Mesoscale Discussion 1344
   NWS Storm Prediction Center Norman OK
   0515 PM CDT Thu Jun 29 2023

   Areas affected...Parts of northern Alabama

   Concerning...Severe Thunderstorm Watch 418...

   Valid 292215Z - 292345Z

   The severe weather threat for Severe Thunderstorm Watch 418
   continues.

   SUMMARY...Large hail and damaging winds remain possible with a
   southward-moving supercell cluster in northern Alabama this evening.
   It is unclear if a small downstream watch will be needed, though
   trends are being monitored.

   DISCUSSION...Latest regional radar data shows a southward-advancing
   supercell cluster in northern Alabama this evening, which is
   tracking along the eastern edge of a strongly unstable surface-based
   air mass. In the short-term, large hail (possibly to 2 inches in
   diameter) and damaging winds remain possible with this activity.
   Within the pre-convective environment, a moist and well-mixed
   boundary layer (evident via surface obs and HCRs in visible
   satellite imagery) could support the maintenance of this supercell
   cluster with southward extent, before the onset of increasing
   nocturnal static stability. Modest deep-layer flow/shear limits
   confidence in how long lived convection will be this evening, or how
   large of an area will be affected. Trends are being monitored for a
   new watch downstream of Severe Thunderstorm Watch 418.

   ..Weinman/Hart.. 06/29/2023

   ...Please see www.spc.noaa.gov for graphic product...

   ATTN...WFO...BMX...HUN...

   LAT...LON   34068790 34438786 34668772 34738753 34728705 34588678
               34368665 33928662 33548690 33558740 33718774 34068790