⚖ Weather · FAA Aviation Weather Services / PHAK Chapter 13WX-025 · 128 of 261

What is the primary value of a Pilot Weather Report (PIREP) compared to other weather products?

APIREPs provide legally binding weather forecasts for flight planning purposes.

BPIREPs provide real-time firsthand observations of actual in-flight conditions that cannot be obtained from any other source.✓

CPIREPs replace the need for a standard weather briefing for local flights.

Why →PIREPs are firsthand observations from pilots who have recently flown through an area, the only source of actual in-flight conditions rather than modeled or forecast data. They report cloud bases and tops, turbulence intensity, icing encounters, and visibility. FAA requires ATC to solicit PIREPs when ceilings are below 5,000 feet or visibility is at or below 5 miles.

The trap →PIREPs are observations, not forecasts, and carry no legal force. They supplement a briefing; they do not replace one.

Field note →For drone pilots, low-level turbulence and wind shear PIREPs matter most. An urgent PIREP (UUA) for severe turbulence at 3,000 feet near your flight area is a much stronger go/no-go signal than an area forecast. Check PIREPs through 1800wxbrief.com or preflight apps.

SOURCE → FAA Aviation Weather Services / PHAK Chapter 13CHECKED JUL 16ACS III.A.K1MED

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