If you know anyone in these highest threat levels especially, maybe encourage them to make use of a storm shelter or a basement that is at least partly underground today, if they have it available.
Even in the hot zones, most people will be okay as long as they do the right things in a site-built home/other sturdy structure and do not stay in a mobile home.
* Away from windows.
* Lowest floor
* Small room like a bathroom or closet, or hallway
* As many walls between you and storm outside as possible
* Shield body from falling or flying debris, especially head/neck
Around here, we do not have as much of a severe weather risk, but it is still somewhat significant. Severe thunderstorms and tornadoes are possible tonight along and within a squall line. It will probably start in Northwest Alabama between about 9 PM and Midnight, and that is when/where the tornado potential or potential for especially damaging thunderstorm winds is expected to be highest.
The main around here is that when you go to bed tonight, have a way to get warnings that will wake you up. And be able to get to that safe place in your house within five minutes.
If you have to leave to go to a better shelter, like from a mobile home, then you'll need to do more planning, get up ever so often and check the progress of the storms. Or you could choose to go to the shelter or a friend's sturdy house when the watch comes out and not wait for the storms to get close. I know it is inconvenient, but today/tonight is dangerous.
12:39 PM update - Watching trends. Be alert even this evening going into the night hours. Some supercells might try to form in Northwest Alabama or adjacent parts of Tennessee earlier than what was previously expected. It is basically down to watching the radar and whatever ground truth there is, and a little bit of watching mesoscale trends like during any severe weather event. I guess a best-case scenario around here would be for a mixed, messy storm mode to lessen our severe weather threat somewhat. But we can't count on that. Even if that happens to an extent, one or two spots in our TN Valley region could still get hit with significant damaging winds or a tornado. Please stay safe and check on the people you love until this is over with.
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WOUS40 KWNS 311639
PUBLIC SEVERE WEATHER OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1139 AM CDT FRI MAR 31 2023
...Outbreak of tornadoes and severe thunderstorms expected over
parts of the portions of the Midwest and the lower MS/TN River
Valleys this afternoon and tonight...
Numerous tornadoes, several intense and long track
Widespread damaging winds, some hurricane force
Scattered large hail, some baseball size
A severe weather outbreak appears increasingly likely, centered
on this afternoon and evening, across a large portion of the
Mississippi Valley. At least a few long-track, strong to
potentially violent tornadoes are probable, particularly over
portions of the Mid-Mississippi Valley to the Mid-South. Swaths
of intense damaging wind gusts along with very large hail are
expected as well.
Review your severe weather safety procedures for the possibility
of dangerous weather today. Stay tuned to NOAA Weather Radio,
weather.gov, or other media for watches and warnings. A tornado
watch means that conditions are favorable for tornadoes to form
during the next several hours. If a tornado warning is issued for
your area, move to a place of safety, ideally in a basement or
interior room on the lowest floor of a sturdy building.