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Question 169-1 : The slope and speed of a warm front compared to the slope and speed of a cold front is in general ? [ Formation assignment ]

Smaller and slower.

. 621 exemple 269 Smaller and slower.

Question 169-2 : The air mass affecting position 'a' is most likely to be . 354 ?

Maritime polar.

. 623 exemple 273 Maritime polar.

Question 169-3 : The air mass affecting position 'r' is most likely to be. 358 ?

Maritime polar.

.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.. 623 exemple 277 Maritime polar.

Question 169-4 : The air mass affecting position 'c' is most likely to be. 359 ?

Maritime tropical.

. 623.a large body of air will have the characteristics of its origin the source region , particulary with regard to moisture and 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. exemple 281 Maritime tropical.

Question 169-5 : During the passage of a front in the northern hemisphere the wind veers. this statement is ?

True.

. 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. exemple 285 True.

Question 169-6 : In the northern hemisphere advection of warm air aloft indicates ?

The approach of a warm occlusion.

.with a warm occlusion, cold front rides up and over the warm front.. 626.advection = horizontal movement..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. exemple 289 The approach of a warm occlusion.

Question 169-7 : An air mass is ?

An extensive body of air within which the temperature and humidity in horizontal planes are practically uniform.

exemple 293 An extensive body of air within which the temperature and humidity in horizontal planes are practically uniform.

Question 169-8 : A stationary front is a front in which ?

There is no horizontal motion perpendicular to the front.

exemple 297 There is no horizontal motion perpendicular to the front.

Question 169-9 : An air mass acquires its basic properties ?

By stagnation of the air for a long period of time over areas having particular characteristics

exemple 301 By stagnation of the air for a long period of time over areas having particular characteristics

Question 169-10 : An occlusion is called a warm occlusion when the cold air ?

At the rear of the occlusion is less cold than the cold air ahead, with the warm air at a higher altitude.

.with a warm occlusion, cold front rides up and over the warm front. we have cool air behind, and cold air ahead. 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. exemple 305 At the rear of the occlusion is less cold than the cold air ahead, with the warm air at a higher altitude.

Question 169-11 : At a cold front ?

Warm air is lifted as cooler air pushes under it.

. 621.at a cold front, the cold air pushes the warm air up warm air is lifted. exemple 309 Warm air is lifted as cooler air pushes under it.

Question 169-12 : At a station at the surface the significant weather with a warm front will come ?

Mostly before the front passes.

. 505.the question is asking about what happens at the surface only..the active weather low cloud and continuous rain is ahead of the surface position of the front and the frontal rain stops when the front passes through the surface position. exemple 313 Mostly before the front passes.

Question 169-13 : The diagram of the system represents a. 362 ?

Warm occlusion.

.if the warm frontal surface contacts the ground, it's a warm occlusion.. 628 exemple 317 Warm occlusion.

Question 169-14 : The warm sector is indicated by number. 364 ?

3.

exemple 321 3.

Question 169-15 : A convergence line is indicated by number. 364 ?

1.

exemple 325 1.

Question 169-16 : In which air mass are extremely low temperatures encountered ?

Continental polar air.

.the lowest temperature is found within the continental polar region because russia where the continental polar region is located is far way from any sea and ocean, for this reason it is very cold and dry. exemple 329 Continental polar air.

Question 169-17 : At lyon lfly, n4545 e00500 , at 1200 utc, the sky is overcast with stratocumulus and altostratus and it is raining..using the swc in appendix, valid at 1200 utc, we can estimate a weather improvement for lyon.. 369 ?

2100 utc.

A cold front is currently over lfly, travelling at 10 kt as indicated by the arrow and '10'. we have to wait for the aera behind this front to have a weather improvement..it will take between 6h to 10 hours, the answer '2100 utc' sounds perfect. exemple 333 2100 utc.

Question 169-18 : The following sequence of clouds is observed at an airport cirrus, cirrostratus, altostratus, nimbostratus. this is typical for ?

The passage of a warm front.

Img505 exemple 337 The passage of a warm front.

Question 169-19 : The average slope of a cold front is in the order of ?

Of 1 80.

exemple 341 Of 1:80.

Question 169-20 : The average position of the polar front in the northern hemisphere is ?

More southerly during the winter than during the summer.

The polar front is the boundary between polar air and tropical air...during the winter months in the northern hemisphere , the polar front pushes farther southward, because of the greater density of the polar air, than during the summer months..in winter, the mean position of the polar front extends from florida to sw england. exemple 345 More southerly during the winter than during the summer.

Question 169-21 : The arctic front is the boundary between ?

Polar air and arctic air.

exemple 349 Polar air and arctic air.

Question 169-22 : Which of the following statements is correct ?

Normally atmospheric pressure stops falling rapidly behind a warm front, the air temperature rises.

exemple 353 Normally atmospheric pressure stops falling rapidly behind a warm front, the air temperature rises.

