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| | D-31, Chapter, Part 2 |
 | | A complete aviation terminal forecast shall include a forecast of surface wind, visibility, weather and clouds (or vertical visibility into a surface-based obscuration) and any expected significant change(s) to one or more of these elements during the specified time period, which shall ordinarily be 24 hours. |
 | | For terminal forecasts with less than 24-hour observational coverage, or for which part-time terminal forecasts are provided, the terminal forecast shall be valid to the end of the routine scheduled forecast period even if observations have ceased prior to that time. |
 | | Routine terminal forecast issuances should be completed by the forecaster and transmitted 20 to 40 minutes before the beginning of the forecast valid period, e.g., no later than 0540 UTC for a terminal forecast valid from 0600 to 0600 UTC. |
| www.nws.noaa.gov /oso/oso1/oso12/d31/D-31prt2.htm (2931 words) |
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