We'll start with a broken cloud deck but increasing clouds and cold air will be the call today with highs in the lower to mid 40s. A slight chance of showers or snow showers will be possible this evening but no accumulation is expected.
A fast moving upper level system is bringing cloud cover to the region this morning and may bring a few snow showers to the region later tonight. This system is rather weak, but will continue to lift the atmosphere as it moves closer to the state this afternoon. Massively dry air will remain in place which will inhibit the precipitation process for many hours. But as the light shower activity approaches this afternoon it will cool the atmosphere allowing temperatures to drop and humidity values to increase. This cooling process may eventually allow some showers or snow showers to fall to the surface before evaporating resulting in some very light precipitation if any at all. The temperatures may top out in the lower 40s today before the cooling process begins and the better timing for some of these snow showers should be after sunset tonight.
After this system moves eastward before dawn tomorrow, we're in store for a relative warm up through Friday before another major blasts rolls over the region Saturday with more cold air Sunday into early next week.
The data suggest some light rain will be likely Saturday across eastern OK with some wrap around showers possible Sunday morning as the cold air moves into the region. This race between the cold air and any remaining precipitation will be the forecasting issue for the next several days. The timing of the cold air and the departure of the precipitation will be very close together resulting in another chance for some wintry precipitation late Saturday evening through pre-dawn Sunday. Several notable differences remain between the GFS and EURO data which leads me to remain steady with our current forecast. This means only a slight chance of showers Saturday and colder air Saturday evening through early next week.