Gordon's cloudspotting guide - Day 1

(With apologies to Gavin Pretor-Pinney).

This is the Lancia Stratos, rallysport icon of the 1970s.

Not to be confused with this, which is stratus cloud.

Today it's grey, really grey. There's grey cloud spanning the vault of the heavens. It's a flat, featureless, low-altitude cloud, with a uniform base, so it's stratus.