| Abbreviation | Definition |
|---|---|
| PDR | Pulse Doppler Radar |
| PDSI | Palmer Drought Severity Index |
| PE | Planet Earth |
| PEMIII | Portable Engineering Moire Interferometer (Model #2) |
| PERSIST | Pressure Equalized Rain Screen Insulated Structure Technique |
| PF | Purification Factor |
| PFR | Pray For Rain |
| PGF | Pressure Gradient Force |
| PHNL | Honolulu Airport Weather Station |
| PHWM | Parametric Hurricane Wind Model |
| PHWW | Peak Hourly Wet Weather |
| PIBALS | Pilot Balloon Reports (meteorology) |
| PICS | PC Imaging Communications System |
| PIL | Pilar, Argentina Geomagnetic Observation code |
| PIRATA | Prediction and Research Moored Array in the Tropical Atlantic |
| PIREP | Pilot Report |
| PIWW | Peak Instantaneous Wet Weather |
| PJS | Polar Jet Stream |
| PL/GP | Phillips Laboratory, Geophysics Directorate |
| PM2.5 | Particulate Matter 2.5 microns |