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Short-Term Severe/Flooding Discussion


Quincy
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  • 2 weeks later...

The SPC has a slight risk for the central area of Nebraska down to near Midland/Odessa Texas today. 0-6 km shear should be at least 50 kt, as 500mb winds are at least 50kt. Shear may even up to 65 kt in some instances for storms that develop today. Medium values of LCL and storm-relative helicity may limit tornado potential.

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46 minutes ago, Chinook said:

Medium values of LCL and storm-relative helicity may limit tornado potential.

Large dew-point depressions as well, although an area of upper 50s dews over north-central Kansas as of 19z should advect into southern Nebraska. A locally enhanced severe threat may develop in this vicinity where the shear/instability overlay will be more favorable than points south.  

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The cell crossing the TX border into LA is really interesting. You have a north-most Tornado warned portion of the cell that's directly connected to a southern flanking bow echo that's SVR warned. Usually we see 'tail end Charlie's' - but what's the name for this?

I don't remember seeing this situation that frequently.

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Just now, SluggerWx said:

Not sure if someone's going to start a thread about Sunday or events into next week, maybe it would be a good idea... Anyways, 18z GFS shows pretty pretty crazy soundings near Ardmore, OK Sunday evening.

gfs_2017032418_054_34.25--96.75.png

 

Wouldn't be opposed to a thread. Sunday and Tuesday may end up being decent events.

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Generally positive trends on the guidance the last 24 h, for what they're worth given the baseline. I'm liking the nudge back toward a negative tilt on this wave, and the (somewhat related) more rapid moisture return Sunday afternoon. Moisture will almost certainly put the event ceiling somewhere below a multi-storm tornado outbreak, but intense supercells with some low-end evening threat are more plausible now.

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46 minutes ago, bjc0303 said:

experimental HRRR looks..active, you could say. 

hrrrx_ref2_okc_36.png

Good lord.... I'd have to figure that having six-plus discrete supercells like this would end up leading to a pretty prolific day tomorrow, especially if we pull off getting DPs of 60+.

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Feel free to bump troll this tomorrow, but I really doubt CI will be a problem by 5-6pm. With this kind of compact, neutral/negative tilt shortwave and a generally NNW-SSE dryline, you aren't often going to lack for storms unless moisture is truly nonexistent. This is also a classic setup where the model consensus (and especially the NAM with its convective scheme) is too bearish on CI during the afternoon hours.

Junky storms? Very possible, but that's probably the least exciting plausible scenario.

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