MET Q13 - Visibility Flashcards
“The suspension of microscopic water droplets in the air reducing visibility at the earth’s surface to < 1000m” defines which type of weather phenomenon?
Select one:
a.Mist
b.Fog
c.Haze
d.Smog
b.Fog
According to the WMO, visibility in low level cloud is likely to be
Select one:
a.500m
b.10 - 30m
c.50 - 1000m
d.Greater than 1000m
b.10 - 30m
Below is the forecast for the destination of a flight whose ETA is 20:30 UTC:
TAF EGHI 120600Z 1212/1306 17010KT 3000 SCT005 BECMG 1218/1220 VRB03KT 0300 FG VV///=
What can be said about the destination airport at 20:30 UTC, if CAT II ILS minima is RVR 350m and a DH 100ft are being considered in accord with company ops?
Select one:
a.Still usable because the decrease in visibility below the CAT II minima will be a little later than 2200 UTC
b.This is likely to be below company minima.
c.Still usable at 2030 UTC because the weather change is not completed before 2200 UTC
d.usable the whole night because 3000 m of met visibility corresponds to at least 900 m RVR
b.This is likely to be below company minima.
What conditions are most likely to lead to the formation of hill fog?
Select one:
a.Precipitation lifted by moderate winds striking the hills
b.High relative humidity in unstable air
c.Clear skies with light winds
d.Humid air blown towards hills
d.Humid air blown towards hills
Which of the following is described within the lower atmosphere as an obscuration?
Select one:
a.Rain
b.Hail
c.Dust
d.Snow
c.Dust
A slight obscuration of the lower atmosphere, typically caused by fine suspended particles of a solid nature” is a description of?
Select one:
a.Smoke
b.Mist
c.Haze
d.Fog
c.Haze
The following definition is given to which type of fog? “When rain, falling from relatively warm air, evaporates into cooler air close to the surface and causes it to become saturated”.
Select one:
a.Frontal fog
b.Hill fog
c.Advection fog
d.Steam fog
a.Frontal fog
What conditions would most likely cause the formation of advection fog?
Select one:
a.calm, clear skies at night
b.Cool air mass moving across a warmer surface
c.warm air blowing towards high ground
d.Mild air mass blown over a colder surface
d.Mild air mass blown over a colder surface
In which of the following METAR reports, is the probability of fog formation in the coming night the highest?
Select one:
a.1850Z 15003KT 6000 SCT120 05/04 Q1032 BECMG 1600BR=
b.1850Z 21003KT 8000 SCT250 12/M08 Q1028 NOSIG=
c.1850Z 05018G30KT 5000 OVC010 04/01 Q1024 NOSIG=
d.1850Z 25010KT 4000 RA BKN012 OVC030 12/10 Q1006 TEMPO 1500=
a.1850Z 15003KT 6000 SCT120 05/04 Q1032 BECMG 1600BR=
On a relatively clear and calm evening in early winter, you receive the ATIS for your arrival into Geneva and notice that the temperature and dew point are 1 degree C and minus 1 degree C respectively. What is most likely to occur over the course of the night and into the early morning?
Select one:
a. precipitation is likely
b.radiation fog may develop
c.the wind will strengthen
d.low cloud will form
b.radiation fog may develop
