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More sub-freezing temperatures and frost are in this week’s forecast for Sonoma County. A storm that’s been bringing periods of rainfall since Saturday is expected to continue into early this afternoon. The mercury in thermometers could drop below 32-degrees tomorrow and Thursday mornings, with the valley areas like Santa Rosa getting as cold as 26-degrees. The National Weather Service says frost is possible on both mornings. Another storm is expected to bring significant rainfall between Thursday night and early Friday afternoon.