The State Weather Service has issued a yellow-coded advisory warning for fog overnight into Tuesday and on Tuesday morning. Visibility is expected to be 200 meters or less, according to the advisory. In parts of the country the fog will remain in place until afternoon. Starting Wednesday, the weather is expected to further warm up, with highs forecasted at around +25. But this won't involve clear skies as well, as the Service predicts rain on extensive areas on Wednesday. Temperatures will drop by several degrees towards the end of the week.