Monday, 10 Dec 2018

"Please miss this farm": a video from Illinois Chaser gives an overview of the characteristics of the tornado

Cory Pagel, an experienced storm hunter, has found himself face to face with a tornado near Bluff City, in Illinois. Its proximity and location allowed us to take a unique look at the twister, which was one of the least 27 to have touched the worst epidemic soil from December to date. The National Weather Service in Lincoln, Illinois confirmed that this tornado from the EF-1 was on the ground for 27 minutes. It has occasionally swept the landscape east of Highway 100 in Illinois, with winds of about 100 km / h. The counties of Schuyler and Fulton were the hardest hit. The weather service reported that the tornado had caused "considerable" damage to trees and a cellar, as well as a number of houses, but had neither injured nor killed. Pagel's video on the animal storm is remarkable. He approaches the rain-free base west of the traffic, the voracious voracious searching the fields in front of him. Interacting with such a tornado is risky – in this case, the hail the size of a table tennis ball falls one kilometer behind it, in addition to the tornado. In this case, his calculated bet paid off. The video begins with a bang as a farm is in the line of sight of the twister, prompting the hunter to plead: "For God's sake, please, shut up this farm!" The perfectly immobile trees in the foreground mark a curious contrast with the funnel barely roaring the length of a football field. Some branches begin to swing while the winds blowing in the tailwind (a breath of fresh air coming out of the storm) wave the air.
Radar at the time of the tornado. (GR2Analyst via author) Moments later, the tornado emerges from behind a group of trees. Thin filaments resembling dirt and condensation form around the center of the vortex. These suction swirls are only a few meters wide, but their winds increase the rotational speed of the parent funnel and can produce narrow bands of exceptional damage. To the right of the condensation funnel, a cloudy patch of soil persists in the wake of the tornado. This is the result of a rapid moving air conveyor at ground level that circulates the air to feed the whirlpool. This characteristic is formed by the low pressure of the tornado interacting with the ground and is only a few meters deep. But even structures that dodge the tornado can be victims of its powerful winds. As Pagel's camera swings to the east, a lighter sky appears to the right (south) of the image. Strange as it may seem, tornadoes are frequently accompanied by sunshine within a minute or two of their passage. This is because they are forming in the region of the ascending ones at the back of the storm. The rain does not fall there and the dry air that envelops itself from the altitude erodes most of the clouds behind the funnel. Another additional cloud – perhaps another developing storm – is emerging in the northeast, near Delavan, Illinois. The tornado eventually lost much of its speed, the main storm flying over the connection to the surface behind. A brief but wild scene.

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