| Term | Definition / Meaning / Stand for |
| ZDR |
Differential Reflectivity (radar product) |
| ZL |
Freezing Drizzle (METAR code) |
| ZR |
Freezing Rain (METAR code) |
| ZN |
Zenith (point directly overhead) |
| ZAA |
Zenith Angle of Arrival |
| ZHD |
Zenith Hydrostatic Delay |
| ZRF |
Zenith Radiative Flux |
| ZRS |
Zenith Reflective Scatter |
| ZRH |
Zenith Relative Humidity |
| ZTM |
Zenith Temperature Model |
| ZNT |
Zenith Temperature |
| ZTP |
Zenith Total Precipitable Water |
| ZWD |
Zenith Wet Delay |
| ZEE |
Zenithal Energy Exchange |
| ZGR |
Zero Gradient |
| ZPG |
Zero Pressure Gradient |
| ZAM |
Zonal Atmospheric Motion |
| ZAW |
Zonal Atmospheric Water |
| ZBI |
Zonal Boundary Index |
| ZCF |
Zonal Circulation Forecast |
| ZCI |
Zonal Circulation Index |
| ZCP |
Zonal Circulation Pattern |
| ZCM |
Zonal Climate Model |
| ZCG |
Zonal Cloud Growth |
| ZCIT |
Zonal Convergence Intertropical |
| ZCZ |
Zonal Convergence Zone |
| ZDL |
Zonal Data Logger |
| ZDR |
Zonal Downward Radiation |
| ZEN |
Zonal Elevation Network |
| ZEB |
Zonal Energy Balance |
| ZEI |
Zonal Energy Input |
| ZES |
Zonal Energy System |
| ZEL |
Zonal Equatorial Line |
| ZNS |
Zonal Flow (west to east atmospheric flow) |
| ZFT |
Zonal Flux Trend |
| ZFE |
Zonal Front Event |
| ZGL |
Zonal Geopotential Level |
| ZGR |
Zonal Geopotential Response |
| ZGM |
Zonal Gradient Model |
| ZHG |
Zonal Heat Gradient |
| ZHT |
Zonal Humidity Trend |
| ZID |
Zonal Index Deviation |
| ZIM |
Zonal Index Model |
| ZITCZ |
Zonal Intertropical Convergence Zone |
| ZIL |
Zonal Inversion Layer |
| ZLM |
Zonal Layered Model |
| ZLCL |
Zonal Lifted Condensation Level |
| ZLA |
Zonal Low Anomaly |
| ZLF |
Zonal Low-Frequency |
| ZMP |
Zonal Mean Pressure |
| ZMB |
Zonal Moisture Budget |
| ZMPH |
Zonal Moisture Profile Height |
| ZMR |
Zonal Moisture Redistribution |
| ZME |
Zonal Momentum Equation |
| ZNAP |
Zonal Net Atmospheric Pressure |
| ZND |
Zonal Neutral Density |
| ZNE |
Zonal Neutral Event |
| ZNSL |
Zonal Neutral Stability Line |
| ZNS |
Zonal Neutral Structure |
| ZNCL |
Zonal Nocturnal Cloud Layer |
| ZNT |
Zonal Nocturnal Transition |
| ZNL |
Zonal Numerical Limitation |
| ZOC |
Zonal Oceanic Circulation |
| ZOS |
Zonal Oceanic System |
| ZOI |
Zonal Oscillation Index |
| ZOT |
Zonal Oscillation Theory |
| ZPM |
Zonal Precipitation Model |
| ZPSL |
Zonal Precipitation Strength Line |
| ZPAF |
Zonal Pressure Anomaly Forecast |
| ZPA |
Zonal Pressure Anomaly |