Post by HarahanTim - Now in Covington! on Feb 12, 2022 7:15:39 GMT -6
A thread for the anticipated severe weather, along parts of the gulf south, from Wednesday Feb. 16, to primarily Thursday, Feb. 17. As the threats indicated in the graphics shown here, are so large, while so far out, I think it would be good to keep one open eye out.
Thanks, Tim. That is a large swath. NWS forecast for my area seems a little sketchy this far out as to what the chances are of t-storms in our area and how severe. Certainly this is something to watch. At the moment, it appears (only appears mind you) to be more of a Northshore threat and perhaps a MS/AL threat. Unfortunately, places like Tuscaloosa, Alabama have had their share of tornadoes and severe weather threats. This may raise some anxiety levels particularly in those areas.
"Let's work the problem, people; don't make things worse by guessing!"
Post by thermalwind - Touro on Feb 14, 2022 9:14:18 GMT -6
Timing is going to matter, as of its just a little bit slower it'll be an afternoon event for the south and there will be more instability to work with.
Dont want anything popping off in the warm sector with the shear available.
Post by Zack Fradella on Feb 16, 2022 6:52:26 GMT -6
Dynamics will be lifting out too quickly with this event tomorrow. Not much forcing expected down here along the Gulf Coast so a generic line of storms looks most likely.
In the December part of the LRC, this yielding a bad outbreak to our north mainly because we were so warm/humid already. Now that the Gulf is colder, you need time for the atmosphere to recover.
Last Edit: Feb 16, 2022 6:54:18 GMT -6 by Zack Fradella
Dynamics will be lifting out too quickly with this event tomorrow. Not much forcing expected down here along the Gulf Coast so a generic line of storms looks most likely.
In the December part of the LRC, this yielding a bad outbreak to our north mainly because we were so warm/humid already. Now that the Gulf is colder, you need time for the atmosphere to recover.
I assume one of the reasons why severe weather developes further from the onshore flow is that the instability from land heating increases as you go inland.
Living nearer the lake in Mandeville it's most common to only see the storms really pop once they get closer to the MS line.
Dynamics will be lifting out too quickly with this event tomorrow. Not much forcing expected down here along the Gulf Coast so a generic line of storms looks most likely.
In the December part of the LRC, this yielding a bad outbreak to our north mainly because we were so warm/humid already. Now that the Gulf is colder, you need time for the atmosphere to recover.
I assume one of the reasons why severe weather developes further from the onshore flow is that the instability from land heating increases as you go inland.
Living nearer the lake in Mandeville it's most common to only see the storms really pop once they get closer to the MS line.
The more I study our severe weather and the "big" events...westerly winds in mid levels makes all the difference for us. Our biggest events come from warm front convection (which is typically west winds) or the right position of a trough bringing more west mid level winds rather than SW.
Post by Zack Fradella on Feb 16, 2022 8:45:34 GMT -6
The reasoning for this is we struggle to organize convection from the Gulf because of a lack of "heat". So when we get west winds in the mid levels, storms are more right movers. Like February 2017. Last year the lift boat tragedy was from storms organizing to the NW and plowing SE. Not SW to NE moving cells.
The reasoning for this is we struggle to organize convection from the Gulf because of a lack of "heat". So when we get west winds in the mid levels, storms are more right movers. Like February 2017. Last year the lift boat tragedy was from storms organizing to the NW and plowing SE. Not SW to NE moving cells.
Am I reading that right? What about west winds in the mid levels causes storms to develop and move SE? Why not just eastward?
The reasoning for this is we struggle to organize convection from the Gulf because of a lack of "heat". So when we get west winds in the mid levels, storms are more right movers. Like February 2017. Last year the lift boat tragedy was from storms organizing to the NW and plowing SE. Not SW to NE moving cells.
Am I reading that right? What about west winds in the mid levels causes storms to develop and move SE? Why not just eastward?
Has to do with the updraft/downdraft dynamics. The explainer is super technical, and Im lazy.
But what happens is you get storms that deviate from the flow in the atmosphere. Sometimes you'll see a cell split with one side moving left of the mean motion of everything else and the other move right of the mean motion.
Once they get right moving, you have a mature abd violent updraft and really have cranked the tornado potential.
Post by Will - Ascension Parish on Feb 16, 2022 13:11:29 GMT -6
That makes sense. The worst severe storms I’ve ever experienced came from west to east. The worst one hit Donaldsonville on April 7, 2003. That was a mean SOB! Very strong winds, enormous hail, and it wouldn’t surprise me if the there was a tornado close by. It hit at around 1 or 2 in the afternoon but it was pitch black. I mean BLACK before it hit. Like midnight black with a touch of green. I had never seen anything like that before and haven’t since that day. Definitely a once in a lifetime storm in my opinion. And the storm even spun like a mini hurricane on radar! If someone could post a radar loop of that storm I would be forever grateful. I’ve searched for it for years and can’t find it.
That makes sense. The worst severe storms I’ve ever experienced came from west to east. The worst one hit Donaldsonville on April 7, 2003. That was a mean SOB! Very strong winds, enormous hail, and it wouldn’t surprise me if the there was a tornado close by. It hit at around 1 or 2 in the afternoon but it was pitch black. I mean BLACK before it hit. Like midnight black with a touch of green. I had never seen anything like that before and haven’t since that day. Definitely a once in a lifetime storm in my opinion. And the storm even spun like a mini hurricane on radar! If someone could post a radar loop of that storm I would be forever grateful. I’ve searched for it for years and can’t find it.
I've used it for some tabletop disaster exercises before. It gives them a real feel when you can show a radar screen cap from a past significant event.
As for tomorrow...just a day in the life up here in Mississippi. I still kinda hate it, though.
That makes sense. The worst severe storms I’ve ever experienced came from west to east. The worst one hit Donaldsonville on April 7, 2003. That was a mean SOB! Very strong winds, enormous hail, and it wouldn’t surprise me if the there was a tornado close by. It hit at around 1 or 2 in the afternoon but it was pitch black. I mean BLACK before it hit. Like midnight black with a touch of green. I had never seen anything like that before and haven’t since that day. Definitely a once in a lifetime storm in my opinion. And the storm even spun like a mini hurricane on radar! If someone could post a radar loop of that storm I would be forever grateful. I’ve searched for it for years and can’t find it.
I remember a storm actually not terribly long ago that had the same mini hurricane look to it (spring of 2017 maybe?) I'll dig through the forum and see if i can find it. It did a decent amount of damage near Womans Hospital in BR. There was also that borderline derecho that blew through Louisiana in April of 2015 as well that turned mid morning into just about midnight as well.