenland . high pressure systems centered over azores siberia . the polar front extends from florida to sw england .between 30°n and 65°n in summer . low pressure systems centered over ne canada . high pressure systems centered over azores se usa sw europe . the polar front extends from newfoundland to n scotland exemple 331 Azores high and weak low over ne canada.Azores high and weak low over ne canada.

Considering the north atlantic region between 30°n and 65°n together with the ?

Question 155-21 : Azores siberia siberia iceland canaries ne canada iceland greenland iberian peninsula

Admin .from summer to winter the polar front over the north atlantic moves towards the south . 585.between 30°n and 65°n in winter . low pressure systems centered over iceland / greenland . high pressure systems centered over azores siberia . the polar front extends from florida to sw england .between 30°n and 65°n in summer . low pressure systems centered over ne canada . high pressure systems centered over azores se usa sw europe . the polar front extends from newfoundland to n scotland exemple 335 Azores, siberia.Azores, siberia.

The arrows labelled 'r' represent the mean tracks of tropical revolving storms ?

Question 155-22 : December to april and are called cyclones december to april and are called tornadoes june to october and are called typhoons june to october and are called hurricanes

exemple 339 December to april and are called cyclonesDecember to april and are called cyclones

Which is true of a secondary depression in the northern hemisphere ?

Question 155-23 : It tends to move round the primary in a cyclonic sense it tends to move round the primary in an anticyclonic sense it rapidly closes on and merges with the primary it tends to maintain its position relative to the primary

Admin .wave depressions can grow off the tail ends of primary cold fronts the depression so formed is then called a secondary depression . 587.this smaller secondary depression moves around the main depression anti clockwise in the northern hemisphere and clockwise in the southern hemisphere .'cyclonic sense' = cyclone = low = counter clockwise exemple 343 It tends to move round the primary in a cyclonic sense.It tends to move round the primary in a cyclonic sense.

The arrows labelled 's' represent the mean tracks of tropical revolving storms ?

Question 155-24 : May to november and are called cyclones december to april and are called cyclones may to november and are called hurricanes december to april and are called typhoons

Admin . 588 exemple 347 May to november and are called cyclones.May to november and are called cyclones.

The arrows labelled 't' represents the mean track of tropical revolving storms ?

Question 155-25 : June to october and are called cyclones december to april and are called hurricanes june to october and are called tornadoes june to october and are called hurricanes

Admin . 588 exemple 351 June to october and are called cyclones.June to october and are called cyclones.

The arrows labelled 'u' represent the tracks of tropical revolving storms which ?

Question 155-26 : July to october and are called typhoons january to march and are called willy willies may to july and are called cyclones december to april and are called tornadoes

Admin . 588 exemple 355 July to october and are called typhoons.July to october and are called typhoons.

When if at all is a tropical revolving storm most likely to affect darwin on ?

Question 155-27 : December to april may to july august to october not experienced at darwin

Admin .the formation of tropical revolving storms requires high sea surface temperatures 26°c or more and these will occur at and just after the passage of the itcz the itcz reaches its most southerly position in january . 593.red lines show the maximum extreme positions .the peak season for southern hemisphere tropical revolving storms is december to april exemple 359 December to april.December to april.

A trough of low pressure on a surface synoptic chart is an area of ?

Question 155-28 : Convergence and widespread ascent divergence and subsidence divergence and widespread ascent convergence and subsidence

Admin .a pressure system in which the isobars around a low pressure become elongated such that the pressure is lower along the axes of the trough than on its two sides sometimes the isobars at a trough have a pronounced v shape active weather fronts always lie in troughs but not all troughs are frontal . 594.the air in the centre of a low pressure centre trough or heat trough is lifted by convergence and widespread ascent as is the air in the intertropical convergence zone exemple 363 Convergence and widespread ascent.Convergence and widespread ascent.

Which is true of a typical non frontal thermal depression ?

Question 155-29 : It forms over land in summer it forms over the ocean in summer it forms over the ocean in winter it forms over land in winter

Admin .the ocean surface temperature changes are relatively small between summer and winter .in winter cold land creates subsidence and increasing surface pressure .in summer the land warms causing convective lifting divergence at altitude and falling surface pressure non frontal thermal depressions form over land in summer exemple 367 It forms over land in summer.It forms over land in summer.

During summer an anticyclone covers the british isles giving mainly clear skies ?

Question 155-30 : Become southerly to southwesterly and increase in velocity by afternoon back to nw and strengthen by mid afternoon increase from the north by mid morning becoming calm towards evening veer to easterly before becoming calm by the afternoon

Admin .here is the situation . 599.we have a northerly land breeze during the night land is cold sea is warm . 600.during the day as the land heats up we are in summer the situation reverses and the wind will blow from the sea sea breeze from the south . 601.as we are in northern hemisphere the coriolis force will tend to turn it westerly exemple 371 Become southerly to southwesterly and increase in velocity by afternoon.Become southerly to southwesterly and increase in velocity by afternoon.

