| Category | Ceiling | Visibility | |
| Low Instrument Flight Rules LIFR |
below 500 feet AGL | and/or | less than 1 mile |
| Instrument Flight Rules IFR |
500 to below 1,000 feet AGL | and/or | 1 mile to less than 3 miles |
| Marginal Visual Flight Rules MVFR |
1,000 to 3,000 feet AGL | and/or | 3 to 5 miles |
| Visual Flight Rules VFR |
greater than 3,000 feet AGL | and | greater than 5 miles |
| * IFR is ceiling less than 1,000 feet AGL and/or visibility less than 3 miles while LIFR is a sub-category of IFR. + VFR is ceiling greater than or equal to 1,000 feet AGL and visibility greater than or equal to 3 miles while MVFR is a sub-category of VFR. Keep in mind that you can not have IFR in class G airspace. The flight rules shown in the chart are based upon the lowest cloud base. When using these forecasted flight rules, keep in mind the percent of cloud cover. |
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