September 26, 2022
Camera recordings are down in the US

Camera recordings are down in the US

Last week’s explosion in Wake County, North Carolina, was captured by television cameras. The pictures were taken by a camera mounted on the tower of the TV station. WRAL And severe downdraft of rain accompanied by rain was recorded, which is an isolated phenomenon and it is impossible to predict exactly which zone it will hit.

This type of phenomenon occurs mainly in summer, because it is the time when the days are very hot and because of the high humidity, clouds of large vertical growth of the cumulonimbus (CP) type are formed, which can reach up to 15. Up to 20 kilometers high and capable of generating destructive winds. That’s what caused it Most of the damage was done in Guapa municipality last January.

On its website, the National Weather Service The United States explains what heat is – the violent downdraft of wind – capable of causing as much damage and damage as a hurricane due to the tremendous speed that winds can reach during episodes of this type of event.

“A downburst is a strong and relatively small area of ​​rapidly descending air under a storm, which may be carried to the surface as a result of very strong winds aloft. Or it may be the result of very rapid cooling of air containing rain that evaporates in an initially dry atmosphere. Cold, dense air descends rapidly to the surface.

A downburst differs from normal storm winds in that it is capable of causing damage near the surface, where it spreads or diverges significantly. Conversely, in a cyclone they converge into a narrow strip of land.

Extreme falls can be unique. Wind gusts are highest at Morehead City (North Carolina) at 281 km/h and at Andrews Air Force Base (Maryland) at 254 km/h. Severe downburst episodes can cause sounds and noises that people often refer to as coming from a freight train, which is commonly associated with tornadoes.

Although downbursts are not tornadoes, they can cause damage equal to that of a small or medium tornado, and above all, wind. Depending on the size of the area affected by the wind, downbursts are classified as macrobursts or microbursts. While the damage of macrobursts extends horizontally for more than four kilometers, in microbursts the destructive winds are less than four kilometers.

A cumulonimbus cloud, due to its violent updrafts and downdrafts within and near the cloud, produces severe turbulence, hail, ice formation, lightning, and sometimes tornadoes. Risk of wind shear and violent depressions (microburst).

After several plane crashes caused by downdrafts (lows) in the United States, airports began to have weather radars, and many studies were conducted in the country.

The most famous case is the Delta Flight 191 disaster, in which 137 people died. As the plane was preparing to land at Dallas Airport, the microburst hit an intense downdraft in the storm cloud, and the plane crashed into the ground about a kilometer short of the runway.