High temp's will reach mid 90s Thursday; low 90s Friday. Air will not feel cool until after midnight. Weather may increase health-related problems such as sunstroke, heat exhaustion and heat cramps. Do not leave pets or children unattended in vehicles. Hydrate yourself, plants and pets.

According to the National Weather Service in Seattle:

...HEAT ADVISORY IN EFFECT FOR THE SOUTHWEST INTERIOR AND THE HOOD
CANAL AREA UNTIL 9 p.m. PDT FRIDAY...

THE NATIONAL WEATHER SERVICE IN SEATTLE HAS ISSUED A HEAT
ADVISORY FOR THE SOUTHWEST INTERIOR AND THE HOOD CANAL AREA...WHICH
IS IN EFFECT UNTIL 9 p.m. PDT FRIDAY.

* DAYTIME TEMPERATURES: HIGHS WILL BE IN THE LOWER TO MID 90s FOR
  MUCH OF THE AREA TODAY...AND IN THE UPPER 80s AND LOWER 90s ON
  FRIDAY.

* NIGHT-TIME TEMPERATURES: MINIMUM TEMPERATURES WILL COOL OFF TO
  THE MID TO UPPER 50s TONIGHT PROVIDING SOME RELIEF FROM THE
  HEAT...BUT THIS WILL NOT OCCUR UNTIL SEVERAL HOURS AFTER
  MIDNIGHT. NOTICEABLE COOLING WILL NOT OCCUR UNTIL AFTER SUNSET
  WHICH IS STILL AROUND 9 p.m. TONIGHT...AND EVEN THEN IT CAN TAKE A
  FEW HOURS FOR SIGNIFICANT COOLING TO OCCUR. LOCATIONS ON HILL
  SIDES AND HILL TOPS WILL NOT COOL OFF AS MUCH AND MINIMUM
  TEMPERATURES MAY ONLY REACH THE LOWER 60S.

* IMPACTS: THE ELDERLY...SMALL CHILDREN...AND PEOPLE WHO WORK
  OUTSIDE ARE ESPECIALLY VULNERABLE TO THE EFFECTS OF HEAT. HEAT
  EXHAUSTION OR HEAT STROKE ARE POSSIBLE IF PROPER PRECAUTIONS
  ARE NOT TAKEN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A HEAT ADVISORY MEANS THAT A PERIOD OF HOT TEMPERATURES IS
EXPECTED. THE COMBINATION OF HOT TEMPERATURES AND HIGH HUMIDITY
WILL COMBINE TO CREATE A SITUATION IN WHICH HEAT ILLNESSES ARE
POSSIBLE. DRINK PLENTY OF FLUIDS...STAY IN AN AIR-CONDITIONED
ROOM...STAY OUT OF THE SUN...AND CHECK UP ON RELATIVES AND
NEIGHBORS.