Tomato patch after a long hot day

Today was hot.  This picture was taken in the evening after the sun went behind some trees.  The tomatoes look OK.  Notice how big that debris clump is getting.  I’ll have to weigh it this week.  I estimate less than 5lb/sqft dry and maybe 10lb/sqft wet.  This kind of dead weight should be OK on the roof in the center without any structural reinforcements.