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Tallis Rockwell

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  1. E EDIT: The new outlook has a better picture ...DISCUSSION... The latest runs of the GFS and ECMWF appear to be in reasonable agreement with respect to synoptic-scale features through Day 4 and into the first half of the Day 5 period. After this, differences in the evolution of the large trough progged to crossing the Plains states Day 4 and then the Mississippi Day 5 begin to become fairly substantial. As such, confidence in the predictability of the pattern beyond day 5 is quite limited. In the mean time, some potential for the evolution of scattered to isolated severe storms remains apparent over the eastern Oklahoma and Arklatex region and surrounding areas Day 4 (Sunday 10-20), as a deepening surface low shifts out of the central and northern High Plains and eventually reaches the Minnesota vicinity. Correspondingly, a trailing cold front is shown crossing eastern Kansas/Oklahoma/western Texas during the afternoon, as warm-sector destabilization becomes diurnally maximized. As favorably strong flow aloft overspreads the region in tandem with the advancing surface front, at least isolated cells -- developing as residual capping is locally breached -- will evolve within a sheared environment likely supportive of rotating updrafts. Storms may diminish somewhat in intensity overnight, but it appears that reintensification of convection -- and regeneration of accompanying severe risk -- should occur across portions of the central Gulf Coast region, as the front continues its eastward advance through an amply moist/destabilizing low-level airmass. Again, potential for supercells, and all severe hazards, appears possible. By Day 6, model differences -- including with location of the surface frontal position -- have become substantial enough to preclude continuation of severe risk into the eastern Gulf Coast/southern Atlantic Coast states.
  2. The short range models are starting to agree with 20+ inch totals
  3. GFS NAM RAP hasn't reached to this time yet...either way this looks to be interesting
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