quote:
Crossing the river and putting down north of Vicksburg, then on to Yazoo, Holmes, Attalla, Choctaw Counties are like bowling lane.

Seems like the same down south around Laurel, Ellisville.

Definitely some microclimate patterns with nados. Also with trying to find the snow/rain crossover line in winter. Cold air spills through the delta and then hits the hills to slow down and it regularly follows a pattern.

quote:
Crossing the river and putting down north of Vicksburg, then on to Yazoo, Holmes, Attalla, Choctaw Counties are like bowling lane.

Seems like the same down south around Laurel, Ellisville.

That is possibly the best way I've seen it described: The geospatial correlation of tornadoes, especially big violent tornadoes, in these micro "tornado alleys" is precisely like a bowling lane, and the poor SOB's in the "Yazoo, Holmes, Attalla, Choctaw" progression are the bowling pins that wait and watch helplessly as the old pro lines up to strike them out.

And to scale those counties down to even tighter geographic alleyway, you could take it a step further with the "baby split" bowling move (had to Google "bowling moves" to get that one) where the pro is tactical about taking out individual remaining pins: The repetitive preciseness with how large tornadic storms follow the same general super-specific pathways puts certain communities within those countywide tornadic alleyways directly in the crosshairs more so than others.

For the sake of continuity and sticking with counties you named, take Attala and Choctaw counties for an example of the bowling pins that remain the sole focus of the bowling ball: Attala county examples could be the southeastern part of the Hesterville and also the McCool communities, and Choctaw county examples could be the aforementioned Chester community along with the area along and south of the Natchez Trace Parkway near French Camp going in a southernly direction down towards Weir, MS:

So within those counties are even tighter windows in which to roll the ball, and what's even more interesting is that upon visual inspection it seems that the farther east you go the more apparent the intensification of clustering becomes- even though this phenomena crops up randomly across the map, the correlation seems to be more apparent the more you pan eastward. (The disclaimer to this supposition is found in the key word "seems," as there is a difference between what the eye sees on a map and actual statistical & mathematical proof using geospatial analysis, but make no mistake: An observant eye noticing trends on a map that was made for a different set of reasons has been the catalyst for more GIS analysis studies than any blind, mathematical theorization. That's the beauty and science of maps: They are art and science, and they can be both right and wrong [and definitely wrong], but they speak to each observer in their own way but with a common theme.)

And regarding the intensified clustering as you go farther east, it seems as though there are several counties in Alabama where violent tornadoes begin to spread out over wider, more countywide "volatile corridors," but unfortunately for them the number of tornadoes increases exponentially. Cullman County, Alabama is a good example of this theoretical correlation between expanding tornadic "micro-alleyways" with intensified clustering as you go further east in certain areas, i.e., it's a bigger target area and you've got more bullets to shoot at it with:

One thing that does not warrant the "seems to be" disclaimer is this: There are some counties in Alabama where I'd be extremely apprehensive to live in because of the number of violent twisters that they have pass through; because 1 EF4 going through my community every 30 years is one too many, let alone every 20 years (and GIS analysis says that incident rate is becoming more and more common in Dixie Alley).

Cullman county (ESPECIALLY the SW to NE corridor) is a good example of this, but if I were an actuator looking to utilize these maps for insurance purposes, the folks from Pelham, AL north to Decatur, AL would see some rate increases- they are ALWAYS dealing with rotating thunderstorms that wind up shitting out one violent tornado after another:

I already have some stuff from 2014, but one of these days I'm going to sit down and run some GIS analysis models on this theory. It will be then that I find out some guys and gals way smarter than myself have already figured out it's a dead end, but regardless it's a peculiarly interesting discussion and I truly believe it to be a prudent decision for everyone in Dixie Alley to take a look at their home area and visually look for any trends: One day in the future if your mind is wondering elsewhere, if it's thinking of a hundred different things on a day where there are a hundred different storms surrounding you, then looking at and remembering that map might be what gives you enough pause to notice that a particularly dangerous thunderstorm has lined up, cocked back, and poised itself to send a burner ball down your lane- it did for me.