Portlanders joining an Emergency Naked Bike Ride on Sunday should brace themselves for cold and rainy conditions .

National Weather Service forecasters expect a high of just 54 degrees and a 100% chance of rainfall on Sunday. Portland could also see thunderstorms.

The weather service has also issued a winter weather advisory for for the North Oregon Cascades, warning of wet snow above 4,000 feet. The advisory includes the Santiam and Willamette passes and Government Camp. It expires at 11 a.m. Monday.

Sun will shine later this week. Monday rain will clear up for sunny skies on Tuesday and Wednesday with a high temperature in the low 60’s, forecasters say.

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