UPDATE: Mon 22 Feb 2010 / 3:30p.m.
The snowstorm will move south of us; we may get very light accumulations overnight/Tuesday but we're talking maybe a half inch. Major travel problems are not expected since roads are fairly warm from the mild weekend. Many areas may not see any accumulation at all; southern portions of Texoma have best chances of getting a little white on the ground.
500mb (steering winds) map for noon Tuesday 23 Feb 2010 /GFS model: note yellow and orange zone over south and west Texas.