For future reference, check out weather.gov and read the forecast discussion - it's written by your local meteorologist and is THICK with jargon and interesting stuff to google. It's sort of the 'root' for weather information and you pay for it anyways through taxes. It's great.

Portland, OR example: https://forecast.weather.gov/product.php?site=PQR&issuedby=P...

EDIT: Look through the history to get their perspective on what happened - just click "previous version" to go back in time!