Which of the following best describes Zone A 299 ?
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Which of the following best describes Zone B 546 ?
Which of the following best describes Zone C 299 ?
Which of following best describes zone d 299 Ridge of high pressure. . 
At which airport the following weather development taking place taf 231200z 231322 24014g32kt 4000 +tsra sct005 bkn015 bkn020cb becmg 1416 29012kt 9999 bkn030tcu sct100 tempo 1619 8000 shra bkn025tcu becmg 1922 27012kt 9999 sct030 ovc220 = 302 Ridge of high pressure. the taf starts at 1300z with surface wind from south west 14 kt gusting 32 kt heavy thunderstorm rain typical of cold front conditions the change between 1400z 1600z indicates passage of cold front cold sector (polar maritime) conditions good visibility cumulus cloud the odd shower the chart shows situation at 1500z it has just gone through einn that's looking about right the stations in switzerland (lszh zurich airport) sweden (essa stockholm airport) are well clear of any frontal activity so it can't be any of them at 1300z fronts would be to west of scandinavian stations and from alignment of isobars we would expect surface wind to be southerly furthermore fronts won't hit essa until some time after 1500z so we can rule that one out ekch will go into warm sector conditions (tropical maritime poor visibility possible stratus) we are left with engm the surface wind directions in taf don't tie in with isobars. 
Which of following weather conditions would be expected at athens airport lgat at around 1450 utc 302 2 2kt 6 br sct 4 29/ 6 q 26 nosig =. isobars are well spaced it means no or low wind this gives us two possible options in may at athens in afternoon temperature might easily rise up to more than 25°c we have anticyclonic conditions with stable air moderate visibility heating will raise cloud base dissipate some of cloud. 
This chart shows weather conditions on ground at 0600 utc on may 4 which of following reports reflects weather development at geneva airport 314 Taf lsgg 4 7 6 23 6kt 8 ra bkn 3 ovc 7 becmg 8 5 ra bkn 2 ovc 5 tempo 3 +ra bkn ovc 3 becmg 2 5 25 4kt 8 sct 3 bkn 9 =. a warm front approaching as front approaching cloud base gets lower (bkn030 ovc070 > bkn020 ovc050 > bkn010 ovc030) visibility decreases (8000m > 5000m > 3000m) the rain increases ( ra ra +ra) after warm front wind turns slightly (following direction of warm sector isobars) visibility increases the cloud breaks up. Question 138-8
In zurich during a summer day following weather observations were taken 160450z 23015kt 3000 +ra sct008 sct020 ovc030 13/12 q1010 nosig =160650z 25008kt 6000 sct040 bkn090 18/14 q1010 rera nosig =160850z 25006kt 8000 sct040 sct100 19/15 q1009 nosig161050z 24008kt 9999 sct040 sct100 21/15 q1008 nosig =161250z 23012kt cavok 23/16 q1005 nosig =161450z 23016kt 9999 sct040 bkn090 24/17 q1003 becmg 25020g40kt ts =161650z 24018g35kt 3000 +tsra sct006 bkn015cb 18/16 q1002 nosig =161850z 28012kt 9999 sct030 sct100 13/11 q1005 nosig =what do you conclude based on these observations A warm front passed station early in morning a cold front during late afternoon. a warm front approaching as front approaching cloud base gets lower (bkn030 ovc070 > bkn020 ovc050 > bkn010 ovc030) visibility decreases (8000m > 5000m > 3000m) the rain increases ( ra ra +ra) after warm front wind turns slightly (following direction of warm sector isobars) visibility increases the cloud breaks up. Question 138-9
On an aerodrome when a warm front approaching A warm front passed station early in morning a cold front during late afternoon. when a warm front approaching surface pressure decreases if qfe was 1000 hpa qnh 1020 hpa they will become qfe 990 hpa qnh 1010 hpa example your altimeter will show an increase of indicated altitude after warm front in warm sector surface pressure will remain unchanged when cold front will be there surface pressure increase your altimeter will show a decrease of indicated altitude. Question 138-10
An observer on northern hemisphere under influence of wind system of a depression which moving from west to east the centre of depression passes to south of observer for this observer wind direction Continuously backing. we are in northern hemisphere around depression (low) wind turns counterclockwise the observer north of depression he sees wind coming from south to go north passing east the centre of depression passes to south of his position he sees wind coming from east going to west passing north for him wind direction continuously backing . Question 138-11
