Dangerous Heat and Humidity Building from the Plains to the East Coast

A strengthening ridge of high pressure will produce much above average temperatures from the Plains to the East Coast, a true summer heat wave. Highs in the 90s and triple digits combined w/ humidity and dewpoints surging into the upper 70s, if not low 80s, will create heat indices as high as 110 to 115 through this weekend. Air quality will likely be poor due to haze and little air circulation.
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Last Update: 259 AM PDT Thu Jul 18 2019

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Seattle, WA Local Forecast Office

6NM SW Seattle WA

Marine Zone Forecast


Synopsis: PZZ100-181900- 259 AM PDT Thu Jul 18 2019 .Synopsis for the northern and central Washington coastal and inland waters...Continued onshore flow will allow for small craft advisory level winds again this afternoon and tonight in the strait and adjacent waters. This onshore flow will ease somewhat on Friday. Weak high pressure will build toward the area over the weekend. $$

Today
S wind to 10 kt becoming SW 5 to 15 kt in the afternoon. Wind waves 2 ft or less. A chance of showers in the morning. Showers likely in the afternoon.
Tonight
NW wind 5 to 15 kt becoming SE after midnight. Wind waves 2 ft or less. A chance of showers.
Fri
S wind to 10 kt becoming NE in the afternoon. Wind waves 1 ft or less. A slight chance of showers.
Fri Night
NE wind 5 to 15 kt. Wind waves 2 ft or less.
Sat
N wind to 10 kt rising to 5 to 15 kt in the afternoon. Wind waves 2 ft or less.
Sat Night
N wind 5 to 15 kt becoming to 10 kt after midnight. Wind waves 2 ft or less.
Sun
N wind to 10 kt. Wind waves 1 ft or less.
Mon
Light wind becoming NW to 10 kt. Wind waves 1 ft or less.
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ABOUT THIS FORECAST

Last Update: 259 AM PDT Thu Jul 18 2019
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