After photographing the fleeting moment I nipped back indoors for a top-up went back outside to get the terriers in for their breakfast, or rather I got in the way of them coming in for their breakfast, looked up and it's gone. Dawn had disappeared. Gone.
A bank of fog had rolled in across the fields and had pretty well smothered dawn. Then the fog got thicker and thicker and she disappeared into the murk.
Fortunately she was back this morning.