Seattle’s Hottest Day on Record: A Look Back at the Heatwave
The hottest day ever recorded in Seattle occurred on June 28, 2021, when the temperature soared to a record-breaking 108°F (42.2°C). This unprecedented heatwave shattered previous records and brought extreme conditions to a region known for its moderate climate. The event highlighted the increasing impact of climate change and the need for preparedness in the face of extreme weather events.
The Record-Breaking Temperature
Before June 2021, Seattle’s all-time high was 103°F (39.4°C), recorded on July 29, 2009. The June 28, 2021 temperature not only surpassed this record but obliterated it by a staggering 5 degrees. This unprecedented heat was part of a larger heat dome that settled over the Pacific Northwest, impacting not just Seattle, but also cities across Washington, Oregon, and British Columbia.
The Heat Dome Explained
A “heat dome” is a weather phenomenon where high-pressure systems trap warm air over a region. The air sinks, further warming it, and clear skies allow for increased solar radiation, exacerbating the heat. In June 2021, the heat dome was particularly strong and persistent, resulting in unusually high temperatures for an extended period. More on 2021 Western North America heat wave can be found on Wikipedia.
Impact on Seattle
The extreme heat had a significant impact on Seattle and its residents. Cooling centers were opened to provide relief to those without air conditioning. Hospitals saw a surge in patients suffering from heatstroke and other heat-related illnesses. Infrastructure was also affected, with roads buckling and power outages occurring in some areas. The heat also strained the region’s electrical grid due to increased demand for air conditioning.
Preparing for Future Heatwaves
The 2021 heatwave served as a wake-up call for Seattle and the Pacific Northwest. It highlighted the need for better preparedness measures, including increased cooling infrastructure, public awareness campaigns about heat safety, and strategies to mitigate the urban heat island effect. Future planning needs to incorporate climate change projections and adapt infrastructure and policies to withstand more frequent and intense heat events.
Frequently Asked Questions
What is a heatwave?
A heatwave is a prolonged period of abnormally hot weather.
What caused the 2021 Seattle heatwave?
The 2021 Seattle heatwave was caused by a strong heat dome that trapped warm air over the Pacific Northwest.
How can I stay safe during a heatwave?
Stay indoors in air conditioning, drink plenty of water, and avoid strenuous activities during the hottest parts of the day.
Are heatwaves becoming more common?
Yes, due to climate change, heatwaves are becoming more frequent and intense in many parts of the world.
What is the urban heat island effect?
The urban heat island effect is when urban areas are significantly warmer than their surrounding rural areas due to human activities.
Summary
The record-breaking heat of June 28, 2021, in Seattle serves as a stark reminder of the impacts of climate change. The extreme temperatures highlighted the need for increased preparedness and mitigation strategies to protect public health and infrastructure in the face of more frequent and intense heatwaves in the future. By understanding the causes and impacts of these events, we can work towards building more resilient communities.
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