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Question 154-1 : What will be the effect on the reading of an altimeter of an aircraft parked on the ground during the period following the passage of an active cold front ? [ Learning aircraft ]

It will have decreased

Admin .if for example your altimeter was set to 1020 hpa and indication was 500 ft after the passage of the cold front the pressure will increase your altimeter remained at 1020 hpa now shows less than 500 ft exemple 254 It will have decreased.

Question 154-2 : What will be the effect on the reading of an altimeter of an aircraft parked on the ground shortly before an active cold front passes ?

It will be increasing

Admin .take an example .parked on the ground your altimeter subscale setting is 1020 hpa and indicated altitude is 0 ft .shortly before the active cold front passes the pressure will begin to fall .for your altimeter it is similar as a gain of alitude .you will see an altitude increase . 518 exemple 258 It will be increasing.

Question 154-3 : What will be the effect on the reading of an altimeter of an aircraft parked on the ground as an active cold front is passing ?

It will first increase then decrease

Admin .as the active cold front is passing the pressure will reduced thus the altimeter will show an increase in altitude .after the cold front surface pressure increases thus the reading of the altimeter will show a decrease exemple 262 It will first increase then decrease.

Question 154-4 : Which of the following best describes zone a . 299 ?

Trough of low pressure

Admin . 546 exemple 266 Trough of low pressure.

Question 154-5 : Which of the following best describes zone b . 299 ?

Col

. 546 exemple 270 Col.

Question 154-6 : Which of the following best describes zone c . 299 ?

Ridge of high pressure

Admin . 546 exemple 274 Ridge of high pressure.

Question 154-7 : Which of the following best describes zone d . 299 ?

Depression

Admin . 546 exemple 278 Depression.

Question 154-8 : At which airport is 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 ?

Einn

Admin .the taf starts at 1300z with surface wind from south west 14 kt gusting 32 kt and heavy thunderstorm and rain typical of cold front conditions .the change between 1400z and 1600z indicates the passage of the cold front and cold sector polar maritime conditions good visibility cumulus cloud and the odd shower .the chart shows the situation at 1500z and it has just gone through einn that's looking about right the stations in switzerland lszh zurich airport and sweden essa stockholm airport are well clear of any frontal activity so it can't be any of them .at 1300z the fronts would be to the west of the scandinavian stations and from the alignment of the isobars we would expect the surface wind to be southerly furthermore the 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 and possible stratus we are left with engm and the surface wind directions in the taf don't tie in with the isobars exemple 282 Einn

Question 154-9 : Which of the following weather conditions would be expected at athens airport lgat at around 1450 utc . 302 ?

21002kt 6000 br sct040 29/16 q1026 nosig =

Admin .isobars are well spaced it means no or low wind this gives us two possible options .in may at athens in the afternoon temperature might easily rise up to more than 25°c we have anticyclonic conditions with stable air moderate visibility and heating will raise the cloud base and dissipate some of the cloud exemple 286 21002kt 6000 br sct040 29/16 q1026 nosig =

Question 154-10 : 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 ?

Taf lsgg 040716 23016kt 8000 ra bkn030 ovc070 becmg 0810 5000 ra bkn020 ovc050 tempo 3000 +ra bkn010 ovc030 becmg 1215 25014kt 8000 sct030 bkn090 =

Admin .a warm front is approaching . 505.as the front is approaching the cloud base gets lower bkn030 ovc070 > bkn020 ovc050 > bkn010 ovc030 the visibility decreases 8000m > 5000m > 3000m and the rain increases ra ra +ra .after the warm front the wind turns slightly following the direction of the warm sector isobars visibility increases and the cloud breaks up exemple 290 Taf lsgg 040716 23016kt 8000 -ra bkn030 ovc070 becmg 0810 5000 ra bkn020 ovc050 tempo 3000 +ra bkn010 ovc030 becmg 1215 25014kt 8000 sct030 bkn090 =

Question 154-11 : 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 =.160850z 25006kt 8000 sct040 sct100 19/15 q1009 nosig. ?

A warm front passed the station early in the morning and a cold front during late afternoon

exemple 294 A warm front passed the station early in the morning and a cold front during late afternoon

Question 154-12 : On an aerodrome when a warm front is approaching ?

