It’s the first major sustained hot spell of the year, with the sun bearing down on areas already suffering historically dry and arid conditions.
Larry O’Neill is an associate professor at Oregon State University and the state climatologist. He told KLCC that when these kinds of heatwaves hit in the middle to near end of summer, there can be formations known as “flash droughts.”
“And what a flash drought is, it’s basically a rapid drying of any remaining moisture in the soil and plants, and just the landscape in general,” explained O’Neill. “And so those conditions can lead to a quick intensification of drought conditions. And so we’re monitoring that very closely right now.”
O’Neill says areas most susceptible to flash droughts are the foothills of the Cascades, and then areas of Douglas County, namely Roseburg down into Medford.
The roughly week-long heatwave hitting parts of Oregon could also be one for the record books.
O’Neill says it’s not so much the intensity of the temperatures, as it is the duration that makes these – quote - “very interesting times.”
“The fact that it’s forecast to occur over 5 or 6 days and then gradually taper off…if that forecast holds, this’ll be one of the longest heatwaves in the Pacific Northwest in our historical record…that amount of drying of the landscape over a weeklong period,” said O’Neill.
“So this may be the second consecutive year where we have a historically significant heatwave in the Pacific Northwest, the likes of which we haven’t seen before.”
The heatwave will also worsen drought conditions and increase the risk of human-caused wildfires. People are advised to hydrate and limit the use of fire or machinery that could produce sparks or heat.
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