* WHAT…Temperatures as low as 33 to 36 will result in frost formation.
* WHERE…Northern and Central Coast Range Valleys and Mountains of Oregon, Lower Columbia River and Cowlitz River Valleys, Portland Metro Hills, Central Willamette Valley, Tualatin Valley, West Columbia River Gorge of Oregon above 500 ft, Clackamas County Cascade Foothills, Willapa Hills, North Clark County Lowlands, and South Washington Cascade Foothills.
* WHEN…From 9 PM Thursday to 10 AM PDT Friday.
* IMPACTS…Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered.
* AFFECTED AREAS: 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 … WEST COLUMBIA RIVER GORGE OF OREGON ABOVE 500 FT … CLACKAMAS COUNTY CASCADE FOOTHILLS … WILLAPA HILLS … COWLITZ COUNTY LOWLANDS … NORTH CLARK COUNTY LOWLANDS … SOUTH WASHINGTON CASCADE FOOTHILLS
Instructions:
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.
Severity: Minor – Minimal to no known threat to life or property
Urgency: Expected – Responsive action SHOULD be taken soon (within next hour)
Certainty: Likely (p > ~50%)
Category: MET: Meteorological (inc. flood)
Event Description: Frost Advisory