Qfe and qnh decrease

Admin .when a warm front is approaching the surface pressure decreases .if the qfe was 1000 hpa and qnh 1020 hpa they will become qfe 990 hpa and qnh 1010 hpa for example your altimeter will show an increase of the indicated altitude .after the warm front in the warm sector surface pressure will remain unchanged and when the cold front will be there surface pressure increase your altimeter will show a decrease of the indicated altitude exemple 298 Qfe and qnh decrease.

Question 154-13 : An observer on the northern hemisphere is under influence of the wind system of a depression which is moving from west to east the centre of the depression passes to the south of the observer .for this observer the wind direction is ?

Continuously backing

Admin .we are in the northern hemisphere around the depression low wind turns counterclockwise .the observer is north of the depression he sees the wind coming from the south to go north by passing east .the centre of the depression passes to the south of his position he sees the wind coming from east going to west by passing north for him the wind direction is continuously backing . 627 exemple 302 Continuously backing.

Question 154-14 : In a warm front occlusion ?

The warm air is lifted

Admin .with a warm occlusion cold front rides up and over the warm front the warm air is lifted . 512 exemple 306 The warm air is lifted.

Question 154-15 : An air mass is unstable when ?

An ascending parcel of air continues to rise to a considerable height

exemple 310 An ascending parcel of air continues to rise to a considerable height.

Question 154-16 : An air mass is stable when ?

Lifted air returns to its original level

exemple 314 Lifted air returns to its original level.

Question 154-17 : The weather most likely to be experienced at position 'r' is . 326 ?

Fine and warm at first ac castellanus and cb in late afternoon with thunderstorms

Admin .it's summer time over england few isobars and we are between low and high pressure .not much wind we do not expect any front over our position for the next hours most probably weather will be convective activity nice for the gliders this could produces ac castellanus and cb in late afternoon with thunderstorms exemple 318 Fine and warm at first, ac castellanus and cb in late afternoon with thunderstorms.

Question 154-18 : An occlusion has the characteristics of a warm front when ?

The cold air behind is warmer than the cold air ahead

Admin .you have cool air behind and cold air ahead . 512.with a warm occlusion cold front rides up and over the warm front the warm air is lifted exemple 322 The cold air behind is warmer than the cold air ahead.

Question 154-19 : An unstable air mass will normally be characterised by ?

Cumuliform cloud and good visibility except in precipitation

exemple 326 Cumuliform cloud and good visibility except in precipitation

Question 154-20 : Cold air pools ?

Are most evident in the temperature and wind fields of the upper levels

Admin .a cold pool is a meteorologic term for a cold air block it is an area with light or no wind low temperature it is a place of instability and convective activity .a cold air pool can be best identified by means of the isohypses on an upper air chart .isohypses contour lines are drawn on a constant pressure chart therefore they indicate the true altitude of a pressure level on an upper air chart as it includes temperature and wind indications you can easily identify a cold air pool you will have an area with light or no wind low temperature exemple 330 Are most evident in the temperature and wind fields of the upper levels.

Question 154-21 : Considering the north atlantic between 30°n and 65°n the mean position of the polar front during winter extends from ?

Florida to sw england

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 334 Florida to sw england.

Question 154-22 : Considering the north atlantic region between 30°n and 65°n the mean position of the polar front during summer extends from ?

Newfoundland to n scotland

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 338 Newfoundland to n scotland.

Question 154-23 : For an airfield located in the british isles the passage of a warm front will usually be indicated by ?

Rise in temperature rise in dew point temperature wind veers and decreases

Admin . 567.ahead of a warm front in northern hemisphere as ahead of a cold front the wind veers in the friction layer and veers above the friction layer .on the passage of a warm front the temperature and dew point will rise the wind will veer and decrease there will not be a rapid improvement in visibility or a rapid fall in pressure exemple 342 Rise in temperature, rise in dew point temperature, wind veers and decreases.

Question 154-24 : In the weather pattern behind a cold front the visibility outside precipitation is ?

Good and the precipitation is showers

Admin . 614.in the weather pattern behind a cold front the visibility outside precipitation is good and the precipitation is showers exemple 346 Good and the precipitation is showers.

Question 154-25 : The passage of a warm front can be associated with areas of fog the types of fog just in advance and just after the passage are respectively ?

