SPC 0730Z Day 3 Outlook
Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0229 AM CDT Mon Oct 20 2025 Valid 221200Z - 231200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Severe storms are unlikely over the CONUS Wednesday. ...Synopsis and Discussion... A strong and broad upper low will dominate the mid-level flow pattern over the eastern half of the CONUS as it moves slowly from the Great Lakes into southern Canada Wednesday. Behind it, strong northwesterly flow aloft and weak ridging will then develop over the central US as a surface cold front moves off the Atlantic coast. The offshore flow should keep dry and stable conditions in place for much of the country with the exception of south Florida and parts of New England. Shallow moisture associated with remnant onshore flow east of the upper low across New England could support isolated low-topped storms Wednesday afternoon. However, buoyancy will be very weak, and storm coverage limited, such that severe potential is low. To the west, a smaller southern stream upper low will move onshore from the Pacific into the Southwest late Wednesday afternoon into early Thursday. Cooling mid-level temperatures and weak moisture advection from the Gulf of California could support isolated storms over the Four Corners and southern Rockies. Though with weak buoyancy severe potential appears very limited. ..Lyons.. 10/20/2025
