OKLAHOMA CITY, Ok. - Wednesday may be the last mild day across Oklahoma for a while.

The National Weather Service says temperatures should be above average before a storm system arrives. A winter storm watch has been issued for Thursday and Friday, when Oklahoma could get a mixture of rain, freezing rain, sleet and heavy snow.

On Tuesday, skies were clear and temperatures ranged from 45 degrees in Ponca City to 55 degrees in Lawton. The high temperature in Stillwater and Tulsa was 48, and the mercury peaked at 49 degrees in Guthrie and Oklahoma City.

Rain chances will be slight initially, then a mixture of rain, snow and sleet is possible for northwest Oklahoma on Wednesday.

Highs in the 50s and lows ranging from 20s in the Oklahoma Panhandle to 40s in the southeast are expected.