Oregon Weather Alert: Freezing Fog Expected in Portland Valleys Through Tuesday Morning

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Drivers across Oregon, especially in the Portland area, should prepare for hazardous conditions as freezing fog lingers through Tuesday morning. Reduced visibility and icy roadways, particularly along the I-5 corridor and in valley regions, could make travel dangerous.

According to the National Weather Service, freezing fog forms as cooler air drains into valleys, trapping moisture near the surface. With overnight lows below freezing, this creates a layer of frost on roadways, bridges, and overpasses. Visibility in some areas may drop to less than a quarter-mile, especially before sunrise Tuesday.

Residents should allow extra travel time and drive cautiously on icy roads. Use low-beam headlights and avoid sudden braking to maintain control in low-visibility conditions. The Oregon Department of Transportation is monitoring the I-5 corridor and key highways for slick spots and advises drivers to check road conditions before heading out.

This pattern of valley fog is expected to dissipate by late Tuesday morning as temperatures rise slightly, with daytime highs reaching the mid-40s. The extended forecast predicts a mild warming trend midweek, with partly cloudy skies and highs in the low 50s by Thursday. However, another system may bring light rain over the weekend.

Residents are urged to stay updated on weather advisories and take precautions when traveling, especially during the morning hours. For real-time updates, check the National Weather Service or Oregon Department of Transportation websites.

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