[Part 1 of 6] Strong convective gust fronts in the sunrise hour can yield spectacular shelf clouds, as they force lift of boundary-layer air that is optimally stabilized by a nighttime of cooling. This can yield some wild and weird visual effects, especially in the “blue hour” of early twilight. With trees blocking the view of the horizon, and of the underside of the arcus, the cloud formation appeared to slope right out of the Earth itself. This marvelous sequence in first light followed a glorious sunset the evening before. [Go to Part 2]
Norman OK (30 Jul 20) Looking NWShelfie Six Pack: Blue-Hour Appearance
[Part 1 of 6] Strong convective gust fronts in the sunrise hour can yield spectacular shelf clouds, as they force lift of boundary-layer air that is optimally stabilized by a nighttime of cooling. This can yield some wild and weird visual effects, especially in the “blue hour” of early twilight. With trees blocking the view of the horizon, and of the underside of the arcus, the cloud formation appeared to slope right out of the Earth itself. This marvelous sequence in first light followed a glorious sunset the evening before. [Go to Part 2]
Norman OK (30 Jul 20) Looking NW