AA.I.C.K3eFAA-S-ACS-11A · Nov 2023Knowledge
e. Weather system formation, including air masses and fronts
Meteorology applicable to the departure, en route, alternate, and destination for flights conducted under Instrument Flight Rules (IFR) to include expected climate and hazardous conditions such as: e. Weather system formation, including air masses and fronts
Bottom line
A warm front is the boundary area formed when a warm air mass contacts and flows over a colder air mass. An occluded front occurs when a fast-moving cold front catches up with a slow-moving warm front. The synopsis portion of a briefing describes the type, location, and movement of weather systems and/or air masses that might affect the proposed flight.
Key numbers
| Number | What it means |
|---|---|
| 1 hour before and after ETA (destination forecast changes) | Alternate forecast |
| 6 hours or more before departure | Outlook window |
FAA references
- PHAK Glossary (p. G-34) — FAA-H-8083-25C (2023)
- PHAK Glossary (p. G-22) — FAA-H-8083-25C (2023)
- AWH ch. 3 (p. 3-4) — FAA-H-8083-28A
- AC 91-92, para. 7.6 — AC No: 91-92
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