It normally occurs when cold, dry air sits on top of warm, moist air. When these conditions occur, if a mass of the warm, moist air is pushed upwards, it continues to climb. However, as height increases, the air cools. When this happens, some of the water vapor condenses to form distinguishable thunderstorm clouds.
As this vapor cools more, it falls as rain and sometimes as hail. When these storms hit the warm water of the Atlantic, things really begin to kick off. With the added available moisture, the thunderstorms being to grow in height and, due to the spinning of the earth, these storms begin to rotate. As this cluster of storms continues to move westward across the ocean, the bigger the thunderstorms grow, the more they rotate.
Eventually, this collection of storms form into one giant rotating mass. As the winds reach 39 mph, the mass is classified as a tropical storm and once they reach 74 mph, it becomes a hurricane. When it comes to aviation, tropical storms bring several weather phenomena that pilots must respect. The combination of strong winds, thunderstorms and heavy rain can be dangerous to flying conditions if the pilots do not take the right steps. To understand why this causes turbulence, we need a basic physics lesson.
Related: How pilots keep you safe while flying through strong winds. Airflow over the wing generates lift. As the aircraft accelerates down the runway, the airflow over the wing increases. When this airflow reaches a critical point, enough lift is generated by the wings to enable the aircraft to leave the ground and start climbing up into the air.
The engines merely provide the acceleration, the wings do the actual flying. Variations in the wind speed and direction mean that at one moment there is more lift, the next moment there is less lift. Multiply this hundreds of times per second and this is what gives you turbulence. The greater the difference in the variations of lift, the great the bumps experienced. This is the case when flying near a tropical storm. Related: What do pilots do during the cruise?
To help smooth this out, the wings act very much like the suspension on your car. When driving down a country road, the suspension rises and falls to dampen the effects each bump has on the passengers.
On an aircraft, the wings are designed to flex and bend to have the same dampening effect, as can be seen in the video below. Whilst it may look alarming to see the wings flexing like this, they are not only doing what they are meant to do but they are even designed to bend far more than any turbulence could make them.
We know that the aircraft is designed to endure forces far greater than any weather system we can expect to encounter. The biggest threat comes from loose items, or people, inside the aircraft. Sometimes we are able to change our cruising altitude where ATC has had reports that it is smoother. When the wind gets really strong, windshear becomes a factor. Now, this may sound the same as turbulence, however, windshear is commonly referred to in the stages of flight close to the ground.
We already know that lift is generated by airflow passing over the wings. If that airflow changes rapidly, the lift can suddenly increase, or worse, decrease. A commercial plane would never be able to fly over that since their upper limits are usually around 40, to 41, feet. They fly right through hurricanes, usually several times, in order to get the various readings about wind speeds, atmospheric pressure, etc.
However their altitude is usually between 1, and 10, feet, so they can get an idea of the readings that will most affect the coastline and land it will ultimately hit. It shows what Hurricane Hunter planes do:. And this video shows footage of a handful of hurricane eyewalls, which, I think, are eerily beautiful.
However, some storms can create turbulence at high altitude and that has to be factored in when choosing a route. Unless there a reason to fly near a hurricane, they are avoided, but if it is necessary, a flight can operate on a limited basis.
Planes will continue to fly into and out of airports until winds reach a certain speed it varies by airport and runway and then the airport shuts down. The wind speed limits depend on the direction.
If it is blowing down the runway, it is possible to land and take off with 40 knots 46 mph or more but if it is blowing across the runway, then around 30 knots 35 mph is the limit. Your question centers on the exposure number of flights vs. Air traffic controllers direct flights around or above severe weather. They do not direct flights through severe storms. While flights above hurricanes can be perfectly safe, they do require a bit of extra planning and attention to detail. While many flights will simply opt to travel around the storm, doing so is not actually required.
As weather predicting and sensing technology improves over time, and as pilots are able to receive more and more real-time weather data while in flight, navigating around and over storms can become more commonplace. For now, most flights will be routed around hurricanes while a few will opt to take a bit of a shortcut right over the top. Terms Apply. Disclaimer: The responses below are not provided or commissioned by the bank advertiser. Responses have not been reviewed, approved or otherwise endorsed by the bank advertiser.
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