SPC 0830Z Day 3 Outlook
Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0204 AM CST Tue Dec 10 2024 Valid 121200Z - 131200Z ...NO THUNDERSTORM AREAS FORECAST... ...SUMMARY... Thunderstorms are not expected on Thursday. ...Synopsis... A mid/upper cyclone is forecast to be over the Ontario/Quebec vicinity early Thursday morning, with cyclonic flow throughout its base extending from the northern/central Plains through the Northeast. This cyclone is expected to gradually shift eastward through Quebec, with the associated cyclonic flow shifting northward and eastward as well. Farther west, a low-amplitude shortwave trough is expected to progress across the Great Basin into the Four Corners region while enhanced mid-level westerly flow associated with it spreads from southern CA across the Southwest. At the surface, extensive ridging is expected from the northern Plains into much of the eastern CONUS, promoting dry and stable conditions. Modest lee troughing is anticipated across the High Plains ahead of the approaching shortwave. However, scouring of the low-level moisture by an antecedent frontal passage will limit moisture advection, with stable conditions prevailing across the central and southern Plains as well. ..Mosier.. 12/10/2024