393  
FXUS01 KWBC 210648  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
247 AM EDT FRI SEP 21 2018  
 
VALID 12Z FRI SEP 21 2018 - 12Z SUN SEP 23 2018  
 
...HEAVY RAIN EXPECTED FOR THE SOUTHERN PLAINS AND MUCH COOLER  
WEATHER FOR THE NORTHERN TIER STATES...  
 
HEAVY RAIN AND FLOODING ARE EXPECTED TO MAKE WEATHER HEADLINES FOR  
THE END OF THE WEEK ACROSS PARTS OF TEXAS, OKLAHOMA, AND ARKANSAS.  
A DEEP SURGE OF TROPICAL MOISTURE, WITH MUCH OF THIS FROM FORMER  
TROPICAL DEPRESSION NINETEEN, WILL ADVECT NORTHWARD AND BE LIFTED  
BY A COLD FRONT APPROACHING FROM THE CENTRAL PLAINS AND FURTHER  
AIDED BY A SHORTWAVE ARRIVING FROM THE SOUTHERN ROCKIES. WPC  
CURRENTLY HAS A MODERATE RISK OF EXCESSIVE RAINFALL FROM  
NORTH-CENTRAL TEXAS TO SOUTHERN OKLAHOMA FOR THE POTENTIAL FOR  
SEVERAL INCHES OF RAIN THROUGH SATURDAY AFTERNOON, AND HIGH  
RAINFALL RATES WILL LIKELY LEAD TO INSTANCES OF FLASH FLOODING  
OVER THIS REGION.  
 
OTHER AREAS THAT WILL LIKELY HAVE ENHANCED RAINFALL ARE PARTS OF  
WESTERN WASHINGTON STATE AND THE UPPER MIDWEST. A PACIFIC LOW  
PRESSURE SYSTEM IS FORECAST TO REACH SOUTHERN BRITISH COLUMBIA  
FRIDAY NIGHT WITH A PLUME OF HEAVY SHOWERS AHEAD OF IT THAT WOULD  
AFFECT THE GREATER SEATTLE AREA AND MAINLY POINTS NORTH AND WEST.  
THE RAPIDLY DEVELOPING SURFACE LOW OVER THE GREAT LAKES REGION  
EARLY FRIDAY WILL ALSO RESULT IN WIDESPREAD RAIN FROM NORTHERN  
MINNESOTA TO THE UPPER PENINSULA OF MICHIGAN, AND THUNDERSTORMS  
EXTENDING FROM CENTRAL MICHIGAN TO THE GULF COAST. WINDY  
CONDITIONS ARE EXPECTED ACROSS THE GREAT LAKES REGION ON FRIDAY  
OWING TO THE INCREASING PRESSURE GRADIENT FROM THE STRONG SURFACE  
LOW.  
 
TEMPERATURES ARE EXPECTED TO BE BELOW NORMAL ACROSS THE  
NORTH-CENTRAL U.S. ON FRIDAY BEHIND THE STRONG COLD FRONT, WITH  
READINGS ONLY REACHING THE 50S FROM MONTANA TO WISCONSIN WITH  
AUTUMN MAKING ITS PRESENCE KNOWN. IT'S STILL SUMMER-LIKE ACROSS  
THE DEEP SOUTH AND EXTENDING EASTWARD TO THE SOUTHEAST COAST WITH  
HIGHS IN THE UPPER 80S AND LOWER 90S WITH HIGH HUMIDITY AS THE  
UPPER LEVEL RIDGE CONTINUES TO GOVERN THE WEATHER PATTERN.  
 
D. HAMRICK  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
CLICK HERE TO GO TO PREVIOUS BULLETINS.

The Nexlab HPC Page Main Text Page