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What type of front / occlusion usually moves the fastest ? [ Certification weather ]

Question 140-1 : Cold front warm front cold occlusion warm occlusion

exemple 240 Cold front. — Admin . 621 Cold front.

What weather conditions are prevalent during the summer over the north sea ?

Question 140-2 : Cloud cover mostly scattered isolated showers advection fog rain covering a large area 8 octas ns 8 octas cs as without precipitation

exemple 244 Cloud cover mostly scattered, isolated showers. — Cloud cover mostly scattered, isolated showers.

What is the surface visibility most likely to be in a warm sector of maritime ?

Question 140-3 : Moderate several km very poor less than 1 km good greater than 10 km very good greater than 50 km

exemple 248 Moderate (several km). — Admin .the warm sector is invariably tropical maritime air mass warm moist and stable .visibility is generally not good but on a warm summer afternoon the air becomes less stable the relative humidity decreases and visibility improves Moderate (several km).

After passing at right angles through a very active cold front in the direction ?

Question 140-4 : A veering in the wind direction a backing in the wind direction an increase in tailwind a decrease in tailwind

exemple 252 A veering in the wind direction. — Admin .in the northern hemisphere the air flows anti clockwise around a depression . 509.if you are flying through the cold front from the warm sector to the cold sector at right angles the wind which was previously from the left of your nose becomes from the right of your nose that means the wind direction has increased in heading so that is veering A veering in the wind direction.

Which one of the tracks dashed lines is represented by the cross section shown ?

Question 140-5 : Track d a track c a track b a track b c

exemple 256 Track d-a — Admin .track d a corresponds to a warm occlusion . 628.with a warm occlusion cold front rides up and over the warm front .if the line of the occlusion is approximately along the same line as the warm front then we have a warm occlusion . 512 Track d-a

Which cross section of air mass and cloud presentation is applicable to the ?

Question 140-6 : N°3 n°1 n°2 n°4

exemple 260 N°3 — Admin .n°1 cold front and n°4 warm front are out line a b is an occlusion .n°3 is a warm occlusion and n°2 a cold occlusion .cold front rides up and over the warm front . 512.if the line of the occlusion was approximately along the same line as the warm front then we have a warm occlusion n°3 N°3

Refer to the diagram assuming the usual direction of movement where will this ?

Question 140-7 : Position 3 position 2 position 1 position 4

exemple 264 Position 3. — Admin . 508.the isobars in the warm sector tend to be parallel and straight and give an indication in the direction of the system until it occludes Position 3.

What is the classification of the airmass affecting position 'q' at 0600 utc . ?

Question 140-8 : Tropical maritime polar continental polar maritime tropical continental

exemple 268 Tropical maritime. — Admin . 455 Tropical maritime.

In which of the following regions does maritime polar air originate ?

Question 140-9 : East of greenland region of british isles baltic sea black sea

exemple 272 East of greenland. — Admin .a polar maritime air mass originates over the northern part of the north atlantic ocean east of greenland it is unstable cool and moist air and can produce anything from cumulus to cumulonimbus with showers and sunny spells in between . 611 East of greenland.

In which of the following situations can freezing rain be encountered ?

Question 140-10 : Ahead of a warm front in the winter ahead of a cold front in the winter behind a warm front in the summer ahead of a cold front in the summer

exemple 276 Ahead of a warm front in the winter. — Admin . 505.freezing rain is encountered ahead of a warm front in winter and in summer and sometimes behind a cold front Ahead of a warm front in the winter.

How do air masses move at a warm front ?

Question 140-11 : Warm air overrides a cold air mass cold air overrides a warm air mass cold air undercuts a warm air mass warm air undercuts a cold air mass

exemple 280 Warm air overrides a cold air mass. — Admin . 505.in a warm front warm air overrides a cold air mass Warm air overrides a cold air mass.

What type of precipitation would you expect at an active unstable cold front ?

Question 140-12 : Showers associated with thunderstorms freezing rain light to moderate continuous rain drizzle

exemple 284 Showers associated with thunderstorms. — Admin . 614.an air mass is unstable when an ascending parcel of air continues to rise to a considerable height eg cb .an unstable air mass will normally be characterised by cumuliform cloud and good visibility except in precipitation Showers associated with thunderstorms.

What is the relative movement of the two air masses along a cold front ?

Question 140-13 : Cold air pushes under a warm air mass warm air pushes over a cold air mass cold air slides over a warm air mass warm air pushes under a cold air mass

exemple 288 Cold air pushes under a warm air mass. — Admin . 621.along a cold front the cold air pushes the warm air up Cold air pushes under a warm air mass.

What cloud cover is typical for a wide warm sector of a polar front depression ?

