Showers that started in the western provinces on Sunday will be seen in the central and southern parts of the country as well. Temperatures are predicted to increase by three to five degrees on Tuesday. Intense snowfall is expected in the Uludağ, Bolu and Abant mountains until tonight. A longer and harsher period of cooling will start from Dec. 10 across the nation. Environment and Forestry Minister Veysel Eroğlu said temperatures are expected to fall 0.5-1.0 Celsius degrees below seasonal norms nationwide, with the exception of southeastern Turkey, where harsher winters are normally observed. He also noted that 50 millimeters (1.97 inches) less rainfall is expected in the Mediterranean and Aegean regions in December, January and February. In the meantime, İstanbul residents woke up to a colder morning on Sunday. Temperatures dropped by 10 degrees Celsius overnight as showers were seen in the early hours across the city. The State Meteorological Bureau yesterday warned residents in the western cities of Kocaeli, Sakarya, Bursa, Yalova and Düzce against possible flooding.