What is the main energy source of a tropical revolving storm ?
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During July flights from Bangkok 13°N 100°E to Karachi 25°N 67°E experience an average tailwind component of 22 kt In January the same flights also operating at FL 370 have an average headwind ?
Which typical weather condition is shown by the design for the area of Central Europe 315 ?
Which typical weather condition shown the design northern italy 316 The wind components correspond to seasonal change of regional wind system. as we can see an anticyclone located over italy. 
The attached chart shows weather conditions on ground at 1200 utc on october 10 which of following reports reflects weather development at zurich airport 317 Taf lszh 5 z 6/ vrb 2kt 8 nsc becmg 6/ 8 35 mifg becmg 8/ 2 5 bcfg becmg 2 / 22 fg vv =. we have a large flat pressure pattern (an area with light or no wind) zurich has therefore lowest probability of precipitation radiation fog will occur at night radiation fog formed the cooling of land after sunset thermal radiation in calm conditions with clear sky no change in wind condition expected the next hours since isohypses are well spaced. 
You are flying from east to west in northern hemisphere at 500 hpa pressure surface which of following statements correct If wind from north you are gaining altitude. if you stand with your back to wind in northern hemisphere low pressure on your left (buys ballot's law) you are flying toward a high you are gaining altitude. 
Divergence in upper air results near surface in Falling pressure likely formation of clouds. divergence in upper air means convergence on ground this a low pressure area clouds may appears above it. Question 141-8
In a low pressure system convergence at surface caused Falling pressure likely formation of clouds. at surface at low elevations friction will slow air hence coriolis will be less effective in its deflection of wind the flow turns across isobars you have more flow into low pressure system giving convergence feeding convection. Question 141-9
If pressure surfaces bulge upwards in all levels then pressure system a Falling pressure likely formation of clouds. if isobars bulge up in all level you have a high pressure at surface high temperatures in air. Question 141-10
A cold air pool Is usually most evident in circulation temperature fields of middle troposphere may show little or no sign on a surface chart. if isobars bulge up in all level you have a high pressure at surface high temperatures in air. Question 141-11
The stable layer at some height in low troposphere of an older high pressure area in mid latitudes called Subsidence inversion. as upper air sinks (older high pressure subsides) it warms this can lead to warmer air in mid troposphere than at surface this phenomenon called subsidence inversion. Question 141-12
A blocking anticyclone in northern hemisphere A warm anticyclone quasi stationary situated between 5 °n 7 °n. the blocking anticyclones in northern hemisphere are over oceans these are parts of belt of sub tropical high pressure formed over relatively warm ocean surfaces they block path of atlantic depressions. Question 141-13
Which statement true hurricanes in north atlantic From earth's surface up to tropopause core warmer than its surroundings. the blocking anticyclones in northern hemisphere are over oceans these are parts of belt of sub tropical high pressure formed over relatively warm ocean surfaces they block path of atlantic depressions. Question 141-14
Assume that an aircraft flying in northern hemisphere at 500 hpa pressure surface on a heading of 270 degrees which of following statements correct If in this pressure surface wind comes from direction 36 degrees then true altitude increasing. if you stand with your back to wind in northern hemisphere low pressure on your left with a wind coming from direction 360 degrees you stand with your back to it low pressure on east on a heading of 270 degrees we are flying towards high pressure thus true altitude increasing. Question 141-15
An aircraft flying at fl 180 in northern hemisphere with a crosswind from left which of following correct concerning its true altitude If in this pressure surface wind comes from direction 36 degrees then true altitude increasing. if you stand with your back to wind in northern hemisphere low pressure on your left (buys ballot's law) with a crosswind to left must mean you are heading into an area with a lower temperature our true altitude decreases. Question 141-16
Which of following true concerning an aircraft that flying at fl180 in northern hemisphere where wind geostrophic and true altitude remains constant If in this pressure surface wind comes from direction 36 degrees then true altitude increasing. we have a geostrophic wind when pressure gradient force (pgf) exactly balanced coriolis force it only happens when isobars are straights parallels if there no change in your true altitude you are flying along isobars so you will have a headwind or a tailwind but no crosswind. Question 141-17
The reason the fact that atmospheric pressure of a polar front depression normally lower in winter than in summer that The temperature contrasts between arctic equatorial areas are much greater in winter. the warm air fairly consistent throughout year but cold air much colder in winter. Question 141-18
