Not entirely OT, but this is a relatively new display offered by the National Hurricane Center to try to estimate the predicted rainfall based on the path of a tropical depression. Hard to say how accurate it is, but with storms like Isaac after they hit the coast, it's the rain that gets you.

If you're in the path, may be a good time for culvert patrol and move the boxes of documents out of the basement....

http://www.hpc.ncep.noaa.gov/tropical/qpf/tcqpf.php

It's not typical to have to take precautions in Illinois and Indiana, but that's what this is effectively saying. If this is at all accurate, it's a welcome addition.

Outing myself as a weather geek :D
Check the sidebar on the HPC map. They offer far more than tropical products. Every morning and evening they issue a five-day forecast, in winter they offer snow, ice and freezing rain maps, and they always have excessive rainfall probability maps to show where there may be flash flooding.
Also, if you live around a major river, check
http://www.erh.noaa.gov/ohrfc
(or click on whatever your region is.) Their forecasts will give you a heads-up if you have a river near your works, often days before your local TV weather catches on. They're pretty decent (we live near the Ohio), so you'll neither get "Apocalypse NOW!" nor "It's going to be nice and sunny next week...oh, yeah, and the river may be ten feet out of its banks by tonight."
If you're having an event and want to know whether there may be any severe thunderstorms, try the Storm PRediction Center (they also have a great one-glance national radar on the home page):
http://www.spc.noaa.gov/
They have an Experimental Thunderstorm Forecast on their Outlooks page that is pretty good at telling you how likely it is that there'll be any storms around in a given four-hour period.

Places downstream of these areas who may have avoided Issac's deluge should take note as well-all of that water has to go somewhere! Better into an empty basement than important documents or tools!

I saw on the news that Pine Bluff, AR is flooded.