FRIDAY MORNING UPDATE

Here's the latest snowfall prediction map. The trend has been for a colder and snowier event. The surface low looks to track just a hare more to the south which in turn, sends our precipitation over to snow earlier and keeps it around longer too. Parts of NE OK could go over to snow after some light shower activity as early as midnight tonight. Most of our northern region should see a switch from rain to snow in the morning. The River Valley can expect a switch to snow closer to the noon hour tomorrow. The precipitation looks to come to an end by midnight tomorrow. There may be a sharp clearing line with the clouds. Providing this pans out, temperatures will nose-dive into the teens and low 20s by Sunday morning. With temperatures falling through the day tomorrow, any slushy roads will freeze, yielding dangerous driving conditions. We'll be providing many more updates... on-line and on-air. Keep it tuned to 4029 we'll keep you advised!

Last night, especially in the River Valley, pockets of freezing fog developed. Under calm conditions a radiational temperature inversion developed. As the Earth re-radiated heat that it received during the day, cool air settled in close to the surface. With some moisture in place this cool air condensed into a thick fog. Temperatures, though were below freezing. The "fog" which is comprised of liquid water basically froze to anything it settled on like; car roofs and windows, perhaps bridges and overpasses, and tree branches. This type of ice is referred to as rime ice. Sometimes freezing fog is advected (horizontally transported) into an area. In this case rime will form on the side of objects that face into the wind. Check out the picture below.

Posted by Ted Zarras at 10:45 AM