We may see two rounds of potential rough weather. The first will be in the form of individual or discrete thunderstorms developing after 2-3 p.m. These storms would be isolated in nature, but would become more intense than the squall line expected later this evening if they do form.
Any isolated storm that develops mid/late afternoon would be capable of producing damaging wind gusts in excess of 70 mph and stronger EF-2/3 type tornadoes. This threat will be higher across west-central Alabama as instability and low-level moisture will be higher. Those storms will track quickly northeast and could move into northern Alabama.
The second round of strong-to-severe storms shifts in this evening in the form of a squall line. The line should shift into northwestern AL around 6-8 p.m. and track east. It shifts into the HSV Metro area by 9p-12a and should move through northeastern AL after 10 p.m. This line would be capable of producing wind gusts up to 60-65 mph as well as a brief, spin-up tornado. Flash flooding also becomes a concern due to prolonged heavy rain. Some areas will pick up 3-4" of rain overnight. The storm threat should be over area-wide by 3 a.m. Rain showers taper off Wednesday morning.
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