Which of the following weather conditions would be expected at Athens Airport LGAT at around 1450 UTC 302 ?
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This chart shows the weather conditions on the ground at 0600 UTC on May 4 Which of the following reports reflects weather development at Geneva Airport 314 ?
In Zurich during a summer day the 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 ?
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. 
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 . 
In a warm front occlusion Continuously backing. with a warm occlusion cold front rides up over warm front warm air lifted . 
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 Air Masses and Fronts 140 Answer 8
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 Air Masses and Fronts 140 Answer 9
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 Air Masses and Fronts 140 Answer 10
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 Air Masses and Fronts 140 Answer 11
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 Air Masses and Fronts 140 Answer 12
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 Air Masses and Fronts 140 Answer 13
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 Air Masses and Fronts 140 Answer 14
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 Air Masses and Fronts 140 Answer 15
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 Air Masses and Fronts 140 Answer 16
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 Air Masses and Fronts 140 Answer 17
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 Air Masses and Fronts 140 Answer 18
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 Air Masses and Fronts 140 Answer 19
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 Air Masses and Fronts 140 Answer 20
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 Air Masses and Fronts 140 Answer 21
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 Air Masses and Fronts 140 Answer 22
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 Air Masses and Fronts 140 Answer 23
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 Air Masses and Fronts 140 Answer 24
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 Air Masses and Fronts 140 Answer 25
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 Air Masses and Fronts 140 Answer 26
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 Air Masses and Fronts 140 Answer 27
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 Air Masses and Fronts 140 Answer 28
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 Air Masses and Fronts 140 Answer 29
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 Air Masses and Fronts 140 Answer 30
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 Air Masses and Fronts 140 Answer 31
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 Air Masses and Fronts 140 Answer 32
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 Air Masses and Fronts 140 Answer 33
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 Air Masses and Fronts 140 Answer 34
The front at bottom of diagram south of position c 333 An occlusion on surface. . Question Air Masses and Fronts 140 Answer 35
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. Question Air Masses and Fronts 140 Answer 36
The air mass at position 'x' most likely to be 335 Frequent showers of rain or snow good visibility outside showers. regarding overall mass movement air mass coming from ocean (the isobars in warm sector give an indication in direction of system until it occludes) a large body of air will have characteristics of its origin (the source region) particulary with regard to moisture temperature in that a mass of air can originate from tropical or polar regions (be warm or cold) or be maritime or polar (wet or dry). Question Air Masses and Fronts 140 Answer 37
The weather most likely to be experienced near to position 'a' 336 Frequent showers of rain snow good visibility outside precipitation. a cold front has passed over position 'a' 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. Question Air Masses and Fronts 140 Answer 38
For an aircraft making an approach to an airfield located in square 3b away from vicinity of fronts most likely weather conditions in winter are 337 Poor visibility in mist drizzle. in summer we could expect scattered sc cu with good visibility in winter cloud base would remain low over land we gonna have poor visibility in mist drizzle. Question Air Masses and Fronts 140 Answer 39
For an aircraft making an approach to an airfield located in square 3b most likely weather conditions are 338 Poor visibility in mist drizzle. this the warm sector once warm front passes your location you will notice an increase in temperature air pressure as warm sector moves into your location you will notice an increase in humidity of air. Question Air Masses and Fronts 140 Answer 40
What flight conditions are most likely to be experienced in square 2b an aircraft at fl 120 337 Vmc above layers of st sc generally stable conditions. in middle of warm sector we would expect to experience typical tropical maritime conditions low stratus poor visibility drizzle at surface but at fl120 (without frontal lifting action) aircraft would be in clear stable air above cloud layers the magic drawing each question asking weather in square 2b offer four different possible answers in square 2b you can be in cb or above stratus (located in square 3b) in clear stable conditions you will not have a question with two answers available.
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