Graphic of temperatures from atmospheric sounding at Whitehorse and the derived contrail layer(s). This infomation is updated at 06:00 and 18:00 Alaskan Standard (Daylight) Time. Last update: Friday August 21, 2009 13:39 AKDT.
Station identifier: YXY
number: 71964
latitude: 60.70º N
longitude: 135.06º W
elevation: 704 m a.s.l.

Contrail Layer
Lower Level
Upper Level
Layer 1

Temperature (T), dew-point and the derived critical temperature (Tcrit, red line). Contrails are likely to be formed at levels, where Tcrit > T. The critical temperatures are calculated using a standard contrail factor CF=0.037 g/kgK. The sounding altitude is shown in the ordinate as meters above sea level.