SPC 1200Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1245 AM CDT Sun Apr 13 2025 Valid 131200Z - 141200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Thunderstorm development will be possible on Sunday from the upper Mississippi Valley into the Great Lakes, and from the Intermountain West to the central High Plains. No severe threat is expected. ...DISCUSSION... At mid-levels, a ridge will move through the Great Lakes and lower to mid Mississippi Valley, as a shortwave trough moves through the northern High Plains. At the surface, a low will move into the mid Missouri Valley as a cold front advances southeastward through the central Plains. Head of the front, an axis of low-level moisture will be in place from the Ozarks northward into Minnesota. Surface dewpoints are expected to be in the 40s F over the upper Mississippi Valley, where weak destabilization is expected. Along the northern part of the instability axis, isolated thunderstorm development will be possible during the day in parts of south-central Minnesota and western Wisconsin. In this area, instability will be elevated and mid-level lapse rates will be steep, suggesting that small hail will be possible with the stronger cells. Elsewhere, isolated to scattered thunderstorms, sub-severe in nature, are expected this afternoon from parts of eastern Utah eastward into the central High Plains. ..Broyles/Wendt.. 04/13/2025
