Low stratus cloud was present over the cool water on the southern and western sides of the Subtropical Convergence east of New Zealand during two airborne infrared radiation thermometer surveys made on 2 April and 17–18 November 1969. The alignment of the northern boundary of such cloud with the Subtropical Convergence, and of cloud boundaries elsewhere with other areas having large horizontal temperature gradients, demonstrates that often such cloud boundaries can be useful indicators of surface temperature discontinuities.