A storm system approaching the Pacific Northwest could bring light freezing rain and sleet to parts of Northwest Oregon and Southwest Washington later Tuesday, according to a National Weather Service alert.

The alert includes the cities of Astoria, Cannon Beach, Jewell, Tillamook, St. Helens, Clatskanie, Portland, Long Beach and Longview, Wash.

The chances for freezing rain aren't too high, the Weather Service says, but a warm front associated with the storm system could bring some precipitation that could fall into a dry and cold air mass and possibly produce freezing rain or sleet.

However, it is more likely that a slightly warmer air mass would produce nothing more than a light rain over the area.

If it stays cold enough for freezing rain, however, in the Columbia River Gorge and upper Hood River Valley, the precipitation would likely begin as snow and then transition to sleet and freezing rain.

Over the northern Willamette Valley -- in Clark County and the lower Columbia region -- precipitation would likely begin as freezing rain and sleet.

Warmer temperatures should end the threat of freezing rain or sleet around midday Wednesday except in the Columbia River Gorge where cold air typically lingers, the Weather Service says.

 

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