Visa Waiver Program. Allows visitors to the U.S. from certain countries to enter the U.S. using only a passport [the visa requirement waived]. The Visa Waiver Program includes the following 27 countries: Andorra, Austria, Australia, Belgium, Brunei, Denmark, Finland, France, Germany, Iceland, Ireland, Italy, Japan, Liechtenstein, Luxembourg, Monaco, the Netherlands, New Zealand, Norway, Portugal, San Marino, Singapore, Slovenia, Spain, Sweden, Switzerland, and The United Kingdom (for citizens with the unrestricted right of permanent abode in England, Scotland, Wales, Northern Ireland, the Channel Islands, and the Isle of Man). For further information about the Visa Waiver Program, see the U.S. Customs and Border Protection website at http://www.cbp.gov/xp/cgov/travel/leavingarrivinginUS/how_do_i/vwp.xml.

Visa Waiver Program. Allows citizens of certain participating countries, meeting the Visa Waiver Program requirements to enter the United States as visitors for pleasure or business without first getting a visa. Visitors can stay only 90 days and can not extend their stay.

AD ind rofile. A radar plot of horizontal winds, derived from VAD data, as a function of height above a Doppler Radar. The display is plotted with height as the vertical axis and time as the horizontal axis (a so-called time-height display), which then depicts the change in wind with time at various heights. This display is useful for observing local changes in vertical wind shear, such as backing of low-level winds, increases in speed shear, and development or evolution of nearby jet streams (including low-level jets). This product often is referred to erroneously as a VAD.