Weather Reporting Flashcards
Define: special air-report.
Routine air-report containing significant weather information.
What weather conditions must be present in order to be classified as CAVOK?
❅ visibility ≥ 10 km
❅ no clouds below 5,000 ft AGL
❅ no CB or TCU
❅ no SIGMET
Give the form of a routine air-report.
❅ usual position report
❅ wind
❅ temperature
❅ any significant weather observations
In what units is RVR measured?
In metres.
When should routine air-reports be made?
After passing compulsory reporting points, or every one hour.
When would a runway be considered contaminated?
When more than 25 % of the runway is covered in standing water, snow, slush, frost, or ice.
Where is RVR usually measured on the runway?
❅ TDZ
❅ mid-point
❅ stop-end
What’s the difference between RVR and IRVR?
RVR: obtained by visual observation.
IRVR: obtainted by using instruments.
In which cases will runway conditions be reported?
When the runway is wet or contaminated.
How is cloud cover reported?
In oktas.
FEW (few): 1-2/8.
SCT (scattered): 3-4/8.
BKN (broken): 5-7/8.
OVC (overcast): 8/8.
Define: standing water.
Water on the runway that is deeper than 3 mm.
When are routine air-reports not necessary?
❅ when flying in a radar-covered area
❅ when the flight duration is two hours or less
❅ when the aircraft is within an hour of landing
What is the unit used when reporting visibility?
Visibility less than 5 km: in m.
Visibility more than 5 km: in km.
Why is VOLMET particularly useful?
It can provide arrival data before the destination ATIS is in range.
In which cases will braking action be reported?
When the runway is covered with snow or ice.
What does it mean if a runway is described as:
(a) dry
(b) damp
(c) wet
(d) containing water patches
(e) flooded
(a) the runway is not affected by meteorological phenomena
(b) the runway is showing a change of colour due to moisture
(c) up to 25 % of the runway is covered in standing water
(d) more than 25 % of the runway is covered in standing water
(e) more than 50 % of the runway is covered in standing water
List the braking action parameters, particularly:
❅ code
❅ estimated braking action
❅ related friction coefficient
1 ❅ poor ❅ 0.25 and below
2 ❅ poor to medium ❅ 0.26 to 0.29
3 ❅ medium ❅ 0.30 to 0.35
4 ❅ medium to good ❅ 0.36 to 0.39
5 ❅ good ❅ 0.40 and above
When will the braking action be reported as unreliable?
When more than 10 % of the runway is covered by wet ice/snow and/or slush.
What does report flight conditions from a controller mean?
Indicate whether you’re flying in IMC or VMC.
