![]() Between Monday night and Tuesday morning this week, NWS counted 1,300 lightning strikes. It’s rare for the Seattle area to get thunder and lightning, because the region’s typically cooler air hinders the moisture needed for storms. Warm days will persist through Friday.Īlong with the hot temperatures comes the potential for thunderstorms. Sea-Tac Airport recorded the peak, a record high of 89 degrees, on Sunday. The summer-like temperatures began to build last week with three days in the 70s followed by two days in the 80s. The long days perpetuate day after day,” he said. “These events tend to lead to heat events because we have more daytime heating from the sun, and that leads to sinking areas and suppresses cloud formations, and so that’s why we have so many days of really sunny skies. “We had a really strong ridge of what we call a ridge of high pressure,” said lead forecaster, Trent Davis, with NWS in Seattle. As air moves down along a curve, it sinks and becomes warmer. In a jet stream, narrow bands of strong wind flow from west to east in an arc-like shape. The heat came with a high-pressure system On the heels of back-to-back summer heatwaves, The Urbanist compiled the following explainer to put this unseasonal weather event into context. ![]() Historically, Seattle’s maritime climate delivered spring weather that was reliably overcast with cool temperatures and rain, earning names like “May Gray” and “June Gloom,” mid-May this year was oddly sunny and alarmingly warm. The increased frequency, duration, and intensity of heatwaves are indicators of climate change – the result of human activities like carbon pollution. That’s how much higher temperatures in Seattle were during a heatwave this week compared to what we usually experience this time of year, according to the National Weather Service (NWS). A string of sunny and warm days perpetuated the hot temperatures in Seattle. Satellite images on Monday show cloud cover over the Pacific Northwest during a heatwave on Monday. ![]()
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