In which of following areas do surface high pressure systems usually predominate over north atlantic region between 30°n and 65°n and adjoining land areas during northern summer Azores se usa sw europe. from winter to summer polar front over north atlantic moves towards north between 30°n 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 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. Question 141-19
In northern hemisphere with an anticyclonic pressure system geostrophic wind at 2000 ft over sea 350°/24 kt at same position surface wind most likely to be Azores se usa sw europe. values to be used in examinations over sea wind speed in friction layer decrease 30% wind in friction layer blows across isobars towards low pressure angle between wind direction isobars changes 10° over land wind speed in friction layer decrease 50% wind in friction layer blows across isobars towards low pressure angle between wind direction isobars changes 30° the wind blows parallel to isobars in northern hemisphere surface wind will back slowdown compared to it. Question 141-20
Select answer which you consider will complete correctly following statement in relation to main pressure systems affecting north atlantic region between 30°n and 65°n during winter predominant mean low pressure system at surface Azores se usa sw europe. from summer to winter polar front over north atlantic moves towards south between 30°n 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 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. Question 141-21
The pressure system at position ' 319 Azores se usa sw europe. a col an area of almost uniform pressure between two highs two lows no isobars define its boundary . Question 141-22
Considering north atlantic region between 30°n and 65°n and adjacent land areas during mid summer predominant pressure systems are Azores high weak low over ne canada. from winter to summer polar front over north atlantic moves towards north between 30°n 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 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. Question 141-23
Considering north atlantic region between 30°n and 65°n together with adjacent land areas during winter normal disposition of main anticyclones at surface Azores high weak low over ne canada. from summer to winter polar front over north atlantic moves towards south between 30°n 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 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. Question 141-24
The arrows labelled 'r' represent mean tracks of tropical revolving storms which occur mainly from 320 December to april are called cyclones. from summer to winter polar front over north atlantic moves towards south between 30°n 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 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. Question 141-25
Which true of a secondary depression in northern hemisphere It tends to move round primary in a cyclonic sense. wave depressions can grow off tail ends of primary cold fronts the depression so formed then called a secondary depression this smaller secondary depression moves around main depression anti clockwise in northern hemisphere clockwise in southern hemisphere 'cyclonic sense' = cyclone = low = counter clockwise. Question 141-26
The arrows labelled ' represent mean tracks of tropical revolving storms which occur mainly from 320 May to november are called cyclones. . Question 141-27
The arrows labelled 't' represents mean track of tropical revolving storms which occur mainly from 320 June to october are called cyclones. . Question 141-28
The arrows labelled 'u' represent tracks of tropical revolving storms which occur mainly from 320 July to october are called typhoons. . Question 141-29
When if at all a tropical revolving storm most likely to affect darwin on central north coast of australia July to october are called typhoons. the formation of tropical revolving storms requires high sea surface temperatures (26°c or more) these will occur at just after passage of itcz the itcz reaches its most southerly position in january red lines show maximum (extreme) positions the peak season southern hemisphere tropical revolving storms december to april. Question 141-30
A trough of low pressure on a surface synoptic chart an area of Convergence widespread ascent. a pressure system in which isobars around a low pressure become elongated such that pressure lower along axes of trough than on its two sides sometimes isobars at a trough have a pronounced v shape active weather fronts always lie in troughs but not all troughs are frontal the air in centre of a low pressure centre trough or heat trough lifted convergence widespread ascent as the air in intertropical convergence zone. Question 141-31
Which true of a typical non frontal thermal depression It forms over land in summer. the ocean surface temperature changes are relatively small between summer winter in winter cold land creates subsidence increasing surface pressure in summer land warms causing convective lifting divergence at altitude falling surface pressure non frontal thermal depressions form over land in summer. Question 141-32
