218  
ACUS01 KWNS 020508  
SWODY1  
SPC AC 020506  
 
DAY 1 CONVECTIVE OUTLOOK  
NWS STORM PREDICTION CENTER NORMAN OK  
1106 PM CST FRI DEC 01 2017  
 
VALID 021200Z - 031200Z  
   
..NO SEVERE THUNDERSTORM AREAS FORECAST
 
 
   
..SUMMARY
 
 
ISOLATED THUNDERSTORMS ARE POSSIBLE ACROSS THE COASTAL PACIFIC  
NORTHWEST TODAY.  
   
..SYNOPSIS
 
 
INITIALLY ZONAL UPPER PATTERN IS EXPECTED TO BEGIN AMPLIFYING DURING  
THE SECOND HALF OF THE PERIOD AS A STRONG SHORTWAVE TROUGH MOVES  
THROUGH THE PACIFIC NORTHWEST. SOME MODEST RIDGING IS POSSIBLE  
ACROSS THE PLAINS IN RESPONSE TO THE PROGRESSION OF THIS SHORTWAVE.  
BEST CHANCE FOR ISOLATED THUNDERSTORMS WILL EXIST ALONG THE  
IMMEDIATE COAST OF THE PACIFIC NORTHWEST AFTER 00Z AS THE COLD POOL  
ALOFT MOVES OVER THE REGION AND FORCING FOR ASCENT PERSISTS.  
 
FARTHER SOUTH, A SHORTWAVE TROUGH IS EXPECTED TO MOVE ACROSS  
NORTHERN MEXICO AND EMERGE OVER WEST TEXAS LATE IN THE PERIOD.  
INCREASED MID-LEVEL MOISTURE WILL FAVOR THE DEVELOPMENT OF SHOWERS  
OVER WEST TEXAS AND THERE IS SOME POTENTIAL FOR AN ISOLATED  
LIGHTNING STRIKE OR TWO. HOWEVER, INSTABILITY WILL BE VERY LIMITED  
AND THE CURRENT EXPECTATION IS FOR LIGHTNING COVERAGE TO REMAIN  
BELOW 10%.  
 
..MOSIER/GLEASON.. 12/02/2017  
 

 
 
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