Do flights get canceled because of storms?

How Thunderstorms Effects Flights. Generally, flights get canceled or delayed when air traffic indicates to airports about the thunderstorms or severe weather conditions that could occur on airplanes that are about to take off. It's the most measured and in-time decision that is being made by the airlines.



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Crosswinds greater than 50-60 km/h may cause airlines to delay or cancel flights. Even lower gusts can trigger flight delays or cancellations if the runways are wet or icy, as stiff winds can reduce a plane's ability to brake on the runway.

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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.

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With this in mind, horizontal winds (also known as “crosswinds”) in excess of 30-35 kts (about 34-40 mph) are generally prohibitive of take-off and landing. As far as how this happens, it depends on where you are in flight.

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Turbulence might occur during your flight in rainy weather due to the presence of different air masses mixing together and causing disturbances aloft. Warm and cold air masses interacting with each other can result in turbulent conditions high in the sky, making your flight potentially more uncomfortable.

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“It is 'normal' to expect around 1 to 2 percent of flights to be canceled,” said Gary Leff, author of ViewFromTheWing.com. He added that around 20 to 25 percent of flights are late by at least 15 minutes, though it's harder to track the range of how delayed flights are.

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While thunderstorms can be quite visible when they are flashing and banging, they don't display either of these characteristics during certain stages. In the case of commercial aircraft, pilots will utilize a weather radar. Information regarding thunderclouds will be displayed on their navigational displays.

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Pretty much any airplane can easily fly in 25 mph winds. If that is a direct crosswind that might make landing smaller aircraft more challenging, but airliners, no problems.

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