Question 140-14 : Fair weather cu bkn cu and cb sky clear st with drizzle

exemple 292 Fair weather cu. — Admin .in a wide warm sector in summer over land you will have fair weather cumulus in winter you will have stratus mist and drizzle . 516 Fair weather cu.

Which of the following describes a warm occlusion ?

Question 140-15 : The coldest air mass is ahead of the original warm front the air mass behind the front is more unstable than the air mass ahead of the front the air mass ahead of the front is drier than the air mass behind the front the warmer air mass is ahead of the original warm front

exemple 296 The coldest air mass is ahead of the original warm front. — Admin .with a warm occlusion cold front rides up and over the warm front . 639. 626.in a warm occlusion the wedge of warm air from a warm sector depression is pushed up by the fast moving cold front and carried along aloft as the depression moves The coldest air mass is ahead of the original warm front.

When do cold occlusions occur most frequently in europe ?

Question 140-16 : Summer winter autumn and winter winter and spring

exemple 300 Summer. — Admin .over europe we get more warm occlusions in the winter and more cold occlusions in the summer Summer.

In which main direction does a polar front depression move ?

Question 140-17 : Along the front towards the east along the front towards the west across the front towards the north across the front towards the south

exemple 304 Along the front towards the east. — Admin .depressions affecting western europe develop over the atlantic where cold polar air meets warm tropical air then moves east steered by the strong winds aloft this boundary is known as the polar front as show in this picture . 517 Along the front towards the east.

What change in pressure will occur at point a during the next hour . 263 ?

Question 140-18 : A rise in pressure a drop in pressure irregular fluctuations approximately constant pressure

exemple 308 A rise in pressure. — Admin . 518.as the cold front moves away the barometer starts rising A rise in pressure.

What is the most likely cause of a lack of clouds at higher levels in a ?

Question 140-19 : Sinking air rising air instability divergence at higher levels

exemple 312 Sinking air. — Admin . 500.with convergence aloft and divergence at the surface sinking air will dissipate cloud Sinking air.

The front labelled 'z' is a . 279 ?

Question 140-20 : Warm front cold front cold occlusion warm occlusion

exemple 316 Warm front. — Warm front.

What is the speed of the front located over france . 284 ?

Question 140-21 : 15 kt 25 kt 10 kt 30 kt

exemple 320 15 kt — Admin . 645 15 kt

How are the air masses distributed in a cold occlusion ?

Question 140-22 : The coldest air mass behind and the less cold air in front of the occlusion the warm air mass is above ground level the coldest air in front of and the less cold air is behind the occlusion the warm air mass is above ground level the coldest air in front of and the warm air behind the occlusion the less cold air is above ground level the coldest air behind and the warm air in front of the occlusion the less cold air mass is above ground level

exemple 324 The coldest air mass behind and the less cold air in front of the occlusion, the warm air mass is above ground level. — Admin . 537.cold front 'lifts' the warm front up and over the very cold air The coldest air mass behind and the less cold air in front of the occlusion, the warm air mass is above ground level.

What characterizes a stationary front ?

Question 140-23 : The surface wind usually has its direction parallel to the front the surface wind usually has its direction perpendicular to the front the warm air moves at approximately half the speed of the cold air the weather conditions that it originates is a combination between those of an intense cold front and those of a warm and very active front

exemple 328 The surface wind usually has its direction parallel to the front. — Admin .a stationary front forms when a cold front or warm front stops moving this happens when two masses of air are pushing against each other but neither is powerful enough to move the other winds blowing parallel to the front instead of perpendicular can help it stay in place . 538.a stationary front may stay put for days if the wind direction changes the front will start moving again becoming either a cold or warm front or the front may break apart .the weather is often cloudy along a stationary front and rain or snow often falls especially if the front is in an area of low atmospheric pressure .on a weather map a stationary front is shown as alternating red semicircles and blue triangles the blue triangles point in one direction and the red semicircles point in the opposite direction The surface wind usually has its direction parallel to the front.

In an intense trough of low pressure over iceland during wintertime the weather ?

Question 140-24 : Strong wind shear convection and snow showers strong wind associated with an almost clear sky strong wind with subsidence at low levels light wind good visibility and a high cloud ceiling

exemple 332 Strong wind shear, convection and snow showers. — Admin .with a trough of low pressure over iceland and due to the coriolis effect a consequence of the earth's rotation this in turn gives rise to a strong flow of cold air from greenland which imply below normal temperatures in western greenland and over iceland the weather likely to be experienced is strong wind shear convection and snow showers in winter Strong wind shear, convection and snow showers.

Where are you likely to find the strongest winds close to the ground ?

