Subj : DAY1SVR: Day 1 Convective Outlook To : wx-storm@lists.illinois.edu From : COD Weather Processor Date : Thu Mar 14 2024 06:01:46 ACUS01 KWNS 140601 SWODY1 SPC AC 140600 Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0100 AM CDT Thu Mar 14 2024 Valid 141200Z - 151200Z ....THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS IN SOUTHEAST OK TO SOUTHERN MO... ....SUMMARY... Scattered severe thunderstorms capable of tornadoes, large to very large hail, and strong to locally severe wind gusts will be possible from parts of the south-central states into the Midwest. The most likely corridor for severe to occur is from southeast Oklahoma into northern Arkansas and southern Missouri during the afternoon and evening. ....Synopsis... A cutoff mid/upper low will evolve from the Great Basin into southern CA by early Friday, while a low-amplitude shortwave impulse over the central Great Plains gradually shifts towards the southern Great Lakes. Neutral to weak mid-level height rises should occur between these two waves across the south-central states. ....Northeast TX/eastern OK to the Mid-South... Despite the neutral to weakly rising mid-level heights, a difluent upper flow regime coupled with robust boundary-layer heating along/ahead of an initially slow-moving dryline/cold front should foster scattered early to mid-afternoon thunderstorm development from the Ozarks across eastern OK. Given robust buoyancy and moderate vertical shear, initial development will likely contain supercells capable of all severe hazards, including very large hail. Upscale growth into multiple linear clusters is expected in the late afternoon to early evening as convection becomes increasingly widespread. Still, semi-discrete convection should develop ahead of this activity within a modest low-level warm-advection regime. While low-level south-southwesterlies should not be uniform, and perhaps not overly strong across the warm sector, they should also strengthen somewhat into the early evening. This setup should foster an uptick in tornado potential as convection spreads across southeast OK to western/northern AR. In time, increasing alignment of the deep-layer shear vector with the expected MCS orientation should further yield a messy/complex convective mode evolution. Embedded supercells and localized bows will support sporadic occurrences for all hazards, although a general downward trend should gradually occur overnight as convection outpaces the surface-based instability plume in the TN Valley vicinity. ....Mid-MS Valley to OH... Showers and thunderstorms will likely be ongoing near the surface low and warm front later this morning. General expectation is for most of this activity to be north of the warm front, with an attendant threat for isolated hail. However, there is some potential for the southern edge of these storms, along associated outflow, to move within the far northern corridor of the warm sector, resulting in some threat for damaging gusts as well as hail. This activity is expected to continue eastward along the eastern periphery of the instability plume and reach the Mid to Upper OH Valley by afternoon. The presence of these early morning storms should modulate the effective frontal zone for potential mid to late afternoon redevelopment from the Mid-MS Valley towards parts of IN, as well as the degree of destabilization across the region. This lowers confidence in what otherwise appears to be a conditionally favorable setup for supercell clusters. The northeast extension of a steep mid-level lapse-rate plume, coupled with substantial deep-layer shear and hodograph enlargement, will favor risks for a few tornadoes and large to very large hail. For this cycle, have expanded the cat 2-SLGT risk substantially eastward with increased extent of the 5% tornado and sig severe hail areas. ...Grams/Thornton.. 03/14/2024 $$ = = = To unsubscribe from WX-STORM and you already have a login, go to https://lists.illinois.edu and use the "Unsubscribe" link. Otherwise email Chris Novy at cnovy@cox.net and ask to be removed from WX-STORM. --- SBBSecho 3.20-Linux * Origin: capitolcityonline.net * Telnet/SSH:2022/HTTP (1:2320/105) .