BikerDude
Dude
Another reason may be that the spiders thought the ash was insects and expanded their webs to catch all of them or maybe the ash ruined their webs and they made more to replace them. Whatever the reason, they made webs all over the yard.
Actually they might not be spider webs.
There is a phenomenon called "smoke webs".
https://www.researchgate.net/figure/Smoke-webs-and-chains_fig1_291153227
https://www.yelp.com/biz_photos/servpro-of-sw-san-jose-san-jose-2?select=9uJgwXZip7cqh5yixkOpqQ