During summer an anticyclone covers british isles giving mainly clear skies at 0600 utc a south coast airfield in southern england reports a surface wind of 350/06 the coastline at airfield perimeter aligned in an east/west direction during next twelve hours surface wind likely to Become southerly to southwesterly increase in velocity afternoon. here the situation we have a northerly land breeze during night (land cold sea warm) during day as land heats up (we are in summer) situation reverses the wind will blow from sea (sea breeze from south) as we are in northern hemisphere coriolis force will tend to turn it westerly. Question 141-33
During summer a weak pressure gradient covers a coastal airfield in eastern england resulting in mainly clear skies the surface wind at dawn was calm if alignment of coastline in vicinity of airfield predominantly north/south surface wind direction likely to become Easterly to southeasterly increase in velocitiy afternoon. during a sunny summer day sea breeze likely to occur this will initially be an easterly (from sea to land) as it increases in strength during afternoon coriolis will deflect it to right in northern hemisphere it will become a southeasterly. Question 141-34
For same horizontal distance between adjacent isobars gradient wind speed will be least at 5 °n with a cyclonic circulation. first of all you have to uinderstand that effect of coriolis force varies with latitudes with curvatures of isobars centrifugal force introduced always tries to throw parcel of air outwards from centre of its rotation the resulting movement of air called gradient wind (green arrow = pgf pressure gradient force) (red arrow = coriolis force) with an area of high pressure (anticyclone) centrifugal force acting in same direction as pgf effectively increasing it coriolis balances total force (pgf + centrifugal force) the gradient wind 'high round a high' (i e a given gap between isobars gradient wind stronger than geostrophic wind) with an area of low pressure (cyclonic circulation) centrifugal force opposing pgf effectively decreasing it coriolis balances total force (pgf centrifugal force) the gradient wind 'low round a low' (i e a given gap between isobars gradient wind weaker than geostrophic wind) for a given space between isobars (given pressure gradient) you will get least wind speed around a low (cyclonic circulation) at high latitude. Question 141-35
Over which areas can tropical cyclones occur Caribbean sea gulf of bengal indian ocean east of madagascar. no tropical cyclones over lands neither over cold water (such as north atlantic or oriental pacific) cyclone from greek 'kuklo (means 'circle') a generic term all tropical revolving storms according to geographical location terminology differs cylcone in south western northern pacific ocean the south western indian ocean hurricane as derived from huracàn a taino carib god or hunraken mayan storm in northern atlantic ocean the north eastern south western pacific ocean (east of 160e) typhoon from chinese t'ai fung located in in north western pacific ocean caribbean sea gulf of bengal indian ocean east of madagascar the only valid answer. Question 141-36
The hurricane season in caribbean mainly from Caribbean sea gulf of bengal indian ocean east of madagascar. map showing areas affected hurricanes in caribbean area in summer autumn (the atlantic hurricane season runs from june 1st to november 30th the atlantic basin includes atlantic ocean caribbean sea gulf of mexico). Question 141-37
Which statement about hurricanes in north atlantic correct Their eye can be well observed weather satellites. map showing areas affected hurricanes in caribbean area in summer autumn (the atlantic hurricane season runs from june 1st to november 30th the atlantic basin includes atlantic ocean caribbean sea gulf of mexico). Question 141-38
You are flying at fl 340 250 hpa on northern hemisphere the wind geostrophic and there a cross wind from right all time your true altitude will Their eye can be well observed weather satellites. we have a geostrophic wind when pressure gradient force (pgf) exactly balanced coriolis force it only happens when isobars are straights parallels with a cross wind from right there must be low pressure behind high pressure ahead you true altitude will increase (air mass warmer). Question 141-39
You are flying in northern hemisphere at 2000 ft over a flat country area an anticyclone ahead of you and a depression behind you the wind affecting you will be Their eye can be well observed weather satellites. if you stand with your back to wind in northern hemisphere low pressure on your left high pressure on your right (buys ballot's law) if you face high pressure wind affecting you will be from your right. Question 141-40
Why do tropical revolving storms tend to develop mostly in western parts of tropical oceans Because there a maximum of humidity as a result of trade winds long sea passage. if you stand with your back to wind in northern hemisphere low pressure on your left high pressure on your right (buys ballot's law) if you face high pressure wind affecting you will be from your right.
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