Definition

Airmen’s Meteorological Information (AIRMET) is an advisory issued by aviation authorities to warn pilots of weather conditions that may be hazardous but are not severe enough to trigger a SIGMET. AIRMETs cover widespread phenomena that can affect aircraft performance and flight safety, especially for smaller or lighter aircraft—including drones operating near controlled or complex airspace.

Usage

Drone pilots use AIRMETs to understand expected weather hazards that could impact flight planning. These advisories may highlight reduced visibility, icing potential, moderate turbulence, strong surface winds, or widespread low ceilings. Commercial UAV operations near airports, heliports, or regulated zones often require checking AIRMETs as part of their weather briefing.

Relevance to the Industry

AIRMETs help drone operators anticipate conditions that could:

• Impact battery performance or shorten flight time
• Reduce GPS reliability or obstacle-detection accuracy
• Increase turbulence risk at altitude
• Reduce visibility for VLOS operations
• Affect sensor performance during mapping or inspection missions

Because drone flights are more susceptible to wind, icing, and visibility issues than manned aircraft, AIRMETs provide essential early awareness for safe RPAS mission planning.

How Does an AIRMET (Airmen’s Meteorological Information) Work?

AIRMETs are issued at regular intervals—typically every six hours—or whenever developing conditions warrant an update. They follow a standardized format and fall into three categories:

• AIRMET Sierra: IFR conditions, extensive mountain obscuration, low ceilings
• AIRMET Tango: Moderate turbulence or strong surface winds
• AIRMET Zulu: Icing potential and freezing-level information

These advisories identify affected regions, timeframes, altitudes, and expected developments. Drone pilots can access AIRMETs through aviation weather platforms, NOTAM briefings, flight apps, or national meteorological systems.

Example in Use

A drone mapping crew plans an early-morning survey near a ridge line. An AIRMET Sierra warns of extensive mountain obscuration and low visibility in the area. The team adjusts timing and altitude, preventing a risky launch and ensuring regulatory compliance.

Frequently Asked Questions About AIRMET (Airmen’s Meteorological Information)

How is an AIRMET different from a SIGMET?
AIRMETs cover widespread but less severe hazards. SIGMETs cover dangerous or extreme weather requiring immediate pilot attention.

Do AIRMETs affect drone flights outside airports?
Yes. Even recreational or remote flights may encounter the hazards described—wind, turbulence, icing, or visibility issues—and should be planned accordingly.

How often do AIRMETs update?
They are typically issued every 6 hours, but unscheduled updates occur whenever conditions change significantly.

Try our wind resistance calculator to help determine if you can fly in advised AIRMET conditions.