Tornadoes

Tornadoes can travel in any direction, but the majority move in an easterly. The most common direction of travel is northeast.

The ranks of EF0 through EF5 are not distinct types of tornado, but are intensity levels. An EF1 tornado is not different from an EF0 tornado in any real way other than that it is stronger at at least one point. The ratings are assigned based on damage and are assigned wind estimates. Here are the categories with the damage that might be expected.

EF0: (65-85 mph) Superficial damage to most structures with peeled shingles, siding and gutters. Tree branches snapped and some trees toppled. Fences may be blown down and weak sheds may be destroyed.

EF1: (86-110 mph) Houses suffer severe roof damage with much of the surface stripped. Windows break. Mobile homes are overturned or severely damaged. Some poorly secured roofs may be torn off.

EF2: (111-135 mph): Roofs are torn from well-built houses but most walls remain standing. Mobile homes are completely destroyed. Cars are lifted and tossed.

EF3: (136-165 mph) Well-constructed houses lose their roofs and many walls. Sometimes only a few interior walls are left standing. Some poorly anchored structures may be blown away.

EF4: (166-200 mph) Well-constructed houses are completely leveled and left as piles of debris. Houses of weaker construction may be blown away. Trees are debarked. Asphalt may be peeled from roads.

EF5: (over 200 mph) Well-constructed houses are blown clean off their foundations and often scattered. Steel-reinforced concrete structures destroyed. Severe ground scouring may occur.

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Contrary to what some might say, there is no particular "tornado sky" that will give you a warning. Tornadoes occur during severe thunderstorms and so will be accompanied by thick, often dark clouds. Heavy rain is often present The clouds often appear gray, as they usually do during a thunderstorm, but may become black, green, yellow, or blue. Such colors often indicate that a thunderstorm may be severe but do not necessarily mean there is potential for tornadoes. One sign that is a potential warning is a wall cloud, which is a rotating mass of cloud that hangs down from the base of the thunderstorm. This however is not always present or may be hidden by rain.

Yes. The rating of a tornado only refers to the worst damage that it causes. Usually only a small percentage of strucures in an EF5 tornado will actually be struck by EF5 winds. Many strutures will be hit by winds that are far less powerful but still capable of causing significant damage. In the aftermath of a tornado it is not uncommon to see houses and other buildings with exterior walls, including brick walls, collapsed while the rest of the structure remains mostly intact.

It varies as different tornadoes move at different speeds. The average tornado, however, moves at about 30 mph. At this speed a tornado would travel a mile in two minutes. Some slow moving tornadoes may move at 10 mph or less. At 10 mph a tornado would travel a mile in six minutes. Some of the fastest-moving tornadoes have traveled at 70 mph. At this speed a tornado would move a mile in just over 50 seconds.

The Daulatpur-Saturia tornado was never rated on the Fujita scale. Bangladesh does not conduct the damage surveys needed to rate tornadoes, and the poor quality of construction makes it difficult to rate damage anyway. However, it is almost certain that the Daulatpur-Saturia tornado was, at the very least, an F3, probably stronger.

Tornado sirens are warning sirens set up in some communities that sound in the event of a tornado warning. This is an effective way of alerting people to danger if they are not tuned into a TV or radio. Many of these are recomissioned air-raid sirens from the Cold War.

There is some potential for tornadoes in the U.S. today September 10, 2014, particularly across portions of Illinoi, Indiana, and Ohio. However, the potential is low enough that is not certain that any will touch down. Beyong that the potential for severe weather in the remainder of the week is low, meaning tornadoes are possible, but unlikely.

The Tuscaloosa/Birmingham tornado of April 27, 2011 injured an estimated 1,500 people and killed 64.

Tornadoes are detected using Doppler weather radar. In recent years some of these radars have been upgraded with dual-polarization to further aid in detectng hail and tornadic debris.

It is possible, but unlikely. Tornadoes are always spawned by thunderstorms, most often coming behind rain or embedded in it. In some cases, however, tornadoes can form with low-precipitation (LP) supercells, which produce little or no rain. In another case, a town was devastated by a tornado that was not preceded by rain as the storm that spawned it essentially moved backwards. Rain did come afterward, however.

Both are natural disasters that result primarily from weather. Both can occur sddenly and can be very destructive.

The air will rise into the upper bottle in bubbles while the water splatters and drips down into the lower bottle. No vortex is formed.

The oldest surviving records of a tornado are of one near Kilbeggan, Ireland on April 30, 1054.

An F5 tornado does not travel at any particular speed. One infamous F5 tornado, the Tri-State tornado of 1925 was at one point seen to be moving at 73 mph. By contrast the Jarrell, Texas tornado of 1997, another F5, ground along at a mere 8 mph. As with most tornadoes, the most common travelling speed is between 30 and 40 mph.

This is not related to the wind speed of the tornado. On the original Fujita scale F5 winds were esimated to fall in the range of 261-318 mph. However, newer estimates suggest that any tornadic wind over 200 mph can cause F5 damage. So currently EF5 winds start at just over 200 mph. Winds as high as 302 mph have been measured in tornadoes.

The two are a comparable as apples and oranges. Other than toting up the amount of kilojoules release by each, there is no way to compare the strength of a tsunami and a tornado.

The two are quite unrelated. A tornado is a strong whirlwind. A tsunami is a powerful wave in the ocean, usually caused by earthquakes.

They are often surrounded by a cloud of dust or debris. sepcially around the lower potions. This applies to tornadoes in the southern hemisphere as well.

Tornadoes do not always appear black. The apparent color depends on lighting conditions and how much and what color of soil is being lifted. Many tornadoes appear dark because of perspective: the are lit from behind and are essentially silhouetted against the light source. The same tornado may appear lighter if viewed from a different angle. The storms that spawn tornadoes have very thick clouds that often making conditions appear very dark. The clouds themselves may be black. Some tornadoes may be black as they lift large amounts of black soil into the air.

both types of rubrics have a rating scale: both general and specific rubrics

In the Unite States, the average peak of tornado activity is in May.

If you can, go to a basement or cellar. If you cannot get underground, go to an interior room or hallway on the lowest floor. Bathrooms often provide good shelter.

Never. A downspout is completely different from a tornado. It is a pipe that drains water from a rain gutter.

A tornado on water is called a waterspout. A tornado that forms without a mesocyclone is a landspout.

The best place to go is room or hallway in the center part of the house on the lowest floor. A bathroom often provides good shelter. Avoid windows if possible.