The reduced air pressure QFF (pressure at
sea level) is calculated with the following formula:
Explanation of QFF pressure
calculation formula
| Item |
Explanation |
| QFF |
Reduced pressure [hPa] |
| QFE |
Field elevation pressure [hPa] |
| L |
Reduction level [m] (altitude) |
| T1 |
7996 + 0.0086 * L + 29.33 * TA |
| TA |
Air temperature [°C] |
| The reduction level is the elevation difference of the station altitude
and the mean sea level. |
Inputs for QFF pressure
calculation
| Input |
Variable |
| Air temperature (TA) |
TAAVG1M (average 1‑minute temperature) |
| QFE pressure |
QFEAVG1M (average 1‑minute QFE pressure) |
| Reduction level (L) |
Station parameter altitude |