Northern California — including Woodland — is about to turn the page on the wettest January in 20 years, which begs the question: How much rain will February bring? The answer won’t come for another four weeks, but the entire Northern California region is expected to begin February with another storm system which could drop as much as 3 inches of rain, according to the National Weather Service.Rain is expected to move into the region late Wednesday, with the heaviest downpours expected Thursday, according to Bob Benjamin, a forecaster with the weather service.