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Severe 3/17/21 Severe Weather Outbreak Al/Ms/Tn/Ar nowcast

Can someone explain why Huntsville NWS declined to put all the counties outlined by SPC in the watch? I've noticed this happens from time to time with different offices so just curious
 
Looks like the two cells joined together broad rotation but if it gets tight this one will be a big booger. Screenshot_20210317-124344.pngScreenshot_20210317-124337.png
 
blitzgunner said:
It is still pretty cloudy in Birmingham. If the sun can’t break out today does that lessen the chance of tornadoes occurring?
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The sun and heat helping fuel storms are just one ingredient of many for tornadoes to form. It can help limit the chances if cloudy but in no way means tornadoes aren’t possible just because it’s cloudy before hand. The Nashville ef3 tornado last March is probably a great example of this. That day just didn’t feel like a bad tornado day and wasn’t very warm that I recall.
 
The area outlined in the recent watch will be the most favorable for strong, long-track tornadoes, because there's just enough space for 2-3 discrete cells to form without being impeded by multicellular convective features.
 
That southern mississippi supercell with rotation, it's rotation keeps widening I'm guessing this one wants to be a wedge.
 
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