On Friday at 1:43 a.m. the National Weather Service issued a frost advisory valid for Sunday between midnight and 8 a.m. for North Oregon Coast Range Lowlands, Central Oregon Coast Range Lowlands, North Oregon Coast Range, Central Oregon Coast Range, Lower Columbia River, Tualatin Valley, West Hills and Chehalem Mountains, Outer Southeast Portland Metro, West Central Willamette Valley, East Central Willamette Valley, Benton County Lowlands, Linn County Lowlands, Lane County Lowlands, West Columbia River Gorge of Oregon above 500 ft, Clackamas County Cascade Foothills, Cascade Foothills of Marion and Linn counties and Lane County Cascade Foothills.
The weather service states to expect, “Temperatures as low as 32 to 36 degrees will result in frost formation.”
“Frost could harm sensitive outdoor vegetation. Very sensitive outdoor plants may be killed if left uncovered,” explains the weather service. “Take steps now to protect tender outdoor plants from the cold. Consider temporarily moving outdoor potted plants indoors if they are sensitive to cold temperatures. Consider temporarily covering sensitive plants with a lightweight cotton fabric (i.e., bedsheets, thin blankets), as this will help retain heat and provide frost protection for your plants.”
Frost advisory – this is what it means
Frost advisories are issued from May to October (but can be extended if necessary) when temperatures, winds, and sky cover are favorable for frost development. This is most likely to happen when the temperature is 36 degrees or less. In some cases, the frost is severe enough to end the growing season and is then referred to as a ‘killing frost’.
According to the weather service, if a frost advisory is issued for your area, cover up sensitive plants before the sun sets so that it can help retain heat near the plants, or move the plants indoors for the night, if possible.
Advance Local Weather Alerts is a service provided by United Robots, which uses machine learning to compile the latest data from the National Weather Service.