Severe WX March 29-30, 2022 Severe Event

At 20z dew points aren't really increasing east of the line, stuck in the 60-63 range; even though the line isn't moving quickly am definitely not as confident on moisture return as I was a little bit ago. Strong forcing will certainly keep the line going but if dews stay pretty low that will keep surface instability really marginal and hopefully cut down on damaging wind just a little this far east. That said, the southerly advection out there is intense, so can't count good moisture return completely out just yet
 
Equus said:
At 20z dew points aren't really increasing east of the line, stuck in the 60-63 range; even though the line isn't moving quickly am definitely not as confident on moisture return as I was a little bit ago. Strong forcing will certainly keep the line going but if dews stay pretty low that will keep surface instability really marginal and hopefully cut down on damaging wind just a little this far east. That said, the southerly advection out there is intense, so can't count good moisture return completely out just yet
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Lower dewpoints, to an extent, will actually increase the damaging wind threat because of better evaporational cooling potential in the downdrafts. The inverted-v soundings we're seeing because of the marginal moisture are a textbook classic damaging wind signal.
 
TileDude said:
I’m north of Birmingham and I’m at 81/58 and dp is slowly rising. Wind gust to 30 so far.
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Its definitely warm enough at 83 but the dewpoint dropped to 52, which also matches the highest wind gust in the last hour. The winds are DEFINITELY bringing the warmth but not the moisture. Tuscaloosa is 81/59, Alabaster 85/54 & Anniston 82/50. So we may approach record highs today.
 
I got 78/53, getting gusts I am surprised aren't taking down tree branches
 
According to recent soundings, there's still somewhat of a cap out ahead of the squall line. This could be why any discrete cells that have been forming ahead of the line have not currently been able to organize very well despite the ample instability and shear present.
 
Fred Gossage said:
Lower dewpoints, to an extent, will actually increase the damaging wind threat because of better evaporational cooling potential in the downdrafts. The inverted-v soundings we're seeing because of the marginal moisture are a textbook classic damaging wind signal.
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Fred why aren't these strong southerly winds not bringing in moisture? Obviously off the Gulf water temps are 70+ now. I would think we'd at least hit 60 before now. Demopolis & Bessemer are 58 dewpoints.
 
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A new watch will likely be coming for western Alabama within the next 1-3 hours.

Storm Prediction Center Mesoscale Discussion 358

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www.spc.noaa.gov
 
brianc33710 said:
Fred why aren't these strong southerly winds not bringing in moisture? Obviously off the Gulf water temps are 70+ now. I would think we'd at least hit 60 before now. Demopolis & Bessemer are 58 dewpoints.
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I am not Fred, but as you can see, higher Td's are not easily accessible to our south, lots of dry air over the northern GOM...Dothan has a Td of 54. You have to go further south to find 70, plus you have drier air aloft being mixed in counteracting what is advecting from the south...which is not very much.
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Anybody have a free radar site they like to use? I used to go to Baron's radar but apparently they've updated their webpage in the past couple days and its longer available. Not a big fan of weather.gov's since its update. Bonus points for velocity and warning overlays.
 
Weatherphreak said:
Anybody have a free radar site they like to use? I used to go to Baron's radar but apparently they've updated their webpage in the past couple days and its longer available. Not a big fan of weather.gov's since its update. Bonus points for velocity and warning overlays.
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weather.us

US-Radar HD 'Base reflectivity' from 03/30/2022, 04:18pm - Louisiana

High resolution images of US radar locations with archive back to 1991: Base reflectivity, base velocity, storm tracking, ...
weather.us weather.us
No warnings I am afraid, and you can't really move freely around, but good high res velocity and reflectivity for free with archive back to 1990s.
 
I’m surprised of the lack of wind reports today. Maybe delayed but it’s defiantly been a typical squall line day so far. Will be interesting to see as it moved east
 
I'm sure the LSRs for wind will catch up; they were very slow to catch up last Tuesday too until the ongoing severe weather slowed down a bit
 
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