Ice Patterns

I am returning to a previous theme - patterns forming in the ice on the drive where water runs over the concrete.

I am intrigued by the fact that the shapes made in the ice are often triangles..

This last photo appears to contradict the triangle pattern but in fact the circles are air bubbles under the ice which were slowly moving.

We have had unusual weather today.  Snow still on the ground but much warmer air, creating fog sitting close to the ground over the snowy areas.  

Tonight it is pouring with rain but there is a 'Winter Storm Advisory' in place from midnight until Thursday evening as the temperature falls overnight and the wind from the north brings snow.. maybe the last of the winter?

In anticipation of bad weather and difficult travelling conditions Fairfax County have closed all schools and David's office is shut for a 'Snow day'...