SPC 0830Z Day 3 Outlook
Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0131 AM CST Wed Dec 09 2020 Valid 111200Z - 121200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Isolated to scattered thunderstorms are possible Friday across portions of the south-central U.S. ...Synopsis... A large-scale upper trough over the western U.S. will deepen and slowly shift eastward to the Plains by Saturday morning. A lead shortwave impulse over the central/southern High Plains Friday morning will eject east/northeast across the mid/lower MS Valley, weakening with time. At the surface, a weak low/baroclinic zone will extend from the Ozarks through eastern OK and into central TX during the afternoon. Southerly low level flow will allow Gulf moisture to spread northward across the south-central U.S., with the higher surface dewpoints being confined to the TX Gulf Coast and southwest LA. 60s F dewpoints may make it as far north as southern AR late Friday night/Saturday morning, but overall, the boundary layer will remain shallow and moisture return of poor-quality given recent cold fronts developing far into the southern Gulf of Mexico/Yucatan region. Nevertheless, strong ascent will spread over the southern Plains to the lower/mid MS Valley vicinity and modest elevated instability is forecast. Isolated thunderstorms are expected in this warm advection regime ahead of a southeastward-advancing cold front, but severe potential is not expected. ..Leitman.. 12/09/2020
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