There isn’t much moisture, the strongest wind energy aloft will pass north of us, and surface winds blowing from the southwest down the mountain slopes will dry the air further and not be favorable to converge with the approaching cold front. For all those reasons, there isn’t much chance of storms on Saturday. But because there is a cold front moving into what will be some warm air, highs in the upper 70s and low 80s mostly across Southwest Virginia, the storm threat isn’t zero. Precipitation probabilities are running 30 percent or less, according to the National Weather Service in Blacksburg, and the Storm Prediction Center has assigned only a 5 percent chance of severe weather – meaning a 5 percent chance that a severe storm passes within 30 miles of any given point. So most likely, you are not going to see storms at your location tomorrow, but there is just a small chance a given location could see a passing shower or storm as the front moves in. The chances will be a little larger as you go east into the Piedmont, where daytime heating and moisture may be a little more. This front is going to bring in the biggest push of cold air since the spring, with lows by Monday and Tuesday mornings dipping below 40 in many locations west of Roanoke. The frost may be on the pumpkin in a few locations early in the coming week, now officially fall on every calendar, with Saturday’s vernal equinox confirming it on the astronomical charts.