From the National Weather Service:

* WHAT…Dangerously hot conditions. High temperatures in the 90s

  to near 100 Friday, 97 to 107 Saturday, 100 to 112 Sunday

  through Tuesday. Mild overnight lows in the mid 60s to mid 70s.

* WHERE…Portions of Central, East Central, North Central,

  Northeast and Southeast Washington and North and North Central

  Idaho.

* WHEN…From Friday afternoon through Tuesday evening.

* IMPACTS…Extreme heat will significantly increase the potential

  for heat related illnesses, particularly for those working or

  participating in outdoor activities.

During this heatwave watch for signs of heat stroke, drink lots of water, and take frequent breaks.
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Remember our animal friends also need extra care in the heat. 
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Images courtesy of the National Weather Service