Not melting fast enough, I'd say.
Thought it'd be a fine day to go fetch some locust the neighbor had ripped out at the end of a hilltop cornfield. Loaded saws, oil, gas, cant hook and broom in the F150 and took off. Successfully negotiated the mud and slush at the bottom of the hill and the long, steep, rutted, sloppy drive that traverses the side of the hill. Slithered, slid and bounced to the top of the drive and thought I had it made.
WRONG! Kerflumpf into a drift that stretched for a quarter mile on the just-east-of-the-hilltop drive. First time the old Ford had ever been truly stuck....and I forgot to bring a shovel.
Hiked back to an old barn and found a bent and broken shovel in a corner. It was enough. Dug the truck out, got it to the bare crest of the hill, turned around and headed back toward the hillside section of the drive. To get back on the hillside drive, I slid down the hill from the crest in the snow, mostly sideways, until I hit the drive. Kind of a heartstopper but it stayed on the drive and didn't roll. Good old truck.
Kept repeating the bad judgment-experience-good judgment line to myself the whole time. Maybe next time there will be enough experience to support some good judgment for a change.
I can always hope.
Bob