966  
ACUS02 KWNS 270654  
SWODY2  
SPC AC 270652  
 
DAY 2 CONVECTIVE OUTLOOK  
NWS STORM PREDICTION CENTER NORMAN OK  
1252 AM CST WED JAN 27 2021  
 
VALID 281200Z - 291200Z  
   
..NO THUNDERSTORM AREAS FORECAST
 
 
   
..SUMMARY
 
 
SEVERE WEATHER IS NOT EXPECTED ACROSS THE U.S. THURSDAY.  
   
..DISCUSSION
 
 
UPPER TROUGHING/CYCLONIC FLOW WILL PERSIST OVER THE NORTHEASTERN  
U.S. THURSDAY, AS ONE SHORTER-WAVELENGTH FEATURE SHIFTS EASTWARD  
INTO THE WESTERN ATLANTIC, TO BE REPLACED BY AN UPPER LOW  
PROGRESSING SOUTHEASTWARD OUT OF EASTERN CANADA INTO THE NORTHEAST.  
MEANWHILE IN THE WEST, A SHARP TROUGH JUST OFF THE WEST COAST WILL  
GRADUALLY ADVANCE INLAND THROUGH THE PERIOD. IN BETWEEN,  
ANTICYCLONIC FLOW WILL PREVAIL ACROSS A LARGE PORTION OF THE CENTRAL  
CONUS.  
 
AT THE SURFACE, HIGH PRESSURE WILL PREVAIL EAST OF THE ROCKIES,  
THOUGH A RATHER PRONOUNCED LEE TROUGH OVER THE HIGH PLAINS IS  
EXPECTED. MEANWHILE, A RATHER ILL-DEFINED COLD FRONT WILL MOVE  
ACROSS CALIFORNIA TOWARD THE GREAT BASIN AND DESERT SOUTHWEST.  
 
WITH MUCH OF THE COUNTRY UNDER THE INFLUENCE OF A CONTINENTAL POLAR  
AIRMASS, LITTLE CONVECTIVE POTENTIAL IS EVIDENT. ONE EXCEPTION WILL  
BE ACROSS PORTIONS OF THE WEST COAST STATES, AS THE UPPER TROUGH  
SHIFTS INLAND. IN ADDITION TO LOW-TOPPED SHOWERS, COLD AIR/STEEP  
LAPSE RATES ALOFT ACCOMPANYING THE TROUGH COULD SUPPORT A  
FEW/SPORADIC LIGHTNING FLASHES -- PARTICULARLY NEAR THE CENTRAL  
CALIFORNIA COAST LATE IN THE PERIOD. HOWEVER, COVERAGE AT THIS TIME  
APPEARS LIKELY TO REMAIN TOO SPARSE TO WARRANT INTRODUCTION OF A 10%  
THUNDER AREA.  
 
..GOSS.. 01/27/2021  
 

 
 
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