You can avoid the damage from the Snowstorm for a short time using the Queen sign. However, you can’t reactivate the Queen sign whilst you take damage so you can only activate it whilst you are in a shelter. Go from one shelter to the closest next one as quickly as you can and recast the Queen sign every time you are in a shelter. Another thing to watch out for is fall damage although there is very little you can do about it. If you run low on life you can eat something or use a potion or wait for a while as your health slowly regenerates.
Find the Next Passage in Overgrown Area with Spires – Through Time and Space – The Witcher 3 Wild Hunt
To find the next passage follow the path and climb up a ledge from where you fist see the next portal. Go around the spire to the right then head straight towards the portal until you find a place of power:
Turn right and go down the path. Be careful when you drop down both the cliff at the end, stick close to the wall to the right to minimize fall damage. Go back up the the platform ahead. Then go back down the other side and quickly run through the fog to the ledge ahead:
Now go straight towards the portal by following the quest marker.
The source of the magical disturbance is inside a bunch of crates stacked nearby the ugliest man alive:
To find the sword named Brokvar pick up the key to the cellar from one of the rooms inside the house:
Then open the trapdoor at the back right corner of the house, go down and pick up the sword named Brokvar: