arreciar

arreciar
ah-rreh-see-ahr'
to intensify, to get stronger, to get worse
Examples
1. ¿Viste esa señal? Creo que los vientos arreciarán.
Did you see that sign? I think the wind is going to get stronger.
 
2. Si la nieve arrecia, me voy a parar al lado del camino.
If the snow gets worse, I'm going to pull over to the side of the road.