In a warm front occlusion Continuously backing. with a warm occlusion cold front rides up over warm front warm air lifted . Question 138-12
An air mass unstable when An ascending parcel of air continues to rise to a considerable height. with a warm occlusion cold front rides up over warm front warm air lifted . Question 138-13
An air mass stable when Lifted air returns to its original level. with a warm occlusion cold front rides up over warm front warm air lifted . Question 138-14
The weather most likely to be experienced at position 'r' 326 Fine warm at first ac castellanus cb in late afternoon with thunderstorms. it's summer time over england few isobars we are between low high pressure not much wind we do not expect any front over our position the next hours most probably weather will be convective activity (nice the gliders) this could produces ac castellanus cb in late afternoon with thunderstorms. Question 138-15
An occlusion has characteristics of a warm front when The cold air behind warmer than cold air ahead. you have cool air behind cold air ahead with a warm occlusion cold front rides up over warm front the warm air lifted. Question 138-16
An unstable air mass will normally be characterised Cumuliform cloud good visibility except in precipitation. you have cool air behind cold air ahead with a warm occlusion cold front rides up over warm front the warm air lifted. Question 138-17
Cold air pools Are most evident in temperature wind fields of upper levels. a cold pool a meteorologic term a cold air block it an area with light or no wind low temperature it a place of instability convective activity a cold air pool can be best identified means of isohypses on an upper air chart isohypses (contour lines) are drawn on a constant pressure chart therefore they indicate true altitude of a pressure level on an upper air chart as it includes temperature wind indications you can easily identify a cold air pool (you will have an area with light or no wind low temperature). Question 138-18
Considering north atlantic between 30°n and 65°n mean position of polar front during winter extends from Florida to sw england. 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 138-19
Considering north atlantic region between 30°n and 65°n mean position of polar front during summer extends from Newfoundland to n scotland. 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 138-20
For an airfield located in british isles passage of a warm front will usually be indicated Rise in temperature rise in dew point temperature wind veers decreases. ahead of a warm front in northern hemisphere as ahead of a cold front wind veers in friction layer veers above friction layer on passage of a warm front temperature dew point will rise wind will veer decrease there will not be a rapid improvement in visibility or a rapid fall in pressure. Question 138-21
In weather pattern behind a cold front visibility outside precipitation Good the precipitation showers. in weather pattern behind a cold front visibility outside precipitation good the precipitation showers. Question 138-22
The passage of a warm front can be associated with areas of fog the types of fog just in advance and just after passage are respectively Frontal fog advection fog. radiation fog forms due to surface cooling at night in a light wind steaming fog the same as arctic smoke or sea smoke is caused cold air moving over a warm surface advection fog forms when warm humid air flows over a cold surface frontal fog most likely to occur in advance of a warm front it due to rain falls from warm air into cold air. Question 138-23
The pressure system indicated when in a vertical cross section lower situated pressure surfaces bulge upward and higher situated pressure surfaces bulge downward a Cold high pressure area. you have a high pressure at surface low temperatures in air . Question 138-24
The lowest cloud type observed stratus fractus and there moderate continuous rain the area of system in which you are at this moment The main body of warm or cold front or of occlusion. . Question 138-25
What signified if an occlusion described as 'col The air ahead of associated warm front less cold than air behind associated cold front. cold front 'lift warm front up over very cold air. Question 138-26
When a front has to cross a chain of mountains its activity Strengthens 'upwin of mountains. cold front 'lift warm front up over very cold air. Question 138-27
