The SPC is forecasting ...Severe thunderstorms expected over parts of the southern High Plains this afternoon and tonight....   Please read the latest public statement about this event.  View What is a Watch? clip.

   SPC AC 071630

   Day 1 Convective Outlook  
   NWS Storm Prediction Center Norman OK
   1130 AM CDT Tue May 07 2019

   Valid 071630Z - 081200Z

   ...THERE IS A MODERATE RISK OF SEVERE THUNDERSTORMS ACROSS THE TEXAS
   PANHANDLE AND WESTERN OKLAHOMA...

   ...SUMMARY...
   Severe thunderstorms are likely this afternoon into tonight,
   particularly across the Texas Panhandle and western Oklahoma. A
   couple of strong tornadoes, very large hail, and damaging winds will
   all be possible.

   ...Southern Plains this afternoon and tonight...
   An upper low over Arizona, with a preceding cyclonically curved belt
   (50+ kt at 500 mb) of strengthening southwesterly winds aloft, will
   spread east-northeasterly toward the southern High Plains through
   tonight. A leading belt of forcing for ascent, as subtly evidenced
   per water vapor imagery, appears to be crossing New Mexico late this
   morning with a related increase in thunderstorms from northeast New
   Mexico into the Texas/Oklahoma Panhandles. A moist environment
   exists early today across the region, with northward-advecting 12Z
   subjectively analyzed 12-16C 850 mb dewpoints (mean-mixing ratios
   >12g/kg) extending from the Lower Rio Grande vicinity of South Texas
   into the Texas South Plains. 

   Regarding the possibility of an increasing severe risk early this
   afternoon in vicinity of the surface front, see Mesoscale Discussion
   567. Farther south, initial intense surface-based supercell
   development will become more likely by around mid-afternoon across
   the Texas Panhandle near and just south of a surface low/dryline and
   arcing front-related triple point. Pending the disposition of
   ongoing early-day storms, additional low-level upslope-aided
   supercellular development could also occur this afternoon across the
   Raton Meso vicinity of northeast New Mexico and southeast Colorado.
   Across the Texas Panhandle into the Texas South Plains, 35-40 kt of
   effective shear in conjunction with very steep mid-level lapse rates
   and 2500-3000 J/kg MLCAPE will support initial supercells capable of
   very large hail and some tornado risk. 

   A steady increase in low-level shear/SRH is likely to occur late
   this afternoon and especially early this evening in the warm sector,
   with effective SRH likely climbing in excess of 200 m2/s2. The
   semi-discrete storm mode, at least for a time, along with increasing
   low-level shear is likely to support an increase in tornado risk by
   early evening, with the potential for a couple of strong tornadoes.

   Upscale growth into clusters and eventually a more extensive QLCS is
   expected into mid/late evening and the overnight hours from
   northwest Texas into western/central Oklahoma and southern Kansas.
   Damaging winds will become a more substantial threat will embedded
   supercells/bowing segments tonight, though large hail will remain
   possible. A couple of tornadoes and/or severe gusts may also occur
   with circulations embedded within the QLCS.

   ..Guyer/Coniglio.. 05/07/2019

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