| B | Blue |
| BA | Braking action |
| BASE | Cloud base |
| BC | Localizer Back Course |
| BCFG | Fog patches |
| BCN | Beacon (aeronautical ground light) |
| BCST | Broadcast |
| BDRY | Boundary |
| BECMG | Becoming |
| BFR | Before |
| BKN | Broken |
| BL... | Blowing (followed by DU=dust, SA=sand, SN=snow) |
| BLDG | Building |
| BR | Mist |
| BRG | Bearing |
| BRKG | Braking |
| B | RNAV Basic area navigation |
| BS | Commercial broadcasting station |
| BTL | Between layers |
| BTN | Between |
© 2012-21 Kristina Novotna