One of the most troublesome aspects of the winter storm that will affect the Ohio Valley late this weekend is how long the precipitation will last. On the satellite imagery this morning, we can see one swirl in the clouds over Oklahoma. This is the system that will bring a chance for light rain or snow to the area tonight. Farther west, we see two features that will get our precipitation underway late Saturday night or Sunday, as they are just moving across central California and the Las Vegas area. But the main upper low, which looks a bit like a cinnamon roll, is still 500 miles off the California coast! Once the main low moves ashore, our forecasts should start to get a better handle on how long this winter storm will last.