I thought I should share an experience I had, as relates to signs that come from God.
One night during the work-week, I had a dream where I saw a battle in the southwestern US. It was pretty intense, and I woke wondering whether it was from the Lord. It wasn't particularly lucid or coherent, yet it got my attention. It felt like end-times stuff.
It kept bugging me on my walk to work, so I figured I would pray to the Lord, and ask if it was from Him. The moment after I prayed, a dried-up spherically-shaped weed blew into my path, and bounced along in front of me for a moment until I walked by. Then, I heard His still small voice, along with a peace that came over me. He told me the dream was just the churning of my mind, in the night, then reminded me of an end-times TV series I'd watched a couple months prior. That clicked, and made sense.
Now, with respect to the tumbleweed, I should say... I live in Iowa City, IA. Tumbleweeds blown by the wind are a rare sight, here. Yet look: if I had interpreted either the dream or the tumbleweed apart from the still, small voice... I would conclude both confirm terrifying things!
With the still, small voice--with the help of the Holy Spirit--I knew the tumbleweed showed up as a sort of "I hear you" affirmation. :-)