193
ACUS01 KWNS 050055
SWODY1
SPC AC 050053
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0653 PM CST SUN JAN 04 2026
VALID 050100Z - 051200Z
..NO SEVERE THUNDERSTORM AREAS FORECAST
..SUMMARY
THE RISK FOR THUNDERSTORMS WILL REMAIN GENERALLY LOW ACROSS THE U.S.
THROUGH TONIGHT.
..DISCUSSION
COLD MID-LEVEL AIR OVERSPREADING THE PACIFIC COAST INTO
INTERMOUNTAIN WEST, ASSOCIATED WITH SPLITTING LARGE-SCALE MID/UPPER
TROUGHING, HAS CONTRIBUTED TO WEAK CONDITIONAL INSTABILITY, BASED ON
OBSERVED AND FORECAST SOUNDINGS. THERMODYNAMIC PROFILES APPEAR TO
HAVE BECOME AT LEAST POTENTIALLY MARGINALLY CONDUCIVE TO CONVECTION
CAPABLE OF PRODUCING LIGHTNING IN A BROAD SWATH, ACROSS NORTHERN AND
CENTRAL CALIFORNIA THROUGH THE NORTHERN INTERMOUNTAIN REGION AND
GREAT BASIN, AS WELL AS ACROSS THE PACIFIC NORTHWEST.
DESPITE THIS DESTABILIZATION, TO THIS POINT, WEAK THUNDERSTORM
DEVELOPMENT HAS BEEN GENERALLY NEGLIGIBLE. WITH THE ONSET OF
DIURNAL BOUNDARY-LAYER COOLING, THIS MAY NOT CHANGE APPRECIABLY THIS
EVENING INTO THE OVERNIGHT HOURS.
HOWEVER, WITH THE MID-LEVEL COLD CORE OF ONE NOTABLE SHORT WAVE
PERTURBATION JUST NOW BEGINNING TO SPREAD INLAND OF WASHINGTON AND
ADJACENT OREGON COASTAL AREAS, MID-LEVEL FORCING FOR ASCENT AND
COOLING MIGHT STILL INCREASE SUFFICIENTLY TO SUPPORT MINIMUM
THRESHOLD THUNDERSTORM PROBABILITIES TONIGHT.
ACROSS PARTS OF THE SOUTHERN SIERRA NEVADA INTO GREAT BASIN, FORCING
FOR ASCENT ASSOCIATED WITH A MORE MODEST AND WEAKENING SHORT WAVE
PERTURBATION COULD ALSO STILL SUPPORT MINIMUM THRESHOLD THUNDERSTORM
PROBABILITIES.
..KERR.. 01/05/2026
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