Once the rain starts late Tuesday, Portland will see a string of wet and increasingly cold days heading into the weekend.

Now you can find out how hard it is raining outside without leaving the confines of your mancave/womancave. Pictured above is the sensor portion of what [Frapedia] calls his visual rain sensor.

If you’ve been outside lately, you’ve likely noticed the air feels cleaner and fresher. Last week’s rain significantly helped ...