RVR is measured between 50m and 1500m (ICAO). When the actual RVR is below 50m, what does METAR show?
- If the RVR is less than the minimum value that can be measured , M will precede this value e.g. R24L/M0050.
If measured in ft, then FT will follow. For example: R24L/M0200FT
For greater than can be measured and trends:
- If the RVR is greater than the maximum value that can be measured, P will precede this value e.g. R24L/P1500.
- If RVR trends can be measured then U, D, or N will follow the RVR value to indicate increasing, decreasing or no change respectively.