Note: #5 Epoxy MUST be used for TargetÂ® Stair Tread installations Note: For Tread nosing, see #10 Epoxy Stair Nosing Caulk below DIRECTIONS: 1  Be sure the substrate is clean, dry and smooth. 2  Stair Treads and Risers should be pre-cut side to side and front to back before spreading any adhesive. 3  Pour equal amounts of part âBâ into part âAâ and mix ...
Tornadoes often develop from a class of thunderstorms known as supercells. Supercells contain mesocyclones, an area of organized rotation a few miles up in the atmosphere, usually 1â6 miles (2â10 km) across. Most intense tornadoes (EF3 to EF5 on the Enhanced Fujita Scale) develop from supercells.
This creates weather systems in both large regular systems of heat exchange and smaller systems where hot and cold air masses mix, producing chaotic processes difficult to predict with any accuracy. It is these latter, smaller systems which create tornadoes. A tornado occurs where hot and cold air masses mix. The hot, high-pressure air is attempting to rise. The cold, low-pressure air is attempting to sink. As these air masses pass each other, they form a vortex, a swirling maelstrom of air. If there is enough heat to drive this engine, this vortex can become temporarily stable -- a tornado. So long as there is heat to keep it going, the tornado will keep growing stronger until, eventually, the air masses have mixed sufficiently for the heat to dissipate.