Well, here is something else you can look for: Snow Spirals! Found this on
www.spaceweather.com - a cool website that has current information about the geomagnetic field, solar flares, etc. This was posted there today, along with a picture of a "Snow Spiral".
"
SNOW SPIRALS: As a winter storm of
historic proportions prepares to sweep across the USA later this week, midwesterners should be alert for some unaccustomed sights. One of them is snow spirals. Michael French photographed this specimen in Frederick, Maryland, on Jan. 29th:
"I call them Karra Spirals, after my wife Karra Strickland who discovered them in our yard," says French. "They were all over town, spiraling down the braided metal guy-wires on telephone poles. Here's the curious thing: The wires were spun clockwise, while the snow formations were spun
anti-clockwise. The hardened snow spirals were rotated opposite of the metal wire's weave. We also noticed that spirals near the top of the wires were longer (~1 meter) than spirals at the bottom (0.1 - 0.3 meters)--perhaps because of gravity?"
Indeed, the changing wavelength of the spiral suggests gravity played a role in their formation. This could be how heavy snow sags under its own weight when it clings to a braided wire. Why the spirals should oppose the braid, however, is not obvious. Readers with explanations are invited to
submit them for consideration."
http://spaceweather.com/