(CNN) — Outdoor concert goers in Las Vegas brave scorching temperatures to see their favorite bands.
But the heat was so extreme; plenty of music lovers weren't prepared for it.
It's one of the most electrifying traveling festival tours where music is king and baselines are mind-blowing.
But few fans were ready for an unexpected guest: Mother Nature’s excessive heat.
“I don't know what happened, I can't remember,” said heat victim Lisa Hunter.
Within an hour of the 19th annual vans warped tour - Lisa Hunter passed out and was rushed to a medical tent.
“I just felt faint, I couldn't see, I couldn't hear and next thing I know, I'm here,” said Hunter.
She flew in from Scotland - where current temps are a chilly 50 degrees.
But Las Vegas natives felt right at home.
To keep the tens of thousands of revelers hydrated - bottled water was free - sprinklers showered guests
Six-shade tents hovered over 10 thousand square feet.
And medics were on nearly every corner.
“We have three first aid stations out here today,” said Keith Jones, Ops Director, Sundance Safety.
And it was filled with a steady stream of people suffering from dehydration, nausea and lightheadedness and even vomiting. Early signs of heat stroke.
“If you start feeling tired, you're already in trouble,” said Jones.
But trouble didn't last long for Lisa Hunter. Water - fans - and ice packs.Then...
“Looking forward to going back out,” said Hunter.
Temperatures in Las Vegas this weekend could top out at more than 120-degrees.