Graphic of temperatures from atmospheric sounding at Barrow 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 13:37 AKDT.
				Station identifier: PABR number: 70026 Contrail Layer Lower Level Upper Level Layer 1 8722.42 10952.3
			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.