Severe-thunderstorm watch? Meh, let 'em know when it gets to a severe-thunderstorm warning

Those are sweep rowers! Each has only one blade, vs. scullers who have two.

(Don't worry, it's a common mistake that nobody except rowing people will care about.)

Scullers are rowers who use one oar in each hand - two oars per rower. Sweep rowing is when each rower in a shell uses only one larger oar with both hands.

Thanks, Adam!