Subj : MESO: Mesoscale Discussion 2242 To : wx-storm@lists.illinois.edu From : COD Weather Processor Date : Mon Dec 01 2025 12:37:44 ACUS11 KWNS 011237 SWOMCD SPC MCD 011237=20 ARZ000-MOZ000-OKZ000-011700- Mesoscale Discussion 2242 NWS Storm Prediction Center Norman OK 0637 AM CST Mon Dec 01 2025 Areas affected...Northeast OK...western/central AR...far southwest MO Concerning...Winter mixed precipitation=20 Valid 011237Z - 011700Z SUMMARY...Freezing rain may increase across parts of central Arkansas this morning, while light mixed precipitation will continue to spread from northeast Oklahoma into northwest Arkansas and far southwest Missouri. DISCUSSION...Mixed precipitation (mainly in the form of shallow convective showers) has been spreading east-northeastward across central/eastern OK this morning. The 00Z OUN, 06Z LMN, and 12Z FWD soundings, along with recent objective mesoanalyses, suggest that a temperature inversion above 700 mb is limiting the depth of the convective showers, while dryness below 800 mb initially limited precipitation rates. However, the regenerative nature of this precipitation has resulted in evaporative moistening and cooling of the column, allowing for at least light accumulations of precipitation at the ground. Some icing has been noted in the OKC area, and light ice accretion and/or sleet accumulation may spread east-northeastward from northeast OK into northwest AR and far southwest MO. Some snow may mix with the precipitation in this area, though with the primary ascent and saturation occurring generally below the dendritic growth zone, a tendency toward sleet or freezing rain may persist in these areas as well.=20 Farther south, stronger buoyancy (as observed in the 12Z FWD sounding with MUCAPE above 100 J/kg) may support somewhat heavier precipitation rates from southwest into central AR later this morning, within a persistent low-level warm-advection regime. While low-level temperatures are more marginal compared to areas farther north, evaporative cooling and relatively dry/cold surface trajectories from the northeast may allow for some ice accretion, especially on elevated surfaces. A transition to primarily rain may occur from southwest to northeast by late morning, due to continued warm advection and muted diurnal heating. ...Dean.. 12/01/2025 ....Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!4x3U_D_RRiwpgCEMvwBjSRzjAKESpU4LXUemaSD0zcTYsIZcmGcUH4gPS8PTY3plS7n5F9K5a= zQMUbSCyY8rmyh7yzA$ for graphic product... ATTN...WFO...LZK...SGF...SHV...TSA... LAT...LON 35399566 35989597 36629598 36859458 36509267 35449188 34449201 33789247 33749316 34059431 34529443 35189452 35399566=20 =3D =3D =3D 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 3.28-Linux * Origin: capitolcityonline.net * Telnet/SSH:2022/HTTP (1:2320/105) .