| Below 900 m (3.000 ft) or below the highest minimum sector altitude, whichever is the greater |
| Below 1 500 m (5.000 ft) or below the highest minimum sector altitude, whichever is the greater |
| Cumulonimbus |
| Below 2 000 m (600 ft) or below the highest minimum sector altitude, whichever is the greater |
EN 