MET REPORTS

Question 1

What is a TREND in a METAR?

Answer 1

A short period forecast covering likely changes in weather conditions in the two hours following the observation

Question 2

What windspeed is 12MPS in knots?

Answer 2

24. Double the value in m/s (MPS)

Question 3

What does NOSIG mean in a METAR?

Answer 3

NOSIG is an example of a TREND forecast which is appended to METARs at stations while a forecaster is on watch. NOSIG means that no significant change is expected to the reported conditions within the next 2 hours.

Question 4

Define CAVOK?

Answer 4

CAVOK = Ceiling And Visibility OK, indicating no cloud below 5,000 ft or the highest minimum sector altitude and no CB or towering CU at any level, a visibility of 10 km (6 mi) or more and no significant weather change.

Question 5

What is the difference between an A01 and A02 auto weather station?

Answer 5

A01 has no precipitation sensor but A02 has that sensor

Question 6

What is the meaning of:

1. TSB
2. SNE
3. RAB
4. NCD
5. NDV
6. SLP134

Answer 6

1. Thunderstorm began…
2. Snow ended…
3. Rain began…
4. No cloud detected
5. No directional variation
6. Sea level pressure 1013,4

Question 7

What is the difference between MIST and FOG in weather reports?

Answer 7

MIST (BR) = Over 1000m VIS

Question 8

What does SF5NS3 mean?

Answer 8

Stratofractus 5 oktas, Nimbostratus 3 oktas

Question 9

What does RF00,5/001,8 mean?

Answer 9

0,5mm rain in the last 10 min and 1,8mm rain since 09:00 local time.

Question 10

//
////
//////  what does these signs mean?

Answer 10

``
// = No data available for weather
//// = No data available for Visibility
////// = No data available for Cloud
~~~

Question 11

Define TEMPO?

Answer 11

Changes will not last for more than 1h at a time, nor take up in total more than half the period specified

Question 12

What is the max RVR reported?

Answer 12

1500m

Question 13

How often is a TAF issued and for how long are they valid?

Answer 13

Issued every 6 hours and valid for 24- or 30 hour period