WeatherSpark--Do you like well designed graphs? Who am I kidding, of course you do. It's always good to check out how the probability of precipitation changes throughout the day with this site.
Look how pretty these graphs are
The Diag Cam--From high up on Shapiro, the Diag Cam lets you see what the weather is like on the Diag at any given moment.
At the time of press, it was raining on the Diag
forecast.weather.gov--Weather straight from the horses mouth. A great resource for weather radar of the region and the often ominous hazardous weather outlook.
Doesn't that look ominous?
If you are concerned with regional flooding both HamWeather and USGS have good webpages showing the height of rivers in the area. I hope you have found this guide informative and that you will use the resources here to wast time on the internet.