415
ACUS48 KWNS 210921
SWOD48
SPC AC 210920
DAY 4-8 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0320 AM CST SUN DEC 21 2025
VALID 241200Z - 291200Z
..DISCUSSION
MEDIUM-RANGE MODEL GUIDANCE INITIALLY SHOWS A PATTERN FEATURING AN
UPPER RIDGE OVER THE CENTRAL CONUS AND TROUGH ALONG THE WEST COAST,
TRANSITIONING TO A MORE PROGRESSIVE FLOW REGIME AND LOWERING HEIGHTS
ACROSS THE GREAT PLAINS DURING THE THURSDAY-SATURDAY (D5-D7) PERIOD.
THE INLAND-MOVING WEST COAST TROUGH WILL POTENTIALLY YIELD ISOLATED
TO SCATTERED THUNDERSTORMS ON WEDNESDAY INTO EARLY THURSDAY OVER
PORTIONS OF SOUTHERN AND CENTRAL CA AND PERHAPS A LOCALIZED RISK FOR
A COUPLE OF STRONGER THUNDERSTORMS. DETAILS CONCERNING THIS
CONVECTIVE SCENARIO AND OVERALL MAGNITUDE OF SEVERE RISK PRECLUDE
SEVERE HIGHLIGHTS. FARTHER EAST, SOME MOISTURE RETURN NORTHWARD
INTO THE SOUTHERN GREAT PLAINS AND MS VALLEY THROUGH FRIDAY WILL
LIKELY BE MODULATED BY FRONTAL ADVANCEMENTS DURING THE LATTER PART
OF EXTENDED PERIOD.
..SMITH.. 12/21/2025
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