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A Period of Hot Weather and Possible Decreased Air Quality
Appears Increasingly Likely For through
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A period of hot weather is becoming increasingly likely through in Western Washington. Record high temperatures are possible in Seattle on all three days, and temperatures at night will only cool into the 60s. There is the potential that maximum temperatures will be higher than currently forecast across the region.
None at this time.
Offshore flow will strengthen as high pressure develops over British Columbia. Air compressing as it comes down off of the Cascades and Olympics will gradually heat the air mass up starting early and continuing through early in the weekend. Temperatures on the coast and away from the water will likely peak , while temperatures in the interior lowlands will likely peak . Temperatures in the interior will likely only cool a couple of degrees from hot values. Hot temperatures will be accompanied by low relative humidity and breezy conditions -contributing to increased fire danger. Air quality may degrade somewhat and as a thermal trough moves into the interior lowlands and reduces circulation.
Seattle Bellingham Olympia
Day Hi/Lo/Rec/Yr Hi/Lo/Rec/Yr Hi/Lo/Rec/Yr
88/60/88/1991 87/56/86/1965 90/54/94/1981
91/62/89/2015 86/58/84/1950 93/56/94/1961
89/63/87/1966 81/59/83/1958 88/56/92/1982
A prolonged period of warm to hot weather across the region will mainly impact people in urban areas who are in poor health. People living in high rise buildings without air conditioning will be most impacted. Any fires that start could grow rapidly in the hot, dry and breezy conditions. A decrease in air quality and could affect unhealthy individuals. At this time, impacts are expected to be moderate.
Confidence is high that a period of hot weather will develop and will persist into . Confidence is moderate that hot temperatures will persist in the interior into .
Confidence is moderate that the combination of hot temperatures, low relative humidity, and breezy conditions could contribute to a high fire danger across much of Western Washington.
Confidence is moderate that air quality will degrade somewhat starting and perhaps persist or worsen or .
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Web Site: http://www.weather.gov/seattle
National Weather Service, Seattle WA