You may have heard about California’s Ferguson Fire, which has killed one firefighter and is threatening to spread into Yosemite National Park. But a series of other fires, sparked by lighting to the north, are also raging.

And now, thousands of firefighters struggling to contain the blazes must contend with a heat wave descending on the region.

In the image above, acquired today (Monday, July 23) by NASA’s Terra satellite, look for a thick pall of smoke in the lower right quadrant. Th