Mesoscale Discussion 1709 NWS Storm Prediction Center Norman OK 0845 PM CDT Wed Sep 23 2020 Areas affected...Southeast LA...Southwest MS Concerning...Tornado Watch 494... Valid 240145Z - 240345Z The severe weather threat for Tornado Watch 494 continues. SUMMARY...A few strong storms remain possible across the lower Mississippi Valley tonight - including the threat for a brief tornado or two. DISCUSSION...Remnants of Tropical Cyclone Beta continue to shift slowly east-northeast across the lower MS Valley. Strongest instability remains confined along a corridor across southeast LA where surface dew points are in the mid-upper 70s. 00z sounding from LIX appeared to sample eastern portions of the most buoyant air mass with a surface-based parcel yielding 1100 J/kg. Even so, individual convective updrafts have struggled to exhibit appreciable strength/longevity, possibly due to stronger low-level shear maximized well north of this region across northern MS/AL. East-west boundary draped across southern MS remains the primary focus for potential supercells over the next few hours. ..Darrow.. 09/24/2020 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...JAN...LIX...LCH...SHV... LAT...LON 31489201 31889048 30869047 30479201 31489201Read more
from SPC Forecast Products http://www.spc.noaa.gov/products/md/md1709.html
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