SPC 2000Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0136 PM CST Sat Jan 04 2025 Valid 042000Z - 051200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Isolated thunderstorms remain possible late tonight into early Sunday morning from parts of the southern/central Plains eastward to the Mid-South. Severe thunderstorms are not expected. ...20Z Update... A pronounced mid-level trough continues to amplify while traversing the Inter-mountain West, supporting a gradual increase in the strength of a low-level jet, which is currently positioned over the Plains states. Objective analysis shows richer low-level moisture over TX, which is poised to reach the central Plains/MS Valley regions later tonight into early Sunday morning. As such, the previous forecast (see below) remains on track, as elevated thunderstorms should initiate within a low-level warm-air/moisture advection regime. ..Squitieri.. 01/04/2025 .PREV DISCUSSION... /ISSUED 1019 AM CST Sat Jan 04 2025/ ...KS to the Ozarks/Mid-South overnight... In response to southern High Plains lee cyclogenesis, a modifying air mass (boundary-layer dewpoints in the mid 60s) is returning northward from the western Gulf of Mexico to the TX coast. This moisture will continue spreading northward through tonight as a midlevel shortwave trough over UT progresses eastward to the High Plains. Low-midlevel ascent will gradually increase within a strengthening and increasingly moist warm advection regime, especially in the corridor from southern KS to northern AR/southern MO tonight. Elevated thunderstorms will become more probable after 06z, and freezing rain/sleet with thunder will be possible from KS into west central MO. Farther south, isolated thunderstorms may also spread into southern LA prior to 12z, along the north edge of richer near-surface moisture, and east of the more prominent midlevel cap over TX.