Severe WX April 19-20, 2020 Severe Weather Threat

[Kory]

Couplet looks pretty broad now. TDS is gone too. Doubt it's still on the ground.

I agree. May cycle though but this is a high precip mess.

 

[buckeye05]

I agree. May cycle though but this is a high precip mess.

Yeah tons of precip and upscale growth. Based on past experience, this was probably a one and done type of storm. Hopefully at least.

 

[Equus]

Storms south of Montgomery look a little more robust. Still at least some potential tonight.

 

[buckeye05]

Yeah my attention is shifting to the SE Alabama storms now.

 

[TornadoFan]

New tornado warning on the same storm.

 

[xJownage]

The Union Springs cell is definitely north of the warm front even still, is the front expected to progress north as the night goes on?

 

[Jetstream]

Picking this storm up now using Mobile Al radar.....

 

[TornadoFan]

Looks like it's tightening up again.

 

[Richardjacks]

I am beginning to wonder if we may see a gravity wave in northern Alabama starting in west Alabama, north of the warm front. Will be watching for a sharp cutoff to the rain back to the west starting to accelerate east.

 

[xJownage]

The cell in E AL approaching Hurtsboro is very well N of the front, but appears supercellular. Is this storm elevated? There's certainly some rotation on the lowest scan, but it's still at 1800 ft.

 

[Cliffhanger]

Facebook live stream from NWS JAN

Thanks for posting that. Watching that, I was able to warn a friend who lives south of Hattiesburg, and monitor it for him. He's okay, BTW.

 

[gangstonc]

I am beginning to wonder if we may see a gravity wave in northern Alabama starting in west Alabama, north of the warm front. Will be watching for a sharp cutoff to the rain back to the west starting to accelerate east.

What would the effect be?

 

[AL_ham_op]

What would the effect be?

Widespread high winds.

 

[MichelleH]

Oh please no, not a gravity wave.

 

[buckeye05]

Still broad, but the rotation is intense. Surprisingly, I could actually see this producing again if it manages to tighten up a little more.

 

[vanni9283]

Oh please no, not a gravity wave.

What is a gravity wave?

 

[Cliffhanger]

What is a gravity wave?

Imagine ocean waves, only air. Widespread straight-line wind event, often causing damage along the path of the wave.

 

[Richardjacks]

Imagine ocean waves, only air. Widespread straight-line wind event, often causing damage along the path of the wave.

Yes but typically less than 50 mph and they usually occur during widepsread heavy rain events like this with a cool, stable boundary layer. Although the winds aren't considered severe, they can be enough to down trees when the soil is so saturated like we have now.

 

[buckeye05]

Still broad, but the rotation is intense. Surprisingly, I could actually see this producing again if it manages to tighten up a little more.

Meh. Weakening now and looking more outflow dominant. I think this event is drawing to a close. Definitely a good thing they didn't go high risk.

 

[Pugii]

Looks like MOB is going to let the warning expire and downgrade it to a severe thunderstorm warning.