The thunderstorms that do rotate, called supercells, are the ones that usually produce tornadoes. Thunderstorms also produce rain and sometimes hail, which frequently accompany tornadoes but is not caused by them.Thunderstorms usually occur as part of a larger storm system, but not always.A hurricane is a tropical cyclone with sustained winds of at least 74 mph (119 km/h).he thunderstorms that do rotate, called supercells, are the ones that usually produce tornadoes. Thunderstorms also produce rain and sometimes hail, which frequently accompany tornadoes but is not caused by them.
Integrated Access Device-IAD. A device that converts multiple types of input signals into a common communications format. IADs are commonly used in PBX systems to integrate different types of telephone devices (e.g. analog phone, digital phone and fax) onto a common digital medium (e.g. T1 or E1 line).
TDD is an abbreviation for telecommunications device for the deaf. It is an electronic device that was invented to make it easier for people who have hearing or speaking disabilities. In some instances, the TDD is also referred to as TTY, which can stand for typewriter or teletypewriter. Description The modern-day TDD is designed as a sort of mini-computer, consisting of a keyboard and an LED or LCD screen to display the electronic text being typed.