While the major winter storms get all the publicity, very light wintry precipitation can be enough to wreak havac for travelers. In fact, less than 1/100th of an inch of freezing rain can be enough to bring traffic to a standstill. Let's look a few cases where light wintry precipitation caused major impacts:
January 2nd, 2012:
Photo from Patrick Reddy, The Cincinnati Enquirer
The reason this light snowfall event had such a major impact was due to the fact that temperatures fell rapidly below freezing during the snow showers. So, while the snow initially melted on contact with the pavement, it then quickly refroze as the temperatures plummeted, creating a layer of black ice.
December 9th, 2011:
Photo from WYMT
Tips for Keeping Your "Situational Awareness" No Matter What Kind of Weather Winter Brings
Make it a practice to check your favorite websites, news media, NOAA All-Hazards Weather Radio and/or your local National Weather Service's website for the latest forecast information before you head out the door.
Take a quick look at the temperatures where you will be traveling. One great resource for this information is the Kentucky Mesonet. If you see temperatures within 3 or 4 degrees of freezing in the area you will be traveling, change your driving habits and be aware that you could encounter black ice. Be especially careful on bridges, overpasses, and when driving on roads that are heavily shaded during the daylight hours. These areas can freeze before the rest of the road.
Finally, an excellent resource for information on road conditions across the Commonwealth can be found by dialing 511 or by visiting the Kentucky Transportation Cabinet's website for road conditions at http://511.ky.gov/.