I've seen this little bit of natural dyeing on the sidewalk at the library every year, for many years. I've taken pictures from time to time, but never come up with one as nice. I'm guessing that where the brown is a streak, someone stepped on the wet oak leaf and moved it.
Woollie Bear caterpillars grow black and orange "fur." The black is on both ends, the orange in the middle. The more orange, the milder the winter.
Not looking good.
I've read this winter is forecast to be bitterly cold and the reason is the continuing shift of the polar vortex. The vortex is a band of air that corrals the arctic cold and keeps it where Santa lives, close to the North Pole. Now the vortex is shifting toward Europe, but still has a long way to go across the Atlantic.
Do your Woollie Bears have orange vests over there?