wads of wool roving

wads of wool roving

undulate across the sky

in voluptuous waves

Late March, for a breathtaking half hour the entire dome of the sky is covered with billowing blue-gray clouds rising and falling in waves. Altostratus undulatus form when the air above and below the cloud layer is moving at different speeds and directions, pulling, twisting and shearing the clouds into intricate, fast-changing patterns. Sometimes it looks as if the waves crest over the tops of trees, but this ocean of clouds is too high to be affected by mere landlubbers.