Rain showers will overspread the Valley this afternoon. While isolated (but persistent) showers are possible throughout the day; it will be during the afternoon that the steady rain moves in. Since the showers will be coming in from west to east, the Shoals will see the onset of the steady activity first.
The isolated type showers we've been dealing with there all morning will remain possible through the early afternoon. Then we'll see the more widespread rain. Expect that activity to last into the evening before winding down by midnight.
The heavier rain should begin shifting into the Huntsville metro area this evening. It's possible the heavy activity will hold off just long enough to miss the evening rush, but it will be a close call. Expect the widespread rain to last into tonight before ending early Thursday morning.
Places like Sand Mountain and Lookout Mountain will have to wait the longest to see the widespread rain. It should shift in by the late evening. These will also be the places that see the rain hang on longer into the Thursday morning. But, even in eastern Alabama, I'd still expect most of it to be gone by 6-8 am.
Skies should begin to clear on Thursday, but it will still be cooler than today. Highs will be in the low-to-mid 60s with mid 50s expected for Friday.
-Meteorologist David Ernst