Question 140-25 : In the transition zone between two air masses at the centre of a low pressure system at the centre of a high pressure system where there is little variation in pressure over a large area during the winter months

exemple 336 In the transition zone between two air masses. — Admin .at the centre of a low pressure system a low or at the centre of a high pressure system a high and over area where there is little pressure gradient little variation in pressure over a large area winds are very light .on the other hand in the transition zone between two air masses at a warm front or a cold front you will find the strong winds close to the ground In the transition zone between two air masses.

An aircraft flying in the southern hemisphere at 2000 feet has to turn to the ?

Question 140-26 : In front behind to the left to the right

exemple 340 In front. — Admin .if you need to turn right to counteract the wind because you are drifting left the wind is coming from your right .if you stand with your back to the wind in the northern hemisphere low pressure is on your left buys ballot's law . northern hemisphere . 542.so in the southern hemisphere if you stand with your back to the wind low pressure is on the right .the wind is coming from your right so the centre of low pressure is in front of the aircraft In front.

Between which latitudes are you most likely to find the subtropical high ?

Question 140-27 : 25° 35° 10° 15° 35° 55° 55° 75°

exemple 344 25° - 35°. — Admin . 584 25° - 35°.

'after such a fine day the ring around the moon was a bad sign terday evening ?

Question 140-28 : A warm front a blizzard weather at the back of a cold front a cold front

exemple 348 A warm front. — Admin . 622.the ring around the moon halo is caused by the cirrus of the warm front A warm front.

What will be the effect on the reading of an altimeter of an aircraft parked on ?

Question 140-29 : It will have decreased it will remain unchanged it will have increased it will show a small increase or decrease

exemple 352 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 It will have decreased.

What will be the effect on the reading of an altimeter of an aircraft parked on ?

Question 140-30 : It will be increasing it will remain unchanged it will be decreasing it will fluctuate up and down by about +/ 50 feet

exemple 356 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 It will be increasing.

What will be the effect on the reading of an altimeter of an aircraft parked on ?

Question 140-31 : It will first increase then decrease it will remain unchanged it will first decrease then increase it will fluctuate up and down by about +/ 50 feet

exemple 360 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 It will first increase then decrease.

Which of the following best describes zone a . 299 ?

Question 140-32 : Trough of low pressure col ridge of high pressure depression

exemple 364 Trough of low pressure. — Admin . 546 Trough of low pressure.

Which of the following best describes zone b . 299 ?

Question 140-33 : Col ridge of high pressure depression trough of low pressure

exemple 368 Col. — . 546 Col.

Which of the following best describes zone c . 299 ?

Question 140-34 : Ridge of high pressure col trough of low pressure depression

exemple 372 Ridge of high pressure. — Admin . 546 Ridge of high pressure.

Which of the following best describes zone d . 299 ?

Question 140-35 : Depression ridge of high pressure anticyclone trough of low pressure

exemple 376 Depression. — Admin . 546 Depression.

At which airport is the following weather development taking place .taf 231200z ?

Question 140-36 : Einn essa lszh ekch

exemple 380 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 Einn

Which of the following weather conditions would be expected at athens airport ?

Question 140-37 : 21002kt 6000 br sct040 29/16 q1026 nosig = 26014kt 8000 bkn090 17/12 q1009 becmg 4000 = 23018g35kt 9999 sct035 10/04 q0988 nosig = 16002kt 0200 r33l/0600n fg vv001 12/12 q1031 becmg 0800 =

exemple 384 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 21002kt 6000 br sct040 29/16 q1026 nosig =

This chart shows the weather conditions on the ground at 0600 utc on may 4 ?

Question 140-38 : 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 = taf lsgg 040716 vrb03kt 6000 br sct020 becmg 0811 23005kt 9999 sct025tcu prob 40 tempo 1216 34012g30kt 3000 tsra bkn020cb = taf lsgg 040716 05014kt 5000 ovc015 becmg 0810 8000 bkn018 becmg 1013 05015g30kt 9999 sct025 = taf lsgg 040716 26012kt 9999 sct030 bkn080 tempo 1013 25020g35kt 3000 tsra or +shra bkn030cb becmg 1316 vrb02kt 3000 bcfg sct100 =

exemple 388 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 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 =

In zurich during a summer day the following weather observations were taken ?

Question 140-39 : A warm front passed the station early in the morning and a cold front during late afternoon a cold front passed the station early in the morning and a warm front during late afternoon a trough line passed the station early in the morning and a warm front during late afternoon storm clouds due to warm air came close to and grazed the station

exemple 392 A warm front passed the station early in the morning and a cold front during late afternoon — A warm front passed the station early in the morning and a cold front during late afternoon

On an aerodrome when a warm front is approaching ?

Question 140-40 : Qfe and qnh decrease qfe and qnh increase qfe increases and qnh decreases qfe decreases and qnh increases

exemple 396 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 Qfe and qnh decrease.

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