After an Action has been performed, players check the weather.
The symbol on the top right corner of any action card tells you how many points that card will add to the Storm Deck.
After the card has been added, count up all the points in the Storm Deck.
A Storm strikes at:
8 points in a 2-player game
10 points in a 3-player
12 points in a 4-player game.
If the Storm hasn't hit yet, the current player continues with their turn.