Overnight, the model runs shifted. GFS and NAM models came into agreement. The original runs said a rain event for OKC Sunday & Monday. Then the 6 am model runs came in. They have shifted to more of a wintry mix scenario for the I-44 corridor from Wichita Falls to OKC to Tulsa. Sometime Monday mid to late morning, a transition to rain will take place.
Stay tuned to this blog, my Twitter and Facebook for the latest. Here is more on this from a special weather statement from the Norman NWS office.
… Widespread wintry mix expected Sunday through early Monday…
Very cold air, which will spread over Oklahoma and western North
Texas early this weekend, will lead to a chance of ice and snow
when a storm system arrives late this weekend. Beginning late Sunday and continuing through Monday, this storm system will pull relatively warm and moist air up over the cold air entrenched at the surface. Although this process will help modify and erode the colder
air, the atmosphere will warm fastest aloft. This will lead to a
mixture of snow, sleet, and freezing rain over much of Oklahoma and western North Texas.
Precipitation is expected to begin as early as Sunday afternoon
across western North Texas and western Oklahoma, and then spread northeast. It currently appears that precipitation will start as snow, then transition to a mixture of sleet and freezing rain Sunday night, before switching to rain on Monday. The greatest chance of accumulating snow is forecast over far western Oklahoma, and adjacent parts of North Texas, and also over far northern Oklahoma. The greatest chance of sleet and snow will occur fromnear Wichita Falls up through Oklahoma City. The greatest chance for freezing rain will be over south-central and southeast Oklahoma.
Current numerical model forecasts suggest that accumulations will be
relatively light and should not cause significant disruptions to
travel or power supplies. However, with it being quite cold initially on Sunday and Sunday night, it will not take much precipitation to create slick and hazardous bridges, overpasses, and sidewalks.
You should check NOAA Weather Radio, or your favorite internetand TV sources for the latest information on the upcoming winter weather.