•Midwave water vapor imagery from the GOES-8 sounder at 1146 UTC on 7 October 1994. Progressively less water vapor transparent bands (8, 10, 11, and 12) become more sensitive to middle and upper tropospheric moisture. Dry and moist tongues become obvious in the band 12 (6.7 micrometer) image as one progresses upward through the bands starting with the band 8 (10.8 micrometer) window image. It is interesting to note that band 11 (7.0 micrometer) has a factor of twelve improvement (in higher horizontal resolution and better signal) over the similar GOES-7 water vapor band. Previous slide.