Global wind patterns are now so flukey, spots that were once reliably blowy can be dead calm these days.
Times, Sunday Times
It was dead calm and indescribably beautiful.
Times, Sunday Times
This huge double-sided painting - a storm-tossed schooner on one face, a dead calm sea on the other - swings like a jib sail on a supporting mast.
Times, Sunday Times
Even on a dead calm day all three factors will still apply.
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