587  
FXUS01 KWBC 081919  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
318 PM EDT SAT SEP 08 2018  
 
VALID 00Z SUN SEP 09 2018 - 00Z TUE SEP 11 2018  
 
...HEAVY TO EXCESSIVE RAINFALL WILL CONTINUE ACROSS THE OHIO  
VALLEY AND INTO PARTS OF THE NORTHEAST THIS WEEKEND...  
 
...ADDITIONAL HEAVY RAINFALL POSSIBLE FROM CENTRAL TEXAS INTO THE  
LOWER MISSISSIPPI VALLEY...  
 
THE LOW PRESSURE CENTER THAT ONCE WAS TROPICAL DEPRESSION GORDON  
HAS BEEN ABSORBED INTO A FRONTAL SYSTEM AND HAS BECOME  
EXTRATROPICAL. REGARDLESS THOUGH, DEEP TROPICAL MOISTURE WILL  
CONTINUE TO INTERSECT THIS SYSTEM TO PRODUCE HEAVY RAINFALL AND  
THE THREAT FOR SIGNIFICANT FLOODING ACROSS PARTS OF THE OHIO  
VALLEY, WHERE WPC CURRENTLY HAS A MODERATE TO HIGH RISK FOR  
EXCESSIVE RAINFALL/FLASH FLOODING EFFECTIVE THROUGH TONIGHT, WITH  
A MODERATE RISK CONTINUING INTO THE EASTERN OHIO VALLEY/LOWER  
GREAT LAKES TOMORROW. HEAVY RAINFALL WILL ALSO BE POSSIBLE FARTHER  
EAST INTO THE MID-ATLANTIC AND THE NORTHEAST AS THIS SYSTEM  
CONTINUES TO TRACK NORTHEASTWARD THROUGH THE WEEKEND. THESE  
REGIONS HAVE BEEN HIGHLIGHTED WITHIN A SLIGHT RISK ON THE DAYS 2  
AND 3 WPC EXCESSIVE RAINFALL OUTLOOKS.  
 
FARTHER SOUTH, THE TRAILING COLD FRONT WILL ALLOW FOR ORGANIZED  
SHOWERS AND THUNDERSTORMS FROM PARTS OF THE SOUTHERN PLAINS TO THE  
TENNESSEE VALLEY AS WELL, WHERE WPC HAS HIGHLIGHTED MUCH OF THIS  
AREA IN A SLIGHT RISK FOR EXCESSIVE RAINFALL AS WELL THROUGH  
SATURDAY. BEHIND THIS SYSTEM, COLD AIR HAS BEGUN FILTERING INTO  
THE CENTRAL U.S. WHERE TEMPERATURES COULD BE AS MUCH AS 10 TO 15  
DEGREES BELOW NORMAL THROUGH THE WEEKEND. EXPECT COLDER THAN  
NORMAL TEMPS TO THE NORTH OF THE QUASI-STATIONARY BOUNDARY IN THE  
MID-ATLANTIC WHERE A HANDFUL OF RECORD LOW MAXIMUMS ARE POSSIBLE.  
 
ELSEWHERE ACROSS THE COUNTRY, LINGERING MOISTURE AHEAD OF THIS  
MAIN FRONTAL SYSTEM WILL KEEP SCATTERED SHOWERS AND STORMS ACROSS  
THE SOUTHEASTERN STATES, WHILE ANOTHER FRONTAL BOUNDARY CROSSING  
THE NORTHERN PLAINS SUNDAY INTO MONDAY MAY BRING A FEW SHOWERS AND  
THUNDERSTORMS TO THE DAKOTAS AND INTO THE UPPER MISSISSIPPI  
VALLEY. A DEEP UPPER LEVEL LOW LINGERING JUST OFF THE BRITISH  
COLUMBIA COAST MAY ALSO ALLOW FOR LIGHT TO MODERATE SHOWERS ACROSS  
PARTS OF THE PACIFIC NORTHWEST THROUGH MONDAY.  
 
SANTORELLI  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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