On May 12, my wife and I noticed, in a heavily clouded sky, a large, very black area to the north/northeast. We couldn’t see the cloud itself, only its effect.
The wind was a light south/southwest. By rotating to our right 30 degrees and watching the left-to-right cloud movement overhead, we knew conditions were deteriorating. (We were on land, but had we been at sea our rotation would’ve been 15 degrees to the right.)
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