Arctic Outbreak Forecast      Issued:   10:30 AM Tuesday November 27, 2001   Arctic Air Invading the Deep South  Blizzard in the Northern Plains - Winter Precipitation in Texas    Arctic air continues to push southward down the Plains states all the way into central Texas this morning. Blizzard conditions continue from northern Wisconsin across much of Minnesota and the eastern Dakotas and eastern Nebraska this morning. Farther south, light snow has begun falling in north Texas and western Oklahoma.   The storm center in southern Minnesota is forecast to move slowly eastward and weaken over the next 24-48 hours, spreading heavy snow across the Great Lakes. Blizzard conditions from the Dakotas east through Minnesota will begin to slowly subside by Wednesday as the low moves eastward. Most of the Ohio Valley will remain above freezing to the south of this storm center, so all precipitation there should fall in the form of heavy rain.   The second problem area is the deep south. Cold, Arctic air has now reached central Texas. As the cold air continues to funnel southward through Texas, a strong upper-level disturbance will move across the state tonight and on Wednesday. This will result in the development of a low center near the upper Texas coast. A band of moderate snowfall is forecast from the central Texas Hill Country to just west of the Dallas/Fort Worth area, eastern Oklahoma, and northwestern Arkansas on Wednesday. Snowfall accumulations may reach 2-3 inches in central Texas and 3-6 inches in western and northwestern Arkansas on Wednesday.   There will be a very narrow band of mixed precipitation extending from central Arkansas southwest through the Dallas/Fort Worth Metroplex to between Waco and College Station, TX on Wednesday and Wednesday night. With temperatures hovering near freezing and a very warm ground, we do not expect much in the way of accumulations except for elevated surfaces like trees, power lines, and bridges. Accumulations of ice in this narrow band may reach 1/4 inch - particularly Wednesday late afternoon and evening.   By Thursday morning, the low is forecast to be accelerating northward through the Tennessee Valley toward western Ohio. A band of heavy snow will extend from northwest Arkansas through central Missouri to northern Illinois and southern Wisconsin west of the low center. A ccumulations of 3-6 inches can be expected. East of the low, heavy rain will spread across the southeastern U.S. northward through the central Ohio Valley.   Beyond the next 48 hours, we can see no evidence of any major Arctic air intrusion into the lower 48 states. High pressure will be building across northern and central Canada through the first week of December and into the second week of December. We certainly would not be surprised if the next significant Arctic air intrusion were to occur during the third week of December.   Chris Hebert