Search results
Results From The WOW.Com Content Network
Updrafts and downdrafts, along with wind shear in general, are a major contributor to airplane crashes during takeoff and landing in a thunderstorm. Extreme cases, known as downbursts and microbursts, can be deadly and difficult to predict or observe.
Strong updrafts lift the air turning about a horizontal axis and cause this air to turn about a vertical axis. This forms a deep rotating updraft, the mesocyclone . Wind shear (red) sets air spinning (green).
This explains why updrafts underneath the base of a cumulonimbus are often laminar. This phenomenon is well known by glider pilots. [16] (see below). The phenomenon is enhanced under the weak echo region of a supercell thunderstorm that is extremely dangerous. At approximately 4 kilometres (13,000 ft) these smooth updrafts become suddenly very ...
The leading area of a squall line is composed primarily of multiple updrafts, or singular regions of an updraft, rising from ground level to the highest extensions of the troposphere, condensing water and building a dark, ominous cloud to one with a noticeable overshooting top and anvil (thanks to synoptic scale winds).
The second method occurs during a supercell thunderstorm, in updrafts within the storm. When winds intensify, the force released can cause the updrafts to rotate. This rotating updraft is known as a mesocyclone. [8] For a tornado to form in this manner, a rear-flank downdraft enters the center of the mesocyclone from the back. Cold air, being ...
The strong updrafts delineated by overshooting tops can act as a barrier against the surrounding flow of air. Fast stratospheric winds may rise slightly upon encountering overshooting tops, cooling and producing a turbulent wake of cooler temperatures downstream of the updraft.
Botulism can cause double or blurred vision, slurred speech, drooping eyelids and difficulty swallowing or breathing. As symptoms progress, the muscles become progressively weakened.
The PSCZ has been suggested as the cause of greater precipitation over Glacier Peak relative to other mountains in the Cascades to the east of Puget Sound. As there are no weather stations near Glacier Peak, it remains unclear whether that area actually receives greater precipitation than elsewhere in the Cascade Range.