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Fog could be nixed and mixed by Wednesday By Staff report Jan 28, 2019 02:26 PM A A The fog was a pretty bad last weekend. When is this stagnant air supposed to depart? — No name given It was bad. No doubt about that. For context’s sake, we contacted the National Weather Service to ask about how the fog affected visibility Sunday morning. Meteorologist Brad Schaaf told us the agency measures fog’s impact on visibility down to one-quarter of a mile. Anything worse than that is considered “dense.” And on Sunday, parts of the Rogue Valley — including Medford — definitely had dense fog to tangle with, prompting the Weather Service to issue a dense fog advisory, which expired by the late morning. “That’s not to say it wasn’t still foggy, but it was no longer under a quarter of a mile,” Schaaf said. An area of low pressure is off the Oregon Coast, and weather officials say it should travel south toward the Northern California coast Wednesday. “We’ll get some slight rain chances west of the Cascades with some mountain snow, but this will also improve mixing, which will end the air stagnation and air quality,” Schaaf said. Until then, drivers should continue to exercise caution. In addition to the reduced visibility, the fog can result in icy roads. Drivers need to use their low beams and slow down. Residents should also be sure to check daily wood-burning advisories, either by viewing https://jacksoncountyor.org/hhs/Environmental-Public-Health/Wood-Stove-and-Open-Burning/Wood-Burning-Advisory online, or by calling 541-776-7007. Send questions to “Since You Asked,” Mail Tribune Newsroom, P.O. Box 1108, Medford, OR 97501; by fax to 541-776-4376; or by email to [email protected]. We’re sorry, but the volume of questions received prevents us from answering all of them.