Warning signs of heat stroke:
Warning signs of heat stroke vary, but include the following:
An extremely high body temperature (above 103 degrees F)
Red, hot and dry skin (no sweating)
Rapid, strong pulse
What to do: Get the person to a shady area, cool rapidly in a tub of cool water, place in a cool shower, spray with cool water from a garden hose or splash with cool water and fan vigorously. Monitor body temperature and continue cooling efforts until the person’s body temperature drops to 101 to 102 degrees F. If emergency medical personnel are delayed, call a hospital emergency room for further instructions.
(Taken directly from http://blog.al.com).