Based on these conditions, determine the cold temperature correction required for the published minimum IFR altitudes, and corrections to Alternate Weather Minima
The solution rounds UP the DH/MDA indicated altitudes to the next 10', and rounds UP the indicated FAF crossing and Procedure Turn altitudes to the next highest 100' increment.
If the height above the elevation of the altimeter setting source is below 200', the 200' values are used.
Altitude adjustments resulting from low temperature corrections are displayed in blue. e.g.
(+246.8)
Altitude and visibility adjustments resulting from high pressure corrections are displayed in olive. e.g.
(+200.0) or (+½)
| Generated Value | Range of values |
|---|
| Winds | Speed: 0 to 30 knots| Additional Attributes | Probability | Range |
|---|
| Gusts | 50% | 5 to 15 knots higher than the base wind speed | | Variable direction (when gusting) | 10% | 10° and 30° left / right |
|
| Visibility | Randomly selected from :0, 1/8, 1/4, 3/8, 1/2, 5/8, 3/4, 1, 1 1/4, 1 1/2, 1 3/4, 2, 2 1/4, 2 1/2, 3, 4SM |
| RVR | 100' to 6300'| Additional Attributes | Probability | Range |
|---|
| RVR Inoperable | 5% | | | RVR Fluctuating | 30% | 100' to 6300' |
|
| Present Weather | Randomly generated based on:
| Intensity | Warm precipitation | Cold precipitation | Obscuration |
|---|
| | | |
When visibility < ⅝ in light winds, the obscuration will be FG or FZFG Heavy intensities with warm precipitation will include BR |
| Cloud layers | First layer calculated based on temperature/dewpoint. If winds with gusts exceed 15 KTS, the first layer is cumliform. Otherwise 50% chance layer is cumliform. Below 10000'ASL, gap between layers 100' to 800', Above 10000'ASL, gaps is 1000' to 3000' Stop generating cloud after 1 OVC (including VV) or 2 BKN layers. No more than 2 SCT layers after first layer |
| Temperature | -50°C to 15°C| Additional Attributes | Probability | Range |
|---|
| Temperature / Dewpoint spread | | 0 to 20°C |
|
| Altimeter Setting | 30.80"Hg to 31.60"Hg |