Hold the left mouse button down as you drag the slider above the image (or use the arrow buttons) to fade between the NOAA-12 visible channel and the corresponding NOAA-12 10.8 micrometer IR image at 23:56 UTC on 14 July (5:56 PM MDT). To zoom, click on the "Zoom" button, and then click the "hand" cursor on the image where you want to center the zoom.
Note the appearance of shadowing and texture on the visible image, indicating regions of overshooting thunderstorm tops. On the IR image, an "Enhanced-V" cloud top signature is evident, which often indicates convection that is producing or soon will produce severe weather. The coldest cloud top temperature measured by the NOAA-12 AVHRR instrument was -66 C (compared to -51 C measured by GOES-10 at 22:53 UTC). At the time of this image, the Red Deer (CYQF) region was under a Severe Thunderstorm Watch; a Severe Thunderstorm Warning was issued about 20 minutes later (00:18 UTC, 6:18 PM MDT) for this storm.