| Acronym |
Definition |
| Wake Turbulence |
Wingtip vortices generated behind a wing producing lift. Behind a large heavy aircraft they can be powerful enough to roll or even break up a smaller aircraft. |
| WAT |
Weight-and-Temperature. |
| WEF. |
With Effect From. |
| WIE |
With Immediate Effect. |
| Wind Shear |
Localised change in wind speed and/or direction over a short distance, resulting in a tearing or shearing effect. |
| WIP |
Work in progress. |
| WP |
Waypoint. |
| WT |
Weight |
| WX |
Weather. |
| WX NIL |
No significant weather, term used in Met reports. |
