Excessive Heat Watch Memorial Day through Wednesday.

...EXCESSIVE HEAT WATCH IN EFFECT FROM TUESDAY MORNING THROUGH
WEDNESDAY EVENING...

* WHAT...Dangerously hot conditions with temperatures between 100
  up to 109 degrees possible.

* WHERE...Valleys in western Siskiyou County, including the Seiad
  and Scott Valley, as well as the Shasta Valley. This includes
  Mt. Shasta City, McCloud, Dunsmuir, Yreka, Montague, Grenada
  Fort Jones, Hilt, and Happy Camp.

* WHEN...Late Tuesday morning through Wednesday evening.

* IMPACTS...Extreme heat will significantly increase the potential
  for heat related illnesses, particularly for those working or
  participating in outdoor activities.

* View the hazard area in detail at
  https://www.wrh.noaa.gov/map/?wfo=mfr