Arabia Weather - Tropical cyclones are not usually accompanied by lightning, due to the activity of horizontal winds in hurricanes more than vertical winds, as lightning and thunder need high vertical shear winds to occur for their generation, which is necessary for hailstones to collide with each other to produce electrical lightning charges. However, Lightnings are sometimes seen at the edges of the eye of the hurricane from within in some tropical cases, especially those at advanced levels. In this case, they arise as a result of a collision between cold, dry, descending air with warm, moist, ascending air. Then, shear winds are active in a geographically narrow range, and we see Then lightning flashes at the edges of the eye.
Tropical conditions are also not accompanied by the fall of hailstones, due to the high warm humidity that accompanies them, and the elevation of the freezing line, which is directly responsible for the formation of hail into the high layers of the atmosphere.
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Some additional information about tropical states:
Conditions for the formation of orbital states:
- The presence of an area of low air pressure that attracts winds and causes strong upward air currents with a circular rotational movement.
- The surface temperature of seawater is so warm, exceeding 27°C, that the warm water and the resulting water vapor are the fuel that powers tropical systems.
- Weak wind shear, because wind shear limits the vertical growth of cumulus clouds, that is, they hinder the process of increasing the thickness of the clouds.
Classification of tropical cases...the two most prominent classifications:
- Tropical conditions are classified according to the speed of the surface winds around the center (according to the Saffir-Simpson scale). The classification reaches a tropical storm when the speed of the surface winds around the center reaches at least 34 knots, and then a name is given to it. The naming of tropical conditions over the northern Indian Ocean began in the year 2004, and the classification reaches a tropical cyclone if the surface wind speed around the center reaches at least 64 knots.
- There is another measurement to measure the severity of orbital conditions, using the Dvorak technique, which relies on satellite images to estimate the severity of the orbital condition.
Hurricane structure:
- The diameter of a tropical cyclone ranges from 200 to 1,000 km.
- It is characterized by the presence of the eye of the hurricane, which is the area of the center of the hurricane’s rotation. Although it is surrounded by raging storms and strong winds, it is characterized by a calm atmosphere and calm winds. Hurricanes that are accompanied by a large eye are considered an indicator of the hurricane not deepening and the beginning of its weakening, unlike hurricanes with a small eye, which are an indicator of the hurricane deepening and further development.
- The circular ring surrounding the eye of a hurricane is called the tornado wall and is the most dangerous part of a tornado's structure, so residents of the area where it is expected to cross the eyewall are usually evacuated as a precaution.
- The outer band of the hurricane: This part extends to the periphery of the hurricane and leads to the formation of deep and powerful thunder cells.
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