155  
ACUS03 KWNS 090749  
SWODY3  
SPC AC 090748  
 
DAY 3 CONVECTIVE OUTLOOK  
NWS STORM PREDICTION CENTER NORMAN OK  
0148 AM CST THU NOV 09 2017  
 
VALID 111200Z - 121200Z  
   
..NO SEVERE THUNDERSTORM AREAS FORECAST
 
 
   
..SUMMARY
 
 
SEVERE THUNDERSTORMS ARE NOT EXPECTED ACROSS THE U.S. ON SATURDAY.  
   
..SYNOPSIS
 
 
LOW-AMPLITUDE/ZONAL FLOW ALOFT IS FORECAST TO PERSIST ACROSS THE  
U.S. FOR MUCH OF DAY 3/SATURDAY, THOUGH SOME PATTERN AMPLIFICATION  
IS PROGGED DURING THE SECOND HALF OF THE PERIOD AS AN UPPER LOW  
EVOLVES OFF THE PACIFIC NORTHWEST COAST. AS THIS OCCURS, DOWNSTREAM  
RIDGING WILL STRENGTHEN A BIT, IN THE WAKE OF A SHORT-WAVE TROUGH  
CROSSING THE ROCKIES AND EVENTUALLY EMERGING INTO THE NORTHERN AND  
CENTRAL PLAINS.  
 
AT THE SURFACE, HIGH PRESSURE WILL LARGELY PREVAIL, THOUGH A WEAK  
INVERTED TROUGH OVER THE SOUTHERN PLAINS MAY EVOLVE LATER IN THE  
PERIOD IN RESPONSE TO THE UPPER SYSTEM TRAVERSING THE WEST. SHOWERS  
WILL BE POSSIBLE IN A FEW PORTIONS OF THE INTERMOUNTAIN WEST AS THE  
TROUGH ADVANCES, THOUGH AT THIS TIME ANY RISK FOR LIGHTNING APPEARS  
LOW. THE AREA OF GREATEST LIGHTNING POTENTIAL APPEARS TO BE  
PORTIONS OF THE FLORIDA PENINSULA ONCE AGAIN, WHERE EASTERLY ONSHORE  
POST-FRONTAL FLOW SHOULD SUPPORT AMPLE CONVERGENCE NEAR EAST-COAST  
SEA-BREEZE BOUNDARIES TO SUPPORT AFTERNOON CONVECTION. A FEW  
THUNDERSTORMS MAY EVOLVE, BUT SEVERE WEATHER IS NOT EXPECTED.  
 
..GOSS.. 11/09/2017  
 

 
 
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