You need warm, moist air from the Gulf of Mexico and cool, dry air from Canada. When these two air masses meet, they create instability in the atmosphere. A change in wind direction and an increase in wind speed with increasing height creates an invisible, horizontal spinning effect in the lower atmosphere. Rising air within the updraft tilts the rotating air from horizontal to vertical.
An area of rotation, miles wide, now extends through much of the storm. Most strong and violent tornadoes form within this area of strong rotation. Enhanced, Operational Fujita Scale. Light damage: Branches broken off trees; minor roof damage.
EFO mph. If a tornado is suspected, a tornado warning is issued for the affected area. However, while Doppler radar can interrogate severe storms very well, it cannot always detect the small-scale processes that actually lead to tornadogenesis. Therefore, trained storm spotters, public officials, and the media also are vital in the warning process by gathering, relaying, and disseminating pertinent observed weather information.
This partnership facilitates the proper detection and warning of tornadoes for the general public. Damage results from the strong winds within a tornado. The degree of damage and speed of these winds vary widely, depending on the intensity of the tornado. The Fujita Scale is designed to assess damage produced by tornadoes, then estimate associated wind speeds by assigning an "F" rating.
The scale ranges from F0 weak tornado with winds up to 72 mph to F5 very violent tornado with winds around mph.
The vast majority of tornadoes range from F0-F3. All tornadoes produce damage, but the most violent ones can cause automobiles to become airborne, rip homes to shreds, and turn broken glass and other debris into lethal missiles. The biggest tornado threat to human beings is from flying debris in the wind. It is important to note that straight-line winds from a thunderstorm can do damage similar to an F0 or F1 tornado. What is the smallest, largest, and average size? Tornadoes can vary significantly in size and intensity.
Thus, the easiest way to answer this question is to assess the size of the damage path. However, the term "average" can be misleading, since the majority of tornadoes are small compared to the infrequent large events. With this said, the typical tornado damage path is about one or two miles, with a width of around 50 yards.
The largest tornado path widths can exceed one mile, while the smallest widths can be less than 10 yards. Widths can even vary considerably during a single tornado, since its size can change during its lifetime.
Path lengths can range from a few yards to more than miles. A key point to remember is that the size of a tornado is not necessarily an indication of its intensity. Large tornadoes can be relatively weak, while small tornadoes occasionally can be violent. How long and fast is a tornado on the ground?
Detailed statistics are not available to answer this question. The name refers to the cone-shaped centre of the large, brightly coloured flowers. The unusual two-tone petals almost glow with brightness as they meet at the large, reddish brown central cone of the flower. The green edges become more pronounced as the plant ages, and it will take a couple of years for them to be at their very best.
If you leave faded flowers on the plant, the seed heads will be enjoyed by your garden birds. Supplied as 3 garden ready plants, ready to plant, growing to a height of 60 cm 2 ft and spread of 40 cm 16 in.
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