Lightning hazard on the apron areaThe interruption to outdoor activities performed by apron area will remain until the lightning threat has passed, halting all departure and arrival operations for the whole duration of a thunderstorm.
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What can cause a cancellation? Flights may be canceled due to wind, precipitation, fog or low visibility, lightning, low clouds, or storms.
The type of weather that delays and cancels flights is called inclement weather. Inclement weather is categorized as thunderstorms, snowstorms, wind shear, icing, and fog. Any inclement weather is by far the most hazardous. This is the type of weather that causes the most cancellations and delays, not just rain.
Thunderstorm and especially lightning pose a safety risk to airline and airport personnel that work outdoors servicing gate-side parked aircraft and maintaining airport grounds. Thus, airport and airline stakeholders at major airports employ procedures to ensure the safety of their outdoor workers.
Pilots should observe the following rules for any flight routed even potentially near actual or possible thunder- storm activity: Avoid all thunderstorms. Never go closer than 5 miles to any visible storm cloud with overhanging areas, and strongly consider increas- ing that distance to 20 miles or more.
Lightning usually strikes an aircraft on the front side of the plane's cockpit. The edge of the cockpit window is a typical point of impact. The aluminium fuselage of the aircraft conducts electricity well, and due to that, the lightning discharge does not affect the inside of the aircraft.
Heavy snow or blizzards can make landing and taking off too dangerous, while lightning storms can be very hazardous to any aircraft. Extreme heat can also interfere with an aircraft's performance, so in hotter parts of the world, extreme temperatures can cause significant delays.
In 2022, 2.7 percent of all U.S. domestic flights were canceled—the highest rates in the past decade, not counting 2020. Another 23 percent of all domestic flights were delayed, according to the Bureau of Transportation Statistics.
Turbulence, associated with thunderstorms, can be extremely hazardous, having the potential to cause overstressing of the aircraft or loss of control. Thunderstorm vertical currents may be strong enough to displace an aircraft up or down vertically as much as 2000 to 6000 feet.
Rain is just water, no matter the pressure. Modern aircraft can generate lift regardless of the heaviness of the rain. Planes can and will take off and land in the rain. The only real problem with heavy rainfall is the decrease in visibility for the pilots.
Such standards were implemented after a severe lightning strike accident occurred involving a Pan Am Boeing 707. The jet exploded in flight after vapors in the fuel tank ignited.