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).
This diagram shows that three types of communication devices (telephone, television, and computer) can share one data line (e.g. DSL or Cable Modem) through an IAD. The IAD coordinates the logical channel assignment for device and provides the necessary conversion (interface) between the data signal and the device.