Welke terminologie je ook gebruikt, een reversal maakt daar altijd deel van uit.
"In the past, these phenomena have been arbitrarily defined using a variety of different criteria involving winds, temperatures, and measures of the vortex shape. A major SSW is defined by Andrews et al. (1987, see p. 259) as when “at 10 mb or below the zonal-mean temperature increases pole-ward from 60° latitude and the zonal-mean zonal wind reverses. If the temperature gradient reverses but the circulation does not, it is defined to be a minor warming.” The World Meteorological Organization (WMO) has a slightly different definition, requiring the latitudinal gradient of the 10-hPa zonal-mean temperatures between 60° and 85°N to be positive for more than 5 days. The WMO also uses 65°N, instead of 60°N, as their latitude to reference the wind changes. Other variants on these definitions using polar temperatures, temperature gradients, and wind reversal have also been used (McInturff 1978; Labitzke 1982). In addition to definitions of major and minor SSWs, the WMO also defines a category of SSWs known as Canadian warmings, which occur early in the winter, and final warmings, which mark the transition from winter to summer circulation (see, e.g., Labitzke and van Loon 1999)."
"In the past, these phenomena have been arbitrarily defined using a variety of different criteria involving winds, temperatures, and measures of the vortex shape. A major SSW is defined by Andrews et al. (1987, see p. 259) as when “at 10 mb or below the zonal-mean temperature increases pole-ward from 60° latitude and the zonal-mean zonal wind reverses. If the temperature gradient reverses but the circulation does not, it is defined to be a minor warming.” The World Meteorological Organization (WMO) has a slightly different definition, requiring the latitudinal gradient of the 10-hPa zonal-mean temperatures between 60° and 85°N to be positive for more than 5 days. The WMO also uses 65°N, instead of 60°N, as their latitude to reference the wind changes. Other variants on these definitions using polar temperatures, temperature gradients, and wind reversal have also been used (McInturff 1978; Labitzke 1982). In addition to definitions of major and minor SSWs, the WMO also defines a category of SSWs known as Canadian warmings, which occur early in the winter, and final warmings, which mark the transition from winter to summer circulation (see, e.g., Labitzke and van Loon 1999)."
