SPC 1930Z Day 3 Outlook
Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0210 PM CDT Sun Oct 19 2025 Valid 211200Z - 221200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Isolated thunderstorms are possible over the Great Lakes, South Florida, and the northwest Gulf Coast regions Tuesday. Severe thunderstorms are not expected. ...Synopsis... A broad upper trough will envelop much of the eastern half of the CONUS on Tuesday. A surface low will migrate across the Great Lakes, with a trailing cold front developing southeast across TX and the much of the Southeast and Eastern Seaboard. Rich boundary layer moisture across coastal TX into LA will be in place ahead of the front, aiding in weak to moderate destabilization through peak heating. Stronger large-scale ascent will be focused well to the northeast, but ascent along the front may support isolated thunderstorms. Vertical shear will generally be weak, but a couple of stronger storms could produce gusty winds. More robust updrafts will likely be limited by poor midlevel lapse rates/warm midlevel temps. Additional isolated thunderstorms will be possible across parts of the Great Lakes and upper Ohio Valley beneath the cold core of the upper low/trough, and across south FL within a moist and unstable environment. Severe storms are not expected. ..Leitman.. 10/19/2025
