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Record breaking heat begins today, hottest days Thursday and Friday

SEATTLE -- A rare heat event begins today as Western Washington braces for several days of temperatures above 90 degrees Fahrenheit.

An excessive heat warning starts Tuesday at 2 p.m. and goes through Friday at 9 p.m.

Thursday and Friday are expected to be the hottest days in the heat wave. Q13 News Chief Meteorologist Walter Kelley says some cities on Thursday could top 100 degrees; the hottest day for Western Washington since July 29, 2009.

"As long as weather records have been kept in Western Washington, there are no marks as high as we expect this week," Q13 News Meteorologist Rebecca Stevenson said on Tuesday's Facebook Live.

She also explained how the rare Pacific Northwest heat wave came about. "A hot air-mass, under high pressure, with an east wind, are the key features to maximize the sun's radiation 3 to 4 days in a row."

Dates Forecast Records
Tuesday 89/66 92 in 2015
Wednesday 94/68 89 in 2009
Thursday 100/67 90 in 1988
Friday 98/65 95 in 1993
Saturday 90/61 93 in 2012
Sunday 87/60 91 in 1972

Overnight low temperatures

A big concern from this week's excessive heat is overnight low temperatures. Stevenson says the night-time lows will not cool very much allowing heat to build up inside homes and apartments over time.

"Thursday through Saturday, morning the lows will be near 72 degrees," Kelley said.

Kelley said along with setting record high temperatures we may also set records for our low temperatures being too warm.

Tuesday's forecast

Record high temperatures are anticipated on the coast today.  Hoquiam is forecast at 83° with the standing record at 78° set in 1993.  Quillayute may tie its record of 82° set in 2015.

Inland temperatures will climb to record levels Wednesday through Friday.

  • Wednesday: hotter. Highs in the mid 90s. Lows in the mid to upper 60s.
  • Thursday & Friday: The hottest days of the stretch, sunny. Highs mid 90s up to 105° possible in the central and south sound, foothills and Kitsap Peninsula.  Overnight lows near 70°.  The coast will be cooling with area low clouds.
  • Saturday: Cooler marine air will begin to intrude inland. Areas of low clouds in the morning may reach into the south sound near I-5. Highs in the upper 80s near 90°, Lows in the mid 60s
  • Sunday & Monday: Areas of morning clouds will clear quickly to sunny skies. Highs low to mid 80s. Lows in the mid to upper 50s.