During summer a weak pressure gradient covers a coastal airfield in eastern ?

Question 155-31 : Easterly to southeasterly and increase in velocitiy by afternoon easterly and then westerly by afternoon westerly and increase in velocity by afternoon westerly and then southerly by evening

Admin .during a sunny summer day sea breeze is likely to occur . 601.this will initially be an easterly from sea to land and as it increases in strength during the afternoon coriolis will deflect it to the right in the northern hemisphere and it will become a southeasterly exemple 375 Easterly to southeasterly and increase in velocitiy by afternoon.Easterly to southeasterly and increase in velocitiy by afternoon.

For the same horizontal distance between adjacent isobars the gradient wind ?

Question 155-32 : 50°n with a cyclonic circulation 50°n in an anticyclone 30°n with a cyclonic circulation 30°n in an anticyclone

Admin .first of all you have to uinderstand that the effect of the coriolis force varies with latitudes . 566.with the curvatures of the isobars centrifugal force is introduced and always tries to throw the parcel of air outwards from the centre of its rotation and the resulting movement of air is called the gradient wind . green arrow = pgf pressure gradient force . red arrow = coriolis force . 583.with an area of high pressure anticyclone the centrifugal force is acting in the same direction as pgf effectively increasing it coriolis balances the total force pgf + centrifugal force and the gradient wind is 'high round a high' i e for a given gap between the isobars the gradient wind is stronger than the geostrophic wind .with an area of low pressure cyclonic circulation the centrifugal force is opposing the pgf effectively decreasing it coriolis balances the total force pgf centrifugal force and the gradient wind is 'low round a low' i e for a given gap between the isobars the gradient wind is weaker than the geostrophic wind .for a given space between the isobars given pressure gradient you will get the least wind speed around a low cyclonic circulation at high latitude exemple 379 50°n with a cyclonic circulation.50°n with a cyclonic circulation.

Over which areas can tropical cyclones occur ?

Question 155-33 : Caribbean sea gulf of bengal indian ocean east of madagascar india arabic sea atlantic ocean at 2°s australia gulf of bengal atlantic ocean at 20°s caribbean sea indian ocean at 20°s pacific ocean at 2°n

Admin .no tropical cyclones over lands neither over cold water such as north atlantic or oriental pacific .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. caribbean sea gulf of bengal indian ocean east of madagascar is the only valid answer exemple 383 Caribbean sea, gulf of bengal, indian ocean east of madagascar.Caribbean sea, gulf of bengal, indian ocean east of madagascar.

The hurricane season in the caribbean is mainly from ?

Question 155-34 : July until november october until january january until april april until july

Admin . 510.map showing areas affected by hurricanes in the caribbean area in summer and autumn 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 387 July until november.July until november.

Which statement about hurricanes in the north atlantic is correct ?

Question 155-35 : Their eye can be well observed by weather satellites they intensify after landfall they move towards the equator they move with a speed of at least 60 kt

exemple 391 Their eye can be well observed by weather satellitesTheir eye can be well observed by weather satellites

You are flying at fl 340 250 hpa on the northern hemisphere .the wind is ?

Question 155-36 : Increase decrease decrease only if the pressure at the surface is decreasing on your route increase only if the temperature at your flight level is rising on your route

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 395 Increase.Increase.

You are flying in the northern hemisphere at 2000 ft over a flat country area ?

Question 155-37 : From your right from your left from ahead from behind

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 399 From your right.From your right.

Why do tropical revolving storms tend to develop mostly in the western parts of ?

Question 155-38 : Because there is a maximum of humidity as a result of the trade winds long sea passage because they are areas in which there is a strong progressive wind shear with increase of height because there is a maximal temperature difference between land mass and sea because the gulf formation of the coastlines triggers a strong rotary circulation

exemple 403 Because there is a maximum of humidity as a result of the trade winds long sea passageBecause there is a maximum of humidity as a result of the trade winds long sea passage

Over the indian ocean and the bay of bengal tropical cyclones are ?

Question 155-39 : Occasionally observed in the average 12 per year rare in the average one every two years never observed frequently observed in the average 15 per year over the indian ocean but never over the bay of bengal

exemple 407 Occasionally observed, in the average 12 per year.Occasionally observed, in the average 12 per year.

Tropical revolving storms are not formed in ?

Question 155-40 : South atlantic ocean gulf of bengal waters around the philippines south indian ocean

exemple 411 South atlantic ocean.South atlantic ocean.

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