Severe Weather Threat Day 1 Sun Dec 30

As An Upper Low Initially Centered Just Off The Me Coast Moves Newd Away From New England...Ridging Will Spread Across The Central And Ern U.S. Ahead Of A Second Trough Progged To Advance Across The Wrn States. This Trough Is Forecast To Dig Sewd Across The Great Basin Toward The Desert Sw Through The First Half Of The Period...And Then Should Make A Turn Ewd Into The Srn Rockies Late.

At The Surface...A Cold Front Is Forecast To Cross The Nrn And
Central Plains...As The Srn Fringe Of A Progressive Canadian Upper
System Brushes The N Central Conus. Meanwhile...A Weak Surface
Cyclone Is Expected To Move Slowly Ewd Across The Srn Rockies Ahead Of The Swrn U.S. Upper System. While Sly Surface Flow Ahead Of This Low Will Evolve Across The Srn Plains...Allowing Some Return Of Low-Level Moisture Across S Tx...Any Decrease In The Stability Of The Airmass Across Tx Should Remain Insufficient To Support Deep Moist Convection.

An Isolated Strike Or Two Could Accompany The Upper System As It
Crosses The Srn Rockies/Desert Sw...However Any Coverage Should
Remain Insufficient To Support Introduction Of A 10% Thunder Area.


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