IR.I.B.K3hFAA-S-ACS-8C · Nov 2023Knowledge
h. Thunderstorms and microbursts
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: h. Thunderstorms and microbursts
Bottom line
Thunderstorms are adverse conditions—significant weather that may influence a pilot's decision to cancel or alter the route of flight. Pilots should not expect ATC to keep weather displayed continuously.
Key numbers
| Number | What it means |
|---|---|
| 15 to 20 minutes old by the time the mosaic is assembled and displayed in a cockpit | NEXRAD age |
| Review when departure time is 6 hours or more away | Outlook briefing |
| Significant changes expected within 1 hour before and after the ETA | Destination forecast |
FAA references
- PHAK ch. 13 (p. 13-5) — FAA-H-8083-25C (2023)
- PHAK ch. 13 (p. 13-2) — FAA-H-8083-25C (2023)
- AC 91-92, paras. 7.4.1.1, 7.6, 7.7 — AC No: 91-92
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