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.
When a tornado does form, it's strength is measured using a scale known as the Enhanced Fujita (EF) scale. 1  This scale estimates wind speed by taking into consideration the type of structure that was damaged and the degree of damage to it. The scale is as follows: 2  EF0: 65-85 mph winds. 3  EF1: 86-110 mph winds. 4  EF2: 111-135 mph winds.