When flying at 5000 ft in northern hemisphere over plains with an anticyclone on left and a depression on right wind will be Strengthens 'upwin of mountains. if you stand with your back to wind in northern hemisphere low pressure on your left (buys ballot's law) it means that an anticyclone on your right a depression on your left but if you turn yourself to have anticyclone on your left the depression on your right wind will be a head wind . Question 138-28
What type of weather can usually be expected in a polar maritime air mass over central europe in daytime during summer Showers good visibility. a polar maritime air mass originates over northern part of north atlantic ocean it unstable (cool moist air) can produce anything from cumulus to cumulonimbus with showers sunny spells in between . Question 138-29
Which statement correct a warm occlusion The cold front becomes a front aloft. with a warm occlusion warmer of cold air masses doing pushing from back so it cannot 'burrow' under colder air ahead so it 'slide up warm front surface. Question 138-30
The air mass in warm sector of a polar front The cold front becomes a front aloft. the polar front the boundary between polar air tropical air warm sector tropical air mass air behind polar front cold this the polar air mass. Question 138-31
Which two air masses are most likely to govern weather in western europe Maritime tropical warm maritime polar cold. the polar front the boundary between polar air tropical air warm sector tropical air mass air behind polar front cold this the polar air mass. Question 138-32
The air masses that are observed most frequently over western europe are Polar air tropical air. the polar front the boundary between polar air tropical air warm sector tropical air mass air behind polar front cold this the polar air mass. Question 138-33
Which type of air mass never occurs over central europe Polar air tropical air. the polar front the boundary between polar air tropical air warm sector tropical air mass air behind polar front cold this the polar air mass. Question 138-34
The weather most likely to be experienced at position 'b' 327 Frequent showers of rain or snow. a cold front has passed over position 'b' few hours ago we are in cold sector (behind cold front) in weather pattern behind a cold front visibility outside precipitation good the precipitation showers (in march rain or snow). Question 138-35
During summer cloud type most applicable to square 2a 328 Frequent showers of rain or snow. a cold front has passed over position 'b' few hours ago we are in cold sector (behind cold front) in weather pattern behind a cold front visibility outside precipitation good the precipitation showers (in march rain or snow). Question 138-36
The cloud type most applicable to square 2b 332 Frequent showers of rain or snow. square 2b from fl70 to fl180 in this square you can not find any cirrostratus (cs high level) or stratus stratoscumulus (st sc low level) it remains cb the cb would be just ahead of cold front the magic drawing each question asking weather in square 2b have four different possible answers in square 2b you can be in cb or above stratus (in square 3b) in clear stable conditions you will not have a question with two answers available. Question 138-37
The cloud type most applicable to square 2c 332 Frequent showers of rain or snow. square 2b from fl70 to fl180 in this square you can not find any cirrostratus (cs high level) or stratus stratoscumulus (st sc low level) it remains cb the cb would be just ahead of cold front the magic drawing each question asking weather in square 2b have four different possible answers in square 2b you can be in cb or above stratus (in square 3b) in clear stable conditions you will not have a question with two answers available. Question 138-38
The cloud type most applicable to square 1e 332 Frequent showers of rain or snow. square 2b from fl70 to fl180 in this square you can not find any cirrostratus (cs high level) or stratus stratoscumulus (st sc low level) it remains cb the cb would be just ahead of cold front the magic drawing each question asking weather in square 2b have four different possible answers in square 2b you can be in cb or above stratus (in square 3b) in clear stable conditions you will not have a question with two answers available. Question 138-39
The front at bottom of diagram south of position c 333 An occlusion on surface. . Question 138-40
The weather most likely to be experienced at position 'b' 334 Frequent showers of rain or snow good visibility outside showers. a cold front has passed over position 'b' few hours ago we are in cold sector (behind cold front) in weather pattern behind a cold front visibility outside precipitation good the precipitation showers.
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