Frontal fog and advection fog

Admin .radiation fog forms due to surface cooling at night in a light wind .steaming fog is the same as arctic smoke or sea smoke and is caused by cold air moving over a warm surface .advection fog forms when warm humid air flows over a cold surface .frontal fog is most likely to occur in advance of a warm front it is due to the rain falls from the warm air into the cold air exemple 350 Frontal fog and advection fog.

Question 154-26 : The pressure system indicated when in a vertical cross section the lower situated pressure surfaces bulge upward and the higher situated pressure surfaces bulge downward is a ?

Cold high pressure area

Admin .you have a high pressure at the surface and low temperatures in the air . 604 exemple 354 Cold high pressure area.

Question 154-27 : The lowest cloud type observed is stratus fractus and there is moderate continuous rain the area of the system in which you are at this moment is ?

The main body of the warm or cold front or of the occlusion

Admin . 622. 605 exemple 358 The main body of the warm or cold front, or of the occlusion.

Question 154-28 : What is signified if an occlusion is described as 'cold' ?

The air ahead of the associated warm front is less cold than the air behind the associated cold front

Admin . 537.cold front 'lifts' the warm front up and over the very cold air exemple 362 The air ahead of the associated warm front is less cold than the air behind the associated cold front.

Question 154-29 : When a front has to cross a chain of mountains its activity ?

Strengthens 'upwind' of the mountains

exemple 366 Strengthens 'upwind' of the mountains.

Question 154-30 : When flying at 5000 ft in the northern hemisphere over plains with an anticyclone on the left and a depression on the right the wind will be ?

A head wind

Admin .if you stand with your back to the wind in the northern hemisphere low pressure is on your left buys ballot's law . 606.it means that an anticyclone is on your right and a depression is on your left .but if you turn yourself to have the anticyclone on your left and the depression on your right the wind will be a head wind . 607 exemple 370 A head wind.

Question 154-31 : What type of weather can usually be expected in a polar maritime air mass over central europe in the daytime during summer ?

Showers and good visibility

Admin .a polar maritime air mass originates over the northern part of the north atlantic ocean it is unstable cool and moist air and can produce anything from cumulus to cumulonimbus with showers and sunny spells in between . 611 exemple 374 Showers and good visibility.

Question 154-32 : Which statement is correct for a warm occlusion ?

The cold front becomes a front aloft

Admin . 628.with a warm occlusion the warmer of the cold air masses is doing the pushing from the back so it cannot 'burrow' under the colder air ahead and so it 'slides' up the warm front surface exemple 378 The cold front becomes a front aloft.

Question 154-33 : The air mass in the warm sector of a polar front is ?

Tropical air

Admin .the polar front is the boundary between polar air and tropical air . 481.warm sector is tropical air mass .air behind the polar front is cold this is the polar air mass exemple 382 Tropical air.

Question 154-34 : Which two air masses are most likely to govern weather in western europe ?

Maritime tropical warm and maritime polar cold

exemple 386 Maritime tropical warm and maritime polar cold.

Question 154-35 : The air masses that are observed most frequently over western europe are ?

Polar air and tropical air

exemple 390 Polar air and tropical air.

Question 154-36 : Which type of air mass never occurs over central europe ?

Equatorial air

exemple 394 Equatorial air.

Question 154-37 : The weather most likely to be experienced at position 'b' is . 327 ?

Frequent showers of rain or snow

Admin .a cold front has passed over position 'b' few hours ago we are in the cold sector behind the cold front . 614.in the weather pattern behind a cold front the visibility outside precipitation is good and the precipitation is showers in march rain or snow exemple 398 Frequent showers of rain or snow.

Question 154-38 : During summer the cloud type most applicable to square 2a is . 328 ?

Cb

exemple 402 Cb

Question 154-39 : The cloud type most applicable to square 2b is . 332 ?

Cb

Admin .square 2b is from fl70 to fl180 in this square you can not find any cirrostratus cs high level or stratus and stratoscumulus st and sc low level it remains cb and the cb would be just ahead of the cold front .the magic drawing . 622.each question asking for weather in square 2b have four different possible answers .in square 2b you can be in the cb or above the stratus in square 3b in clear and stable conditions .you will not have a question with the two answers available exemple 406 Cb.

Question 154-40 : The cloud type most applicable to square 2c is . 332 ?

As

exemple 410 As


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