Joe is a pretty dumb teenager in this show. Also wait. Angie is his sister? And he's just now worried about her whereabouts? That was a bit of a WTF moment for me. Especially with no parents around, wouldn't finding and/or staying with his sister be priority number one even if she apparently doesn't live at the family home (which also seems a bit strange but whatever)?
And "maybe the Dome doesn't want us to tell anyone?" Uhh so what? Why would you be on "Team Dome?"