Fourth Vial

 And the fourth angel poured out his vial upon the sun; and power was given unto him to scorch men with fire. 9 And men were scorched with great heat, and blasphemed the name of God, which hath power over these plagues: and they repented not to give him glory. Rev 16:8-9 (KJV)

Remember the water you should have harvested? Yup. You need it now also!

Get underground. I can't think of too many other ways to survive this. If you're paying attention, by now you're at Petra. If you couldn't make it by now, that dig out shelter I recommended... you need it now.

Getting underground gets you cooler. Dwelling in a cave is even better, but hey... it's just not something you find in every town and city is a nice, cool cave.

You should not go outside at all during this.