| Categories |
|---|
| UTC | Hour of the day in UTC time. This is the ending hour of the 15-minute valid period. |
| MIN | Minute of the hour indicated in the UTC row above. This is the ending minute of the 15-minute valid period. |
| FLT | Lowest flight category forecasts for 15-minute periods. |
| VFR | Indicates onset/cessation of VFR conditions (“+--” for onset,“---” for prevailing, “--/” for cessation). |
| MVFR | Indicates onset/cessation of MVFR conditions (“+--” for onset,“---” for prevailing, “--/” for cessation). |
| IFR | Indicates onset/cessation of IFR conditions (“+--” for onset,“---” for prevailing, “--/” for cessation). |
| LIF | Indicates onset/cessation of LIFR conditions (“+--” for onset,“---” for prevailing, “--/” for cessation). |
| VLI | Indicates onset/cessation of VLIFR conditions (“+--” for onset,“---” for prevailing, “--/” for cessation). |
| CIG | ceiling height categorical forecasts for each 15-minute period. |
| VIS | visibility categorical forecasts for each 15-minute period. |
| CPVL | Probability of VLIFR conditions or worse due to ceiling during the 15-minute period. |
| CPL | Probability of LIFR conditions or worse due to ceiling during the 15-minute period. |
| CPI | Probability of IFR conditions or worse due to ceiling during the 15-minute period. |
| CP2K | Probability of ceiling height <= 2000 feet during the 15-minute period. |
| CPM | Probability of MVFR conditions or worse due to ceiling during the 15-minute period. |
| CPVFR | Probability of VFR conditions due to ceiling during the 15-minute period. |
| VPVL | Probability of VLIFR conditions or worse due to visibility during the 15-minute period. |
| VPL | Probability of LIFR conditions or worse due to visibility during the 15-minute period. |
| VPI | Probability of IFR conditions or worse due to visibility during the 15-minute period. |
| VPM | Probability of MVFR conditions or worse due to visibility during the 15-minute period. |
| VPVFR | Probability of VFR conditions due to visibility during the 15-minute period. |