788  
ACUS03 KWNS 300512  
SWODY3  
SPC AC 300510  
 
DAY 3 CONVECTIVE OUTLOOK  
NWS STORM PREDICTION CENTER NORMAN OK  
1110 PM CST WED NOV 29 2017  
 
VALID 021200Z - 031200Z  
   
..NO SEVERE THUNDERSTORM AREAS FORECAST
 
 
   
..SUMMARY
 
 
A FEW THUNDERSTORMS ARE POSSIBLE ACROSS WESTERN WASHINGTON AND  
OREGON ON SATURDAY.  
   
..SYNOPSIS AND DISCUSSION
 
 
A SHORTWAVE TROUGH WITH COLD TEMPERATURES ALOFT AND A COLD FRONT  
WILL MOVE EASTWARD ACROSS THE NORTHWESTERN STATES ON SATURDAY. THE  
PRESENCE OF STEEP LAPSE RATES ALOFT MAY SUPPORT SCATTERED SHOWERS, A  
FEW OF WHICH COULD PRODUCE LIGHTNING, ALONG THE WA/OR COASTS DURING  
THE DAY. INSTABILITY LEVELS EAST OF THE CASCADES APPEAR TOO WEAK FOR  
ANY APPRECIABLE THUNDERSTORM THREAT.  
 
ELSEWHERE, A MOISTENING AIR MASS WILL APPROACH THE TEXAS COAST LATE  
IN THE PERIOD WITH MID TO UPPER 60S DEWPOINTS, AS A WEAK  
LOW-LATITUDE WAVE PROVIDES COOL TEMPERATURES ALOFT. HOWEVER, ANY  
WEAK INSTABILITY WILL REMAIN CAPPED, WITH THUNDERSTORMS UNLIKELY. A  
LARGE SURFACE HIGH WILL THEN MAINTAIN STABLE CONDITIONS ACROSS THE  
REMAINDER OF THE EASTERN CONUS.  
 
..JEWELL.. 11/30/2017  
 

 
 
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