Storms don’t wash pollen away—they burst it into tiny pieces. Here's how it can lead to "thunderstorm asthma." ...

Add Yahoo as a preferred source to see more of our stories on Google. PORTLAND, Ore. (KOIN) — Spring thunderstorms are expected to build across western Oregon during the early evening hours on Friday.

Tornadoes are a reality in Michigan and the Midwest, and spring is the time in which they are most frequent.