ZCZC SPCSWOMCD ALL ACUS11 KWNS 300715 SPC MCD 300715 SCZ000-GAZ000-ALZ000-300845- Mesoscale Discussion 2083 NWS Storm Prediction Center Norman OK 0115 AM CST Thu Dec 30 2021 Areas affected...Portions of central AL into central/eastern GA and far west-central SC Concerning...Tornado Watch 571... Valid 300715Z - 300845Z The severe weather threat for Tornado Watch 571 continues. SUMMARY...An isolated severe threat continues in/near Tornado Watch 571. Downstream watch issuance into more of eastern Georgia and central South Carolina appears unlikely at this time. DISCUSSION...A broken line of convection extends from parts of central AL into GA and upstate SC early this morning. The leading portion of the line now moving into central SC has shown a general weakening trend over the past couple of hours. A less unstable airmass with more convective inhibition noted in latest mesoanalysis estimates may continue to limit the severe potential in the short term across SC. Therefore, downstream watch issuance into more of eastern GA and central SC appears unlikely at this time. Farther west into central AL/GA, the ongoing broken line is oriented largely parallel to the deep-layer shear vectors. The low-level flow has also largely veered to a west-southwesterly component based on recent VWPs for KBMX/KMXX/KFFC. This is limiting directional shear and 0-1-km SRH, but effective bulk shear of 45-50 kt is still present. This shear can still support supercells, although the current storm mode appears rather messy at the moment. The moist low-level airmass and related 500-1000 J/kg of MLCAPE present should also be sufficient to support surface-based storms along/south of the ongoing activity. An isolated threat for damaging winds and perhaps a tornado continues in/near Tornado Watch 571. But, it does appear that the overall severe threat may be gradually diminishing. ..Gleason.. 12/30/2021 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...CAE...GSP...FFC...BMX... LAT...LON 33248695 33498608 33698387 34048207 34398148 34188124 33058351 32698679 32728722 32948738 33118730 33248695 NNNN