620  
FXUS01 KWBC 180758  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
358 AM EDT FRI MAY 18 2018  
 
VALID 12Z FRI MAY 18 2018 - 12Z SUN MAY 20 2018  
 
...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS OVER PARTS OF  
THE CENTRAL/SOUTHERN PLAINS...  
 
...HEAVY RAIN POSSIBLE OVER PARTS OF THE CENTRAL PLAINS AND OVER  
THE MID-ATLANTIC SOUTHWARD TO THE SOUTHEAST...  
 
...TEMPERATURES WILL BE 10 TO 20 DEGREES BELOW AVERAGE OVER PARTS  
OF THE NORTHERN HIGH PLAINS...  
 
UPPER-LEVEL ENERGY OVER THE MIDDLE/LOWER MISSISSIPPI VALLEY WILL  
SLOWLY MOVE NORTHEASTWARD TO THE OHIO VALLEY WHILE WEAKENING BY  
SATURDAY EVENING. THE SYSTEM WILL PRODUCE RAIN AND THUNDERSTORMS  
OVER PARTS OF THE LOWER/MIDDLE MISSISSIPPI VALLEY EASTWARD TO THE  
MID-ATLANTIC AND THE SOUTHEAST THAT WILL MOVE NORTHWARD INTO THE  
GREAT LAKES/NORTHEAST WHILE CONTINUING OVER OHIO  
VALLEY/MID-ATLANTIC AND THE SOUTHEAST THROUGH SATURDAY EVENING  
INTO SUNDAY.  
 
MEANWHILE, A SECOND AREA OF UPPER-LEVEL ENERGY AND ASSOCIATED DEEP  
UPPER-LEVEL TROUGH OVER THE GREAT BASIN INTO THE NORTHERN PLAINS  
WILL PRODUCE A REGION OVER RAIN AND THUNDERSTORMS OVER PARTS OF  
THE NORTHERN HIGH PLAINS INTO PARTS OF THE NORTHERN/CENTRAL PLAINS  
AND THE UPPER MISSISSIPPI VALLEY WILL CONTINUE OVER PARTS OF THE  
REGION THROUGH SATURDAY EVENING. IN ADDITION, DIURNAL HEATING  
WILL AID IN PRODUCING SHOWERS AND THUNDERSTORMS OVER PARTS OF THE  
SOUTHERN/CENTRAL HIGH PLAINS DURING THE LATE AFTERNOON INTO LATE  
EVENING ON FRIDAY AND SATURDAY.  
 
ZIEGENFELDER  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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