Portland Metro, WA-Vancouver Area
*NOAA Issue Date: 1/16/2017 08:36:00 PM Major ice storm likely Tuesday and Wednesday for the Hood river and Wind River valleys ... The Columbia river gorge ... As well as many valleys within the gifford pinchot national forest ... ... Freezing rain expected Tuesday for the greater Portland and Vancouver metro area ... Nearby valleys in the coast range and Cascades ... And the central and south Willamette Valley ... . Temperatures are expected to remain at or below freezing under Valley inversions tonight and Tuesday morning. Meanwhile ... A very moist Pacific frontal system will spread rain across the region Tuesday morning ... Increasing Tuesday afternoon and evening. There will likely be several hours of rain before warm air aloft can work its way down to the Valley floors ... Leading to the potential of several hours of freezing rain. Areas in and near the Columbia gorge will be hardest hit ... As they will be the last to climb above freezing. ... Ice Storm Warning in effect from 4 AM to 10 PM PST Tuesday for the greater Portland and Vancouver metro areas ... The National Weather Service in Portland has upgraded the Freezing Rain Advisory to an Ice Storm Warning ... Which is in effect from 4 AM to 10 PM PST Tuesday. * Timing Light freezing rain is expected to develop early Tuesday morning ... Likely affecting the morning commute. After a lull during the late morning and early afternoon ... Expect heavier precipitation to move in during the late afternoon and evening. This heavier precipitation will likely fall as freezing rain in eastern portions of the metro area. * temperatures ... . At or below freezing through Tuesday morning ... Then slowly climbing above freezing Tuesday afternoon with most areas transitioning to rain. However ... Areas east of interstate 205 May remain below freezing through much of Tuesday night ... Allowing freezing rain to continue for much longer than other portions of the metro area. * Ice accumulation Generally 0.10 to 0.25 inch. However areas east of i-205 May see 0.25 to 0.5 inch ... With localized amounts of 0.5 to 1 inch in areas closer to the Gorge. * Impacts Many roads remain snow and ice covered from last weeks snowstorm. It may take a couple hours of temperatures above freezing to completely end the freezing rain threat at any given location. Roads may again become difficult for travel across the greater Portland and Vancouver metro area Tuesday morning. Ice accumulation on trees and Power lines may result in downed branches and lines ... Which would bring the threat of Power outages Tuesday into Tuesday night. Precautionary/preparedness actions... An ice Storm Warning means severe winter weather conditions are expected or occurring. Significant amounts of ice accumulations will make travel dangerous or impossible. Travel is strongly discouraged. Commerce will likely be severely impacted. If you must travel ... Keep an extra flashlight ... Food ... And water in your vehicle in case of an emergency. Ice accumulations and winds will likely lead to snapped Power lines and falling tree branches that add to the danger.