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Short-Term Severe/Flooding Discussion


Quincy
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Kind of underwhelmed right now. Surface obs across the New Mexico side of the watch show meager low-level moisture, with dew-points mainly in the 40s (and dropping at many sites). Mesoanalysis shows soaring LCLs and decreasing CAPE. 

A more bonafide tornado threat may not develop until after 00z as the low-level jet cranks and better boundary layer moisture backs westward. 

If the Clovis vicinity cell can hang on and eventually ingest richer quality low-level moisture, maybe then it can better organize. 

Any sig/long-track tornado threat seems highly conditional, unless something goes up soon across West Texas, or if low-level jet-aided moisture transport leads to modest airmass recovery across eastern New Mexico this evening. Such recovery seems fairly unlikely, although HRRR continues to show rapid moisture advection by 00-02z.

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47 minutes ago, Quincy said:

Kind of underwhelmed right now. Surface obs across the New Mexico side of the watch show meager low-level moisture, with dew-points mainly in the 40s (and dropping at many sites). Mesoanalysis shows soaring LCLs and decreasing CAPE. 

A more bonafide tornado threat may not develop until after 00z as the low-level jet cranks and better boundary layer moisture backs westward. 

If the Clovis vicinity cell can hang on and eventually ingest richer quality low-level moisture, maybe then it can better organize. 

Any sig/long-track tornado threat seems highly conditional, unless something goes up soon across West Texas, or if low-level jet-aided moisture transport leads to modest airmass recovery across eastern New Mexico this evening. Such recovery seems fairly unlikely, although HRRR continues to show rapid moisture advection by 00-02z.

This.  The cells look starved both of moisture and low-level vorticity.

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Evening model runs looking pretty interesting over the E TX Panhandle and west-central/SW OK tomorrow. 00z soundings show high quality BL moisture in place over the source regions (FWD, CRP, BRO). Even OUN has an 11-12˚C H85 dewpoint. Most of the VBV showing up in the soundings by 00z looks to be above 500 mb, which is another plus. Steep lapse rates showing up over the EML source regions for this setup.

Barring a very significant increase in convective coverage tonight, I think we should see a fairly healthy warm sector tomorrow afternoon. Going to be dependent on the western branch of the low level jet strengthening sufficiently for higher tornado chances though, but synoptically speaking, it looks like one that could yield a few tubes.

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33 minutes ago, andyhb said:

Evening model runs looking pretty interesting over the E TX Panhandle and west-central/SW OK tomorrow. 00z soundings show high quality BL moisture in place over the source regions (FWD, CRP, BRO). Even OUN has an 11-12˚C H85 dewpoint. Most of the VBV showing up in the soundings by 00z looks to be above 500 mb, which is another plus. Steep lapse rates showing up over the EML source regions for this setup.

Barring a very significant increase in convective coverage tonight, I think we should see a fairly healthy warm sector tomorrow afternoon. Going to be dependent on the western branch of the low level jet strengthening sufficiently for higher tornado chances though, but synoptically speaking, it looks like one that could yield a few tubes.

Certainly... Most of the 00Z models I have seen thus far are indicating a fairly substantial parameter space developing, though spatially limited, across E TX PH and into W/SW OK... main question would be convective initiation, given the expected strength of the cap...  Nonethless most models show convective inhibition weakening sufficiently by 21-00Z for CI to occur along the DL (perhaps a DL bulge near the jet max will increase low-level convergence and will further aid in CI)... however the 12NAM/3NAM/GFS are all fairly sparse, and short-lived, with convection along the dry line by late afternoon/early evening. Tricky forecast. Any discrete supercells within that parameter-space "sweet spot" would have a good shot at tornadoes, and perhaps a strong tornado, given impressive PBL moisture --> low-LCLs, ~200m2/s2 0-1KM SRH, impressive instability (especially low-level 0-3KM CAPE, nearing 150J/KG per 00Z GFS), and strong cloud-layer shear of 60-75kts. 

 

If CAMs continue to zone in on this particular area, wouldn't be surprised to see a 10% hatched TOR by the 1630 or 20Z D1SWO updates. 

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