In the Words of the NWS Storm Prediction Center...

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"An extremely dangerous, life-threatening situation continues to unfold this afternoon across a large part of MS and AL...with adjacent portions of TN and NW GA also expected to become a concern late this afternoon and evening."

The Birmingham radar is downright ominous at the moment (4:42pm CDT) with two hook echos, one southwest of Birmingham:
click to enlarge

Hooks (tornado signatures) are circled, arrows indicate the previous paths of the hooks indicating perhaps long-track tornadoes.
Tornado warnings are in effect for these areas!

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