That long black cloud is coming down

Busy day as usual. Hard run, tried to do some speed work (4*1000) but it was too hot - around 29 I think, so gave up after the 2nd one, but still had to run the 8k or so to get back.
Wandered down to the lake this evening to take a pic of this amazing cloud formation. Not really black clouds but this lyric popped into my head and it might well storm, so...