Question 169-23 : Which statement concerning the cold front and warm front of a frontal depression in the northern hemisphere is correct ?

The risk of fog is greater ahead of and behind the warm front than ahead of and behind the cold front.

Img622.ahead of and behind the warm front you have stratocumulus with rain and stratus. the risk of fog is greater at the warm front. exemple 357 The risk of fog is greater ahead of and behind the warm front than ahead of and behind the cold front.

Question 169-24 : Frontal thunderstorms are mainly associated with ?

Cold fronts.

Cqb15 july 2011. exemple 361 Cold fronts.

Question 169-25 : An air mass which originates over the north atlantic between 50 and 70 degrees north and is moving in over scandinavia is called ?

Maritime polar air.

Cqb15 august 2011. exemple 365 Maritime polar air.

Question 169-26 : Which of the following statements is correct concerning the typical weather in a warm sector in mid, and high latitudes over continental areas during summer ?

Generally moderate to good visibility, haze, sometimes few or scattered cumulus.

Cqb15 august 2011. exemple 369 Generally moderate to good visibility, haze, sometimes few or scattered cumulus.

Question 169-27 : The air mass affecting position 's' is most likely to be. 377 ?

Maritime tropical and stable.

. 623 exemple 373 Maritime tropical and stable.

Question 169-28 : In a westerly situation, the mean time interval between polar frontal waves in western europe is ?

One to two days.

exemple 377 One to two days.

Question 169-29 : What change in temperature will occur at point a during the next hour. 380 ?

A drop in temperature.

.a cold front is passing over point a.. 639.the air behind a cold front is noticeably colder and drier than the air ahead of it. exemple 381 A drop in temperature.

Question 169-30 : The air mass type advected from a direction indicated by arrow number 6 is designated.. 381 ?

Maritime polar.

Img623 exemple 385 Maritime polar.

Question 169-31 : What change in pressure, will occur at point f, during the next hour. 382 ?

A drop in pressure.

.as the warm front approaches the pressure falls, during the passage of the warm sector pressure is steady and after the cold front has passed pressure will rise. exemple 389 A drop in pressure.

Question 169-32 : During the winter, the air mass type advected from a direction indicated by arrow number 1 is designated.. 384 ?

Maritime arctic.

Ecair16.what are the difference s between 'maritime polar' and 'maritime arctic'... 623.polar air masses maritime artic air masses come from the polar cap, maritime polar air masses are those which begin their life over cold polar seas. exemple 393 Maritime arctic.

Question 169-33 : Which of the following front types is most known for gusty winds ?

Cold front.

exemple 397 Cold front.

Question 169-34 : What average geographical latitude is assumed for the zone of the subtropical high ?

30°n.

exemple 401 30°n.

Question 169-35 : Which of these statements about air masses are correct or incorrect..1 the polar ice caps are source regions of polar air..2 tropical air may have cold air mass properties. ?

1 and 2 are correct.

exemple 405 1 and 2 are correct.

Question 169-36 : Which of the following is correct regarding a cold high pressure area ?

It will decrease in intensity with increasing altitude.

Easa 2014..a cold high pressure area is one in which the temperatures on the horizontal plane decrease toward the center..the pressure deceases rapidly with height. exemple 409 It will decrease in intensity with increasing altitude.

Question 169-37 : What change in temperature will occur at point b during the next hour.. 391 ?

Approximately constant temperature.

Easa 2014...without a scale we can't tell if the cold front will pass through this position during the next hour... but the question statement is during the next hour , not 'in one hour'..spacing of isobars at point b and in front of the cold front are the same, therefore the temperature at point b should remain constant during the next hour because the pressure will not change..in about one and a half hours, we can expect to see a drop in temperature when the cold front will pass above point b. exemple 413 Approximately constant temperature.

Question 169-38 : What are the typical weather conditions in a warm anticyclone over land ?

Fine weather dominates in summer.

.during summer, in the centre of a warm anticyclone over land stationary high pressure zone = flat pressure pattern we have light or no wind. 492.weather is fine but you can get thunderstorms in the afternoon or evening, due to convective activity the land warms causing convective lifting = cb. exemple 417 Fine weather dominates in summer.

Question 169-39 : For this question, use annex 050 061..the weather most likely to be experienced at position 's' is... 394 ?

Frequent heavy showers of rain or snow.

Ecqb03 july 2016 exemple 421 Frequent heavy showers of rain or snow.

Question 169-40 : Regarding thermodynamic stability and ground visibility, what are the difference between a warm air mass and a cold air mass in central europe during summer ?

The cold air mass is unstable and the visibility is better in the warm air mass.

Ecqb03 july 2016 exemple 425 The cold air mass is unstable and the visibility is better in the warm air mass.


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