| Acronym | Meaning |
 | WVF | Water Vapor Flux |
| WVIOP | Water Vapor Intensive Observing Period |
| WVR | Water Vapor Radiometers |
| WWG | Workstation Working Group Of COMET |
| WWRP | World Weather Research Programme |
| WWV | Call Letters For The NBS Shortwave Radio Station That Broadcasts Time Signals Only |
| WWW | World Wide Web |
| WWW | World Weather Watch |
| WX | Weather |
| WYSIWYG | What You See Is What You Get |
| XANADU | Software Name |
| XMDSL | X Window Interface Distributed Software Library |
| XUV | Extreme Ultraviolet |
| Y/C | Luminance/Chrominance |
| YAG | Yttrium |
| Z | Reflectivity (Lenschow) Or Reflective Factor (FOF) |
| Z-R | Relationship |
| ZAMS | Zero Age Main Sequence |
| ZDR | Differential Reflectivity |
| ZOLD | Zeroth Order Logarithmic Distribution Function |
| ZTD | Zenith Tropospheric Signal Delay |
| ZWA | Zonal Wind Anomaly |
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