SPC 1200Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1255 AM CDT Sun Mar 23 2025 Valid 231200Z - 241200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS EXTENDING FROM NORTHEAST TEXAS ACROSS THE LOWER MISSISSIPPI VALLEY AND INTO WESTERN TENNESSEE... ...SUMMARY... Scattered severe thunderstorms are possible this afternoon and evening from East Texas into the Lower Mississippi and Tennessee Valleys. Large hail and damaging gusts will be the main hazards. ...Synopsis... A shortwave trough will take on a negative tilt and deepen as it moves from the northern Plains toward the upper Great Lakes, with increasing mid and high level winds into the OH and TN Valleys. At the surface, low pressure will deepen from WI into Lower MI with a cold front extending south across the mid MS and toward the ArkLaTex by afternoon. Heating and destabilization will be most prominent roughly from Memphis TN southwestward into TX with dewpoints into the mid 60s F, with moderate deep-layer shear across the entire frontal zone. ...Lower OH Valley southwestward into eastern TX... Early day rain and storms will likely be ongoing over MO, with activity spreading east across KY. Weak elevated instability will fuel this activity, supported by a 50+ kt low-level jet. Isolated strong gusts may occur. In the wake of the early activity, destabilization will occur ahead of the front, with 1000 J/kg MLCAPE as far north as the MO Bootheel. Stronger instability will develop across AR, western MS and into TX with over 2000 J/kg MUCAPE possible. Given peak heating and deepening moist boundary layer, scattered storms are likely along the length of the front. Initial vigorous activity is likely to produce large hail perhaps over 1.75". Low-level SRH may favor a few supercells over parts of AR/LA/MS, and a brief tornado may occur. The line of storms is likely to persist for much of the evening as it shifts into northern AL and central MS. ..Jewell/Lyons.. 03/23/2025