Bit like the fog story.
Blue day, 96 million miles viz, cold. Assembled white faced studes and brown faced staff in met brief on 228 OCU about 1969.
Enter Metman, overcoat, scarf, boots, hat etc. "No flying today," announces the man to stunned silence.
"Que?"
"It's snowing. 6 inches by lunchtime."
Queue staff and studes look out of window to see snow lashing down is sheets.
"How did you know that would happen?"
"Easy, looked out the door as I left met."
Who says Met never looked outside?