As we warned you on Monday, an Arctic cold front has invaded the Pacific Northwest, bringing record cold temperatures in the teens to Oregon. For one particularly chilly example, Pleasant Hill Nursery near Eugene reported a temperature of 11 degrees this morning. Forecasters say this cold snap will continue until Friday, when warm, moist air will arrive from the Pacific Ocean. The collision between the moist ocean air and the dry Arctic low could result in snow or freezing rain Friday and/or Saturday in various locales, but temperatures will quickly warm to above freezing and any precipitation is likely to melt. Nonetheless, nurseries are urged to keep monitoring the weather at their individual location, and protect their plants and structures accordingly.